LTC1921IMS8 Linear Technology, LTC1921IMS8 Datasheet

IC DUAL PWR SUPPLY MONITOR 8MSOP

LTC1921IMS8

Manufacturer Part Number
LTC1921IMS8
Description
IC DUAL PWR SUPPLY MONITOR 8MSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LTC1921IMS8

Applications
Dual Power Supply Monitor
Voltage - Supply
10 V ~ 80 V
Current - Supply
160µA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Input
-

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1921IMS8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC1921IMS8
Manufacturer:
LT
Quantity:
20 000
Part Number:
LTC1921IMS8#TRPBF
Manufacturer:
LT
Quantity:
4 818
Part Number:
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Manufacturer:
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Quantity:
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Company:
Part Number:
LTC1921IMS8#TRPBF
Quantity:
2 500
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Withstands Transient Voltages Up to 200V/–200V
Requires No Precision External Components
Independently Monitors Two –48V Supplies for
– Undervoltage Faults: –38.5V 1V
– Overvoltage Faults: –70V 1.5V
Accurately Detects Undervoltage Fault Recovery:
–43V 0.5V
Monitors Two External Fuses
Operates from –10V to –80V
Tolerates DC Faults to –100V
Tolerates Accidental Supply Reversal to 100V
Small Footprint: 8-Lead MSOP Package
Specified from – 40 C to 85 C
Telecom Backplanes or Switch Cards
Networking Backplanes or Switch Cards
High Voltage Fuse Monitoring
SUPPLY A
SUPPLY B
MAX
–48V
–48V
U
RETURN
– 48V
F1
F2
100k
R1
U
MAX
R2
100k
1
8
2
7
MAX
V
V
FUSE A
FUSE B
A
B
D1 MURS320
D2 MURS320
LTC1921
RTN
3
OUT A
OUT B
OUT F
4
5
6
MOC207
MOC207
MOC207
R3
47k
1/4W
DESCRIPTIO
The LTC
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
–10V to –80V with a typical power dissipation of less than
10mW.
The LTC1921 is available in 8-pin MSOP and SOIC pack-
ages.
47k
, LTC and LT are registered trademarks of Linear Technology Corporation.
47k
®
1921 monitors two independent – 48V supplies,
SUPPLY A GOOD
SUPPLY B GOOD
47k
FUSE GOOD
and Fuse Monitor
Dual –48V Supply
U
SUPERVISOR
COMMON
SUPPLY
LOGIC
LOGIC
P
–48V LOAD
1921 TA01
LTC1921
1
1921f

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LTC1921IMS8 Summary of contents

Page 1

... The LTC1921 operates from –10V to –80V with a typical power dissipation of less than 10mW. The LTC1921 is available in 8-pin MSOP and SOIC pack- ages. , LTC and LT are registered trademarks of Linear Technology Corporation. 47k 47k 47k R2 100k ...

Page 2

... LTC1921C/LTC1921I .......................... – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER LTC1921CMS8 FUSE A 2 LTC1921IMS8 RTN 3 OUT F 4 MS8 PART MARKING 8-LEAD PLASTIC SO LTZV T JMAX LTZU The denotes specifications which apply over the full operating = 25 C. (Note 5) RTN = 0V, V ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T FUSE B = –48V, unless otherwise noted. PARAMETER Output Switch Off Leakage Output Switch Resistance in Undervoltage Lockout, OUT F, OUT A, OUT B Note 1: Absolute Maximum Ratings are those ...

Page 4

LTC1921 W U TYPICAL PERFOR A CE CHARACTERISTICS Fuse Window Positive Threshold vs Temperature 2.7 2.5 2.3 2.1 1.9 1.7 1.5 –50 –30 – TEMPERATURE ( C) 1921 G07 Undervoltage Response Time 10000 T = ...

Page 5

CTIO S V (Pin 1): Supply to be Monitored. The voltage at this pin A is compared to the valid supply voltage window and the result is output at OUT A (Pin 5). Supply current ...

Page 6

LTC1921 W BLOCK DIAGRA REGULATOR RTN 3 REF FUSE A FUSE – + – OUT F – + – + – + – 5 OUT A + ...

Page 7

U U APPLICATIO S I FOR ATIO Supply Monitoring The LTC1921 is designed to monitor dual – 48V power supplies. This is accomplished with precision window comparators and an accurate bandgap reference, as well as internal level shifting circuitry. The ...

Page 8

LTC1921 U U APPLICATIO S I FOR ATIO internal impedance to the return (RTN) pin. The applica- tion must be designed so that an open fuse condition will force the fuse input (FUSE A or FUSE outside ...

Page 9

U U APPLICATIO S I FOR ATIO –48V RETURN R1 R2 100k 100k SUPPLY A –48V F2 SUPPLY B –48V –48V RETURN SUPPLY A –48V SUPPLY B –48V W U 47k 3 MOCD207 RTN 47k ...

Page 10

LTC1921 U TYPICAL APPLICATIO S 10 1921f ...

Page 11

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 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. ...

Page 12

... RTN 4 V OUT F A SUPPLY GOOD LTC1921 V B MOC207 5 FUSE A OUT A LOGIC COMMON 6 FUSE B OUT B 47k 1/4W 1921 TA06 D3 GREEN 4 D4 GREEN 5 D5 GREEN 6 R3 5.1k 2W –48V OUT 1921 TA03 LT/TP 0902 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2002 1921f ...

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