MP5022C – 12V, 3

m

(

MP5022C Rev. 1.0

www.MonolithicPower.com

10

5/26/2016

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© 2016 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

EN

Enable input. EN used in conjunction with LOADEN can turn on or off the main power

device in the MP5022C. EN is pulled high internally.

2

LOADEN

Load enable input. LOADEN used in conjunction with EN can turn on or off the main

power device in the MP5022C (see Table 1). LOADEN is also used to shut down the

power switch after the LOADEN blanking time, but cannot turn it back on by recycling

LOADEN only.

3

ENTM

LOADEN blanking time set. Connect an external capacitor to set the LOADEN blanking

time. Once EN is active, the timer starts and the LOADEN de-assertion is blanked. The

switch shuts down in the presence of a fault or EN low condition, but LOADEN low during

the blanking time has no effect.

4

TIMER

Timer set. An external capacitor sets the hot-plug insertion time delay and fault time-out

period.

5

ISET

Current limit set. Place a resistor from ISET to ground to set the value of the over-

current limit.

6

SS

Soft start. An external capacitor connected to SS sets the soft-start time of the output

voltage. The internal circuit controls the slew rate of the output voltage at start-up. Float

SS to set the soft-start time at its minimum (1ms).

7

GND

Ground.

8

IMON

Output current monitor. IMON provides a voltage proportional to the current flowing

through the power device. Placing a 10k

Ω resistor (R

voltage when the current is between 0A and 15A. Place a capacitor greater than 10nF in

9

FLTB

Fault bar. FLTB is an open-drain output that drives to ground when an over-current or a

thermal shutdown occurs. Pull FLTB up to an external power supply through a 10-100k

Ω

resistor.

10

PG

Power good. PG is an open-drain output. Pull PG up to an external power supply through

a 10-100k

Ω resistor. PG high means power good.

11

OV

Over-voltage enable input. Pull OV high to turn off the internal MOSFET. Connect OV to

an external resistive divider to set the over-voltage disable threshold.

12

AVIN

Internal power supply for VCC sub regulator. Connect a 49.9

Ω, 0603 package resistor

from VIN to AVIN and a 2.2

μF bypass capacitor to GND to guarantee full operation in the

event that VIN collapses during a strong short from VOUT to GND.

13-20

VOUT

Output. VOUT is the voltage controlled by the IC. A Schottky diode should be placed

between VOUT and GND to absorb the negative voltage spike.

21, 22,

Exposed

Pads

VIN

Input power supply for main power.