MAX77831

RECOMMENDED FOR NEW DESIGNS

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

Smallest Solution Size to Achieve USB PD OTG Power

Data Sheet (Rev. 3) Product Selection Table

Part Models: 2
1ku List Price: Starting From $0.90

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Overview

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
R_SEL 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

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 R_SEL 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

Part Models: 2
1ku List Price: Starting From $0.90

Documentation

Data Sheet 1

MAX77831: 2.5V to 16V Input, 7A Switching Current High-Efficiency Buck-Boost Converter Data Sheet (Rev.3) 10/22/2021

Technical Articles 2

Buck-Boost Enables High Power Density and Higher System Efficiency for Systems with Back-Up Battery 03/05/2021

How to Create a Compatible Power Rail for MAX77831's VIO Pin 04/02/2021

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX77831BEWB+	35-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX77831BEWB+T	35-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 23, 2022 - 2291 TEST
		pcn_2291
MAX77831BEWB+	PRODUCTION
MAX77831BEWB+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

Software Development 1

MAX77831B Evaluation Kit Software, 1.0.0

EE-Sim Power® Tools 1

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.

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Evaluation Kits

Evaluation Kit for the MAX77831

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Features and Benefits

Proven PCB Reference Design and Layout Benefit
Fully Assembled and Tested
Sense Points for High-Accuracy Measurements
Accessible Test Point Pins for EN, POKB/INTB, VIO, and the I²C Serial Interface SCL, SDA
MAXUSB_INTERFACE# Allows Easy Communication with a Windows PC
GUI Software that Drives the I²C Serial Interface for Optional Software Control
Startup Output Voltage Adjustable Through External Feedback Resistors
Output Voltage Dynamically Adjustable Through the I²C Serial Interface
I²C Slave Address, Switching Current Limit, and Feedback Configuration Adjustable Using R_SEL (R9)

Product Details

The MAX77831 evaluation kit (EV kit) provides a proven design to evaluate the MAX77831, a 7A switching current, high-performance buck-boost regulator that only operates in forced-PWM (FPWM) mode. The IC is capable of 2.5V to 16V input and dynamically adjustable output between 4.5V to 15V when using internal feedback resistors, or between 3V to 15V when using external feedback resistors. The EV kit is factory-configured as internal feed- back with the default startup output voltage at 5V. Other startup voltage can be achieved with external feedback resistors. Output voltage can be adjusted dynamically through the I²C serial interface.

The I/O pins are available to support the I²C serial inter- face, Enable function, and Interrupt/Power-OK indicator. The I²C slave address, switching current limit, and feed- back configuration can be adjusted by changing the R_SEL resistor value (R9). The MAXUSB_INTERFACE# allows the use of Windows^®-based software with a friendly graphical user interface (GUI) as well as a detailed register-based interface to exercise all the features of the IC. The IC installed on the EV kit is the MAX77831BEWB+T.

Applications

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

Resources

MAX77831WEVKIT ODB Files - Design Files
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