3

LTC3831

3831f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SHDN Input High Voltage

q

2.4

V

SHDN Input Low Voltage

q

0.8

V

SHDN Input Current

q

0.1

1

µA

Soft-Start Source Current

q

–8

–12

–16

µA

Maximum Soft-Start Sink Current

1.6

mA

Undercurrent Limit

49.5

k

Ω

Driver Rise/Fall Time

q

80

250

ns

Driver Nonoverlap Time

q

25

120

250

ns

Maximum TG Duty Cycle

q

91

95

%

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

Note 2: All currents into device pins are positive; all currents out of device

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

specified.

Note 3: Supply current in normal operation is dominated by the current

needed to charge and discharge the external FET gates. This will vary with

the LTC3831 operating frequency, operating voltage and the external FETs

used.

Note 4: The LTC3831EGN is guaranteed to meet performance

specifications from 0

°C to 70°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 5: Rise and fall times are measured using 10% and 90% levels. Duty

cycle and nonoverlap times are measured using 50% levels.

Note 6: Guaranteed by design, not subject to test.

at 95% maximum duty cycle and for the current limit protection circuit to

be active.

Note 8: The current limiting amplifier can sink but cannot source current.

Under normal (not current limited) operation, the output current will be

zero.

Note 9: This IC includes overtemperature protection that is intended to protect

the device during momentary overload conditions. Junction temperature will

exceed 125

°C when overtemperature protection is active. Continuous opera-

tion above the specified maximum operating junction temperature may impair

device reliability.