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SP6641BEK-L-5-0 Datasheet(PDF) 11 Page - Sipex Corporation |
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SP6641BEK-L-5-0 Datasheet(HTML) 11 Page - Sipex Corporation |
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11 / 13 page  11 Rev. 5/26/05, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 © Copyright 2002 Sipex Corporation Low Battery Circuit for SP6641 Application The circuit in figure 17 uses the Sipex SPX432 shunt regulator as a reference and comparator circuit to detect a low battery condition and give a high level, typically 1.7V output. When the battery is good, the SPX432 output is low, but not at ground but at 0.8V or about one Vbe below the 1.24V reference. To translate that level to a CMOS Low of less than 0.4V, an NPN and 2 signal diodes can be added to the SPX432 Figure 17. SP6641A 3.3V with Low Battery Detection APPLICATION INFORMATION: continued output, as shown. The small SOT23-3pin 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 µA current from 3.3V out. As a bonus, the output of this circuit can be used to drive the SP6641 SHDN_N pin 3 to GND when the bat- tery is removed, which would reset the SP6641 and eliminate the need for the SuperCap Switch shown in figure 16. GND LX VBATT L1 22µH 100k U1 SP6641 VOUT SHDN ® ® C2 22µF R3 20k Diode Schottky 1 2 3 C1 22µF 5 4 VBATT R5 100k BATT GOOD D2 D3 1N4148 R2 100k R1 44k 1N4148 VOUT 3.3V Q2 2N3904 2V = BATT GOOD 0V = LOW BATT R4 1 2 3 REF K A 1.8V THRES. VTHRES = 1.24V(1 + R1/R2) U2 SPX432M SOT23-3 D1 GND LX VBATT SHDN J1 L1 22µH 2.7V, 0.9Ω PMOS SOT23-3 IRLML6302 Q1 U1 SP6641 VOUT SHDN ® ® C2 22µF VOUT +3.3V Diode Schottky 1 2 3 C1 22µF 5 4 1 2 3 VBATT C3 .22F Supercap 3.3V to Nonvolatile Function 32 1 3 1 2 Q2 SOT23-3 IRLML2402 2.7V NMOS R1 1M Figure 16. SP6641A 3.3V with SuperCap Switch |
Similar Part No. - SP6641BEK-L-5-0 |
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Similar Description - SP6641BEK-L-5-0 |
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