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MAX745 - Switch-Mode Lithium-Ion Battery-Charger

General Description

The MAX745 provides all functions necessary for charging lithium-ion (Li+) battery packs.

It provides a regulated charging current of up to 4A without getting hot, and a regulated voltage with only ±0.75% total error at the battery terminals.

Key Features

  • 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 Ordering Inform.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Click here for production status of specific part numbers. MAX745 EVALUATION KIT AVAILABLE Switch-Mode Lithium-Ion Battery-Charger General Description The MAX745 provides all functions necessary for charging lithium-ion (Li+) battery packs. It provides a regulated charging current of up to 4A without getting hot, and a regulated voltage with only ±0.75% total error at the battery terminals. It uses low-cost, 1% resistors to set the output voltage, and a low-cost N-channel MOSFET as the power switch. The MAX745 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. The per-cell battery voltage regulation limit is set between 4V and 4.