MP2303 データシートの表示（PDF） - Monolithic Power Systems
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MP2303 Datasheet PDF : 14 Pages
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TM
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
PIN FUNCTIONS
SOIC8N
Pin #
3x3
QFN10
Pin #
Name Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-
1
9
BS Channel MOSFET switch. Connect a 0.01µF 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
2
1
IN
switches. Drive IN with a 4.75V to 28V 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
3
2
SW 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.
4
3, 4, 5
GND
Ground. SOIC8: Connect the exposed pad to pin 4. 3x3 QFN10: Connect to pins
3, 4 and 5 and ensure that said pins are tied together.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB
5
6
FB with a resistive voltage divider from the output voltage. The feedback reference
voltage is 0.8V. See Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop.
6
7
COMP
Connect a series RC network from COMP to GND to compensate the regulation
control loop. In some cases, an additional capacitor from COMP to GND is
required. See Compensation Components.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN higher
7
8
EN than 2.7V to turn on the regulator, drive it lower than 1.1V to turn it off. Pull up to
the IN pin with 100kΩ resistor for automatic startup.
8
10
SS
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor from
SS to GND to set the soft-start period. See Soft-Start Capacitor.
MP2303 Rev. 0.92
www.MonolithicPower.com
4
5/2/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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