MAX1641

PRODUCTION

Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier

High-Accuracy Current Sources Remain Cool While Fast Charging

Data Sheet (Rev. 2) Product Selection Table
Part Models
2
1ku List Price
Starting From $4.17
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Part Details

  • 95% Efficiency
  • +5.5V to +26V Input Supply Range
  • 2V to 24V Adjustable-Output Voltage Range
  • 100% Maximum Duty Cycle (Low Dropout)
  • Up to 500kHz PWM Operation
  • Optional Synchronous Rectifier
  • 16-Pin QSOP Package
  • Current-Sense Accuracy:
    • 2% (MAX1641)
    • 5.3% (MAX1640)
MAX1641
Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier
MAX1640, MAX1641: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

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Hardware Ecosystem

Parts Product Life Cycle Description
Linear Battery Chargers 1
MAX846A
PRODUCTION Cost-Saving, Multichemistry, Battery Charger System
Product 1
MAX1782
Advanced Smart Battery-Pack Controller
Switching Battery Chargers 2
MAX1647
PRODUCTION Chemistry-Independent Battery Chargers
MAX745
PRODUCTION Switch-Mode Lithium-Ion Battery-Charger
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Evaluation Kits

MAX1640EVKIT

Evaluation Kit for the MAX1640, MAX1641

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Features and Benefits

  • 5.5V to 26V Input Voltage Range
  • Tight Current-Regulation Accuracy:
    • 2% (MAX1641)
    • 5% (MAX1640)
  • Up to 1.5A Fast-Charge Current
  • Up to 500kHz PWM Operation
  • Pulse-Trickle Charge Current
  • 100% Maximum Duty Cycle (low dropout)
  • Synchronous Rectifier
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX1640 evaluation kit (EV kit) is an adjustable switch-mode current source that operates from a 5.5V to 26V input. It is intended for microprocessor-controlled battery chargers. The charging current, maximum voltage, and pulse-trickle charge are programmed with external resistors. The EV kit is shipped configured for a maximum charge voltage (6 cells). It is configured as a step-down pulse-width modulator (PWM) with synchronous rectification, allowing fast-charge currents up to 1.5A with greater than 90% efficiency. The MAX1640 uses high-side current sense; this allows the load to connect directly to ground, eliminating ground potential errors. The MAX1641 uses low-side current sense.

The MAX1640 EV kit is a fully assembled and tested surface-mount printed circuit board. It can also be used to evaluate the MAX1641.

Applications

  • Backup Battery Charger
  • Battery-Powered Applications
  • Cell Phones
  • Cordless Phones
  • Handy Terminals
  • Laptop, Notebook, and Palmtop Computers
  • PCS Phones
  • Portable Consumer Products
MAX1640EVKIT
Evaluation Kit for the MAX1640, MAX1641

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