MP5403

– CONFIGURABLE 2.7V-6V MINI PMIC WITH DUAL 2.5A/3.5A BUCK,

ONE LOAD SWITCH, AND INPUT POWER SUPERVISORY

MP5403 Rev. 1.0

www.MonolithicPower.com

14

9/20/2016

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© 2016 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

minimized.

2

PFL_ADJ

Power failure threshold adjust. A resistor divider connected to the voltage rails is

used to program the power failure threshold. The resistor divider needs to be

monitored.

3

VIN1

Input supply voltage to the 3.5A switching regulators and internal logic module.

Place a small decoupling capacitor as close to VIN1 and GND as possible.

4

AGND

Analog ground.

5

GND

Ground.

6

VIN2

Input supply voltage to the 2.5A switching regulators. Place a small decoupling

capacitor as close to VIN2 and GND as possible.

7

FB1

Feedback voltage sensing for the 3.5A regulator. Connect the output voltage of the

3.5A regulator through a resistor divider to FB1 to achieve output voltage regulation.

Pull FB1 to ground to operate the 3.5A regulator in 100% duty cycle on mode.

8

FB2

Feedback voltage sensing for the 2.5A regulator. Connect the output voltage of the

2.5A regulator through a resistor divider to FB2 to achieve output voltage regulation.

Pull FB2 to ground to operate the 2.5A regulator in 100% duty cycle on mode.

9

EN1

Enable on/off control for the 3.5A regulator.

There is a 2MΩ resistor from EN1 to

GND internally. Float or ground EN1 to turn off the 3.5A regulator.

10

EN2

Enable on/off control for the 2.5A regulator.

There is a 2MΩ resistor from EN2 to

GND internally. Float or ground EN2 to turn off the 2.5A regulator.

11

EN3

Enable on/off control for the load switch. There is a 2M

Ω resistor from EN3 to GND

internally. Float or ground EN3 to turn off the load switch.

12

SW2

Switch output for the 2.5A regulator. A thick and wide power routing trace is

recommended for SW2 to conduct current.

13

possible.

14

SW1

Switch output for the 3.5A regulator. A thick and wide power routing trace is

recommended for SW1 to conduct current.

15

PG1

Power good for the 3.5A regulator. PG1 is an open-drain output. When the output

voltage is between -10% to +30% of the regulation, PG1 is pulled high externally.

When there is no supply, PG1 is pulled low internally.

16

PG2

Power good for the 2.5A regulator. PG2 is an open-drain output. When the output

voltage is between -10% to +30% of the regulation, PG2 is pulled high externally.

When there is no supply, PG2 is pulled low internally.

17

PG3

Power good for the load switch. PG3 is an open-drain output. When the output

voltage is below 200mV compared with the input voltage, PG3 is pulled high externally.

18

VIN3

Input supply voltage for the load switch.

19

OUT3

Output voltage for the load switch.

20

PFL

Power failure indicator. PFL is an open-drain output. When the PFL_ADJ voltage is

less than 0.6V, PFL is pulled low immediately.