MP1482 MPS, MP1482 Datasheet - Page 4

• Manufacturer Part Number: MP1482
• Description: 2a, 18v Synchronous Rectified Step-down Converter
• Manufacturer: MPS

PIN FUNCTIONS
MP1482 Rev. 1.2
1/13/2010
SOIC8
Pin #
1
2
3
4
5
6
7
8
SOIC8E
Pin #
1
2
3
4
5
6
7
8
COMP
Name Description
GND
SW
EN
BS
FB
SS
IN
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
MP1482 – 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
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 18V 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.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB
with a resistive voltage divider from the output voltage. The feedback threshold is
0.923V. 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 high to
turn on the regulator, drive it low to turn it off. Pull up 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. A 0.1μF capacitor sets the soft-start period
to 15ms. To disable the soft-start feature, leave SS unconnected.
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