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LTC3858-2 - Low I, Dual 2-Phase Synchronous Step-Down Controller

Analog Devices

LTC3858-2 - Low I, Dual 2-Phase Synchronous Step-Down Controller RSS Sample
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Kod:
LTC3858-2
Producent:
ANALOG DEVICES
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The LTC3858-2 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.

The 170μA no-load quiescent current extends operating life in battery-powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3858-2 differs from the LTC3858 by having the overvoltage protection crowbar and short-circuit latchoff disabled. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.

Independent soft-start pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.

LTC3858

LTC3858-1

LTC3858-2

Features

Adjustable Current Limit, Clock Output, Phase Modulation, 2 PGOOD Outputs

Fixed Current Limit, One PGOOD Output

Overvoltage protection crowbar and short-circuit latchoff disabled

Package

QFN-32

SSOP-28

QFN-32

* Automotive Systems

* Battery Operated Digital Devices

* Distributed DC Power Systems

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