LTC1921CMS8 반도체 회로 부품 판매점
Dual .48V Supply and Fuse Monitor
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 Linear Technology |
FEATURES
s Independently Monitors Two –48V Supplies for
– Undervoltage Faults: –38.5V ±1VMAX
– Overvoltage Faults: –70V ±1.5VMAX
s Accurately Detects Undervoltage Fault Recovery:
–43V ±0.5VMAX
s Monitors Two External Fuses
s Operates from –10V to –80V
s Tolerates DC Faults to –100V
s Tolerates Accidental Supply Reversal to 100V
s Withstands Transient Voltages Up to 200V/–200V
s Small Footprint: 8-Lead MSOP Package
s Requires No Precision External Components
s Specified from – 40°C to 85°C
U
APPLICATIO S
s Telecom Backplanes or Switch Cards
s Networking Backplanes or Switch Cards
s High Voltage Fuse Monitoring
Final Electrical Specifications
LTC1921
Dual –48V Supply
and Fuse Monitor
DESCRIPTIO
May 2002
The LTC®1921 monitors two independent – 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
–10V to –80V 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.
TYPICAL APPLICATIO
– 48V
RETURN
R1
100k
R2
100k
1
VA
3
RTN
4
OUT F
8
VB
LTC1921
2
FUSE A
75
FUSE B OUT A
47k 47k 47k
LOGIC
FUSE GOOD SUPPLY
MOC207
MOC207
SUPPLY A GOOD SUPERVISOR
µP
SUPPLY B GOOD LOGIC
COMMON
–48V LOAD
SUPPLY A
–48V
SUPPLY B
–48V
F1
F2
6
OUT B
D1 MURS320
D2 MURS320
MOC207
R3
47k
1/4W
1921 TA01
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.
1921i
1
LTC1921
ABSOLUTE AXI U RATI GS
(Note 1) All voltages referred to RTN
Supply Voltage
(VA, VB, FUSE A, FUSE B) ....................... 100V to –100V
Transient Voltage (VA, VB, FUSE A, FUSE B)
(Note 2) ........................................................ 0V to 200V
Transient Voltage (VA, VB, FUSE A, FUSE B)
(Note 2) ...................................................... 0V to –200V
OUT A, OUT B, OUT F Pins ......................... 0.3V to – 8V
Maximum Junction Temperature ......................... 150°C
Operating Temperature Range
LTC1921CMS8 ........................................ 0°C to 70°C
LTC1921IMS8 .................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
VA 1
FUSE A 2
RTN 3
OUT F 4
TOP VIEW
8 VB
7 FUSE B
6 OUT B
5 OUT A
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 250°C/W
ORDER PART
NUMBER
LTC1921CMS8
LTC1921IMS8
MS8 PART MARKING
LTZV
LTZU
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3) RTN = 0V, VA = –48V, VB = –48V, FUSE A = –48V,
FUSE B = –48V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
Power Supply
Supply Voltage Range (RTN – VA, RTN –␣ VB)
Supply Current (IA + IB)
q 10
q
80
–160 –250
– 300
Supply Monitor
Undervoltage Threshold
q –39.5
– 37.5
Undervoltage Recovery Threshold
q –43.5
– 42.5
Overvoltage Threshold
q –71.5
– 68.5
Overvoltage Threshold Hysteresis
q1
1.6
Fuse Monitor
Input Resistance, FUSE A, FUSE B
11
Fuse Comparison Threshold |VFUSEA – VA|, |VFUSEB – VB|
LTC1921C
LTC1921I
2.5
q 0.9
4.5
q 0.5
4.5
Output
Propagation Delay
Output Switch Resistance, OUT F, OUT A, OUT B
Output Switch Off Leakage
COUT = 100pF, Overdrive = 1V
VA = VB = –35V, VFUSEA = VFUSEB = 0V
IOUT = 10mA
q
220
25
50
500
Output Switch Resistance in Undervoltage Lockout,
OUT F, OUT A, OUT B
VA = VB = –10V, IOUT = 10mA
VA = –10V, VB = 0V, IOUT = 10mA
VA = 0V, VB = –10V, IOUT = 10mA
q
q
q
60
80
80
UNITS
V
µA
µA
V
V
V
V
MΩ
V
V
V
µs
Ω
Ω
pA
Ω
Ω
Ω
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Transient voltage for less than 10µs. This parameter is not 100%
tested. Voltage should not exceed 200V between any two pins.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to RTN unless otherwise
specified.
1921i
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