LTC4054E Single lithium-ion Battery Charging Management SMD IC SOT-23-5

Description

The LTC4054E is a complete, standalone linear charger for single-cell lithium-ion batteries, specifically designed for portable applications and USB power compatibility .

Key Specifications

Key Features

• No External Components Required: Internal MOSFET architecture eliminates the need for a sense resistor or blocking diode .

• Thermal Regulation: Automatically reduces charge current to prevent overheating during high-power operation or high ambient temperatures .

• Charge Termination: Automatically ends the charge cycle when current drops to 1/10th of the programmed value (C/10) .

• Trickle Charge: Features a 2.9V trickle charge threshold for deeply discharged batteries (LTC4054 variant) .

• Status Outputs: Includes a charge status pin and charge current monitor output .

• Low Standby Current: Drops to less than 2µA when input power is removed .

Pinout (SOT-23-5)

Programming Charge Current

The charge current is set by a single resistor (R_PROG) connected from the PROG pin to GND. The formula is: I_BAT = (1000V / R_PROG). For example, a 1.65kΩ resistor sets a 600mA charge current . The minimum recommended R_PROG value is 2kΩ (for 500mA)