MAX745

PRODUCTION

Switch-Mode Lithium-Ion Battery-Charger

±0.75% Precision Li+ Charger Delivers 4A Without Heating

Data Sheet (Rev. 4) Product Selection Table
Part Models
2
1ku List Price
Starting From $6.92
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Part Details

  • Charges 1 to 4 Li+ Battery Cells
  • ±0.75% Voltage-Regulation Accuracy Using 1% Resistors
  • Provides up to 4A without Excessive Heating
  • 90% Efficient
  • Uses Low-Cost Set Resistors and N-Channel Switch
  • Up to 24V Input
  • Up to 18V Maximum Battery Voltage
  • 300kHz Pulse-Width Modulated (PWM) Operation
    • Low-Noise, Small Components
  • Stand-Alone Operation—No Microcontroller Needed
MAX745
Switch-Mode Lithium-Ion Battery-Charger
MAX745: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 2

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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
MAX1640
PRODUCTION Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier
MAX1647
PRODUCTION Chemistry-Independent Battery Chargers
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Evaluation Kits

MAX745EVKIT

Evaluation Kit for the MAX745

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Features and Benefits

  • Charges One to Four Li-Ion Cells
  • Low Heat/High Efficiency
  • 300kHz PWM Operation
  • 0.75% Overall Accuracy over Temperature
  • 6V to 24V Input Voltage Range
  • Proven PC Board Layout
  • Fully Assembled and Tested

Product Details

The MAX745 evaluation kit (EV kit) is an assembled and tested PC board that implements a step-down, switching power supply designed for charging lithium-ion (Li- Ion) batteries. The output voltage can be set for one to four cells. The cell voltage can be set between 4.0V and 4.4V, with 0.75% accuracy, using standard 1% resistors. Two LEDs indicate the charging status.

The MAX745 should be used to charge only Li-Ion battery packs. To charge other types of batteries, use the MAX1648 or the MAX712/MAX713. To charge SMBus™ smart-battery packs, use the MAX1645/MAX1647/ MAX1667.

Applications

  • Cell Phones
  • Desktop Cradle Chargers
  • Handheld Instruments (PDAs, Palmtops)
  • Li+ Battery Packs
  • Notebook Computers
MAX745EVKIT
Evaluation Kit for the MAX745

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