MAX1736

19-1662; Rev 1; 10/00 KIT ATION EVALU E L B AVAILA SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply General Description Features o Small 6-Pin SOT23 Package o Stand-Alone or µP-Controlled Operation o 0.5% Voltage Set-Point Accuracy o Lowest Power Dissipation o Low 4.7V min Input Voltage o Top-Off Charging to Achieve Full Battery Capacity o No Inductor Required o Safely Precharges Near-Dead Cells o Automatic Power-Down when Input Power Removed MAX1736 The MAX1736 is a simple, low-cost, single-cell lithiumion (Li+) battery charger for small hand-held applications. When accompanied by a current-limited voltage source (such as a wall cube), the MAX1736 provides simple, accurate charging and termination control for single-cell Li+ batteries. The MAX1736EUT42 is preset to a 4.2V battery regulation voltage, while the MAX1736EUT41 is preset to 4.1V. The MAX1736 initiates charging in one of four ways: battery insertion, charger power-up, battery voltage threshold, and by external manipulation of the EN pin. The device features an internal precharge current source that safely charges near-dead cells, as well as input-supply detection that shuts down the MAX1736 when the supply is removed to minimize battery current drain. The MAX1736 accepts input voltages up to 22V, making it compatible with a wide range of input supplies. It has a single control input yet offers stand-alone and microprocessor-controlled operation. The MAX1736 is packaged in a small SOT23-6 packag...