LTC2909
16
2909fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 0807 REV B • PRINTED IN USA
TYPICAL APPLICATIO
U
RELATED PARTS
Automotive Supply System with Overvoltage, Overcurrent and Overtemperature Protection and Undervoltage Reset
PART NUMBER DESCRIPTION COMMENTS
LTC1326/LTC1326-2.5 Micropower Precision Triple Supply Monitor for
5V/2.5V, 3.3V and ADJ
4.725V, 3.118V, 1V Threshold (±0.75%)
LTC1536 Precision Triple Supply Monitor for PCI Applications Meets PCI t
FAIL
Timing Specifi cations
LTC1540 Nanopower Comparator with Reference Adjustable Hysteresis
LTC1726-2.5/LTC1726-5 Micropower Triple Supply Monitor for 2.5V/5V, 3.3V
and ADJ
Adjustable Reset and Watchdog Time-Outs
LTC1727/LTC1728 Micropower Triple Supply Monitor with Open-Drain
Reset
Individual Monitor Outputs in MSOP/5-Lead SOT-23
LTC1985-1.8 Micropower Triple Supply Monitor with Push-Pull
Reset Output
5-Lead SOT-23 Package
LTC2900 Programmable Quad Supply Monitor Adjustable Reset, 10-Lead MSOP and 3mm × 3mm 10-Lead DFN
Package
LTC2901 Programmable Quad Supply Monitor Adjustable Reset and Watchdog Timer, 16-Lead SSOP Package
LTC2902 Programmable Quad Supply Monitor Adjustable Reset and Tolerance, 16-Lead SSOP Package, Margining
Functions
LTC2903 Precision Quad Supply Monitor 6-Lead SOT-23 Package, Ultralow Voltage Reset
LTC2904/LTC2905 3-State Programmable Precision Dual Supply Monitor Adjustable Tolerance and Reset Timer, 8-Lead SOT-23 Package
LTC2906/LTC2907 Precision Dual Supply Monitor 1-Selectable and
1 Adjustable
Separate V
CC
Pin, RST/
⎯
R
⎯
S
⎯
T Outputs/Adjustable Reset Timer
LTC2908 Precision Six Supply Monitor (Four Fixed and
2 Adjustable)
8-Lead SOT-23 and DDB Packages
LT6700 Micropower, Low Voltage, Dual Comparator with
400mV Reference
6-Lead SOT-23 Package
V
CC
ADJ1
LTC2909-2.5
REF
ADJ2
RST
SEL
TMR
R
P1A
102k
GND
V
CC
ADJ1
LTC2909-2.5
REF
ADJ2
RST
SEL
TMR
V
CC
ADJ1
LTC2909-2.5
REF
ADJ2
RST
SEL
TMR
GND GND
R
P1B
340k
R
P1C
51.1k
R
P1E
221k
R
P1D
49.9k
NTC THERMISTOR
NTHS-1206N01
R25 = 100k
R = 10.7k AT 85°C
R
REF
10.7k
R
PU1
4.7k
R
L2
100k
C
G
10nF
C
BYP1
100nF
R
L1
4.7k
R
FB2
100k
R
FB1
10k
R
CC
4.7k
R
P2A
2.49M
R
P2B
2.05M
R
P2C
221k
R
P2D
1.07M
R
P2E
1.15M
R
PU2
10k
2909 TA05
R
G2
10Ω
R
G1
1k
Q2
Q1
D1
2N6507
M1
IRLZ34
D1: 1N5238B OR SIMILAR
Q1, Q2: FFB2227 OR SIMILAR
V
IN
12V
R
S
0.01Ω
C
T
680nF
C
BYP2
100nF
ON
FB
GATESENSE
TIMER
CIRCUIT BREAKER AND CROWBAR
GND
LT1641-2PWRGD
V
CC
DC/DC
2.5V
3.3V
DC/DC
C
BYP3
100nF
SYSTEM
12V OV AND 3.3V OV DETECT 2.5V OV AND T > 85°C DETECT 12V, 3.3V and 2.5V UV DETECT
