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.