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Maxim > Products > [Power and Battery Management] 
MAX1925, MAX1926
Switch-Mode 1-Cell Li+ Chargers

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


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 448kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-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

    Key Specifications:  Battery Chargers
    Part Number Cell Chemistry Lithium Ion Cells Protected VIN
    (V)    		 Charging VIN
    (V)    		 Charge Rate Set by Max. ICHG
    (A)    		 Charge Termination Charge Regulation Features EV Kit Package/Pins Smallest Available Pckg.
    (mm2)    		 Oper. Temp.
    (°C)    		 Price
    max max ≥ max w/pins See Notes
    MAX1925 
    Li-Ion
    Li-Polymer
    		 1 12 12 Resistor 2 Timer Switchmode
    Stand Alone
    Thermistor Input
    Timer
    		 Yes
    TQFN/12
    		 17 -40 to +85 $1.70 @1k
    MAX1926  6.1
    TQFN/12
    		 $1.70 @1k
    See All Battery Chargers (62)

    Diagram
    MAX1925, MAX1926: Typical Operating Circuit
    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
  		• Battery Management (PDF)
  		• Power Management for Battery-Powered Equipment (PDF)

    Reliability Reports
  		• Reliability Report: MAX1926.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * 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;17 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;17 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;17 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;17 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;17 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;17 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;17 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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     Description 
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     Diagram 

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    Document Ref.: 19-2556; Rev 1; 2002-11-15
    This page last modified: 2007-07-13


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