LMR24220 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – SIMPLE SWITCHER® 42Vin, 2.0A Step-Down Voltage Regulator in micro SMD

LMR24220
October 5, 2011
SIMPLE SWITCHER® 42Vin, 2.0A Step-Down Voltage
Regulator in micro SMD
Features
■ ^{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 micro SMD (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}
System Performance
Efficiency vs Load Current
(V_OUT = 3.3V)
100
90
80
70
60
50
40
0.0
VIN = 4.5V
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 42V
0.4 0.8 1.2 1.6
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
2.0
30167670
-0.2
-0.4
-0.6
-0.8
0.0 0.4 0.8 1.2 1.6 2.0
LOAD CURRENT (A)
30167671
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© 2011 National Semiconductor Corporation 301676
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