This document is the datasheet of Micrel MIC79110 lithium ion battery charger. This charger has precision programmable current limiting (±5%) and precision voltage termination (±0.75% over temperature). It also has input voltage range of 2.5V to 16V and output voltage of 4.2V.
The MIC79110 is a simple, accurate 1‑cell Li‑ion battery charger IC that integrates a pass transistor, programmable current limiting, and a precision voltage termination. It offers a digital end‑of‑charge flag, an analog current‑proportional output, very low dropout (550 mV at 700 mA), thermal shutdown, reverse polarity and reverse‑current protection, all in a tiny 10‑pin 3 mm × 3 mm MLF package.
Typical applications include cellular phones, PDAs, digital cameras, camcorders, MP3 players, notebook PCs, portable meters, cradle chargers, car chargers and battery packs. The device is supplied in both fixed 4.2 V and adjustable‑output versions and operates from –40 °C to +125 °C.
| Input voltage range | 2.5 V to 16 V |
|---|---|
| Maximum charge current | 1.2 A |
| Dropout voltage (700 mA load) | 550 mV |
| Output voltage accuracy | ±0.75 % over –5 °C to +60 °C |
| Junction temperature range | ‑40 °C to +125 °C |
| Package | 10‑Pin 3 mm × 3 mm MLF |
The device operates with an input voltage from 2.5 V up to 16 V.
The current limit is programmed by connecting a resistor to the RSET pin; the limit is calculated as I_RSET = (0.2 V / RSET) × 1000.
Pin 8, labeled DEOC, is an open‑drain digital end‑of‑charge output that goes high‑impedance when charging is complete.
The dropout voltage is 550 mV when the charger supplies 700 mA.