LTC1921CS8 查看數據表（PDF） - Linear Technology

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LTC1921CS8

Dual –48V Supply and Fuse Monitor

Linear Technology 

LTC1921

ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. (Note 5) RTN = 0V, VA = –48V, VB = –48V, FUSE A = –48V,

FUSE B = –48V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Output Switch Off Leakage

500

pA

Output Switch Resistance in Undervoltage Lockout,

VA = VB = –10V, IOUT = 10mA

q

OUT F, OUT A, OUT B

VA = –10V, VB = 0V, IOUT = 10mA

q

VA = 0V, VB = –10V, IOUT = 10mA

q

60

Ω

80

Ω

80

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: The LTC1921C and LTC1921I are guaranteed functional over the

operating temperature range of –40°C to 85°C.

Note 4: The LTC1921C is guaranteed to meet specified performance from

0°C to 70°C. The LTC1921C is designed, characterized and expected to

meet specified performance from –40°C to 85°C but is not tested or QA

sampled at these temperatures. The LTC1921I is guaranteed to meet

specified performance from –40 t0 85°C.

Note 5: All currents into device pins are positive; all currents out of device

pins are negative. All voltages are referenced to RTN unless otherwise

specified.

TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current vs Supply Voltage

400

VA = VB = VFUSEA = VFUSEB

350

300

250

200

150

100

50

0

0 10 20 30 40 50 60 70 80 90 100

SUPPLY VOLTAGE (V)

1921 G01

Undervoltage Recovery Threshold

vs Temperature

–42.5

–42.6

–42.7

–42.8

–42.9

–43.0

–43.1

–43.2

–43.3

–43.4

–43.5

–50 –30 –10 10 30 50 70 90

TEMPERATURE (°C)

1921 G04

Supply Current vs Temperature

180

IA + IB

160

140

120

100

IA, IB

80

60

40 VA = –48V

VB = –48V

20 VFUSEA = –48V

VFUSEB = –48V

0

–50 –30 –10 10 30 50

TEMPERATURE (°C)

70 90

1921 G02

Overvoltage Threshold

vs Temperature

–68.0

–68.5

–69.0

–69.5

–70.0

–70.5

–71.0

–71.5

–72.0

–50 –30 –10 10 30 50

TEMPERATURE (°C)

70 90

1921 G05

Undervoltage Threshold

vs Temperature

–37.5

–37.7

–37.9

–38.1

–38.3

–38.5

–38.7

–38.9

–39.1

–39.3

–39.5

–50 –30 –10 10 30 50

TEMPERATURE (°C)

70 90

1921 G04

Overvoltage Hysteresis

vs Temperature

1.50

1.45

1.40

1.35

1.30

1.25

1.20

1.15

1.10

1.05

1.00

–50 –30 –10 10 30 50

TEMPERATURE (°C)

70 90

1921 G06

1921f

3

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