TM
MP1580
2A, 380 KHz
Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP1580 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 2A 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. In
shutdown mode the regulator draws 23µA of
supply current.
The MP1580 requires a minimum number of
readily available standard external components. A
synchronization pin allows the part to be driven to
600KHz.
FEATURES
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2A Output Current
0.18Ω Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
Capacitors
Up to 95% Efficiency
23µA Shutdown Mode
Fixed 380KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75 to 25V Operating Input Range
Output Adjustable from 1.22V to 21V
Programmable Under Voltage Lockout
Frequency Synchronization Input
Available in an 8-Pin SO Package
Distributed Power Systems
Battery Chargers
Pre-Regulator for Linear Regulators
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number
EV0007
Dimensions
2.3”X x 1.5”Y x 0.5”Z
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 25V
OFF ON
OPEN
NOT USED
7
8
C5
10nF
95
2
IN
EN
1
BS
SW
Efficiency vs
Output Current Voltage
V
OUT
= 5.0V
V
OUT
= 3.3V
V
OUT
= 2.5V
90
MP1580
SYNC
GND
4
FB
COMP
6
5
D1
EFFICIENCY (%)
3
OUTPUT
2.5V / 2A
85
80
75
70
0
C6
OPEN
C3
2.2nF
V
IN
= 10V
0.5
1
1.5
2
MP1580_TAC_S01
OUTPUT CURRENT (A)
MP1580_TAC_EC01
MP1580 Rev. 3.0
12/5/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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