3.15A USB Type-C Autonomous Charger for 1-Cell Li+ Batteries

Industry's First Autonomous Charger with Integrated USB Type-C Detection

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The MAX77751 is a standalone, 3.15A charger with integrated USB Type-C® CC detection and reverse boost capability. The fast-charge current and top-off current thresholds are easily configured with resistors. The MAX77751 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 MAX77751 enable automatic USB Type-C power source detection and input current limit configuration. To support a variety of legacy USB as well as proprietary adapters, the IC also integrates BC1.2 detection using the D+ and D- pins. The IC runs the CC detection and BC1.2 detection automatically without any software as soon as the USB plug is inserted.

The IC also offers Reverse-Boost capability up to 5.1V, 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 ITOPOFF pin low.

The MAX77751 is equipped with a Smart Power Selector™ and a battery true-disconnect FET to control the charging and discharging of the battery or isolate the battery in case of a fault. The MAX77751 is offered in several variants to support Li-ion batteries with various termination voltages from 4.1V to 4.5V. The IC comes in a 3mm x 3mm, 0.4mm pitch 24-lead FC2QFN package making it suitable for low-cost PCB assembly.
MAX77751: Simplified Block Diagram MAX77751: Simplified Block Diagram Enlarge+

Key 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 USB Detection
    • CC Detection for USB Type-C
    • BC1.2 Detection for Legacy SDP, DCP, and CDP
    • Automatic Input Current Limit Configuration
    • Input Voltage Regulation with Adaptive Input Current Limit (AICL)
  • Reverse Boost Capability up to 5.1V, 1.5A
  • Pin Control of All Functions
    • Resistor-Configurable Fast-Charge Current
    • Resistor-Configurable Top-Off Current
    • ENBST Pin to Enable and Disable Reverse Boost
    • STAT Pin to Indicate Charging Status
    • INOKB Pin to Indicate Input Power-OK (POK)
    • ITOPOFF Pin to Disable Charge
  • Integrated Battery True-Disconnect FET
  • 3mm x 3mm, 24 Lead FC2QFN Package


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

See parametric specs for Battery Chargers (75)

Part NumberCharging VIN
Cell Chemistry# Lithium Ion Cells
MAX77751 NEW!143.15

See parametric specs for USB Charger Detectors (13)

Part Number
MAX77751 NEW!

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX77751CEVKIT: Evaluation Kit for the MAX77751
MAX77751FEVKIT: Evaluation Kit for the MAX77751
Request Reliability Report for: MAX77751 
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Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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