MP28372 Datasheet, PDF (1/12 Pages) Monolithic Power Systems – Dual 1.5A, 23V, 1.4MHz Step-Down Converter

The Future of Analog IC Technology
MP28372
Dual 1.5A, 23V, 1.4MHz
Step-Down Converter
DESCRIPTION
The MP28372 is a dual monolithic step-down
switch mode converter with built-in internal
power MOSFETs. It achieves 1.5A continuous
output current for each output 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. In
shutdown mode, the regulator draws 40μA of
supply current.
The MP28372 requires a minimum number of
readily available standard external components.
EVALUATION BOARD REFERENCE
Board Number
EV28372DF-01A
Dimensions
2.2”X x 1.6”Y x 0.4”Z
FEATURES
• 1.5A Current for Each Output
• 0.18Ω Internal Power MOSFET Switches
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 90% Efficiency
• 40μA Shutdown Mode
• Fixed 1.4MHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 23V Operating Input Range
• Each Output Adjustable from 0.92V to 16V
• Configurable for Single Output with Double
the Current
• Programmable Under Voltage Lockout
• Programmable Soft-Start
• Available in TSSOP20 with Exposed Pad
and SOIC Packages
APPLICATIONS
• Distributed Power Systems
• I/O and Core supplies
• DSL Modems
• Set top boxes
• Cable Modems
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
12V
3.3V @ 1.5A
OFF ON
10nF
2A
Schottky
1
SSA
20
ENA
2
NC1
19
COMPA
3
BSA
18
FBA
4
INA
17
SGB
5
16
SWA
6
MP28372 ^PGB ₁₅
PGA
SWB
7
SGA
8
FBB
14
INB
13 10nF
NC2
9
COMPB
12
BSB
10
ENB
11
SSB
82pF
2A
Schottky
3.3nF
OFF ON
2.2nF
2.5V @ 1.5A
Efficiency vs
Load Current
100
V_OUT=3.3V
90
V_OUT=5V
80
V_OUT=2.5V
70
60
50
0
0.5
1.0
1.5
LOAD CURRENT (A)
MP28372 Rev. 1.4
www.MonolithicPower.com
1
12/10/2007
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© 2007 MPS. All Rights Reserved.