MAX77231

RECOMMENDED FOR NEW DESIGNS

2.75V to 4.8V Input, 10mA Output, 35µV_RMS Ultra Low Noise and Ripple Boost Regulator

Compact boost with only 35µV_RMS ripple and noise

Data Sheet (Rev. 2) Product Selection Table

Part Models: 2
1ku List Price: Starting From $1.52

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Overview

Ultra-Small Solution Size (< 7mm²)
35µV_RMS (typ) Output Ripple/Noise
11.2V/10mA Output
Output Factory Trimmable from 11.2V to 16.2V
125µA No Load Supply Current Output on < 1µA Shutdown Supply Current
True Shutdown Load Disconnect
Selectable Active Discharge
9-Bump, 1.238mm x 1.238mm x 0.35mm WLP

The MAX77231 is optimized for boost applications, requiring very low ripple/noise and small PCB space. Output ripple and noise are suppressed to 35µV_RMS (in 1MHz BW) by a PMOS linear post-regulator set 0.5V below the boost regulator output to reject noise while optimizing efficiency.

The boost regulator operates using a 1µH/400mA inductor and 2.2µF (0.22 (min) after derating) output capacitance. Fast transient response and stable operation are guaranteed using a current-limited PFM architecture.

A PMOS low-noise linear post-regulator attenuates boost converter ripple by ～50dB (10MHz BW) before delivering 11.2V to the load. Other output voltages up to 16.2V can be factory set. The LDO also disconnects the load from the boost during shutdown, allowing the output to fall to 0V (true shutdown). Active discharge can also be activated.

The MAX77231 is packaged in a 9-bump wafer-level package (WLP), providing a compact layout when combined with the inductor and external capacitors. Total solution size is less than 7mm².

Applications

Low-Noise Bias Supply
Sensor Bias Supply

Part Models: 2
1ku List Price: Starting From $1.52

Documentation

Data Sheet 1

MAX77231: 2.75V to 4.8V Input, 10mA Output, 35µV_RMS Ultra Low Noise and Ripple Boost Regulator Data Sheet (Rev.2) 09/19/2016

Reliability Data 1

MAX77231 Reliability Data 01/12/2023

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
MAX77231EZL+	9-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX77231EZL+T	9-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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

Software Resources

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Tools & Simulations

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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SIMPLIS Models 1

MAX77231 SIMPLIS Schematic

Evaluation Kits

Evaluation Kit for the MAX77231

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Features and Benefits

Ultra-Small Solution Circuit Area (< 7mm²)
35µV_RMS Typical Output Ripple/Noise
2.7V to 4.8V Input Range
11.2V/10mA Output
Output Factory-Trimmable from 11.2V to 16.2V
125µA No-Load Supply Current—Output On
< 1µA Shutdown Supply Current
True Shutdown Load Disconnect
Selectable Active Discharge
Proven PCB layout
Fully Assembled and Tested

Product Details

The MAX77231 evaluation kit (EV kit) is a fully assembled and tested PCB for evaluating the MAX77231 low-noise step-up DC-DC converter. It is optimized for boost applications requiring very low ripple/noise and small PCB space. The EV kit is set up to provide an 11.2V output from an input voltage ranging from 2.7V to 4.8V, and can deliver up to 10mA of current. The output ripple and noise are suppressed to 35µV_RMS. Other output voltages up to 16.2V can be factory set. Jumpers are provided to help evaluate features of the MAX77231 IC.