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LTC3858-2 Datasheet Dual 2-phase Synchronous Step-down Controller

Manufacturer: Linear Technology (now Analog Devices)

General Description

The LTC®3858-2 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 input capacitor ESR are minimized by operating the two controller outputs out of phase.

Key Features

  • n Low Operating IQ: 170μA (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 Burst Mode® Operation at Light Loads n Very Low Dropout Operation: 99% Duty Cycle n Ad.

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