General Description

The MIC5156, MIC5157, and MIC5158 Super Low-Dropout (LDO) Regulator Controllers are single IC solutions for high current low-dropout linear voltage regulation. Super LDO? Regulators have the advantages of an external N-channel power MOSFET as the linear pass element.

The MIC5156/7/8 family features a dropout voltage as low as the RDS(ON) of the external power MOSFET multiplied by the output current. The output current can be as high as the largest MOSFETs can provide.

Features

? 4.5mA typical operating current

? <1μA typical standby current

? Low external parts count

? Optional current limit (35mV typical threshold)

? 1 initial output voltage tolerance in most configurations

? 2 output voltage tolerance over temperature

? Fixed output voltages of 3.3V, 5.0V (MIC5156)

? Fixed output voltages of 3.3V, 5.0V, 12V (MIC5157)

? Programmable (1.3 to 36V) with 2 resistors (MIC5156/8)

? Internal charge pump voltage tripler (MIC5157/8)

? Enable pin to activate or shutdown the regulator

? Internal gate-to-source protective clamp

? All versions available in DIP and SOIC

Applications

? Ultrahigh current ultralow dropout voltage regulator

? Constant high-current source

? Low parts count 5.0V to 3.3V computer supply

? Low noise/low-dropout SMPS post regulator

? High-current, current-limited switch