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.
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=0.31Ω (Rsence) |
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Precharge current 0.026V/Rsence=0.026/0.31Ω=0.084A |
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Full-charge current |
Example: 0.018V/0.31Ω=0.058A |
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Adjustable full-charge: normally fixed at 0.103V. Full-charge current can be varied by adjusting the ADJ pin voltage. |
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Example: For 0.2A, the ADJ2 pin voltage is 0.062×4 = 0.248V. |
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(Adjustable by placing 50kΩ between ADJ2 and VREF) |
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9. |
Total timer (C=0.01uF, for R = 130k T=1.77ms) |
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Precharge timer T×219 |
Overvoltage detect delay time T×28 |
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Full-charge timer T×223 |
Recharge detection delay time T×25 |
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1mA charge timer T×213 |
LED R blinking cycle T×210 |
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Full-charge delay time T×29 |
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Overcurrent detection delay time T×28 |
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10. |
During timeout, abnormal charge, 1mA charge |
MM1639E LED-R=blinking
MM1639F LED-R=off |
