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LTC3859 - Buck/Buck/Boost Synchronous Controller

Description

The LTC®3859 is a high performance triple output (buck/ buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages.

Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 850kHz.

Features

  • n Dual Buck Plus Single Boost Synchronous Controllers n Outputs Remain in Regulation Through Cold Crank Down to 2.5V n Low Operating IQ: 55μA (One Channel On) n Wide Bias Input Voltage Range: 4.5V to 38V n Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n Boost Output Voltage Up to 60V n RSENSE or DCR Current Sensing n 100% Duty Cycle for Boost Synchronous MOSFET n Phase-Lockable Frequency (75kHz to 850kHz) n Programmable Fixed Frequency (50kHz to 900kHz) n Selectable Continuous, Pulse-Skipping or.

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Full PDF Text Transcription

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FEATURES n Dual Buck Plus Single Boost Synchronous Controllers n Outputs Remain in Regulation Through Cold Crank Down to 2.5V n Low Operating IQ: 55μA (One Channel On) n Wide Bias Input Voltage Range: 4.5V to 38V n Buck Output Voltage Range: 0.
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