8

FN6383.1

December 5, 2007

PGOOD Rise Time

RPULLUP = 10k to 3.3V

0.05

µs

PGOOD Fall Time

RPULLUP = 10k to 3.3V

0.05

µs

EARLY WARNING FUNCTIONS

Undervoltage Lockout Rising (VCC_5V Pin)

4.25

4.45

4.50

V

Undervoltage Lockout Falling (VCC_5V Pin)

3.95

4.20

4.40

V

Early Warning Voltage Rising (VIN Pin; ISL9440, ISL9440A only)

5.75

5.90

V

Early Warning Voltage Falling (VIN Pin; ISL9440, ISL9440A only)

5.30

5.55

V

RST

RST Voltage Low

I_SINK = 4mA

0.4

V

RST Leakage Current

RST = 5V

0.025

1

µA

RST Rise Time

RPULLUP = 10k to 3.3V

0.05

µs

RST Fall Time

RPULLUP = 10k to 3.3V

0.05

µs

PGOOD/RST TIMING RISING

VIN/VOUT Rising Threshold to PGOOD High Rising

100

200

300

ms

PGOOD Rising to RST Rising

1.0

µs

PGOOD/RST TIMING FALLING

VIN/VOUT Falling Threshold to PGOOD Falling

40

70

100

µs

PGOOD Falling to RST Falling

4.5

5.5

6.5

µs

OVER VOLTAGE PROTECTION

OV Trip Point

118

%

OVER CURRENT PROTECTION

Overcurrent Threshold (OCSET_) (Note 5)

ROCSET = 55k

Ω

32

µA

Full Scale Input Current (ISEN_) (Note 5)

15

µA

Overcurrent Set Voltage (OCSET_)

1.70

1.75

1.80

V

OVER-TEMPERATURE

Over-Temperature Shutdown

150

°C

Over-Temperature Hysteresis

20

°C

NOTES:

VCC_5V pin. (Refer to the Pin Descriptions section for more details.)

4. Operating current is the supply current consumed when the device is active but not switching. It does not include gate drive current.

5. Limits established by characterization and are not production tested.

6. Check Note 2 for VCC_5V and VIN configurations at 5V ±10% input applications. ISL9440, ISL9440A’s PGOOD signal will fall LOW when VIN

pin voltage drops below 5.55V (TYP), which results from the early warning detection on VIN pin voltage. ISL9441 doesn’t have an early warning

function, so when VIN pin voltage is below 5.55V, PGOOD will not be pulled LOW; ISL9441’s PGOOD only shows the output voltage regulation

status.

Electrical Specifications

Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

ISL9440, ISL9440A, ISL9441