MPQ5069

– 7mΩ PROTECTION SWITCH WITH CURRENT MONITOR

MPQ5069 Rev. 1.1

www.MonolithicPower.com

3

11/19/2020

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© 2020 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

EN

Enable input. Pull the EN pin above its threshold enable the chip. Pull it below its

threshold to shut down the chip.

2

AUTO

Auto-reset enable. Float or pull above 2.5V to enable auto-reset upon fault removal.

Ground for the MPQ5069 to latch off when a fault occurs.

3

NC

Not connected. Float this pin in application.

4

TIMER

Timer set. An external capacitor sets the hot-plug insertion time delay, fault timeout

period, and restart time.

5

ISET

Current-limit set. Place a resistor to ground to set the value of the current limit.

6

SS

Soft start. A connected external capacitor sets the soft-start time of the output voltage.

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

pin to set the soft-start time at its minimum of 1ms.

7

GND

Ground.

8

IMON

Output current monitor. Provides a voltage proportional to the current flowing through

the power device. Place a resistor to ground to set the gain. Floating this pin is not

recommended.

9

FLTB

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

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

Ω resistor.

10

PG

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

a resistor. High = power good. Low indicates output is outside the UVLO window. PG

starts to work when the pull-up supply is enabled, even if VIN and EN are still disabled.

11

FB

Feedback. An external resistor divider from the output sets the output voltage where

the PG pin switches. The rising threshold is 0.6V, with a 60mV hysteresis.

12

PD

Output discharge. Connect to the output to provide a 500

Ω load to discharge the

output when VIN is below its UVLO threshold or the EN pin is within 0.6V of the rising

threshold. Floating PD disables this function.

13

–20

OUT

Output. The output voltage is controlled by the IC.

21, 22,

exposed

pads

VIN

Input power supply.