MAX77831

2.5V to 16V Input, 18W Output High-Efficiency Buck-Boost Converter

Smallest Solution Size to Achieve 18W USB OTG Power


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Description

The MAX77831 is a high-efficiency, high-performance buck-boost converter targeted for systems requiring wide input voltage range (2.5V to 16V). It can supply 18W of continuous output power (for example, up to 2A at 9V (VIN ≥ 4V)).

The IC is available in 5V default output voltage when using internal feedback resistors. The IC 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 IC only operates in forced-PWM (FPWM) mode.

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.

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

The MAX77831 is available in a 2.86mm x 2.06mm 35-bump wafer level package (WLP).

MAX77831: Functional Diagram MAX77831: Functional Diagram Enlarge+

Key Features

  • Wide Input Voltage Range: 2.5V to 16V
  • Default Output Voltage
    • 5V with Internal Feedback Resistors
    • 3V to 15V with External Feedback Resistors
  • Default 1.8MHz Switching Frequency
    • 1.5MHz and 1.2MHz Selectable through the I2C Interface
  • Forced-PWM (FPWM) Mode Operation Only
  • I2C-Programmable Output Voltage After Startup
    • 4.5V to 15V (Internal Feedback Resistors)
    • 3V to 15V (External Feedback Resistors, See Table 1)
  • 18W of Continuous Output Power (VIN ≥ 4V, VOUT ≥ 5V)
  • 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
    • Power-OK (POK) Status and Fault Interrupt Masks
    • Internal Compensation
  • Soft-Start
  • Output Active Discharge
  • Open-Drain Power-OK (POK) Monitor/Fault Condition Interrupt (MAX77831B/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 2.86mm x 2.06mm 35 WLP

Applications/Uses

  • Non-Battery Powered Applications up to 16V Input
  • Battery Powered Applications up to 16V Input with EN Control

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.

MAX77831WEVKIT: Evaluation Kit for the MAX77831
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