1 Features

1• Input Voltage Range of 4.5 V to 42 V

• Output Voltage Range of 0.8 V to 24 V

• Output Current up to 2 A

• Integrated Low RDS(ON) Synchronous MOSFETs

for High Efficiency

• Up to 1-MHz Switching Frequency

• Low Shutdown IQ, 25 μA Typical

• Programmable Soft Start

• No Loop Compensation Required

• COT Architecture with ERM

• Tiny Overall Solution Reduces System Cost

• Integrated Synchronous MOSFETs Provides High

Efficiency at Low Output Voltages

• COT with ERM Architecture

• Stable with Low ESR Capacitors

• 28-Bump DSBGA (3.676 × 2.48 × 0.60 mm

maximum) Packaging

• Create a custom design using the LMR24220 with

the WEBENCH® Power Designer

2 Applications

• Point-of-Load Conversions from 5-V, 12-V, and

24-V Rails

• Space Constrained Applications

• Industrial Distributed Power Applications

• Power Meters

3 Description

The LMR24220 synchronously rectified buck

converter features all required functions to implement

a highly efficient and cost effective buck regulator. It

is capable of supplying 2-A to loads with an output

voltage as low as 0.8 V. Dual N-channel synchronous

MOSFET switches allow a low component count, thus

reducing complexity and minimizing board size.

Different from most other COT regulators, the

LMR24220 does not rely on output capacitor ESR for

stability. The device is designed to work exceptionally

well with ceramic and other very low ESR output

capacitors. It requires no loop compensation, results

in a fast load-transient response and simple circuit

implementation. The operating frequency remains

nearly constant with line variations due to the inverse

relationship between the input voltage and the ontime.

The operating frequency can be externally

programmed up to 1 MHz. Protection features include

VCC undervoltage lockout, output overvoltage

protection, thermal shutdown, and gate drive

undervoltage lockout. The LMR24220 is available in

the small DSBGA low profile chip-scale package.