CN3703 5A 3-Cell Li-ion Battery Charger Controller IC, TSSOP-16
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Prices updated: 13 Oct 2026
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About this product
A PWM switch-mode controller for charging 3-cell Li-ion battery packs in constant-current and constant-voltage modes. It regulates at 12.6 V ±1%, sets the charge current with a single external sense resistor, and trickle-charges deeply discharged cells at 15% of the programmed current.
Specifications
- Battery cells
- 3-cell Li-ion
- Constant voltage
- 12.6 V ±1%
- Charge current
- Up to 5 A, set by sense resistor
- Trickle charge threshold
- 8.4 V (15% of charge current)
- Package
- TSSOP-16 SMD
Frequently asked questions
How is the charging current set?
The constant charging current is programmed with a single external sense resistor. Calculate its value using the formula in the CN3703 datasheet.
Does it need external components?
Yes. As a PWM switch-mode controller it needs an external switching stage (such as MOSFETs, inductor and diodes) and the sense resistor. Follow the reference design in the datasheet.
