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LT4254

4254fb

TA = 25°C

VCC (V)

1.0

1.5

2.0

2.5

3.0

4254 G03

IPWRGD

PWRGD Pin Leakage Current

VPWRGD = 36V

0.1

µA

IINFB

FB Input Current

FB = 4.5V

–1

–0.1

µA

ITIMERPU

TIMER Pull-Up Current

●

– 60

– 120

–180

µA

ITIMERPD

TIMER Pull-Down Current

●

135

µA

VTHTIMER

TIMER Shut-Down Threshold Voltage

CTIMER = 10nF

●

4.3

4.65

DTIMER

Duty Cycle (RETRY Mode)

●

1.5

4.5

VRETRY(TH)

RETRY Threshold

●

0.4

0.8

1.2

IINRTR

RETRY Input Current

RETRY = GND

–120

–85

–40

µA

tPHLUV

UV Low to GATE Low

CGATE = 100pF

1.7

µs

tPLHUV

UV High to GATE High

CGATE = 100pF

µs

tPHLFB

FB Low to PWRGD Low

0.8

µs

tPLHFB

FB High to PWRGD High

3.2

µs

tPHLSENSE

(VCC – VSENSE) High to GATE Low

VCC – VSENSE = 275mV

2.5

µs

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

temperature range, otherwise specifications are at TA = 25°C. VCC = 24V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

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

of a device may be impaired.

Note 2: An internal clamp limits the GATE pin to a maximum of 11V above

VCC (under normal operating conditions). Driving this pin to a voltage

beyond the clamp voltage may damage the part.

TYPICAL PERFOR A CE CHARACTERISTICS

ICC vs VCC

SENSE Pin Regulation Voltage

vs Temperature, FB = 0V

SENSE Pin Regulation Voltage

vs Temperature, FB > 2V

TEMPERATURE (

°C)

–50

4254 G01

–25

100

125

TEMPERATURE (

°C)

–50

–25

4254 G02

100

125

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