10

FN6482.0

February 26, 2008

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:

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

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

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

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

7. Parts are 100% tested at +25°C. Temperature limits established by characterization and are not production tested.

Electrical Specifications

Operating Conditions: VCC = 5V, Unless Otherwise Specified. (Continued)

PARAMETER

TEST CONDITIONS

MIN

(Note 7)

TYP

MAX

(Note 7)

UNITS

ISL6334, ISL6334A