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MAX77231：2.75V to 4.8V Input, 10mA Output, 35µVRMS Ultra Low Noise and Ripple Boost Regulator

Compact boost with only 35µVRMS ripple and noise

The MAX77231 is optimized for boost applications, requiring very low ripple/noise and small PCB space. Output ripple and noise are suppressed to 35µVRMS (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.

关键特性 Ultra-Small Solution Size (< 7mm2) 35µVRMS (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

MAX77231:Block Diagram 应用

数据手册DataSheet

关键参数

开发工具

• MAX77231EVKIT

质量和环境数据

• MAX77231.pdf

订购型号