MP1580
2A, 380 KHz
Step-Down
Converter
MP1580 Rev. 2.9w
www.MonolithicPower.com
1
8/11/2005
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
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.
EVALUATION BOARD REFERENCE
Board Number
Dimensions
EV0007
2.3”X x 1.5”Y x 0.5”Z
FEATURES
• 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
APPLICATIONS
• Distributed
Power
Systems
• Battery
Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP1580_TAC_S01
MP1580
SW
IN
BS
FB
SYNC
COMP
GND
EN
OUTPUT
2.5V / 2A
INPUT
4.75V to 25V
OPEN
NOT USED
OFF ON
C6
OPEN
C3
2.2nF
C5
10nF
D1
6
5
3
1
2
7
8
4
EFFICIENCY
(%)
95
90
85
80
75
70
OUTPUT CURRENT (A)
MP1580_TAC_EC01
Efficiency vs
Output Current Voltage
0
0.5
1.5
1
2
V
OUT
= 5.0V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
IN
= 10V