MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER

MP2143H Rev. 1.02

www.MonolithicPower.com

9

6/30/2016

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PIN FUNCTIONS

QFN-10

Pin #

Name

Description

1

EN

On/Off Control

2

FB

Feedback pin. Connect an external resistor divider from the output to AGND to set the

output voltage.

3

AGND Analog ground. Reference for the internal control circuit.

4

OUT

Input Sense. For output voltage feedback.

5

NC

Not Connected. It can be floated or connected to PGND for thermal.

6, 7

PGND Power Ground

8

SW

Switch Output

9

VIN

Supply Voltage. The MP2143H operates from a 2.5V-to-5.5V unregulated input. C1

prevents large voltage spikes from appearing at the input.

10

PG

Power-Good Indicator. The pin output is an open drain that connects to VIN by an internal

pull-up resistor. PG is pulled up to VIN when the FB voltage is within ±10% of the

regulation level. If FB voltage is out of that regulation range, it is LOW.