Overview

General Description

The MAX77757 is a standalone 3.15A charger with integrated USB Type-C® CC detection with JEITA compliance that supports reverse boost capability. The fast-charge current is easily configured with resistors. The MAX77757 operates with an input voltage of 4.5V to 13.7V and has a maximum input current limit of 3A. The IC also implements the adaptive input current limit (AICL) function that regulates the input voltage by reducing input current to prevent the voltage of a weak adapter from collapsing or folding back.

The USB Type-C Configuration Channel (CC) detection pins on the MAX77757 enable automatic USB Type-C power source detection and input current limit configuration. To support a variety of legacy USB types as well as proprietary adapters, the IC also integrates BC1.2 detection using the D+ and D- pins. The IC runs the CC pin and BC1.2 detection automatically as soon as a USB plug is inserted without any software control.

The IC also offers reverse-boost capability up to 5.1V and 1.5A, which can be enabled with the ENBST pin. The STAT pin indicates charging status while the INOKB pin indicates valid input voltage. Charging can be stopped by pulling the THM pin low.

The MAX77757 is equipped with a Smart Power Selector™ and a battery true-disconnect FET to control the charging and discharging of the battery or to isolate the battery in case of a fault. The MAX77757 is offered in several variants to support Li-ion batteries with various termination voltages from 4.1V to 4.5V. It also has a 3.6V termination voltage option for LiFePO4 batteries. The IC comes in a 3mm x 3mm, 0.4mm pitch, 24-lead FC2QFN package making it suitable for low-cost PCB assembly.
Simplified Block Diagram

Benefits and Features
    • Up to 16V Protection
    • 13.7V Maximum Input Operating Voltage
    • 3.15A Maximum Charging Current
    • 6A Discharge Current Protection
      • No Firmware or Communication Required
      • Integrated CC Detection for USB Type-C
      • Integrated BC1.2 Detection for Legacy SDP, DCP, CDP, and DCD Timeout
      • Integrated USB Detection for Common Proprietary Charger Types
      • Automatic Input Current Limit Configuration
      • Input Voltage Regulation with Adaptive Input Current Limit (AICL)
    • Reverse Boost Capability up to 5.1V, 1.5A
    • Termination Voltage
      • 4.1V to 4.5V for Li-ion and Li-poly Batteries
      • 3.6V/3.7V for LiFePO4 Battery
    • Safety
      • Charge Safety Timer
      • JEITA Compliance with NTC Thermistor
        (MAX77757J)
      • HOT/COLD Stop Charging with NTC Thermistor
        (MAX77757H)
      • Thermal Shutdown
    • Pin Control of All Functions
      • Resistor Configurable Fast-Charge Current
      • ENBST Pin to Enable and Disable Reverse Boost
      • STAT Pin to Indicate Charging Status
      • INOKB Pin to Indicate Input Power-OK
      • THM Pin to Disable Charge
    • Integrated Power Path
    • Integrated Battery True-Disconnect FET
    • 3mm x 3mm, 24-Lead FC2QFN Package

    Ordering Information appears at end of data sheet.

    Applications
      • Mobile Point-of-Sale (mPOS) Terminals
      • Portable Medical Devices
      • Wireless Headphones
      • GPS Trackers
      • Charging Cradles for Wearable Devices
      • Power Banks
      • Mobile Routers


      USB Type-C is a registered trademark of USB Implementers Forum.

      Smart Power Selector is a trademark of Maxim Integrated Products, Inc.

      Apple is a registered trademark of Apple Inc.

      Samsung is a registered trademark of Samsung Electronics Co., Ltd.


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