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LTC1921IMS8 Datasheet

  • LTC1921IMS8

  • Dual .48V Supply and Fuse Monitor

  • 12頁(yè)

  • LINER

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Final Electrical Specifications
LTC1921
Dual 鈥?8V Supply
and Fuse Monitor
FEATURES
s
May 2002
DESCRIPTIO
s
s
s
s
s
s
s
s
s
Independently Monitors Two 鈥?8V Supplies for
鈥?Undervoltage Faults: 鈥?8.5V
鹵1V
MAX
鈥?Overvoltage Faults: 鈥?0V
鹵1.5V
MAX
Accurately Detects Undervoltage Fault Recovery:
鈥?3V
鹵0.5V
MAX
Monitors Two External Fuses
Operates from 鈥?0V to 鈥?0V
Tolerates DC Faults to 鈥?00V
Tolerates Accidental Supply Reversal to 100V
Withstands Transient Voltages Up to 200V/鈥?00V
Small Footprint: 8-Lead MSOP Package
Requires No Precision External Components
Specified from 鈥?40擄C to 85擄C
The LTC
廬
1921 monitors two independent 鈥?48V supplies,
including their fuses, and drives up to three optoisolators
to indicate status, in accordance with standard backplane
specifications. Requiring only three noncritical resistors
and optoisolators, the LTC1921 replaces multiple voltage
comparators, a voltage reference and several precision
resistors.
The monitor features dual supply overvoltage and under-
voltage detection circuits. The preset trip thresholds in-
clude overvoltage, undervoltage and undervoltage recovery
that are guaranteed over temperature and meet or exceed
common backplane specifications. Additional built-in cir-
cuitry detects the condition of supply fuses. Overvoltage
and undervoltage detectors ignore fast supply transients,
eliminating false detection. The LTC1921 operates from
鈥?0V to 鈥?0V with a typical power dissipation of less than
10mW.
The LTC1921 is available in an 8-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Telecom Backplanes or Switch Cards
Networking Backplanes or Switch Cards
High Voltage Fuse Monitoring
TYPICAL APPLICATIO
鈥?48V
RETURN
R1
100k
R2
100k
3
RTN
1
8
2
7
V
A
V
B
LTC1921
FUSE A
FUSE B
OUT A
5
MOC207
OUT F
MOC207
4
47k
47k
47k
FUSE GOOD
SUPPLY A GOOD SUPERVISOR
碌P
SUPPLY B GOOD
OUT B
F1
F2
D1 MURS320
D2 MURS320
6
MOC207
R3
47k
1/4W
1921 TA01
SUPPLY A
鈥?8V
SUPPLY B
鈥?8V
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.
U
LOGIC
SUPPLY
LOGIC
COMMON
U
U
鈥?8V LOAD
1921i
1

LTC1921IMS8 產(chǎn)品屬性

  • LTC1921

  • 50

  • 集成電路 (IC)

  • PMIC - 電源控制器，監(jiān)視器

  • -

  • 雙路電源監(jiān)控器

  • -

  • 10 V ~ 80 V

  • 160µA

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）

  • 8-MSOP

  • 管件

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