Features and Benefits

  • Wide Input Voltage Range: 2.5V to 16V
  • Default Output Voltage
    • 5V with Internal Feedback Resistors
    • 3V to 15V with External Feedback Resistors
  • I2C-Programmable Output Voltage after Startup
    • 4.5V to 15V with Internal Feedback Resistors
    • 3.0V to 15V with External Feedback Resistors, See Table 1
  • Maximum Output Current
    • Buck Mode: Up to 6A
    • Boost Mode: Up to 4A (Boost Ratio ≤ 1.3)
  • 7A Typical Switching Current
  • RSEL Configuration
    • I2C Interface Slave Address
    • Switching Current Limit Threshold
    • Internal/External Feedback Resistors
  • I2C Programming
    • Output Voltage (DVS)
    • Slew Rate of Output Voltage Change
    • Switching Current Limit Threshold
    • Switching Frequency
    • Forced PWM Mode Operation (FPWM)
    • Power-OK (POK) Status and Fault Interrupt Masks
  • Soft-Start
  • Output Active Discharge
  • Open-Drain Power-OK (POK) Monitor and Fault Condition Interrupt (MAX77857B/C Only)
  • Protection Features
    • Undervoltage Lockout (UVLO)
    • Overcurrent Protection (OCP)
    • Overvoltage Protection (OVP)
    • Thermal Shutdown (THS)
  • High Density Interconnect (HDI) PCB not Required (See the PCB Layout Guideline section)
  • Available in 2.83mm x 2.03mm 35 WLP or 31 WLP or 3.5mm x 3.5mm 16 FC2QFN

Product Details

The MAX77857 is a high-efficiency, high-performance buck-boost converter targeted for systems requiring a wide input voltage range (2.5V to 16V). It features 7A switching current and can supply up to 6A output current in buck mode and up to 4A in boost mode (Boost Ratio ≤ 1.3). It operates in PWM mode and implements an automatic SKIP mode to improve light-load efficiency.

The default output voltage is 5V when using internal feedback resistors. It can also be configured to any default output voltages between 3V and 15V when using external feedback resistors. The output voltage is adjustable dynamically through the I2C serial interface (see the Output Voltage Configuration section).

The SEL pin allows a single external resistor to program four different I2C interface slave addresses, four different switching current limit thresholds, and selection between external/internal feedback resistors. The different switching current limit thresholds allow the use of lower profile and smaller external components that are optimized for a particular application. The use of external feedback resistors allows for a wider output voltage range and customizable output voltages at startup.

The I2C serial interface is optional and allows for dynamically controlling the output voltage, slew rate of the output voltage change, switching-current limit threshold, switching frequency, and forced PWM mode operation. The I2C-programmed settings have priority over the RSEL decoded settings.

The MAX77857 is available in a 2.83mm x 2.03mm, 35-bump and 31-bump wafer-level package (WLP) and a 3.5mm x 3.5mm, 16-lead Flip Chip QFN package (FC2QFN).


  • USB Power Delivery (USB-PD) OTG
  • Qualcomm® Quick ChargeTM
  • USB VBUS Supply and DRP (Dual Role Power) Ports
  • DSLR, DSLR Lens
  • Display Power
  • Up to 3-Cell Li-Ion Battery Applications
  • Notebook Computer, Tablet PC

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Tools & Simulations

EE-Sim Power® Tools

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator, featuring SIMPLIS and SIMetrix SPICE engines.


Software Development

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.



Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help


Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.