MP1591
2A, 32V, 330KHz
Step-Down Converter
MP1591 Rev. 2.3 www.MonolithicPower.com 1
9/27/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
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.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV0020 2.1”X x 1.4”Y x 0.5”Z
FEATURES
• Wide 6.5V to 32V Input Operating Range
• 34V Absolute Maximum Input
• 2A Output Current
• 120m 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
APPLICATIONS
• Automotive Power Adapters
• PDA and Cellular Phone Battery Chargers
• Distributed Power Systems
• Automotive Aftermarket Electronics
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
INPUT
6.5V to 32V
OPEN
NOT USED
OUTPUT
2.5V
2A
C4
4.7nF
D1
C2
10nF
MP1591
BSIN
FB
SW
REF
GND COMP
EN
1
3
5
6
4
8
7
2
C3
OPEN
OFF ON
100
90
80
70
60
50
40
30
20
EFFICIENCY (%)
0 0.5 1 1.5 2
LOAD CURRENT (A)
Efficiency vs
Load Current
V
OUT
=5V
V
OUT
=3.3V
V
IN
=12V
