MAX77860 USB Type-C™ Switch-Mode Buck Charger

By Maxim Integrated 206

MAX77860 USB Type-C™ Switch-Mode Buck Charger

Maxim's MAX77860 is a high-performance single input switch-mode charger that features USB Type-C CC detection capability, reverse-boost capability, and a safeout LDO.

The switched-mode battery charger features two integrated switches and provides small inductor and capacitor sizes, programmable battery-charging current, and is ideal for portable devices such as smartphones, IoT devices, and other Li-Ion battery-powered electronics. The charger features a single input that works for USB and high-voltage adapters. The device supports USB Type-C CC detection under the BC 1.2 specification and the power path switch is integrated into the chip.

The MAX77860 blocks connected to the adapter/USB pin are protected from input overvoltage events up to 14 V. The USB-OTG output provides true-load disconnect and is protected by an adjustable output current limit. It has an input current limit up to 4.0 A and can charge a single-cell battery up to 3.15 A. The IC requires no additional inductors to power USB-OTG accessories when configured in reverse-boost mode. The switching charger is designed with a special CC, CV, and die temperature regulation algorithm, as well as I2C programmable settings to accommodate a wide range of battery sizes and system loads. The on-chip ADC helps monitor the charging input voltage/current, battery voltage, charging/discharging current, and the battery temperature.

The MAX77860 communicates through an I2C 3.0 compatible serial interface consisting of a bidirectional serial data line (SDA) and a serial clock line (SCL). The IC is available in a 3.9 mm x 4.0 mm, 81-bump (9 x 9 array), 0.4 mm pitch, wafer-level package (WLP).

Simplified Block Diagram

  • 1S Li-Ion applications
  • Mobile point-of-sale (POS) devices
  • Portable medical equipment
  • Portable industrial equipment
  • IoT devices
  • Smartphones
  • Up to 14 V protection
  • Input operating range: 4.0 V to 13.5 V
  • Switching charger with D+/D- charger detection
  • Adaptive input current limit (AICL): up to 4.0 A
  • Battery charging current limit: up to 3.15 A
  • Optional external sense resistor
  • CC, CV, and die temperature control
  • Supports USB-OTG reverse-boost: up to 1.5 A current limit
  • Master-slave charging capability: up to 6 A charge current
  • Integrated battery true-disconnect FET
  • Discharge current limit (programmable): up to 9 ARMS
  • USB Type-C detection:
    • Integrated VCONN switch
    • CC pin
    • D+/D- detection for USB HVDCP
    • BC 1.2 support
  • One safeout LDO
  • I2C compatible interface

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