MP6400 -- LOW QUIESCENT CURRENT PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT
MP6400 Rev. 1.1 www.MonolithicPower.com 6
12/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
TM
PIN FUNCTIONS
QFN
Pin #
TSOT
Pin #
Name Description
6 1
is an open drain signal which will be asserted when the SENSE voltage
drops below a preset threshold or when the manual reset (
) pin drops to a logic
low. The
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
outputting a higher voltage than V
CC
is allowable.
5 2 GND Ground.
4 3
The manual reset (
) can introduce another logic signal to control the . It is
internally connected to V
CC
through a 90kΩ resistor.
3 4 C
DELAY
Programmable reset delay time pin. When C
DELAY
connected to V
CC
through a
resistor between 50kΩ and 200kΩ, a 380ms delay time is selected. When C
DELAY
floated, the delay time is 24ms. A capacitor bigger than 150pF connected C
DELAY
to
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,
is asserted.
1 6 V
CC
Supply voltage. A 0.1uF decoupling ceramic capacitor should be put close to this
pin.
DETAIL DESCRIPTION
The MP6400 product family asserts a
signal when either the SENSE pin voltage is
lower than V
IT
or the manual reset ( ) 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 (
) and SENSE
voltages exceed their thresholds, the
output remains asserted for a user’s
programmable delay time. Two fixed
delay
times are user-selectable: 380ms delay time by
connecting the C
DELAY
pin to V
CC
, and 24ms delay
time by leaving the C
DELAY
pin float. Any delay
time from 2.1ms to 10s could be gotten by
connecting a capacitor between C
DELAY
and GND.
The wide monitor voltage and programmable
reset delay time make MP6400 product family
suitable for a broad array of applications.
