8

FN6802.2

August 31, 2010

THERMAL MONITORING AND FAN CONTROL

TM Input Voltage for VR_FAN Trip

38.7

39.1

39.6

%VCC

TM Input Voltage for VR_FAN Reset

44.6

45.1

45.5

%VCC

TM Input Voltage for VR_HOT Trip

32.9

33.3

33.7

%VCC

TM Input Voltage for VR_HOT Reset

38.7

39.1

39.6

%VCC

Leakage Current of VR_FAN

With external pull-up resistor connected to VCC

-

-

5

µA

VR_FAN Low Voltage

-

-

0.3

V

Leakage Current of VR_HOT

With external pull-up resistor connected to VCC

-

-

5

µA

VR_HOT Low Voltage

-

-

0.3

V

VR READY AND PROTECTION MONITORS

Leakage Current of VR_RDY

With pull-up resistor externally connected to VCC

-

-

5

µA

VR_RDY Low Voltage

-

-

0.3

V

Undervoltage Threshold

VDIFF Falling

48

50

52

%VID

VR_RDY Reset Voltage

VDIFF Rising

57

59.6

62

%VID

Overvoltage Protection Threshold

Before valid VID

1.250

1.273

1.300

V

After valid VID, the voltage above VID

158

175

190

mV

Overvoltage Protection Reset Hysteresis

-

100

-

mV

NOTES:

6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization

and are not production tested.

7. These parts are designed and adjusted for accuracy with all errors in the voltage loop included.

8. Limits should be considered typical and are not production tested.

9. During soft-start, VDAC rises from 0V to 1.1V first and then ramp to VID voltage after receiving valid VID.

10. Soft-start ramp rate is determined by the adjustable soft-start oscillator frequency at the speed of 6.25mV per cycle.

temperature ranges, -40°C to +85°C or 0°C to +70°C. (Continued)

PARAMETER

TEST CONDITIONS

MIN

(Note 6)

TYP

MAX

(Note 6) UNITS

ISL6334D