FEATURES
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LTC1538-AUX/LTC1539 Dual High Efficiency, Low Noise, Synchronous Step-Down Switching
Regulators DESCRIPTION
The LTC ®1538-AUX/LTC1539 are dual, synchronous stepdown switching
regulator controllers which drive external N-channel power MOSFETs in a phase-lockable fixed frequency architecture.
The Adaptive PowerTM output stage selectively drives two N-channel MOSFETs at frequencies up to 400kHz while reducing switching losses to maintain high efficiencies at low output currents.
An auxiliary 0.
5A linear
regulator using an external
PNP pass device provides a low noise, low dropout voltage source.
A secondary winding feedback control pin (SFB1) guarantees regulation regard...