MP6400 -- LOW QUIESCENT CURRENT PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT

MP6400 Rev. 1.0

www.MonolithicPower.com

6

9/7/2012

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

© 2012 MPS. All Rights Reserved.

TM

PIN FUNCTIONS

QFN

Pin #

TSOT

Pin #

Name

Description

6

1

R E S E T

R E S E T

is an open drain signal which will be asserted when the SENSE voltage

drops below a preset threshold or when the manual reset (

M R

) pin drops to a logic

low. The

R E S E T

delay time is programmable from 2.1ms to 10s by using external

capacitors. A pull-up resistor bigger than 10k should be connected this pin to

supply line, and the

R E S E T

5

2

GND

Ground.

4

3

M R

The manual reset (

M R

) can introduce another logic signal to control the

R E S E T

. It is

3

4

GND could be used to get the user’s programmable time from 2.1ms to 10s.

2

5

SENSE

SENSE pin is connected to the monitored system voltage. When the monitored

voltage is below desired threshold,

R E S E T

is asserted.

1

6

Supply voltage. A 0.1uF decoupling ceramic capacitor should be put close to this

pin.

DETAIL DESCRIPTION

The MP6400 product family asserts a

R E S E T

signal when either the SENSE pin voltage is

M R

) is driven

low. The MP6400 family can be monitored a fixed

voltage

from

0.9V

to

5.0V,

while

the

MP6400DG(J)-01 can monitor any voltage above

0.4V by adjusting the external resistor divider.

After both the manual reset (

M R

) and SENSE

voltages exceed their thresholds, the

R E S E T

output

remains

asserted

for

a

user’s

programmable delay time. Two fixed

times are user-selectable: 380ms delay time by

time from 2.1ms to 10s could be gotten by

The wide monitor voltage and programmable

reset delay time make MP6400 product family

suitable for a broad array of applications.