LMR24220_15 Datasheet, PDF (1/24 Pages) Texas Instruments – SIMPLE SWITCHER 42Vin, 2.0A Step-Down Voltage Regulator

LMR24220
www.ti.com
SNVS737E – OCTOBER 2011 – REVISED APRIL 2013
LMR24220 SIMPLE SWITCHER^® 42Vin, 2.0A Step-Down Voltage Regulator
Check for Samples: LMR24220
FEATURES
1
•23 Input Voltage Range of 4.5V to 42V
• Output Voltage Range of 0.8V to 24V
• Output Current up to 2.0A
• Integrated Low R_DS(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
• 28-Bump DSBGA (2.45 x 3.64 x 0.60 mm)
Packaging
• Fully Enabled for WEBENCH^® Power Designer
PERFORMANCE BENEFITS
• Tiny Overall Solution Reduces System Cost
• Integrated Synchronous MOSFETs Provides
High Efficiency at Low Output Voltages
• COT with ERM Architecture Requires no Loop
Compensation, Reduces Component Count,
and Provides Ultra Fast Transient Response
• Stable with Low ESR Capacitors
APPLICATIONS
• Point-of-Load Conversions from 5V, 12V and
24V Rails
• Space Constrained Applications
• Industrial Distributed Power Applications
• Power Meters
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 2A to loads with an output
voltage as low as 0.8V. 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, and 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 on-
time. The operating frequency can be externally
programmed up to 1 MHz. Protection features include
V_CC under-voltage lock-out, output over-voltage
protection, thermal shutdown, and gate drive under-
voltage lock-out. The LMR24220 is available in the
small DSBGA low profile chip-scale package.
System Performance
Efficiency vs Load Current
(V_OUT = 3.3V)
100
90
80
70
60
VIN = 4.5V
50
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 42V
40
0.0 0.4 0.8 1.2 1.6 2.0
LOAD CURRENT (A)
V_OUT Regulation vs Load Current
(V_OUT = 3.3V)
0.8
0.6
VIN = 4.5V
VIN = 9V
0.4
VIN = 12V
VIN = 24V
0.2
VIN = 42V
0.0
-0.2
-0.4
-0.6
-0.8
0.0 0.4 0.8 1.2 1.6 2.0
LOAD CURRENT (A)
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2013, Texas Instruments Incorporated