MP6400DJ-01-LF-Z Monolithic Power Systems (MPS), MP6400DJ-01-LF-Z Datasheet - Page 9

• Manufacturer Part Number: MP6400DJ-01-LF-Z
• Description: Supervisory Circuits Low Quiescent Delay Supv Circuit
• Manufacturer: Monolithic Power Systems (MPS)

Specifications of MP6400DJ-01-LF-Z

• Rohs: yes
• Number Of Voltages Monitored: 1
• Monitored Voltage: Adjustable
• Undervoltage Threshold: 0.4 V
• Overvoltage Threshold: Adjustable
• Output Type: Open Collector / Drain
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 380 ms
• Supply Voltage - Max: 6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSOT23-6
• Maximum Power Dissipation: 570 mW
• Power Fail Detection: Yes
• Supply Current (typ): 1.6 uA
• Supply Voltage - Min: 1.8 V

Figure 6—Minimizing I
Programmable Reset Delay Time
The reset delay time can be programmed by
C
VCC through a resistor between 50kΩ and
200kΩ, the delay time is 380ms. When C
floated, the delay time is 24ms. In addition, a
capacitor connected C
used to get the user’s programmable delay time
from 2.1ms to 10s. The three configures can be
found in Figure 7(a)(b)(c).
The external capacitor C
150pF. For a given delay time, the capacitor
value can be calculated using the following
equation:
MP6400 Rev. 0.91
12/16/2009
3.3V
DELAY
Figure 7—Programmable Configurations to
C
50k
DELAY
MP6400DJ-33
C
configure. When C
SENSE
DELAY
over V
380ms Delay
C
DELAY
(
GND
nF
(a)
3.3V
RESET
3.3V
the Reset Delay Time
)
VCC
MP6400 – LOW QUIESCENT CURRENT PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT
=
CC
[
t
MP6400DJ-33
C
by External MOSFET
SENSE
D
DELAY
(
MR
s
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
GND
)
(c)
−
MP6400DJ-33
CC
DELAY
RESET
DELAY
3.3V
4.99
VCC
VCC
When
DELAY
GND
must be larger than
to GND could be
SENSE
RESET
MP6400DJ-33
×
C
SENSE
DELAY
10
24ms Delay
MR
is connected to
−
GND
(b)
4
(
RESET
Signal isn’t
s
VCC
)]
© 2009 MPS. All Rights Reserved.
×
www.MonolithicPower.com
107
DELAY
The reset delay time is determined by the charge
time of external capacitor. While SENSE is above
V
current source is enabled and starts to charge
the capacitor to set the delay time. When the
capacitor voltage rises to 1.13V, the
asserted. The capacitor will be discharged when
the
may cause errors of the delay time. A ceramic
capacitor
recommended.
SENSE Voltage Transients Immunity
The MP6400 can be immune to SENSE pin short
negative
duration is 17us while overdrive is 5%. A shorter
negative transient can not assert the
output. The effective duration is relative to the
threshold overdrive, as shown in Figure 8.
IT
Figure 8
and
R E S E T
Sense Threshold Overdrive Voltage
100
M R
10
1
is again asserted. Stray capacitance
transient.
—Maximum Transient Duration vs.
SENSE THRESHOLD OVERDRIVE(%)
0
Maximum SENSE Transient
Duration vs.SENSE Threshold
Overdrive Voltage
with
is a logic high, the internal 140nA
10
low
20
The
leakage
30
maximum
40
is
50
R E S E T
immune
strongly
is de-
R E S E T
9