MAX1772

PRODUCTION

Low-Cost, Multichemistry Battery-Charger Building Block

0.7% Accurate, Input-Current-Limited, Multichemistry Battery Charger Offers Most Complete Solution

Data Sheet (Rev. 4) Product Selection Table
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Overview

  • Input Current Limiting
  • ±0.5% Output Voltage Accuracy Using Internal Reference (0°C to +85°C)
  • Programmable Battery Charge Current >4A
  • Analog Inputs Control Charge Current and Charge Voltage
  • Monitor Outputs for:
    • Current Drawn from AC Input Source
    • Charging Current
    • AC Adapter Present
  • Up to 18.2V (max) Battery Voltage
  • 8V to 28V Input Voltage
  • >95% Efficiency
  • 99.99% (max) Duty Cycle for Low-Dropout Operation
  • Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.

The MAX1772 is a highly-integrated, multichemistry battery-charger control IC that simplifies the construction of accurate and efficient chargers. The MAX1772 uses analog inputs to control charge current and voltage and can be programmed by the host or hardwired. High efficiency is achieved by a buck topology with synchronous rectification.

Maximum current drawn from the AC adapter is programmable to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. This enables the user to reduce the cost of the AC adapter. The MAX1772 provides outputs that can be used to monitor the current drawn from the AC adapter, battery-charging current, and the presence of an AC adapter.

The MAX1772 can charge two to four lithium-ion (Li+) series cells, easily providing 4A. When charging, the MAX1772 automatically transitions from regulating current to regulating voltage. It is available in a space-saving 28-pin QSOP package.

Applications

  • Handheld Terminals
  • Notebook and Subnotebook Computers
  • PDAs and Other Handheld Devices
MAX1772
Low-Cost, Multichemistry Battery-Charger Building Block
MAX1772: Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 2

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Battery Charger ICs 1
MAX1645A
Advanced-Chemistry-Independent, Level-2 Battery Chargers with Input Current Limiting
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Evaluation Kits

MAX1772EVKIT

Evaluation Kit for the MAX1772

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Features and Benefits

  • Input Current Limiting
  • ±0.7% Output Voltage Accuracy
  • Analog Inputs Control Charge Current and Charge Voltage
  • Monitor Outputs for:
    • Current Drawn from AC Input Source
    • Charging Current
    • AC Adapter Presence
  • Up to 18.2V Battery Voltage
  • +8V to +28V Input Voltage
  • 4A (max) Battery Charge Current
  • Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
  • Fully Assembled and Tested
  • Surface-Mount Components

Product Details

The MAX1772 evaluation kit (EV kit) is an accurate and efficient multichemistry battery charger. It uses analog inputs to control charge voltage and current. The EV kit can charge any battery with charge current up to 4A. High efficiency is achieved by a buck topology with synchronous rectification. The EV kit provides outputs that can be used to monitor the input current, battery charging current, and the presence of an AC adapter.

The MAX1772 EV kit is a fully assembled and tested surface-mount printed circuit (PC) board.

Applications

  • Battery Chargers
  • Cell Phones
  • Cordless Phones
  • Digital Still Cameras
  • Notebook Computers
  • Palmtop Computers
  • Pen Entry Palmtops
  • Smart Battery Packs/Chargers
MAX1772EVKIT
Evaluation Kit for the MAX1772

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