National Semiconductor LM3420-4.2, -8.2, -8.4, -12.6, -16.8 Lithium-Ion Battery Charge Controller Data Sheet
Summary
The LM3420 series is a high-precision integrated circuit designed for controlled charging and end-of-charge management of Lithium-Ion batteries. Available in compact SOT23-5 packages, this controller offers multiple fixed voltage options (e.g., 4.2V to 16.8V) with outstanding accuracy and low power consumption, making it ideal for sophisticated charger circuitry. This manual provides comprehensive technical data, including electrical specifications, operating limits, full functional diagrams, and ordering guidance necessary for engineers designing reliable, miniature battery management systems.
Manual Details
| Brand | National |
|---|---|
| Pages | 17 |
| File Size | 388.68 KB |
| Published | June 05, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What packaging package is the LM3420 available in?
It comes in a sub-miniature 5-lead SOT23-5 surface mount package.
Does this controller support multiple Li-Ion cell configurations?
Yes, it supports charging and end-of-charge control for 1, 2, 3, or 4 cells using fixed voltages (e.g., 4.2V, 8.2V/8.4V).
What is the maximum output current this device can drive?
It is capable of driving up to 15 mA of output current into external load designs.
How should I physically mount the LM3420 chip on a PCB?
Since it's surface-mount, ensure it is soldered to the PC board for best heat transfer.