MP2338 – 28V, 3A, SYNCHRONOUS STEP-DOWN CONVERTER W/ INTERNAL MOSFETS

MP2338 Rev. 1.0

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12/11/2020

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PIN FUNCTIONS

Pin #

Name Description

1

PG

Power good output. This pin is an open-drain output. PG pulls low when the IC is disabled.

PG can be pulled up to another DC source. Note that if PG is pulled up to an external voltage,

PG does not de-assert (logic low) if the input power is off. It is recommended to pull PG up to VOUT

so that PG can de-assert when the input power is off.

2

VIN

Supply voltage. The MP2338 operates from a 4.5V to 28V input rail. Place a ceramic

capacitor on VIN to decouple the input rail. Connect VIN using a wide PCB trace.

3

SW

Switch output. Connect SW using a wide PCB trace.

4

GND

System ground. Reference ground of the regulated output voltage. GND requires additional

considerations when designing the PCB layout. Connect GND with copper traces and vias.

5

BST

Bootstrap. Connect a capacitor between the SW and BST pins to form a floating supply

across the high-side switch driver. Generally, use a 0.1µF bootstrap capacitor.

6

EN

Enable pin. EN is a digital input that turns the buck converter on or off. When the power

supply of the control circuit is ready, drive EN high to turn the buck converter on. Drive EN low

to turn the converter off. Connect EN to VIN through a resistive voltage divider for automatic

start-up. The EN voltage should not exceed 6V.

7

SS

Soft start. Connect an external capacitor to SS to configure the soft-start time for the switch-

mode converter.

8

FB

Feedback. Connect FB to the tap of an external resistor divider from the output to GND to set

the output voltage.