FAN5231

4

REV. 1.1.1 8/15/01

Electrical Specifications

(Recommended Operating Conditions, Unless Otherwise Noted. Refer to Figures 1, 2 and 3)

Parameter

Symbol

Test Condition

Min.

Typ. Max Units

VCC Supply

Nominal Supply Current

GATE1, GATE2 Open

–

2

2.5

mA

Shut-down Supply Current

–

30

50

µA

Battery Pin Supply Current

–

–

100

µA

Battery Pin Leakage Current at

Shut-Down

––

5

µA

Power-On Reset

Rising VCC Threshold

4.3

4.5

4.6

V

Falling VCC Threshold

3.9

4.1

4.3

V

Oscillator

Free Running Frequency

255

300

345

kHz

Ramp Amplitude, pk-pk

Vbat = 16V

–

2

–

V

Ramp Offset

–

0.5

–

V

Reference, DAC and Soft Start

VID0-VID4 Input Low Voltage

–

–

0.8

V

VID0-VID4 Input High Voltage

2.0

–

–

V

VID0-VID4 Pull-up Current to VCC

–

1

–

µA

DAC Voltage Accuracy

Measured at pin 18

-1.0

–

+1.0

%

Soft-Start Current During Start-Up

VSS = 0V…0.9V

18

27

36

µA

Soft-Start Current During Mode

Change

VSS = 0.925V…2.0V

350

500

650

µA

Enable

Enable Voltage Low

IC Inhibited

–

–

0.8

V

Enable Voltage High

IC Enabled

Input has internal pull-up current

source 2µA typ

2.0

–

–

V

PWM 1 Converter

Output Voltage

VOUT1

Defined by the current VID code

(Table 1)

0.925

–

2.0

V

Static Load Regulation

-2.0

–

+2.0

%

Under-Voltage Shut-Down Level

Percent of the voltage set by VID

code. Disabled during dynamic VID

code change.

70

75

80

%

Under-Voltage Shut Down Delay

–

1.4

–

µs

Over-Voltage

Percent of the voltage set by VID

code.

110

115

120

%

Over-Voltage Shut Down Delay

–

2.4

–

µs

Over-Current Comparator

Threshold

100

135

170

µA

PWM 2 Converter

Output Voltage

VOUT2

1.5

V

Load Regulation

-2.0

–

+2.0

%