MP1593_06 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 3A, 28V, 385KHz Step-Down Converter

TM
The Future of Analog IC Technology ^TM
DESCRIPTION
The MP1593 is a step-down regulator with an
internal Power MOSFET. It achieves 3A of
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. An
adjustable soft-start reduces the stress on the
input source at startup. In shutdown mode the
regulator draws 20µA of supply current.
The MP1593 requires a minimum number of
readily available external components,
providing a compact solution.
EVALUATION BOARD REFERENCE
Board Number
EV1593DN-00A
Dimensions
2.1”X x 1.3”Y x 0.4”Z
TYPICAL APPLICATION
INPUT
4.75V to 28V
OFF ON
C5
10nF
2
7
IN
EN
1
BS
SW
3
MP1593
8 _SS
FB ⁵
GND
COMP
4
6
C3
C6
8.2nF
(optional)
D1
B340A
MP1593
3A, 28V, 385KHz
Step-Down Converter
FEATURES
• 3A Output Current
• Programmable Soft-Start
• 100mΩ Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 95% Efficiency
• 20µA Shutdown Mode
• Fixed 385KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 28V Operating Input Range
• Output Adjustable from 1.22V
• Under-Voltage Lockout
• Available in 8-Pin SOIC Package
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
• Flat Panel TVs
• Set-Top Boxes
• Cigarette Lighter Powered Devices
• DVD/PVR Devices
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
OUTPUT
3.3V
3A
Efficiency vs
Load Current
100
95
V_IN = 9V
90
85
V_IN = 24V
80
V_IN = 12V
75
70
65
60
55
50
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
MP1593 Rev. 1.9
www.MonolithicPower.com
1
9/14/2006
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