MP28300

– ULTRA-LOW I

MP28300 Rev.1.01

www.MonolithicPower.com

12

6/6/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2017 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin#

Name

Description

1

OUT1

Output voltage sensing of the step-down switcher. Connect the load to OUT1. An

output capacitor is needed to decrease the output voltage ripple.

2

CTRL1

Step-down switcher control signal. Adjust the step-down switcher output voltage value

dynamically. Do not float the CTRL pins during application. When used, ensure that the

CTRL voltage is not lower than VIN. If unused, tie CTRL to GND. Refer to Table 1 on page

14 to set the buck output value.

3

CTRL2

4

CTRL3

5

CTRL4

LDO control signal. Adjust the LDO output voltage value dynamically. Do not float the

CTRL during application. When used, ensure that the CTRL voltage is not lower than VIN.

If unused, tie CTRL to GND. Refer to Table 1 on page 14 to set the LDO output value.

6

CTRL5

7

PG1

Power good for the step-down switcher. PG1 is an open-drain output.

8

GND

Ground.

9

SW

Switch output for the step-down switcher. SW is the drain of the internal, high-side, P-

channel MOSFET. Connect the inductor to SW to complete the converter.

10

VIN1

Input supply voltage to the step-down switcher. Place a small decoupling capacitor as

close to VIN1 and GND as possible.

11

VIN2

Input supply voltage to the LDO. Place a small decoupling capacitor as close to VIN2

and GND as possible.

12

OUT2

Output voltage sensing of LDO. OUT2 is the output of the linear regulator. Bypass OUT2

to GND with a 1

μF capacitor.