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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 448kB) Download   E-Mail

Description

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.

An evaluation kit is available:  MAX1926EVKIT  

Key Features		Applications/Uses
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		Cradle Chargers Digital Still Cameras PDAs Self-Charging Battery Packs

Diagram

Typical Operating Circuit

Application Notes

Application Note 680: How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues - MAX1926

Evaluation Kits

MAX1926EVKIT

Design Guides

Power Management for Battery-Powered Equipment (PDF)

Reliability Reports

Reliability Report: MAX1926.pdf Show FIT data for: MAX1925 MAX1926 Request Reliability Report for: MAX1925

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

MAX1925	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1925ETC+			Active	TQFN;12 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1925ETC+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1925ETC			Active	TQFN;12 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1925ETC-T			Active	TQFN;12 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1926	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1926ETC			Active	TQFN;12 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1926ETC-T			Active	TQFN;12 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1926ETC+			Active	TQFN;12 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1926ETC+T			Active	TQFN;12 pin;16.8 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0068 (PDF) Use pkgcode/variation: T1244+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes and Comments

The MAX1925/MAX1926 are low-cost and simple charging solutions for 1-cell Li+ batteries.

More Information

Topmark Coding: MAX1925 MAX1926 New Product Press Release 2002-09-16

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