2.5V to 16V Input, 7A Switching Current High-Efficiency Buck-Boost Converter

The MAX77831 is a high-efficiency, high-performance buck-boost converter targeted for systems requiring wide input voltage range (2.5V to 16V). It features a 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).

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.

The I2C serial interface is optional and allows dynamically controlling the output voltage, the 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 2.83mm x 2.03mm 35-bump wafer level package (WLP).

Applications

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

* 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 2)

* 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 * 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