© 2004 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5234 • Rev. 2.0.0

5

Electrical Characteristics

Recommended operating conditions, unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

Power Supplies

LDRV, HDRV Open;

Regulation Point

850

1300

µA

Shutdown (EN-0)

5

15

µA

VIN Pin = Input Voltage

Source

10

20

30

µA

VIN Pin = GND

7

15

20

µA

1

µA

UVLO Threshold

4.30

4.55

4.75

V

Falling

4.10

4.27

4.50

UVLO Hysteresis

0.1

0.5

V

Oscillator

Frequency

255

300

345

KHz

510

600

690

Ramp Amplitude

2

V

1.25

Ramp Offset

0.5

V

G

125

mV/V

250

Reference and Soft-Start

Internal Reference Voltage

0.891

0.900

0.909

V

Soft-Start Current

At Startup

5

µA

Soft-Start Complete Threshold

1.5

V

PWM Converter

Load Regulation

-1

+1

%

50

80

150

nA

VOUT Pin Input Impedance

40

55

65

K

Ω

% of Set Point,

2µs Noise Filter

70

75

80

%

Over-Current Threshold

115

144

172

%

UVLO

Over-Voltage Threshold

% of Set Point,

2µs Noise Filter

113

120

µA

Output Drivers

HDRV Output Resistance

Sourcing

8.0

15.0

Ω

Sinking

3.2

4.0

LDRV Output Resistance

Sourcing

8.0

15.0

Ω

Sinking

1.5

2.4

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