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Maxim > Products > [Power and Battery Management] 
MAX1612, MAX1613
Bridge Battery Backup Controllers for Notebooks

Reduce the Number of Backup (Bridge) Battery Cells in Notebooks with Backup Controller


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 144kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1612/MAX1613 manage the bridge battery (sometimes called a hot-swap or auxiliary battery) in portable systems such as notebook computers. They feature a step-up DC-DC converter that boosts 2-cell or 3-cell bridge-battery voltages up to the same level as the main battery. This voltage boosting technique reduces the number of cells otherwise required for a 6-cell plus diode-OR bridging scheme, reducing overall size and cost. Another key feature is a trickle-charge timer that minimizes battery damage caused by constant charging and eliminates trickle-charge current drain on the main battery once the bridge battery is topped off.

These devices contain a highly flexible collection of independent circuit blocks that can be wired together in an autonomous stand-alone configuration or used in conjunction with a microcontroller. In addition to the boost converter and charge timer, there is a micropower linear regulator (useful for RTC/CMOS backup as well as for powering a microcontroller) and a high-precision low-battery detection comparator.

The two devices differ only in the preset linear-regulator output voltage: +5.0V for the MAX1612 and +3.3V for the MAX1613. Both devices come in a space-saving 16-pin QSOP package.

An evaluation kit is available:  MAX1612EVKIT  

Key Features   Applications/Uses
  • Reduce Battery Size and Cost
  • Four Key Circuit Blocks
    • Adjustable Boost DC-DC Converter
    • NiCd/NiMH Trickle Charger
    • Always-On Linear Regulator (+28V Input)
    • Low-Battery Detector
  • Low 18µA Quiescent Current
  • Selectable Charging/Discharging Rates
  • Preset Linear-Regulator Voltage
    • 5V (MAX1612)
    • 3.3V (MAX1613)
  • 4V to 28V Main Input Voltage Range
  • Internal Switch Boost Converter
  • Small 16-Pin QSOP Package

 
  		• Backup Battery Applications
  		• Notebook Computers
  		• Portable Equipment

    Key Specifications:  Battery Chargers
    Part Number Cell Chemistry NiMH/ NiCd Cells Protected VIN
    (V)    		 Charging VIN
    (V)    		 Charge Rate Set by Charge Termination Charge Regulation Features EV Kit Package/Pins Smallest Available Pckg.
    (mm2)    		 Oper. Temp.
    (°C)    		 Price
    max max max w/pins See Notes
    MAX1612 
    NiCd
    NiMH
    2
    3
    		 28 28 Resistor Timer Linear
    Internal FET/Transistor
    Stand Alone
    Timer
    		 Yes
    QSOP/16
    		 31 -40 to +85 -
    MAX1613 
    QSOP/16
    		 -
    See All Battery Chargers (62)

    Diagram
    MAX1612, MAX1613: Typical Operating Circuit
    Typical Operating Circuit

    Evaluation Kits
  		• MAX1612EVKIT

    Reliability Reports
  		• 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

    MAX1612 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1612EEE    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1612EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1612EEE+  
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1612EEE+T    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1613 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1613EEE    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1613EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX1613EEE+  
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1613EEE+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    Notes and Comments
    • Stand-Alone or µC Assisted Operation

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    Document Ref.: 19-4785; Rev 0; 1998-11-12
    This page last modified: 2007-07-20


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