© 2008 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN2108 • Rev. 1.0.0

5

Electrical Specifications

Electrical specifications are the result of using the circuit shown in Figure 1 unless otherwise noted.

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Power Supplies

8

12

mA

7

10

µA

4.1

4.3

4.5

V

Hysteresis

300

mV

Oscillator

255

300

345

KHz

f

Frequency

540

600

660

KHz

Minimum On-Time

(2)

50

65

ns

Ramp Amplitude, peak-to–peak

0.53

V

Minimum Off-Time

(2)

100

150

ns

Reference

FAN2108MPX, 25°C

794

800

806

mV

Reference Voltage (see Figure 4 for

Temperature Coefficient)

FAN2108EMPX, 25°C

795

800

805

mV

Error Amplifier

G

DC Gain

(2)

80

85

dB

BW

Gain Bandwidth Product

(2)

12

15

MHz

Output Voltage

0.4

3.2

V

Output Current, Sourcing

1.5

2.2

mA

Output Current, Sinking

0.8

1.2

mA

FB Bias Current

-850

-650 -450

nA

Protection and Shutdown

Current Limit

Description)

12

15

18

A

-11

-10

-9

µA

Over-Temperature Shutdown

+155

°C

Over-Temperature Hysteresis

Internal IC Temperature

+30

°C

Over-Voltage Threshold

Two Consecutive Clock Cycles

110

115

Under-Voltage Shutdown

16 Consecutive Clock Cycles

68

73

78

Fault Discharge Threshold

Measured at FB Pin

250

mV

250

mV

Soft-Start

5.3

ms

Fault Enable/SSOK (T1.0)

Frequency=600KHz

6.7

ms

Note:

2.

Specifications guaranteed by design and characterization; not production tested.