LT1511 Datasheet PDF - Linear Technology

●DESCRIPTION

●With switching frequency as high as 500kHz, The LT®1510 current mode PWM battery charger is the smallest, simplest, most efficient solution to fast-charge modern rechargeable batteries including lithium-ion (Li-Ion), nickel metal-hydride (NiMH)

● and nickel-cadmium (NiCd)

● that

●require constant-current and/or constant-voltage charging. The internal switch is capable of delivering 1.5A DC current (2A peak current). The 0.1Ωonboard current sense resistor makes the charging current programming very simple. One resistor (or a programming current from

●a DAC) is required to set the full charging current (1.5A) to within 5% accuracy. The LT1510 with 0.5% reference voltage accuracy meets the critical constant-voltage charging requirement for lithium cells.

●FEATURES

●■ Charges NiCd, NiMH and Lithium-Ion Batteries - Only One 1/10W Resistor Is Needed to Program Charging Current

●■ High Efficiency Current Mode PWM with 1.5A Internal Switch and Sense Resistor

●■ 3% Typical Charging Current Accuracy

●■ Precision 0.5% Voltage Reference for Voltage Mode Charging or Overvoltage Protection

●■ Current Sensing Can Be at Either Terminal of the Battery

●■ Low Reverse Battery Drain Current: 3µA

●■ Charging Current Soft Start

●■ Shutdown Control

●■ 500kHz Version Uses Small Inductor

●APPLICATIONS

●■ Chargers for NiCd, NiMH and Lithium Batteries

●■ Step-Down Switching Regulator with Precision Adjustable Current Limit