Datasheet

15
LTC2901
2901fb
TYPICAL APPLICATIO S
U
Quad Supply Monitor with Watchdog Timer Disabled
5V, 3V, 1.8V, 12V (ADJ)
COMP2
COMP4
V2
V4
V
REF
V
PG
GND
CWT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
COMP3
COMP1
V3
V1
CRT
RST
WDO
WDI
R3
2.15M
1%
SYSTEM
RESET
1.8V 3V
12V
5V
C
RT
R4
100k
1%
LTC2901
V
TRIP
= 11.25V
2901 TA02
5V, –5V Monitor with Watchdog Timer Disabled and Unused
V2, V3 Inputs Pulled Above Trip Thresholds
COMP2
COMP4
V2
V4
V
REF
V
PG
GND
CWT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
COMP3
COMP1
V3
V1
CRT
RST
WDO
WDI
R4
121k
1%
R3
464k
1%
SYSTEM
RESET
–5V
5V
R2
86.6k
1%
R1
16.2k
1%
LTC2901
V
TRIP
= –4.64V
2901 TA03
C
RT
Quad Supply Monitor with LED Undervoltage Indicators
5V, 3.3V, 2.5V, 1.5V
COMP2
COMP4
V2
V4
V
REF
V
PG
GND
CWT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
COMP3
COMP1
V3
V1
CRT
RST
WDO
WDI
SYSTEM RESET
WATCHDOG STATUS
WDI
1.5V
3.3V
5V
2.5V
R2
47.5k
1%
R1
53.6k
1%
R
L2
1k
LED
LTC2901
2901 TA04
C
RT
C
WT
R
L4
1k
LED
R
L3
1k
LED
R
L1
1k
LED
Generate RESET Pulse Through Watchdog Timeout (LTC2901-1/LTC2901-2)
2901 TA06
COMP2
COMP4
V2
V4
V
REF
V
PG
GND
CWT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
COMP3
COMP1
V3
V1
CRT
RST
WDO
WDI
ADJ
10k
3.3V
5V
RST
WDI
C
WT
LTC2901
C
RT
t
RST
t
WD
~20μs
RST
WDI
WDO
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.