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Lithium-Ion Battery Charge Control

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MITSUMI
Lithium-Ion Battery Charge Control (with timers) MM1639
Lithium-Ion Battery Charge Control (with timers)
Monolithic IC MM1639
Outline
This is a lithium-ion battery charge control IC. It incorporates constant-voltage and constant-current circuits
for easy implementation of lithium-ion battery charge. It includes functions to disable charging to
overdischarged batteries, disable charging due to abnormal temperature, etc., and timer functions. It is also
equipped with a 2-channel LED driver to allow the charge status to be displayed.
Features
1. Operating supply voltage
2.7~5.9V
2. Operating ambient temperature
-20~70ºC
3. Current consumption
5.0mA typ.
4. Low voltage detection voltage
2.0V typ.
5. BAT pin output voltage
4.20±0.03V (Ta=0~50ºC)
6. Recharge detection voltage
3.90V typ.
7. Precharge detection voltage
2.90V typ.
8. Fast-charge current setting Rsense=0.22V/IqCHG Example: For 0.70A, 0.22V/0.70A=0.31(Rsence)
Precharge current 0.026V/Rsence=0.026/0.31=0.084A
Full-charge current
Example: 0.018V/0.31=0.058A
Adjustable full-charge: normally fixed at 0.103V. Full-charge current can be varied by adjusting the ADJ pin
voltage.
Example: For 0.2A, the ADJ2 pin voltage is 0.062 4 = 0.248V.
(Adjustable by placing 50kbetween ADJ2 and VREF)
9. Total timer (C=0.01uF, for R = 130k T=1.77ms)
Precharge timer T 219
Overvoltage detect delay time T 28
Full-charge timer T 223
Recharge detection delay time T 25
1mA charge timer T 213
LED R blinking cycle T 210
Full-charge delay time T 29
Overcurrent detection delay time T 28
10. During timeout, abnormal charge, 1mA charge MM1639E LED-R=blinking
MM1639F LED-R=off
Package
VSOP-16A
Pin Assignment
16 15 14 13 12 11 10 9
12345678
VSOP-16A
1 SW 9 CS
2 TP1 10 CFB
3 TP2 11 CNT
4
VREF
12
VCC
5
GND
13 LED G
6
ADJ2
14 LED R
7
TDET
15 OSC OUT
8
BAT
16 OSC FB-
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