LTC2912CDDB-3#TRPBF Linear Technology, LTC2912CDDB-3#TRPBF Datasheet - Page 10

• Manufacturer Part Number: LTC2912CDDB-3#TRPBF
• Description: IC VOLT MONITOR SNGL 8-DFN
• Manufacturer: Linear Technology
• Type: Simple Reset/Power-On Resetr

Specifications of LTC2912CDDB-3#TRPBF

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active High
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
LTC2912
The rise time on the UV, OV and 0V pins is limited by a
400k pull-up resistance to V
mates the output rise time (10% to 90%) at the UV, OV
and OV pins:
where R
OV/OV Latch (LTC2912-1, LTC2912-3)
With the LATCH pin held low, the OV pin latches low
(LTC2912-1) and the OV pin latches high (LTC2912-3)
when an OV condition is detected. The latch is cleared
by raising the LATCH pin high. If an OV condition clears
while LATCH is held high, the latch is bypassed and the
OV and OV pins behave the same as the UV pin with a
TYPICAL APPLICATIONS
10
t
RISE
Dual UV/OV Supply Monitor, 3.3V ±10% Tolerance
≈ 2.2 • R
PU
POWER
SUPPLY
is the pull-up resistance.
3.3V
PU
• C
R
1k
R
27.4k
R
4.53k
B
C
A
LOAD
C
2
3
BYP
VH
VL
GND
0.1μF
LTC2912-1
5
V
CC
CC
1
LATCH
TMR
SUPPLIES
. A similar formula esti-
POWER
4
OV
UV
C
22nF
TMR
6
7
Dual UV Supply Monitor, 3.3V, 2.5V, 10% Tolerance
8
3.3V
2.5V
TIMEOUT = 200ms
SYSTEM
54.9k
39.2k
2912 TA02
R
R
B1
B2
C
BYP
R
11k
R
11k
A2
A1
0.1μF
2
3
V
V
H
L
V
LTC2912-2
CC
1
GND
5
TMR
similar timeout period at the output. If LATCH is pulled
low while the timeout period is active, the OV and OV pins
latch as before.
Disable (LTC2912-2)
The LTC2912-2 allows disabling the UV and OV outputs
via the DIS pin. Pulling DIS high forces both outputs to
remain weakly pulled high, regardless of any faults that
occur on the inputs. However, if a UVLO condition oc-
curs, UV asserts and pulls low, but the timeout function
is bypassed. UV pulls high as soon as the UVLO condition
is cleared.
DIS has a weak 2μA (typical) internal pull-down current
guaranteeing normal operation with the pin left open.
DIS
4
OV
UV
6
7
8
POWER
SUPPLY
R
10k
48V Supply Monitor (<±10% = Powergood)
OV
48V
R
10k
UV
R
80.6k
R
37.4M
R
357k
B
C
A
SYSTEM
2
3
2912 TA04
VH
VL
0.1μF
C
GND
BYP
LTC2912-2
5
V
CC
1
R
200k
TMR
Z
DIS
OV
UV
4
2912 TA03
C
10nF TIMEOUT = 85ms
TMR
6
7
8
R
30k
PG
POWERGOOD
LED
2912fa