Contents FeatureS 1... .... cee eee eee 1 Applications ..............0-00% 1 Block Diagram ..............4.4- 1 Selection Guide ................ 2 Pin Arrangement ............-.- 2 Absolute Maximum Ratings ....... 3 Electrical Characteristics ......... 3 Test Circuits ...............04. 8 Operation ........... ee eee eee 9 External Part Selection Guidelines .. 12 Standard Circuit ................ 14 Precautions ..............0000- 14 Physical Dimensions ............ 15 MarkingS .............00 eee eee 15 Taping ......... eee ee eee eee 16 Characteristics (typical data) ...... 18 Reference Data ...............6. 19PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series The 8310/8311 Series includes a CMOS PWM step-up switching regulator that consists of a reference voltage source, a CR oscillation circuit, a power MOS FET and two voltage detectors. Output voltage is fixed internally and a shutdown function is available. Current consumption is drastically reduced because of the CMOS configuration. The 8310/8311 Series offers low voltage operation. The S-8310 Series easily forms a step-up switching regulator by. attaching only a coil, a diode and capacitors externally. The S-8311 Series has a function of input voltage clamp. Both series are suitable for use as power sources for portable devices. WM Features HM Applications Low voltage operation: 0.9 V min. Low current consumption: 23 uA typ. (S-8310AFE, ISS) High-precision output voltage: + 2.4% Shutdown function * Two voltage detectors Internal switching current limit circuit * Adjustable voltage clamp circuit (S-8311) SOP-8, SSOP-16 package M Block Diagram Power supplies for portable equipment such as pagers, handy calculators, and remote controllers Constant voltage power supplies for cameras, video equipment, and communications equipment Power supply for microcomputers (1) S-8310 Series (2) S-8311 Series Spi V, St Vee CONT DN fe T Vout P * YP ye STEP-UP Ye vd1 VD out | | > SENSE, * 5 STEP-UP vo1 VD lout > vo2* o2our P Vin SENSE $ vD2* V S VD2ouT BASE , +t SENViy > f > ~V ss ar SENGND * The two voltage detectors have Nch open-drain. * P means a power line. Figure1 Block Diagram Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series ME Selection Guide 1. Name of the Product S-831 XXFX - T2 Tape Specification E: 8-pinSOP S: 16-pin SSOP Abbreviation 2. List of the Product Function 0: Without a voltage clamp circuit 1: With a voltage clamp circuit . tecti Item Output Voltage (V) Detection Voltage Detection Voltage Name VD1 (Vv) VD2 (V) $-8310AFE 3.00 2.20 0.90 S-8310BFE 2.50 2.20 0.80 $-8310CFE 3.00 2.20 1.10 $-83 10DFE 2.70 2.20 1.00 S-8311AFS 2.00 1.90 0.95 Note 1: Voltage values shown above are typical. Note 2: For other values, contact SIls or SIUs IC Sales Dept. BH Pin Assignment 8-pin SOP 16-pin SSOP Top view Top view oi ~~ gp 1 F] cx 2 7p ; = m3 6 4 J m4 Sto 5 a 6 r 7 CJ 8 al Figure 2 Pinname | $-8310 | $-8311 Functions CONT 8 16 External inductor connection terminal Vss5 1 1 GND terminal SD1 2 3 Shutdown terminal for Step-up H": Operation L: Step-up stop Ves 13 Feedback voltage terminal for step-up Vout 7 14 Positive power terminal for voltage detectors, step-up and clamp circuit VDitour 5 9 Output terminal for VD1 SENSE 3 6 Sensing terminal for Voltage Detector 2 (VD2) VD2o0ut 4 7 Output terminal for VD2 Vin _ 12 Sensing terminal for clamp circuit Vease - 10 External transistor connection terminal SENViw - 11 Sensing terminal for primary battery $D2 _ 4 Shutdown terminal for voltage clamp H": Clamp operation L": Stop SENGND _ 5 External resistors connection terminal Note: Inthe $-8311 Series, pin Nos. 2, 8, and 15 are NC. Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series M@ Absolute Maximum Ratings (Unless otherwise specified Ta = 25C) Parameter Symbol Ratings Unit SENSE, CONT Vout, Vease ' Vs5 ~ 0. 1 Vv Input voltage SENViy ,SENGND SD1 ,5D2, Veg ss~ 0.310 10 Output voltage of _ vD1 and VD2 VD1our , VD2our Vs5 - 0.3 to 10 Vv Supply voltage Vin Vs5 - 0.3 to 10 Vv Power dissipation Pp 300 mW Operating temperature Topr -40to +85 C Storage temperature Tstg -40to +125 C HM Electrical Characteristics 1. S-8310AFE (Unless otherwise specified Ta = 25C) Parameter Symbol Conditions Min. Typ. | Max. { Unit. | Test Current consumption ss Vout = 2.85V', sp" = Vout 23 38 pA 1 Ist Vout = 2.85V ,5D1=GND 2.1 4 Output voltage Vout Vin = 1.5V, lout = 10mMA 2.928 3 3.072 Start-up voltage Vst RL=Vout/imA, Vix voltage _ _ 0.9 Vv Retention voltage Vhid Re = Vout/1mA, Vin voltage 0.7 _ _ Line regulation AVourVin) | Vin = 1.5~2.0V, loys = 10mMA ~ 2 20 mV 2 Load regulation AVourlou) | Vin = 1-5Viloyr= 10xA~15mA | 2 25 Output voltage AVour /ATa | Ta =-40 to + 85C _ 0.31 | 1.31 | mV/PC temperature coefficient Oscillating frequency fosc Vout =3V, FB=GND 40 50 60 KHz Maximum duty ratio maxduty | Voy7 = 3V, FB= GND 65 75 85 % Shutdown terminal input Vs Operation 2.1 _ 8 3 voltage Ve. Shut down V503V | | 0.75 V Leakage current Hek CONT = 8V, SDi=GND = 1.0 pA 4 Switch current Isw CONT =0.5V 120 170 _ mA _ VD1 Detection voltage -VDET1 2.147 2.2 2.253 Vv Hysteresis width of VD1 hys1 3 4.5 6 % 5 VD1 Detection voltage A-vdeT1 =| Ta=-40 to + 85C _ +0.23 | 0.96 | mV/C temperature coefficient /ATa VD1 Output current (Nch) | isINK1. | Voyr = 1.3V, VD lout = 0.5V 900 | BA Operating voltage of VD1 Vdd $Di=GND 0.7 8 V VD2 Detection voltage -VDET2 Vout =3V 0.878 | 0.900 | 0.922 Hysteresis width of VD2 hys2 Vout = 3V 2 10 % 7 VD2 Detection voltage A-VDET2. | Ta=-40 to + 85C _ +0.09 | +0.39 | mV/C temperature coefficient ldta / VD2 Output current ISINK2 Vout = 1.3V, VD2ouT = 0.5V 900 _ _ pA 8 (Nch) SENSE = GND Operating voltage of VD2 vdd2 $D1=GND 1.3 _ 8 v 7 Coil; CD54 (220 nH) by Sumida Electric Co., Ltd. Diode: MA729 by Matsushita Electronic Components Co., Ltd., Cin = Cour = 10uF Tantalum Seiko Instruments Inc. 3PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series 2. 5-83 10BFE (Unless otherwise specified Ta = 25C) Parameter Symbol Conditions Min. Typ. | Max. | Unit. | Test Current consumption ss Vout = 2.375V Sbt= Vour 20 30 uA i IST Vout = 2.375V ,SD1=GND _ 2.1 4 Output voltage Vout Vin = 1.5V, lout = 10mMA 2.440 2.5 2.560 Start-up voltage Vst Ri =Vout/tmA, Vin voltage _ ~ 0.9 Vv Retention voltage Vhid Ri =Vout/1MA, Vin voltage 0.7 _ _ Line regulation AVour(Vin) | Vin = 1-5~2.0V, lou = 10MA _ 18 mV 2 Load regulation AVourllour) | Vin = 1.5V lout = 104A~15mA _ 2 23 Output voltage AVoy; /ATa | Ta =-40 to + 85C _ 0.26) 1.09 | mV/C temperature coefficient Oscillating frequency fosc Vout =2.5V, FB=GND 40 50 60 KHz Maximum duty ratio maxduty | Voyr=2.5V, FB= GND 65 75 85 % Shutdown terminal input Vu Operation 1.8 ~ 8 3 voltage Vs. Shut down V550.3V | ~ 0.7 V Leakage current lek CONT = 8V, 5Di=GND _ 1.0 pA 4 Switch current Isw CONT =0.5V 97 140 _ mA _ VD1 Detection voltage -VDET1 2.147 2.2 | 2.253 Vv Hysteresis width of VD1 hys1 3 4.5 6 % 5 VD1 Detection voltage A-vbeT1 =| Ta=-40 to + 85C _ 0.23 | +0.96 | mV/C temperature coefficient /Ata VD1 Output current (Nch) ISINK1 Vout = 1.3V, VDiour = 0.5V 900 _ pA Operating voltage of VD1 Vddi SDi=GND 0.7 _ 8 y VD2 Detection voltage -VDET2 Vout = 2.5V 0.780 | 0.800 | 0.820 Hysteresis width of VD2 hys2 Vout = 2.5V 2 10 % 7 VD2 Detection voltage A-VDET2. | Ta=-40 to + 85C _ +0.08 | 0.35 | mV/PC temperature coefficient lATa VD2 Output current ISINK2 Vout = 1.3V, VD29y1 = 0.5V 900 _ _ vA 8 (Nch) SENSE = GND Operating voltage of VD2 Vdd2 501 =GND 1.3 = 8 Vv 7 Coil: CD54 (220 pH) by Sumida Electric Co., Ltd. Diode: MA729 by Matsushita Electronic Components Co., Ltd. , Cin= Coy = 10uF Tantalum Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series - 3. $-8310CFE (Unless otherwise specified Ta = 25C) Parameter Symbol Conditions Min. Typ. | Max. | Unit. | Test Current consumption Ss Vour=2.85V'. ont =Vour 23 35 pA 1 IST Vout = 2.85V , 5D1 = GND _ 2.1 4 Output voltage Vout Vin = 1.5V, lour= 10mA 2.928 3 3.072 Start-up voltage Vst RL=Vout/imA, Vin voltage _ _ 0.9 Vv Retention voltage ~ Vhid RL=Vout/imA, Vix voltage 0.7 _ Line regulation AVourVin) | Vin = 1.5~2.0V, lout = 10mMA _ 2 20 mV 2 Load regulation AVourllour) | Vin = 1.5V, lout = 10xzA~15mA _ 2 25 Output voltage AVour /Ata | Ta=-40 to + 85C _ +0.31 | 1.31] mV/C temperature coefficient Oscillating frequency fosc Vout = 3V, FB=GND 40 50 60 KHz Maximum duty ratio maxduty | Voyr = 3V, FB=GND 65 75 85 % Shutdown terminal input Vey Operation 2.1 _ 8 3 voltage Voi Shut down V55-0.3V _ 0.75 V Leakage current Hek CONT = 8V, SD1=GND _ _ 1.0 pA 4 Switch current tgw CONT = 0.5V 120 170 _ mA _ VD1 Detection voltage -VDET1 , 2.147 2.2 | 2.253 Vv Hysteresis width of VDi hys1 3 4.5 6 % 5 VD1 Detection voltage A-VDET1 =| Ta=-40 to + 85C _ +0.23 | 0.96 | mv/C temperature coefficient [Ata | VD1 Output current (Nch) ISINK1 Vout = 1.3V, VD1oyt = 0.5V 900 _ _ pA Operating voltage of VD1 vddt SDi=GND 0.7 - 8 V VD2 Detection voltage -VDET2 Vout =3V 1.073 | 1.100 | 1.127 Hysteresis width of VD2 hys2 Vout = 3V 2 _ 10 % 7 VD2 Detection voltage A-VDET2 | Ta=-40 to + 85C _ 0.11 | 0.48 | mvc temperature coefficient Ata VD2 Output current ISINK2 Vout = 1.3V, VD2oyr = 0.5V 900 _ ~ pA 8 (Nch) SENSE = GND Operating voltage of VD2 vdd2 5D1=GND 1.3 8 Vv 7 Coil: CD54 (220 nH) by Sumida Electric Co., Ltd. Diode: MA729 by Matsushita Electronic Components Co., Ltd., Cin = Coury = 10uF Tantalum Seiko Instruments Inc. 5PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series 4. 5-83 10DFE (Unless otherwise specified Ta = 25C) Parameter Symbol Conditions Min. Typ. | Max. | Unit. | Test Current consumption es Vout = 2.565 spre Vour 2" 32 pA 1 ST Vout = 2.565V ,5D1=GND _ 2.1 4 Output voltage Vout Vin = 1.5V, lour = 10mA 2.635 2.7 | 2.765 Start-up voltage Vst RL=Vout/tmA, Vin voltage _ _ 0.9 Vv Retention voltage vhid Ri = Vout/1mA, Vin voltage 0.7 _ _ Line regulation AVour(Vin) | Vin = 1.5~2.0V, lout = 10mA _ 19 mV 2 Load regulation AVourllour) | Vin = 1.5V lout = 10nA~15mA _ 24 Output voltage AVoyr /ATa | Ta =-40 to + 85C _ +0.28 | 1.17 | mV/C temperature coefficient Oscillating frequency fosc Vour = 3V, FB=GND 40 50 60 KHz Maximum duty ratio maxduty | Voyt =3V, FB=GND 65 75 85 % Shutdown terminal input Vsi4 Operation 2.0 _ 8 3 voltage Vo. Shut down Vs50.3V | 0.7 V Leakage current ek CONT =8V, 5D1=GND _ 1.0 yA 4 Switch current Isw CONT = 0.5V 106 152 _ mA _ VD1 Detection voltage -VDET1 2.147 2.2 | 2.253 Vv Hysteresis width of VD1 hys1 3 4.5 6 % 5 VD1 Detection voltage A-VDET1. | Ta=-40 to + 85C _ +0.23 | + 0.96 | mV/C temperature coefficient /Ata VD1 Output current (Nch) ISINK1 Vout = 1.3V, VD1oyr = 0.5V 900 _- pA 6 Operating voltage of VD1 vddt $Di=GND 0.7 = 8 V VD2 Detection voltage -VDET2 Vout=2.7V 0.976 } 1.000 | 1.024 : Hysteresis width of VD2 hys2 Vout = 2.7V 2 _ 10 % 7 VD2 Detection voltage A-VDET2 | Ta=-40 to + 85C _ 0.10) 0.44 | mv/C temperature coefficient (Ota VD2 Output current ISINK2 Vout = 1.3V, VD2out = 0.5V 900 _ _ LA 8 (Nch) SENSE = GND Operating voltage of VD2 Vdd2 $D1=GND 1.3 _ 8 Vv 7 Coil: CD54 (220 wH) by Sumida Electric Co., Ltd. Diode: MA729 by Matsushita Electronic Components Co., Ltd., Cin = Coyt = 10uF Tantalum Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series - 5. $-8311AFS (Unless otherwise Ta = 25C) Parameter Symbol Conditions Min. Typ. | Max. | Unit. { Test Iss Vout = 1.9V 16 25 SDi= Vout, 5D2=GND Current consumption SSC Vout= 1 OV _ 60 85 pA 1 $D1 = Vout, $D2 = Vout IST Vout = 1.9V _ 2.1 4 SD1= GND, 5D2=GND Output voltage Vour Vin = 1.5V, lout = 10mA 1.952 | 2.000 | 2.048 Start-up voltage Vst RL=Vout/1mA, Vin voltage _ ~ 0.9 Vv Retention voltage Vhid Ri =Vourt/1mA, Vin voltage 0.7 _ _ Line regulation AVourVin) | Vin = 1.5~2.0V, lout = 10mMA _ 2 15 mV > Load regulation AVourllour) | Vin = 1.5V lout = 10nA~15mA _ 2 20 Output voltage AVour /ATa | Ta=-40~ + 85C _ 0.21) 0.87 | mvPc temperature coefficient Oscillating frequency fose Vout =2V, FB=GND 40 50 60 KHz Maximum duty ratio maxduty |Voy7T=2V, FB=GND 65 75 85 % Shutdown terminal input Vsi4 Operation 1.5 _ 8 3 voltage Va | Shut down veowv| 105s] ~ Leakage current tlek CONT = 8V, Di =GND _ _ 1.0 uA 4 Switch current Igwy CONT =0.5V 75 115 _ mA _ VD1 Detection voltage -voeT!1 |SD1=GND 1.740 | 1.787 | 1.831 | Vv Hysteresis width of VD1 hys1 $Di=GND 3 45 6 % 5 VD1 Detection voltage A-VDET1 | Ta=-40~ + 85C _ 0.18) 0.78 | mV/PC temperature coefficient [Ata VD1 Output current (Nch) ISINK4 Vout = 1.3V, VD1our = 0.5V 900 _ pA 6 Operating voltage of VD1 Vdd $D1=GND 0.7 _ 8 y VD2 Detection voltage -VDET2 $D1=GND 0.927 | 0.950 | 0.973 Hysteresis width of VD2 hys2 SD1=GND 2 _ 10 % ; VD2 Detection voltage Q-VDET2 | Ta=-40~ + 85C ~ 0.10] 0.41 | mV/C temperature coefficient iATa VD2 Output current ISINK2 Vout = 1.3V, VD2out = 0.5V 900 _ _ pA 8 (Nch) VSENSE = GND Operating voltage of VD2 vdd2 SDi = GND 1.3 8 7 Clamp reference voltage ViNREF Vin=1.5V0 0.731 | 0.778 | 0.825 Vv 9 D1 =Vour, 502 =Vour Coil: CD54 (220 uH) by Sumida Electric Co., Ltd. Diode: MA729 by Matsushita Electronic Components Co., Ltd., Cin = Coyt = 10uF Tantalum Seiko Instruments Inc. 7PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series HM Test Circuits 1. wi s lout CONT Veg Vout Llout Cour OUT 7 10uF o = Vout 5 AA Wr SENVin Vss Vst: Vin when 90% of Vour are output at the rising of Vin. Turn ON SW1 at the IST test. Vhid: Vin when 90% of Voyt are output at the falling of Vin. Seiko Instruments Inc. 3. 4. _ Vout 3 2000 ~ VOUT LL $D1 CONT | $D1 CONT Vv Vep Oscilloscope V Vrs s aS S Vos Vs 7 5. 6. Vour $ 100K Vour - VDtour = VD tour pe Vss Y Vss T VD1o9ut 7. 8. Vour ; 100KQ Vour SENSE SENSE = VD2out VD2out A V Vout Vv 5 - VD2 7IVSENSE Y "]VseNse T OuT 9. | Vout Vin Vout tt SENVin , y 35000 IN Veg Vsg___ VBASE VBASE VSENIN Vinrer : Vsenin When Vgase Output changes. Figure 3PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series @ Operation 1. Step-Up Regulator The step-up regulator consists of a power MOS EFT, a CR oscillation circuit and an error amplifier. M1 is turned ON or OFF by the CR oscillation circuit. When M1 is turned ON (ton), the energy is stored in the inductor (L); when M1 is turned OFF (torr), the stored energy is supplied via the diode to the capacitor (Court) of Vout (see Figure 4). The Vout output voltage can be selected between 1.8V and 3.6V by 0.1V step. SD1 pin: Stops or starts step-up operation. M1 is turned OFF. When turning SD1 pin low, all of internal circuits stop their operation. This allows the current consumption to be reduced drastically. DO NOT use the SD1 terminal in floating state because of no internal pulling-up and -down. Shut-down pin CR oscillation circuit Output voltage "H" Operation Fixed Lu Stop =Vin* * Voltage obtained by extracting the voltage drop due to DC resistance of the inductor, and the diode forward voltage from VIN The following are basic equations [(1) through (7)] of the step-up switching regulator (see Figure 4). Current i, flowing into Lis zero the moment M1 is turned ON: VAHVS ccc cc cee eee ee eee cere eee e nes (1) (Vs: Non-saturated voltage of M1) The change in IL over time: di, _ Vi__ VinVs (2) nL Dette eeser seers eens Integration of the above equation (i,): IL flows when M1 is turned ON ( ton). The time is determined by the oscillation frequency of the OSC. The peak current (Ipx) after M1 is turned ON (ton): tnx=(Us) 9) <a (4) The energy stored in L is represented with $L (Ipx)*. When M1 is turned OFF (torg), the energy stored in L is transmitted through a diode to the output capacitor. Then reverse voltage (V.) is output. VE= (VouTt Vp) VING eee eee eee teen eneenes (5) (Vp : Diode forward voltage) The voltage at CONT pin rises only by the voltage corresponding to Vout + Vp. When M1 is turned OFF (torr), the current flowing through the diode into Vout changes as follows: diy, - Vi = Vout+ Vp- Vin (6) iL Dt ete ees Seiko Instruments Inc. 9PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series Integration of the above equation is as follows: IL=IpxK (Yours YoY Sac b cence nent een eens eee |D When M1 is turned ON (ton), the energy is stored in L and is not transmitted to Vout. When receiving output current (lout) from Vout, the energy of the capacitor (Coyt) is consumed. As a result, the pin voltage of Cour is reduced, and goes to the lowest level after M1 is turned ON (ton). When M1 is turned OFF, the energy stored in L is transmitted through the diode to Court, and the voltage of Cour rises drastically. Vout is a time function that indicates the maximum value (ripple voltage Vp-p) when the current flowing through the diode into Vour and load current (lout) match. Next, the ripple voltage is found out as follows: lout VS ty (time) from when M1 is turned ON ( ton) to when Vout reaches the maximum level: _ Vour+Vp-V Iout=Ipx- ( 7: IN }. by eee cece reer eee eens (8) L ty = (IpK Iout) Torti) beeen e eee eeeeneeaees (9) When M1 is turned OFF (torr), IL =0 (when the energy of the inductor is completely consumed). Based on equation (7), L torr a ccc cence tenn eee e eens 10 (Goat Vp- Vin ) IpK oo) When substituting equation (10) for equation (9), t1=tore -(70U2 ) Se 0 -) - (11) Electric charge AQ1 which is charged in Coyt during t1: Vour+Vp-V AQ, = Shiydt=Ipg: f t:dt- CUP IN pt tat 0 0 L 0 When substituting equation (9) for equation (12): 1 Ipx +1 AQ =Ipx- =z ex lour) *ty= PK 2 OUT oS (13) _Arise in voltage (VP-P) due to AQ1: A Vp.p= Q = Gi (xtlour) bee eee eeeneeeeees (14) Cour Cour 2 When taking into consideration Ioyt to be consumed during t1: A . Vpp= a= (Jetour) - JouT , (15) Cour Cour 2 Cour When substituting equation (15) for equation (11): . (px-Igut)? t Vp.p= ee OU OEE vvccceceeeeees (16) 2Ipx Cour L Di Vin OT * DP ~ > SDT leone lve =e lou $83 10/11 osc M1 at Figure 4 10 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series - 2. Voltage Detectors (VD1, VD2) The S-8310/8311 Series has two voltage detectors. The power of the voltage detectors is supplied from Vout . When Vout is below the operating voltage Vddi and Vdd2, the voltage detector does not function normally. The detectors function regardless of SD1 or SD2. Detector VD1 internally monitors the voltage of Vour. Detector VD2 can detect any voltage by connecting the SENSE terminal (see Figure 5). The VD1 detection voltage can be selected between 1.5V and 3.2V by 0.1V step. The VD2 detection voltage can be selected between 0.8V and 2.0V by 0.1V step. _. SENSE Vout $8310/11 7, Figure 5 3. Voltage Clamp Circuit The built-in voltage clamp circuit in the S-8311 Series prevents a drop in the battery voltage caused by large current and internal resistance of the battery (clamp voltage), and controls the current flowing into a load. This prevents the step-up switching regulator from stopping. This clamp voltage can be set to the following equation by using the resistance viaues R1 and R2. As shown in the circuit of Figure 6, Vij does not drop below this clamp voltage. Always set R1+R2 below 1 MQ. Vclamp, however, cannot be set below 0.9 V. Velamp = ae X VINREF The power of the voltage clamp circuit (Amp1) is supplied from Voyr. According to the signal of SD2, M2 is turned ON, M3, M4, and M5 are turned OFF, and Amp1 is turned OFF. The current does not flow into the circuit and its clamp operation stops. The standard voltage to Amp/ is obtained by dividing Vout voltage with resistors R3 and R4. DO NOT use the SD2 terminal in floating state because of no internal pulling- up and -down. When using a motor as a load, connect in parallel a capacitor C_ of 10 uF or more to the load in order to ensure stable operation. x | $8311 ve | Vessel R 3 R3 M3 Amp! Load kc, /+ << VINREF & I a SRI 5 SENVin | SR2 ) SENGND |_ M4 M5 lt re J | sD2 Seiko Instruments Inc. 11PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series Select a PNP transsistor among transistors having the following characteristics: @ her <100 or more (Ic = 100 mA) @ Vsat<0.15 V (Ic =100 mA) The 2SA1362GR or similar transistors are recommendable. Figure 7 shows the characteristics of the M3 transistorss sink current. VouT=1.8V VouT=3.6V IBASE IBASE (mA) (mA) 10 10 =0.5V Vps=0.1V HO Ws =0.1V 100 650 VSEN (mV) 850 0.8 VSEN (V) 1.0 Figure 7 HM External Part Selection Guidelines 1. Inductor To minimize a loss due to inductor DC resistance, select an inductor with a resistance of less than 1 DC. Set the inductance value from 47H to 220 uH. To stabilize the output voltage (Vout), it is necessary to supply the energy corresponding to the output current (lout) from the inductor. The amount of charge required for lout is lour*(ton+torr). Because the inductor cannot supply the energy except when M1 is turned OFF (tor), the charge is obtained by integrating equation (7) with 0 torr, namely, EK -torr. Thus, EK. torr=lourX (tONTtORF) -.e eee ce scene cece ee eeeenees (17) Ipk=2- ton+torr | lout top HOUT verter erent When the duty ratio of the OSC is 75%, IpK=8loyr. Therefore, an Ipx current 8 times as higher than Igurt flows into transistor Mi. The S-8310/11 Series, however, includes a switching circuit that controls the current flowing through CONT in order to prevent the IC from being broken due to the excess current. The current limit value is internally set to approximately 320 mA. When selecting an inductor with a large value of L, both Ipx and Ioyy decrease. With the energy stored in the inductor is equal to iL - (Ipx), evern if L becomes large, the energy still decreases because Ip, is squared. As a result, step-up at low voltage becomes difficult and the start-up voltage becomes high. However, with DC resistance loss in L and the M1 transistor reduced by only the decrease in Ipx, inductance efficiency improves. On the other hand, when selecting an inductor with a small value of L, both Ipx and lout increase. The start-up voltage decreases. The inductance efficiency, however, worsens. 12 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series - [CAUTION] An excess increase in Ipx may decrease efficiency drastically due to magnetic saturation depending upon a core material. Use a core material that ensures Igar>IpK (lsat: Current causing magnetic saturation). 2. Diode Use an external diode that can meet the following requirements: @ Low forward voltage - (Vp <0.3V) e@ High switching speed (500 ns max.) @ Reverse voltage: Vout+ Ve or more Rated current: Ip, or more 3. Capacitors (Cin, Court) Mounting a capacitor at the input side (Ci) can improve the efficiency, reduce the power impedance and stabilize the input current. Select a value of C;y according to the impedance of the power supply you use and set the value of the capacitor to approximately 10 F. The capacitor mounted at the output side (Court) is used for smoothing the ripple voltage. Select a capacitor with small ESR (Electric Series Resistance) and large capacitance. Set the value of the capacitor to approximately 10 uF. We recommend you use a tantalum electrolytic capacitor or an organic semiconductor capacitor which is superior in temperature and leakage current characteristics. Seiko Instruments Inc. 13PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series M@ Standard Circuit t i VD2ouT tor Ah WAr = SENVIN SENGND ee LY, sp2 | Js VouT Figure 8 Note: To decrease the ripple voltage at Vout terminal, insert a x-type filter between Veg and Vour. When Vout voltage approximates to detection voltage VD1, VD1 may be detected due to the ripple voltage. Be careful!! $e $8310/11 paw Figure 9 M@ Precautions @ Mount external capacitors, a diode, and a coil nearest to the {C. Always set wiring resistance between the positive terminal of the capacitor (which is connected to Vout terminal) and Vout terminal of the IC to less than 0.2 . Also, ensure the wiring length of 2.cm or less. If impossible, set a 0.1 F ceramic capacitor to Vout terminal as near as possible. Ripple voltage or spike noise may ordinally occur in switching regulators. Check it using an actually mounted model. e@ Seiko instruments Inc. is not responsible for any problems caused by circuits or other diagrams described herein whose industrial properties, patents or other rights belong to third parties. Make sure a loss (especially at high temperatures) in the switching transistor does not exceed the package power dissipation. 600 a a: 16-pin SSOP Power dissipation 400 b: 8-pin SOP Pp (mW) 200 0 0 50 100 150 Amb. Temperature Ta (C) Figure 10 Package power dissipation (before mounting) 14 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series MH Physical Dimensions 8 - Pin SOP ($-8310) _ 5.2(5.5 max.) 4 typ. A RAR & ; i 6.440.3 ! | 1 4 fc 0-15 010s A J q | I } yi5 20.1 {1-7 max. a r 40.0 min. 1.27 0.4+0.1 Unit: mm Figure 11 16 - pin SSOP (S-8311) 6.8 (7.1 max.) BRABBBAAT +" | 4.4 (5. | 6.2403 BHHBHERE 4 +0.1 [<1 - 0.05 {Creer fe 1.7 max. st te LLL fomin. 0.8 0.36+0.1 Unit: mm Figure 12 1 Markings 1. $8310 [| [| [| [| [| 1to6 : Productname 1 > 3 4 5 7 : Assembly code 7 8 : Year of assembly (last digit) | [| [| [| 9 : Month of assembly; Jan.=1, Feb.=2, Mar. =3, Apr. =4, 6 7 8 9 May = 5, Jun. = 6, Jul.=7, Aug. = 8, Sept. =9, Oct.= X, [| [| [| Nov.= Y, Dec. =Z 10 to 12: Lot No. 1 41041 0 2 Figure 13 2. $8311 [ [ [| ] [ | [| 1to6 : Productname 7 : Assembly code 1 2 3 4 5 6 : Year of assembly (last digit) 8 [| [| [| [| [| [| 9 : Month of assembly; Jan. =1, Feb.=2, Mar.=3, Apr. =4, 7 8 9 0 11 12 May = 5, Jun. = 6, Jul. =7, Aug. = 8, Sept. =9, Oct. = X, Nov.= Y, Dec. =Z 10 to 12: Lot No. Figure 14 Seiko Instruments Inc. 15PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series M@ Taping 1. Tape specifications ($8310) 250503 2.0+0. 4.0+0.1 10 : 40.0 + 0.2) 1.55+0.05 12.0+0.1 1.75 40.1 16.0 + 0.25 0.5+0.1 5 max. 3 max, 8340.1 XT | Type T2 000000000 1-pin mar ___ tae Feed direction Unit: mm Figure 15 2. Reel specifications 1 reel holds 2000 ICs. 4+} | 240.5 mg! beat e ~~ 933042 > 16.442.0 Unit : mm Figure 16 16 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series He Taping 1. Tape specifications ($8311) 2.1040.1 2. Reel specifications 1 reel holds 2000 ICs. 4.0+0.i(total 10 : 40.0 +0.2) 1.7540.1 5.5+0.05 12.040.2 5.55 +0. 3 max. en20ittk Ee yp | Type T2 eoooo0o0ao0 0 1 . Feed direction Unit: mm Figure 17 $13 0.5 Unit: mm Figure 18 Seiko Instruments Inc. 17PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series HM Characteristics (typical data) 1. Current consumption Power voltage 30 Tas ~ Loe a 20 } LP Iss Ta = 25C (uA) Ta= 100C 10 0 1.0 2.0 3.0 4.0 Vout (V) 2. Oscillation frequency, maximum duty ratio - Temperature 60 fosc (kHz) 50 40 ee Pw -50 0 50 Ta (C) 3. Shutdown terminal input voltage - Output voltage 100 2.0 | Ta= - 40C ' 15 Ta ; 25C VsH, SL | (Vv) Ta= 100C 1.0 Ta= - 40~100C 0.5 ; 1.0 2.0 3.0 Vout (V) 4.0 3 Ta= 100C Ist 2 wee (ZA) 1 [Ta = 25 ee OE 0 1.0 2.0 3.0 4.0 Vout (V) 90 80 Maximum duty (%) 70 60 -50 0 50 100 Ta (C) 4. CONT switching current - Output voltage 300 Ta= -406ITa = 25C Isw 200 WZ 100 4 oa A Taz 100C 0 1.0 2.0 3.0 4.0 Vout (V) 5. Operation start, retention voltage - Temperature 5-831 1AFS ~ | 5-8310AFE TS\ ~50 0 50 Ta (C) 100 Vhlid (V) 50 Use only parts which meet specified electrical characteristics. 0.9 0.8 Vst (V) 0.7 0.6 18 Seiko lristruments Inc. $-83 10AFE $-8311AFS 0 50 Ta(C) 100PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series _ 6. Ripple voltage - Output current Ta = 25 (C) 30 T T $-8310AFE 25 20 SS yt 15 srr (mV) ts Vin = 1.5V | 10 1 A | 2.0V 5 0 0 2 4 6 8 10 lout (mA) 30 25 20 Vr (mv) 15 10 Use only parts which meet specified electrical characteristics. MI Reference Data 1. Transit response characteristics Use only parts which meet specified electrical characteristics. 1.1. Powering on (Ta = 25C) Vine OV21.5V, lout=5 mA Sample S-8310AFE Input voltage (1Vidiv) 1.5V ov 3V Output voltage (1V/div) OV t(1msec/div) 1.2 Shut down response (Ta = 25C) $D1=0V-Vour, Vin=1.5V, lout=5mA Sample $-8310AFE SD1 voltage (1V/div) ov Output voltage (0.5V/div) t ({msec/div) Seiko Instruments Inc. Ta=25(C) | q S-8311AFS Vin=1.0V yA a c > paar] Leeann jet 1.5V 2 4 6 8 10 lout (mA) Sample $-8311AFS Input voltage (1V/div) Output voltage (1V/div) Sample $-8311AFS $D1 voltage (1V/div) Output voltage (0.2V/div) t (2msec/div) t (0.5msec/div) 1.5V 2V 19PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series 1.3. Power voltage variation (Ta = 25C) Vin= 1.3VeVoyt, lout=5mA Sample 5-83 10AFE Sample S-83 10AFE 3V Input Input voltage 1.3V voltage 1.3V (1V/div) (1V/div) Output Output voltage 3V volatge 3V (0.2V/div) (0.2V/div) t (imsec/div) t (imsec/div) Sample $-8311AFS Sample $-8311AFS 2V Input Input voltage voltage 1.3V (0.5V/div) (0.5V/div) 2V Output Output voltage voltage t (1msec/div) t (1msecdiv) 1.4 Load current variation (Ta = 25C) lout= 10zA@5 mA, Vin=1.5V Sample S-8310AFE Sample 5-83 10AFE lout=5mA out = Output Output current lout = 104A current Output 3V Output 3V voltage voltage (0.2V/div) (0.2V/div) t(0.5msec/div) t (SOmsec/div) Sample S-8311AFS Sample S-8311AFS lout = 5mA lout=5mA Output - Output Current lout = 104A Current 2V Output Output voltage voltage (0.2V/div) (0.2V/div) t (0.5msec/div) t (SOmsec/div) 20 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS WM Reference Data The following are step-up characteristics when using the coils shown in the following list: Evaluated coils S-8310/8311 Series Model Manufacturer Value L (4H) Max. DC resistance (Q) Permissible current (mA) CD54 Sumida Electric 47 0.37 720 t t 100 0.7 520 t t 220 1.57 350 LQH3C Murata Mnaufacturing 47 1.7 170 t t 100 4.6 100 CP4LBM Sumida Electric 47 2.2 220 t t 220 10.5 100 For parts other than coils, use parts which meet specified electrical characteristics. [1] S-8310AFE 1.1 CD54 (47zH), Ta= 25C (a) Input voltage - Output voltage characteristics (rise in input voltage) Output voltage Vout (V) out = 30mMA 0.0 1.0 2.0 3.0 4.0 Input voltage Vin (V) (c) Output current - Output voltage characteristics 3.2 3.0 Output voltage 28 Vout (V) 2.6 2.4 ~ 0.0 20 40 60 80 100 Output current lout (mA) Output voltage 39 Vout (V) (b) Input voltage - Output voltage characteristics 3.6 3.4 3.2 2.8 2.6 2.4 0.0 0.5 1.0 (fall in input voltage) lout=30mA 1.5 2.0 2.5 3.0 Input voltage Vin (V) (d) Efficiency - Input voltage characteristics 100 90 Efficiency % 7(%) 80 imA 70 10mA 60. 0.0 1.0 lout=0.1mA 2.0 3.0 4.0 Input voltage Vin (V) Seiko Instruments Inc. 21PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series 1.2 D54(100zH), Ta= 25C (a) Input voltage - Output voltage characteristics (rise in input voltage) Output voltage Vout (V) 0.0 1.0 2.0 3.0 Input voltage Vin (V) 4.0 (c) Output current - Output voltage characteristics 3.2 3.0 Output voltage 28 Vout (V) Vin= 1.5V 2.6 2.4 0 20 40 60 80 Output current lout (mA) 100 1.3. CDS4(220uH), Ta= 25C (a) Input voltage - Output voltage characteristics ) (rise in input voltage) Output voltage Vout (V) 0.0 1.0 2.0 3.0 4.0 Input voltage Vin (V) 22 Output voltage 0 Vout(V) (b) Input voltage - Output voltage characteristics (fall in input voltage) 3.6 3.4 3.2 2.8 lout = 26 out=30mA 2.4 0.0 0.5 1.0 1.5 2.0 Input voltage Vin (V) 2.5 (d) Efficiency Input voltage characteristics 100 90 Efficiency (%) ? 80 30mA 70 lout=0.1mA 60 0.0 1.0 2.0 3.0 4.0 Input voltage Vin (V) (b) Input voltage - Output voltage characteristics (fall in input voltage) Output voltage Vout (V) lout = 30mA 0.0 1.0 2.0 3.0 Input voltage Vin (V) Seiko Instruments Inc. 4.0PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series (c) Output current - Output voltage characteristics (d) Efficiency - Input voltage characteristics 3.2 100 3.0 90 Output Efficiency voltage 2.8 7 (%) 80 Vout (V) 30mA 2.6 70 lout=0.1mA 2.4 60 0 20 40 60 80 100 0.0 1.0 2.0 3.0 4.0 Output current lout (mA) Input voltage Vin (V) 2.1 LQH3C (47H), Ta= 25C (a) Input voltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) 3.6 3.4 3.2 Output tmA-10mA Output voltage voltage 3.0 Vout (V) Vout (V) 2.8 2.6 . 2.4 0.0 1.0 2.0 3.0 4.0 , 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Input voltage Vin (V) Input voltage Vin (V) Seiko Instruments Inc. : 23PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series (c)- Output current - Output voltage characteristics (d) Efficiency - Input voltage characteristics 3.2 100 3.0 90 Output Efficiency voltage 28 7 (%) 80 Vout (V) Vin=1.5V ma 2.6 70 lout =0.1mA 1OmA 2.4 60 0 20 40 60 80 100 0.0 1.0 2.0 3.0 4.0 Output current lout (mA) Input voltage Vin (V) 2.2 LQH3C(100zH), Ta = 25C (a) Input voltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) 3.6 3.6 3.4 3.4 3.2 3.2 Output imA10mA Output voltage 309 voltage 39 Vout (V) Vout (V) 2.8 2.8 2.6 2.6 2.4 2.4 0.0 1.0 2.0 3.0 4.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 input voltage Vin (V) Input voltage Vin (V) (c) Output current - Output voltage characteristics (d) Efficiency - Input voltage characteristics 3.2 100 3.0 90 Output Efficiency voltage 2.8 7(%) 80 Vout (V) imA #7 10mA 2.6 Vins 1.5V 70 lout=0.1mA 2.4 60 0 20 40 60 80 100 0.0 1.0 2.0 3.0 4.0 Output current lout (mA) Input voltage Vin (V) 24 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series - 3.1. CP4LBM (47H), Ta = 25C (a) Input voltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) 3.6 3.4 3. ; 3.2 Output imA-10mA Output voltage voltage 39 Vout (V) Vout(V) 7 2.8 2.6 out = 30mA : 2.4 0.0 1.0 2.0 3.0 4.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Input voltage Vin (V) Input voltage Vin (V) (c) Output current - Output voltage characteristics (d) Efficiency - Input voltage characteristics 3.2 100 3.0 90 Output , Efficiency voltage 28 Vin = 1.5V n(%) 80 Vout (V) imA 26 10mA lout = 0.1 2.4 60 0 20 40 60 80 100 0.0 1.0 2.0 3.0 4.0 Output current lout (mA) Input voltage Vin (V) 3.2 CPALBM (220uH), Ta= 25C (a) Inputvoltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) 3.6 3.6 3.4 3.4 3.2 3.2 Output Output voltage 0 voltage 39 Vout (V) Vout (V) 2.8 2.8 out= 10mA 2.6 2.6 2.4 2.4 0.0 1.0 2.0 3.0 4.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 - Input voltage Vin (V) Input voltage Vin (V) Seiko Instruments Inc. 25PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS $-8310/8311 Series (c). Output current - Output voltage characteristics (d) Efficiency Input voltage characteristics 3.2 100 3.0 90 Output Efficiency voltage 2.8 n(%) 80 Vout (V) 2.6 fVin= 1.5V 70 1 lout =0.1mA 10mA 2.4 60 0 20 40 60 80 100 0.0 1.0 2.0 3.0 4.0 Output current lout (mA) Input voltage Vin (V) 26 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series [IT] $-8311AFS 1.1 CDS4 (47H), Ta = 25C . (a) Input voltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) 2.6 2.4 Output 2.2 Output voltage 20 voltage Vout(V) ~~ Vout (V) 1.8 1.6 10mA =3 1.4 : 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 input voltage Vin (V) Input voltage Vin (V) (c) Output current - Output voltage characteristics (d) Efficiency Input voltage characteristics (rise in input voltage) (fall in input voltage) 100 90 Output Efficiency voltage 7 (%) Vout (V) 10mA 70 lout =0.1mA . 60 0 10 20 30 40 50 0.0 1.0 1.5 2.0 2.5 3.0 Output current lout (mA) Input voltage Vin (V) 1.2) CD54 (100yH), Ta = 25C (a) Input voltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) Output Output voltage voltage Vout (V) Vout (V) 10mA 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 Input voltage Vin (V) Input voltage Vin (V) Seiko Instruments Inc. 27PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series (c)- Output current - Output voltage characteristics 2.2 2.0 Output voltage 41.8 Vout (V) 1.6 Vin = 1.0V 1.4 0 10 20 30 40 50 Output current lout (mA) 1.3. CD54(220uH), Ta= 25C (a) Input voltage ~ Output voltage characteristics (rise in input voltage) 2.6 2.4 Output voltage Vout (V) 1.8 10mA 1.6 out =30mA 1.4 0.0 0.5 1.0 15 2.0 2.5 Input voltage Vin (V) (c) Output current - Output voltage characteristics 2.2 2.0 Output voltage 1.8 Vout (V) 1.6 1.4 0 10 20 30 40 50 Output current lout (mA) (d) Efficiency - Input voltage characteristics 100 90 Efficiency 7 (%) 70 60 0.0 1.0 1.5 2.0 2.5 3.0 Input voltage Vin (V) (b) Input voltage - Output voltage characteristics (fall in input voltage) Output voltage Vout (V) mA 10mA =30mA "0.0 0.5 1.0 1.5 2.0 Input voltage Vin (V) (d) Efficiency Input voltage characteristics 100 90 Efficiency 1(%) 10mA lout=0.1mA 70 60 0.0 1.0 1.5 2.0 2.5 3.0 Input voltage Vin (V) 28 Seiko Instruments Inc.PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series - 2.1 LQH3C (47uH), Ta=25C (a) Input voltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) 2.6 2.6 2.4 2.4 . 2.2 Output 2.2 Output voltage 49 voltage > 9 lout = 30mA Vout(V) ~~ Vout (V) ~~ 1.8 1.8 1.6 1.6 1.4 1.4 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 Input voltage Vin (V) Input voltage Vin (V) (c) Output current - Output voltage characteristics (d) Efficiency - Input voltage characteristics 2.2 100 2.0 90 Output Efficiency voltage 1.8 7 (%) Vout (V) ImA 1.6 70 10mA =0.1mA 1.4 60 0 10 20 30 40 50 0.0 1.0 1.5 2.0 2.5 3.0 Output current lout (mA) Input voltage Vin (V) 2.2 LQH3C (1004H), Ta = 25C (a) Input voltage - Output voltage characteristics (b) Input voltage - Output voltage characteristics (rise in input voltage) (fall in input voltage) Output Output voltage voltage : lout = 30mA Vout (V) Vout(V) ~ 1ImA 10mA "0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 Input voltage Vin (V) Input voltage Vin (V) Seiko Instruments Inc. 29PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series (c). Output current - Output voltage characteristics 2.2 2.0 Output voltage 1.8 Vout (V) 1.6 Vin = 1.0V- 1.4 0 10 20 30 40 50 Output current lout (mA) 3.1 CP4LBM (47H), Ta= 25C (a) Input voltage - Output voltage characteristics (rise in input voltage) 2.6 2.4 2.2 Output voltage Vout (V) 2.0 1.8 1.6 1.4 0.0 0.5 1.0 1.5 2.0 2.5 Input voltage Vin (V) (c) Outputcurrent - Output voltage characteristics 2.2 1.5V 2.0 Output voltage 18 - Vout (V) Vin = 1.0V 1.6 1.4 0 10 20 30 40 50 Output current lout (mA) 3.0 (d) Efficiency - Input voltage characteristics 100 Efficiency 7(%) (b) Input voltage - Output voltage characteristics Output voltage Vout (V) 90 70 lout=0.imA 60. 0.0 0.0 imA 1.0 10mA 1.5 2.0 2.5 Input voltage Vin (V) (fall in input voltage) out =30mA ImA 10mA 0.5 1.0 1.5 Input voltage Vin (V) (d) Efficiency - Input voltage characteristics 1 Efficiency 7(%) 30 Seiko Instruments Inc. 00 90 70 66 0.0 =0.1mA 1.0 10mA 1.5 2.0 2.5 Input voltage Vin (V) 3.0 2.0 3.0PWM STEP-UP SWITCHING REGULATOR WITH VOLTAGE DETECTORS S-8310/8311 Series - 3.2 CP4LBM (220zH), Ta= 25C (a) Input voltage - Output voltage characteristics (b) Input voltage ~ Output voltage characteristics (rise in input voltage) (fall in input voltage) 2.6 2.6 2.4 2.4 : 2.2 Output 2.2 Output voltage voltage 2.0 Vout (V) 2.0 Vout(V) ~~ 1.8 1.8 out =30mA 1.6 1.6 mA 1 1.4 1.4 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 Input voltage Vin (V) Input voltage Vin (V) (c) Output current - Output voltage characteristics (d) Efficiency Input voltage characteristics 2.2 100 2.0 90 Output Efficiency voltage 1.8 % Vout (V) 7(%) 1.6 Vin = 1.0V 70 lout = 0.1mA 10mA 1.4 60 0 10 20 30 40 50 0.0 1.0 1.5 2.0 2.5 3.0 Output current lout (mA) Input voltage Vin (V) Seiko Instruments Inc. 31