LTC3857 Datasheet Synchronous Step-Down Controller

Manufacturer: Linear Technology (now Analog Devices)

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

Datasheet Details

Part number	LTC3857
Manufacturer	Linear Technology (now Analog Devices)
File Size	441.98 KB
Description	Synchronous Step-Down Controller
Download	LTC3857 Download (PDF)

General Description

Controller The LTC®3857 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 (40V Abs Max) 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 Selectable Current Limi.

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