Li-Ion/Li-Polymer Battery Charger—LTM8061

The LTM ^® 8061 is a high efficiency, 32V, 2A μModule ^® stand-alone Li-Ion battery charger. The device is optimized for single-cell and two-cell battery stacks with fixed float voltage options: 4.1V, 4.2V, 8.2V and 8.4V. The LTM8061 provides a constant current/constant voltage charging feature with a maximum charge current of up to 2A. A preconditioning feature trickles charges a dead battery, and a bad battery detection feature signals and suspends charging if the battery does not respond to preconditioning.

The LTM8061 can be configured to terminate charging when the charge current decreases to 1/10 of the set maximum current, or an internal timer can be used if a time-based charge termination scheme is desired. Once charging is terminated, the LTM8061 enters a low current standby mode. If the battery voltage drops 2.5% from the float voltage, or a new battery is inserted into a charging system, the automatic restart function will start a new charging cycle.

The LTM8061 is available in a thermally enhanced, compact (9mm × 15mm × 4.32mm) overmolded land grid array (LGA) package suitable for automated assembly using standard surface mount equipment. The LTM8061 is RoHS compliant.

Features

Wide input voltage range: 4.95V to 32V (40V absolute maximum)

Float voltage options:

Single battery : 4.1V, 4.2V

Two batteries : 8.2V, 8.4V

Programmable charge current: up to 2A

User - selectable charge termination: C/10 or on-board charge termination timer

Dynamic charge rate programming/soft start pin

Programmable input current limit

Optional reverse input protection

NTC Resistor Temperature Monitor

0.5 % float voltage accuracy

Failed battery detection with automatic reset

Tiny , low-profile (9mm × 15mm × 4.32mm) surface-mount LGA package

Encapsulation

Typical Applications