DESCRIPTION

The LT®1769 current mode PWM battery charger is a simple, efficient solution to fast charge modern rechargeable batteries including lithium-ion (Li-Ion), nickel-metalhydride (NiMH) and nickel-cadmium (NiCd) that require constant-current and/or constant-voltage charging. The internal switch is capable of delivering 2A** DC current (3A peak current). Charge current can be programmed by resistors or a DAC to within 5. With 0.5 reference voltage accuracy, the LT1769 meets the critical constant-voltage charging requirement for Li-Ion cells.

FEATURES

■ Simple Solution to Charge NiCd, NiMH and Lithium Rechargeable Batteries—Charging Current Programmed by Resistors or DAC

■ Adapter Current Limit Allows Maximum Possible Charging Current During System Use*

■ Precision 0.5 Accuracy for Voltage Mode Charging

■ Available in 20-Lead Exposed Pad TSSOP and 28-Lead Narrow SSOP Packages

■ High Efficiency Current Mode PWM with 3A Internal Switch

■ 5 Charge Current Accuracy

■ Adjustable Undervoltage Lockout

■ Automatic Shutdown When AC Adapter is Removed

■ Low Reverse Battery Drain Current: 3µA

■ Current Sensing Can Be at Either Terminal of the Battery

■ Charging Current Soft Start

■ Shutdown Control

APPLICATIONS

■ Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries

■ Switching Regulators with Precision Current Limit