ADILTC4054ES5-4.2#TRMPBF

Overview

The LTC4054ES5-4.2 is a single-cell linear lithium-ion / lithium-polymer battery charger in a TSOT-23-5 package with a fixed 4.2 V charge termination. It provides a programmable constant-current charge stage and automatic termination for low-cost, compact battery-powered designs. Its small SOT-23 footprint makes it suitable for space-constrained applications where low external component count is required.

Why Choose This Part

Small TSOT-23-5 package and a minimal external component count make the LTC4054ES5-4.2 easy to integrate into compact designs. Programmable charge current and built-in termination provide a reliable, low-cost single-cell charging solution without the complexity of switching regulators. As a linear charger, it is straightforward to design with but requires attention to thermal dissipation when input-to-battery voltage difference and charge current are large.

Applications

Getting Started

Start with the LTC4054 datasheet and the manufacturer reference schematic and layout recommendations. Choose the program resistor and required input/output capacitors per the datasheet to set the desired charge current and ensure stability. Verify thermal performance on your PCB (power is dissipated in the IC equal to (Vin - Vbat) * Icharge) and test with a current-limited bench supply and a charged/discharged battery to confirm charge termination behavior.

LTC4054ES5 Family

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