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MAX77231 - Ultra-Low Noise Boost Regulator

Description

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.

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MAX77231 EVALUATION KIT AVAILABLE 2.75V to 4.8V Input, 10mA Output, 35µVRMS Ultra-Low Noise Boost Regulator General Description 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.
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