LT1373CS8 datasheet(3/12 Pages) LINER

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LT1373

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Switch Breakdown Voltage

LT1373

LT1373HV

°C ≤ TJ ≤ 125°C

– 40

°C ≤ TJ ≤ 0°C (I Grade)

VSAT

Output Switch “On” Resistance

ISW = 1A

0.5

0.85

Ω

ILIM

Switch Current Limit

Duty Cycle = 50%

1.5

1.9

2.7

Duty Cycle = 80% (Note 2)

1.3

1.7

2.5

∆IIN

Supply Current Increase During Switch On-Time

mA/A

∆ISW

Control Voltage to Switch Current

2A/V

Transconductance

Minimum Input Voltage

2.4

2.7

Supply Current

2.7V

≤ VIN ≤ 25V

1.5

Shutdown Supply Current

2.7V

≤ VIN ≤ 25V, VS/S ≤ 0.6V

°C ≤ TJ ≤ 125°C

µA

– 40

°C ≤ TJ ≤ 0°C (I Grade)

µA

Shutdown Threshold

2.7V

≤ VIN ≤ 25V

0.6

1.3

Shutdown Delay

100

µs

S/S Pin Input Current

≤ VS/S ≤ 5V

–10

µA

Synchronization Frequency Range

300

340

kHz

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

SWITCH CURRENT (A)

0.6

0.8

1.0

1.6

LT1373 • G01

0.4

0.2

0.5

0.7

0.9

0.3

0.1

0.4

0.8

1.2

2.0

1.4

0.2

0.6

1.0

1.8

100

°C

150

°C

–55

°C

Switch Saturation Voltage

vs Switch Current

TEMPERATURE (

°C)

–50

1.8

2.0

2.2

2.4

2.6

050

100

150

LT1373 • G03

2.8

3.0

–25

125

Minimum Input Voltage

vs Temperature

DUTY CYCLE (%)

1.0

2.0

3.0

0.5

1.5

2.5

LT1373 • G02

100

°C AND

125

°C

–55

°C

Switch Current Limit

vs Duty Cycle

The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VIN = 5V, VC = 0.6V, VFB = VREF, VSW, S/S and NFB pins open, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

Note 2: For duty cycles (DC) between 50% and 90%, minimum

guaranteed switch current is given by ILIM = 0.667 (2.75 – DC).

TYPICAL PERFOR A CE CHARACTERISTICS

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