High–Efficiency Buck–Boost Regulator

2A High-Efficiency Buck and Boost Operating Including Seamless Transition Between Buck and Boost Mode

Please check latest availability status for a specific part variant.


The MAX77801 is a high-current, high-efficiency buck-boost targeted to mobile applications that use a Li-ion battery or similar chemistries. The MAX77801 utilizes a four-switch H-bridge configuration to support buck and boost operating modes. Buck-boost provides 2.60V to 4.1875V of output voltage range and up to 2A output current.

A unique control algorithm allows high efficiency, outstanding performances in line/load transient response, and seamless transition between buck and boost modes.

DVS (dynamic voltage scaling) input allows the host processor to switch between two preprogrammed output voltages. This feature minimizes power loss for given load conditions. The ramp-up and ramp-down slew rates are programmable through I²C.

The MAX77801 features I²C-compatible, 2-wire serial interface consisting of a bidirectional serial-data line (SDA) and a serial-clock line (SCL). It supports SCL clock rates up to 3.4MHz.

MAX77801: Typical Application Circuit High efficiency, high current buck boost regulator with I2C interface typical application circuit Enlarge+

Key Features

  • 2A High-Efficiency Buck and Boost Operation Including Seamless Transition Between Buck and Boost Mode
  • Flexibility Supports Various Designs
    • VOUT Range from 2.60V to 4.1875V with 12.5mV Step
    • High-Speed (Up to 3.4MHz) I²C Serial Interface
  • Low Quiescent Current, High Efficiency, and Dynamic Voltage Scaling Enable System to Be More Efficient
    • DVS Input
    • Up to 97% of Peak Efficiency
    • 55μA Quiescent Current
  • High Switching Frequency and Small Package Reduce Solution Size
    • 2.5MHz Switching Frequency
    • Available in WLP and TQFN Packages
  • Safety Features Enhance Device and System Reliability
    • POK Output
    • Soft-Start
    • True Shutdown™
    • Thermal Shutdown and Short-Circuit Protection


  • Battery-Powered Applications
  • Smartphones and Tablets
Part Number VIN
Preset VOUT
VOUT1 Tolerance
Output Adjust. Method Switch Type Synchronous Switching Power Good Signal ICC
DC-DC Outputs Alternate Topology Oper. Freq.
Design Tools Package/Pins Oper. Temp.
min max min max max max max See Notes
MAX77801  2.3 5.5 2.6 4.1875
1 2 2 Preset Internal Yes Yes 0.07 1
2500 EE-Sim
-40 to +85 $1.10 @1k
See All Step-Down/Up Switching Regulators (17)
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.

MAX77801EVKIT: Evaluation Kit for MAX77801

Technical Documents

Tutorial 660 Regulator Topologies for Battery-Powered Systems

Quality and Environmental Data

Product Reliability Reports: MAX77801.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • EE-Sim: Design & Simulate MAX77801
  • Software
    MAX77801 Evaluation Kit Software  
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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.

    Quality Management System >
    Environmental Management System >

    Related Resources

    12-Channel, High-Voltage Smart Sensor Data-Acquisition Interface

    • 12-Cell Battery-Voltage Measurement for Lithium-Ion, NiMH, or Super-Cap Cells
    • Two Auxiliary Analog Inputs for NTC Thermistor or Absolute Voltage Measurement
    • Die Temperature Measurement and alert

    Wearable Power Management Solution

    • Extend Battery Use Time Between Battery Charging
    • Easy-to-Implement Li+ Battery Charging
    • Minimize Solution Footprint Through High Integration

    USB Type-C Charger

    • Minimize Power Management Footprint Through High Integration
    • Easy-to-Implement Li+ Battery Charging
    • Automatic Input Current Limit (AICL) Power Management