MP21148 – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER WITH CCM

MP21148 Rev. 1.1

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8

2/16/2017

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PIN FUNCTIONS

Pin

#

Name

Description

1

FB

Feedback. An external resistor divider from the output to GND tapped to FB sets the output

voltage.

2

GND

Power ground.

3

VIN

Supply voltage. The MP21148 operates on a +2.3V to +5.5V unregulated input. A decoupling

capacitor is needed to prevent large voltage spikes from appearing at input.

4

SW

Output switching node. SW is the drain of the internal, high-side, P-channel MOSFET. Connect

the inductor to SW to complete the converter.

5

EN

On/off control.

6

OUT

Output voltage power rail and input sense. Connect the load to OUT. An output capacitor is

needed to decrease the output voltage ripple.