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MAX1555

MAX1555

Maxim Integrated
Single-cell linear Li-Ion charger solution available in compact packages and rated for comparable charge currents.
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Overview

The MAX1555 is a single-cell linear Li-Ion battery charger IC from Maxim Integrated, offered in compact packages for space-constrained designs. It provides a simple, integrated charging solution for one-cell lithium-ion or lithium-polymer batteries and is intended for applications where a linear charge regulator is acceptable. The device is optimized for ease of use and minimal external components.

Why Choose This Part

The MAX1555 uses a linear charging architecture that requires few external components, simplifying PCB layout and reducing component count. Compact package options make it easy to integrate into space-constrained products, and linear regulation produces minimal switching noise, which helps sensitive analog or RF circuitry. Its simplicity reduces firmware complexity because no charging algorithm needs to be implemented on a host MCU.

Applications

Portable handheld devices
Provides single-cell battery charging in compact consumer or industrial handheld products where board space is limited.
IoT sensors and trackers
Charges a single Li-Ion cell in low-profile wireless sensors and asset trackers where simplicity and small footprint matter.
Wearables and fitness devices
Suitable for small wearable electronics that require straightforward charge control without switching noise.
Battery backup modules
Used to keep a single-cell backup battery charged in RTC modules, memory backup, and small power-hold circuits.

Getting Started

There are no IDEs or toolchains required for this passive IC; getting started means following the datasheet reference schematic and layout guidance. Begin by testing with a laboratory power supply and a proper single-cell Li-Ion battery or a suitable battery simulator, verify thermal performance on your PCB, and source any available Maxim/Analog Devices evaluation modules or reference designs if you want a known-good starting point.

Also Consider

MCP73831T-2ACI/OT MCHPMicrochip Technology - Very small, widely used single-cell linear Li-Ion charge controller with minimal external parts, ideal for low-cost, space-constrained designs.
LTC4054ES5-4.2 Analog Devices (Linear Technology) - Compact linear charger for single-cell Li-Ion batteries with proven reference designs and good layout guidance for small portable products.

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