3

LTC1174

LTC1174-3.3/LTC1174-5

ELECTRICAL C

C

–40

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Feedback Voltage

LTC1174I

1.18

1.25

1.31

V

Current Sunk by Pin 2

0.75

1.2

2

mA

Current Limit

0.54

0.60

0.78

A

0.34

A

Switch Off-Time (Note 5)

2

4

6

µs

temperature range.

LTC1174CN8, LTC1174CN8-3.3, LTC1174CN8-5:

LTC1174CS8, LTC1174CS8-3.3, LTC1174CS8-5:

Note 2: Guaranteed by design.

Note 3: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

Note 4: Current into pin 6 only, measured without electrolytic input

capacitor.

Note 5: The off-time is wafer-sort trimmed.

Note 6: The LTC1174I is not tested and not quality assurance sampled at

–40

°C and 85°C. These specifications are guaranteed by design and/or

correlation.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input DC Supply Current (Note 3)

Active Mode

450

600

µA

450

600

µA

Sleep Mode

130

180

µA

130

180

µA

SHUTDOWN (Note 4)

1

10

µA

2

25

µA

Low-Battery Trip Point

1.25

1.4

V

Current into Pin 3

0.5

µA

Current Sunk by Pin 2

1.0

1.2

1.5

mA

0.6

0.8

1.5

mA

Comparator Hysteresis

LTC1174/LTC1174HV

7.5

15

30

mV

Current Limit

q

0.54

0.60

0.78

A

q

0.27

0.34

0.50

A

ON Resistance of Switch

LTC1174

q

0.75

1.30

Ω

LTC1174HV

q

0.90

1.55

Ω

Switch Off-Time (Note 5)

3

4

5

µs

SHUTDOWN Pin High

Minimum Voltage at Pin 8 for Device to Be Active

1.2

V

SHUTDOWN Pin Low

Maximum Voltage at Pin 8 for Device to Be in Shutdown

0.75

V

SHUTDOWN Pin Input Current

0.5

µA

2.0

SHUTDOWN Pin Input Current

0

0.5

µA