TM
MP1591
2A, 32V, 330KHz
Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
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.
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.
FEATURES
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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
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
Automotive Power Adapters
PDA and Cellular Phone Battery Chargers
Distributed Power Systems
Automotive Aftermarket Electronics
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number
EV0020
Dimensions
2.1”X x 1.4”Y x 0.5”Z
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
6.5V to 32V
C2
10nF
100
90
2
1
IN
EN
BS
3
SW
Efficiency vs
Load Current
V
OUT
=5V
V
OUT
=3.3V
OFF ON
OPEN
NOT USED
7
EFFICIENCY (%)
8
MP1591
REF
GND
4
FB
COMP
6
5
D1
OUTPUT
2.5V
2A
80
70
60
50
40
30
20
0
C3
OPEN
C4
4.7nF
V
IN
=12V
0.5
1
1.5
LOAD CURRENT (A)
2
MP1591_TAC_S01
MP1591_EC01
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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