MP2303DQ MPS [Monolithic Power Systems], MP2303DQ Datasheet - Page 4

• Manufacturer Part Number: MP2303DQ
• Description: 3A, 28V, 340KHz Synchronous Rectified Step-Down Converter
• Manufacturer: MPS [Monolithic Power Systems]

PIN FUNCTIONS
MP2303 Rev. 0.92
5/2/2006
SOIC8N
Pin #
1
2
3
4
5
6
7
8
QFN10
3, 4, 5
Pin #
3x3
10
9
1
2
6
7
8
TM
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
COMP
Name Description
GND
SW
BS
EN
SS
FB
IN
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-
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
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
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. 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
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.
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
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.
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.
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
© 2006 MPS. All Rights Reserved.
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