MP28373 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 3A, 28V, 1.4MHz Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP28373 is a 1.4MHz step-down regulator
with a built-in power MOSFET. It achieves 3A
continuous output current over a wide input
supply range with excellent load and line
regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-
cycle current limiting and thermal shutdown.
Adjustable soft-start reduces the stress on the
input source at turn-on. In shutdown mode, the
regulator draws 20μA of supply current.
The MP28373 is available in an 8-pin SOIC
package with an exposed pad, and requires a
minimum number of readily available external
components to complete a 3A step-down DC to
DC converter solution.
EVALUATION BOARD REFERENCE
Board Number
EV28373DN-00A
Dimensions
2.0” x 1.9” x 0.4”
MP28373
3A, 28V, 1.4MHz
Step-Down Converter
FEATURES
• 3A Continuous Output Current, 4A Peak
Output Current
• Programmable Soft-Start
• 100mΩ Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 91% Efficiency
• 20μA Shutdown Mode
• Fixed 1.4MHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 28V Operating Input Range
• Output is Adjustable From 0.92V to 21V
• Under Voltage Lockout
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
INPUT
OPEN =
AUTOMATIC
STARTUP
C1
CERAMIC
2
1
C5
7
IN
EN
BS ₃
SW
8
SS
MP28373
5
FB
GND
COMP
4
C4
6
C6
OPEN
D1
C3
R3
L1
OUTPUT
3.3V
3A
R1
R2
C2
CERAMIC
Efficiency Curve
100
V_OUT=5V
90
V_OUT=3.3V
80
70
V_IN=12V
60
0 0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
MP28373 Rev. 1.0
www.MonolithicPower.com
1
12/12/2007
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