MP1570 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 3A, 23V, 340KHz Synchronous Rectified Step-Down Converter

TM
The Future of Analog IC Technology ^TM
MP1570
3A, 23V, 340KHz Synchronous Rectified
Step-Down Converter
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.
EVALUATION BOARD REFERENCE
Board Number
EV1570DN-00A
Dimensions
2.0”X x 1.5”Y x 0.5”Z
FEATURES
• 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
APPLICATIONS
• Distributed Power Systems
• Pre-Regulator for Linear Regulators
• Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
C5
10nF
2
7
IN
EN
1
BS
SW
3
MP1570
8 _SS
FB ⁵
GND
COMP
4
6
C6
(optional)
C3
3.3nF
D1
B130
(optional)
OUTPUT
3.3V
3A
MP1570_TAC01
Efficiency vs.
Load Current
100
V_IN=9V
95
90
85
V_IN=12V
80 V_IN=23V
75
70
65
V_OUT=5V
60
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
MP1570-EC02
MP1570 Rev. 1.5
www.MonolithicPower.com
1
1/31/2006
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