The DW01A is a battery protection IC, that provides protection against overcurrent, overcharge, and over-discharge and comes in a small SOT-23-6 package. It also has a very low quiescent current to prevent unnecessary battery drain.
DW01A Pinout Configuration
|
Pin Number |
Pin Name |
Pin Description |
|
1 |
OD |
Discharge control MOSFET gate pin |
|
2 |
CS |
Current sense and charger detect input |
|
3 |
OC |
Charge control MOSFET gate pin |
|
4 |
TD |
Delay time reduction test pin |
|
5 |
VCC |
Power supply pin |
|
6 |
GND |
IC ground reference |
Features and Specifications
- 4.3V ±50mV overcharge protection
- 3uA quiescent current
- Two overcurrent detection levels
- Internally generated delays
- Comes in the SOT-23-6 package
Note: Complete technical details can be found in the DW01A datasheet linked at the end of this page.
How To Use DW01A
The DW01A is an easy-to-use battery protection IC that combines the features of overvoltage, undervoltage, and overcurrent detection in one IC that comes in a compact SOT-23-6 package. This IC needs two external MOSFETs to switch the battery current, as well as a few passive components. Shown below is an example of a battery protection circuit diagram.
The overvoltage and undervoltage thresholds are set internally, at 4.3V and 2.4V respectively, and the release thresholds are 4.1V and 3.0V respectively. The overcurrent section depends on the on-resistance of the external MOSFETs. There is also a small delay time so that the IC does not false-trigger on short current bursts. The overcurrent threshold is 150mV and the short circuit threshold is 1.2V, measured with respect to ground. The formula for finding out the required ON Resistance for a given current trip point is:
RDS(ON) = VTH/(2*ITH)
Where RDS(ON) is the ON Resistance of the MOSFET, VTH is the overcurrent threshold voltage and ITH is the current limit threshold.
Applications
- Overvoltage, undervoltage, and overcurrent for single-cell lithium-ion battery
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