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.