LTC3857-1 Datasheet Synchronous Step-Down Controller

Manufacturer: Linear Technology (now Analog Devices)

LTC3857-1 synchronous step-down controller by Linear Technology (now Analog Devices) - Datasheet Preview

Datasheet Details

Part number	LTC3857-1
Manufacturer	Linear Technology (now Analog Devices)
File Size	423.71 KB
Description	Synchronous Step-Down Controller
Download	LTC3857-1 Download (PDF)

General Description

Controller The LTC®3857-1 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages.

A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz.

Power loss and noise due to the ESR of the input capacitor ESR are minimized by operating the two controller output stages out of phase.

Key Features

n Low Operating IQ: 50μA (One Channel On) n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n Wide VIN Range: 4V to 38V n RSENSE or DCR Current Sensing n Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n OPTI-LOOP® Compensation Minimizes COUT n Phase-Lockable Frequency (75kHz-850kHz) n Programmable Fixed Frequency (50kHz-900kHz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads n Very Low Dropout Operation: 99% Duty.

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