SP6641 Sipex, SP6641 Datasheet
SP6641
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SP6641 Summary of contents
Page 1
... The SP6641 features quiescent current, a 0.3 channel charging switch, 0.9V input startup, and a 0.33A or 1.0A inductor current limiting feature. The SP6641 is offered pin SOT-23 package and provides an extremely small power supply footprint optimized for portable applications. The SP6641 is preset to 3.3V and can be controlled by a 1nA active LOW shutdown pin ...
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... Output Current (SP6641BEK-5.0) Minimum Off-Time Constant K OFF NMOS Switch Resistance SHDN Input Voltage Vil Vih SHDN Input Current Rev. 3/5/02, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 LX SHDN, V OUT LX Current .......................................................... 1.5A Reverse V Current ................................... 220mA BATT Storage Temperature ........................ - 150 C Operating Temperature ..................... - +85 C Lead Temperature (Soldering, 10 sec) .......... 300 C < ...
Page 3
... Output voltage sense pin, internal regulator voltage supply, and minimum off-time one shot input. Kelvin connect this pin to the positive terminal of the output capacitor, but for SP6641B, use 10 series resistor and 1 F bypass per Figure 1 schematic. Shutdown. Tie this pin to V for normal operation ...
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... AMB 100 0.1 1.0 10.0 Iload (mA) Figure 3. SP6641AEK - 3.3 Efficiency vs Load Current 3.400 3.380 2.6V 3.360 2.0V 3.340 IN 3.320 3.300 3.280 3.260 3.240 3.220 3.200 0 50 100 150 Iload (mA) Figure 5. SP6641AEK - 3.3 Line/Load Rejection vs Load Current 100 ...
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... SP6641AEK-3. SP6641AEK-5. SP6641AEK-5. 0.5 1.0 1.5 2.0 2.5 3.0 Vin (V) Figure 13. SP6641AEK-3.3 & SP6641AEK-5.0 Maximum Resistive Load Current in Startup Rev. 3/5/02, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 5.100 5.080 5.060 5.040 5.020 5.000 4.980 4.960 4.940 4.920 4.900 0 200 250 Figure 10. SP6641BEK-5.0 Line/Load Rejection Vs ...
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... SOT23 5 pin package, and precise inductor peak current control. SP6641A sources up to 90mA at 1.3V, typ. and SP6641B sources up to 500mA at 2.6V, typ. by supporting different peak inductor current levels. Only two capacitors, an inductor, and a diode are required to build a power supply for the SP6641A ...
Page 7
... V = Forward schottky drop, (0.4V, typ Average charging switch drop, C Rnmos*I , typically 0.1V PK Rev. 3/5/02, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 Ignoring the conduction losses of V the burst frequency equation simplifies to: F – K /2L) is BURST PK OFF Startup The internal regulator circuitry is bootstrapped ...
Page 8
... The SP6641A evaluation board uses a Sumida CDRH5D28 22 H inductor with an Isat value of 0.9A and a DCR of 0.095 , which easily handles the Ipeak of 0.33A of the SP6641A and will deliver high efficiencies. The SP6641B evaluation board uses a Sumida CDRH5D28 10 H inductor with an Isat value of 1.3A and a DCR of 0 ...
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... SP6641A Ipk = .33A STMicro STPS0520Z SP6641B Ipk = 1A Zetex ZCHS2000 Note: Components highlighted in bold are those used on the SP6641A or SP6641B Evaluation Board. Rev. 3/5/02, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 From the curves in Figures 13 and 14, you can see that for low input voltages, the 22 H induc- ...
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... Supercap connected to the output. The typical Supercap of 0.22F will go from fully charged at 3.3V to less than minutes. The following appli- TABLE 2. SP6641A Resistive Load Current in Startup - low cost inductors SP6641A APPLICATION CIRCUIT WITH PANASONIC INDUCTOR L1 = ELJ-PB220KF 22 H, IDCmax = 300mA, DCR = 1.0 Startup ...
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... SPX432 and 2N3904 bipolar transistor and di- odes are small and inexpensive to add to the SP6641 circuit and work well to add a Battery Low detection circuit, with the addition of about 130 A current from 3.3V out bonus, the output of this circuit can be used to drive the ...
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... Rev. 3/5/02, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 PACKAGE: 5 Lead SOT23 .10 SYMBOL MIN MAX A 0.90 1.45 A1 0.00 0.15 0.90 1.30 A2 0.25 0.50 b 0.09 0.20 C 2.80 3.10 D 2.60 3.00 E 1.50 1.75 E1 0.35 0. 0.95ref e1 1.90ref 0.20 ' DATUM 'A 2 © Copyright 2002 Sipex Corporation ...
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... SP6641AEK-3.3/TR ............. K1 ...................... - ........ (Tape & Reel) 5-Pin SOT-23 SP6641BEK-3.3/TR ............. L1 ...................... - ........ (Tape & Reel) 5-Pin SOT-23 SP6641AEK-5.0/TR ............. P1 ...................... - ........ (Tape & Reel) 5-Pin SOT-23 SP6641BEK-5.0/TR ............. Q1 ...................... - ........ (Tape & Reel) 5-Pin SOT-23 Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation ...