1 Features

1• Input Voltage Range of 2.95 V to 5.5 V

• Maximum Load Current of 4 A

• Wide Bandwidth Voltage Mode Control Loop,

Partial Internal Compensation

• Fixed Switching Frequency of 500 kHz or 1 MHz

• 35-mΩ Integrated MOSFET Switches

• Adjustable Output Voltage Down to 0.8 V

• Optimized Reference Voltage Initial Accuracy and

Temperature Drift

• External Soft-Start Control With Tracking

Capability

• Enable Pin With Hysteresis

• Low Standby Current of 230 μA

• Pre-Biased Load Start-up Capability

• Integrated UVLO, OCP, and Thermal Shutdown

• 100% Duty Cycle Capability

• HTSSOP-16 Exposed Pad Package

2 Applications

• Low Voltage POL Regulation from 5-V or 3.3-V

Rail

• Local Solution for FPGA/DSP/ASIC/μP Core or

I/O Power

• Broadband Networking and Communications

Infrastructure

• Portable Computing

3 Description

The LM2854 PowerWise™ buck regulator is a 500-

kHz or 1-MHz step-down switching voltage regulator

capable of driving up to a 4-A load with exceptional

power conversion efficiency, line and load regulation,

and output accuracy. The LM2854 can accept an

input voltage rail between 2.95 V and 5.5 V, and

deliver an adjustable and highly accurate output

voltage as low as 0.8 V. Externally established softstart

with a small capacitor facilitates controlled startup,

and the LM2854 is capable of starting gracefully

into a pre-biased output voltage. Partial internal

compensation reduces the number of external

passive components and PC board space typically

necessary in a voltage mode buck converter

application, yet preserving flexibility to deal with

ceramic and/or electrolytic based load capacitors.

Lossless cycle-by-cycle peak current limit is used to

protect the load from an overcurrent or short-circuit

fault, and an enable comparator simplifies

sequencing applications. The LM2854 is available in

an exposed pad HTSSOP-16 package that enhances

the thermal performance of the regulator.