TM
MP1591
2A, 32V, 330KHz
Step-Down Converter
TM
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP1591 is a high voltage step-down
converter ideal for automotive power adapter
battery chargers. Its wide 6.5V to 32V input
voltage range covers the automotive battery’s
requirements and it achieves 2A continuous
output for quick charge capability.
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Wide 6.5V to 32V Input Operating Range
34V Absolute Maximum Input
2A Output Current
120mΩ Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
Capacitors
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Up to 95% Efficiency
20µA Shutdown Mode
Fixed 330KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Output Adjustable From 1.23V to 21V
Under Voltage Lockout
Reference Voltage Output
Available in 8-Pin SOIC Packages
Current mode operation provides fast transient
response and eases loop stabilization. Fault
protection includes cycle-by-cycle current
limiting and thermal shutdown. In shutdown
mode, the converter draws only 20µA of supply
current.
The MP1591 requires a minimum number of
readily available external components to
complete a 2A step-down DC to DC converter
solution.
APPLICATIONS
EVALUATION BOARD REFERENCE
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Automotive Power Adapters
PDA and Cellular Phone Battery Chargers
Distributed Power Systems
Board Number
Dimensions
EV0020
2.1”X x 1.4”Y x 0.5”Z
Automotive Aftermarket Electronics
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
C2
10nF
Efficiency vs
INPUT
6.5V to 32V
Load Current
100
V
=5V
OUT
90
80
70
60
50
40
30
20
2
1
V
=3.3V
OUT
IN
BS
OUTPUT
2.5V
2A
7
8
3
EN
SW
OFF ON
MP1591
D1
5
OPEN
NOT USED
REF
GND
FB
COMP
4
6
C4
4.7nF
C3
V
=12V
IN
OPEN
0
0.5
1
1.5
2
LOAD CURRENT (A)
MP1591_EC01
MP1591_TAC_S01
MP1591 Rev. 2.1
12/5/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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