MAX1925

PRODUCTION

Switch-Mode 1-Cell Li+ Chargers

Smallest, Simplest Switch-Mode Li+ Charger in 4mm x 4mm QFN Package

Data Sheet (Rev. 1) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.24

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Overview

Small (4mm x 4mm) Package

4.25V to 12V Input Range (MAX1926)

Overvoltage Lockout at 6.1V (MAX1925)

±0.75% Battery Regulation Voltage

Set Charge Current with One Resistor

Automatic Input Power Sense

LED (or Logic-Out) Charge Status and Fault Indicator

Programmable Safety Timer

Autorestart at Cell = 4V

Thermistor Monitor Input

The MAX1925/MAX1926 single-cell lithium-ion (Li+) switch-mode battery chargers use an external PMOS pass element step-down configuration. Charge current is programmable, and an external capacitor sets the maximum charge time.

Additional features include automatic input power detection (active-low ACON output), logic-controlled enable, and temperature monitoring with an external thermistor. The MAX1925 disables charging for inputs greater than 6.1V, while the MAX1926 charges for inputs between 4.25V and 12V.

The MAX1925/MAX1926 feature two precondition levels to restore near-dead cells. The devices source 4mA to a cell that is below 2V while sourcing C/10 to a cell between 2V and 3V. Full charge current is then applied above 3V. A active-low CHG output drives an LED to indicate charging (LED on) and fault conditions (LED blinking).

The MAX1925/MAX1926 are available in a 12-pin 4mm x 4mm thin QFN package and are specified over the extended temperature range (-40°C to +85°C). An evaluation kit is available to speed design.

Applications

Cradle Chargers
Digital Still Cameras
PDAs
Self-Charging Battery Packs

Part Models: 2
1ku List Price: Starting From $2.24

Documentation

Data Sheet 1

MAX1925-MAX1926: Switch-Mode 1-Cell Li+ Chargers Data Sheet (Rev.1) 11/15/2002

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1925ETC+	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1925ETC+T	Thin Quad Flatpack, No Leads	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 20, 2016 - 1612 ASSEMBLY
		pcn_1612
MAX1925ETC+	PRODUCTION
MAX1925ETC+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Kit for the MAX1925, MAX1926

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Features and Benefits

5V to 12V Input Voltage Range
Up to 1A Fast Charge Current
LED Charge Status and Fault Indicator
12-Pin Thin QFN Package
Surface-Mount Construction
Fully Assembled and Tested

Product Details

The MAX1926 evaluation kit (EV kit) is a complete, fully assembled and tested, single-cell lithium-ion (Li+) battery charger. The EV kit provides a 4.2V output from input as high as 12V, and delivers up to 1A charge current. A light-emitting diode (LED) indicates the cell's charging status.

The EV kit can be also used to evaluate the MAX1925, which is a single-cell Li+ battery charger with a 4.5V to 6.1V input voltage charge range.