MP1423 データシートの表示（PDF） - Monolithic Power Systems
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MP1423 Datasheet PDF : 11 Pages
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TM
MP1423 – 3A, 23V, 385KHz STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency Curve
VIN = 7V
100
VIN=5.0V
90
VIN=2.5V
80
VIN=3.3V
70
60
50
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
MP1423-TPC01
Soft-Start
CSS Open, VIN = 10V, VOUT = 3.3V,
1.5A Resistive Load
VEN
5V/div.
VOUT
2V/div.
IL
1A/div.
MP1423-TPC02
VEN
5V/div.
VOUT
2V/div.
IL
1A/div.
VEN
5V/div.
VOUT
2V/div.
IL
1A/div.
MP1423-TPC03
1ms/div.
MP1423-TPC04
PIN FUNCTIONS
Pin #
1
2
3
4
5
Name
BS
IN
SW
GND
FB
Description
High-Side Gate Drive Bootstrap Input. BS supplies the drive for the high-side N-Channel
MOSFET switch. Connect a 4.7nF or greater capacitor from SW to BS to power the high side
switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 6V to 23V power source. Bypass IN to GND with a suitably large capacitor to
eliminate noise on the input to the IC. See Input Capacitor
Power Switching Output. SW is the switching node that supplies power to the output. Connect
the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS
to power the high-side switch.
Ground. (Note: For the SOIC8N package, connect the exposed pad on backside to Pin 4).
Feedback Input. FB senses the output voltage to regulate said voltage. Drive FB with a
resistive voltage divider from the output voltage. The feedback threshold is 1.222V. See
Setting the Output Voltage
MP1423 Rev. 1.1
www.MonolithicPower.com
3
1/6/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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