TM
MP1570
3A, 23V, 340KHz Synchronous Rectified
Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP1570 is a monolithic synchronous buck
regulator. The device integrates 100mΩ
MOSFETS that provide 3A continuous load
current over a wide operating input voltage of
4.75V to 23V. Current mode control provides
fast transient response and cycle-by-cycle
current limit.
An adjustable soft-start prevents inrush current
at turn-on. In shutdown mode, the output is
actively discharged by transferring energy in the
output capacitor to the input capacitor, dropping
the supply current to 1µA.
This device, available in an 8-pin SOIC
package, provides a very compact system
solution with minimal reliance on external
components.
FEATURES
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3A Output Current
Wide 4.75V to 23V Operating Input Range
Integrated 100mΩ Power MOSFET Switches
Output Adjustable from 1.23V to 20V
Up to 95% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 340KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Thermally Enhanced 8-Pin SOIC Package
Distributed Power Systems
Pre-Regulator for Linear Regulators
Notebook Computers
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number
EV1570DN-00A
Dimensions
2.0”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 23V
C5
10nF
100
95
2
IN
7
EN
8
1
BS
3
SW
Efficiency vs.
Load Current
V
IN
=9V
EFFICIENCY (%)
MP1570
SS
GND
4
FB
COMP
6
OUTPUT
3.3V
3A
90
85
80
75
70
65
60
0
V
OUT
=5V
0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
MP1570-EC02
V
IN
=12V
V
IN
=23V
5
C6
(optional)
C3
3.3nF
D1
B130
(optional)
MP1570_TAC01
MP1570 Rev. 1.5
1/31/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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