ELECTRICAL CHARACTERISTICS

(2.7 V < V

< 30 V; Industrial Grade: 0°C < T < 70°C; Commercial Grade: 0°C < T < 125°C; unless otherwise noted)

CC

J

J

CHARACTERISTICS

TEST CONDITIONS

MIN

TYP

MAX

UNIT

FB Reference Voltage

FB Input Current

FB Reference Voltage Line

Regulation

Error Amp

Transconductance

Error Amp Gain

Error Amp Gain

Negative

V Source Current

C

V Sink Current

C

V High Clamp Voltage

C

V

Low Clamp Voltage

C

Base Operating Frequency

Reduced Operating Frequency

Maximum Duty Cycle

FB Frequency Shift Threshold

Sync Range

Sync Pulse Transition

Threshold

SS Bias Current

Shutdown Threshold

Shutdown Delay

Error Amplifier Section

Oscillator Section

Sync/ Shutdown Section

Sync Range

Shutdown Threshold

V tied to FB; measure at FB

C

FB = V

REF

V = FB

C

I

= ±25 µA

VC

(Note 2)

(Note 2)

FB = 1.0V, V =1.25V

C

FB = 1.5V, V = 1.25V

C

FB = 1.0V; V sources 25µA

C

FB = 1.5V, V sinks 25µA

C

Reduce V from 1.5V until switching

C

stops

FB = 1.0V

FB = 0V

-

Frequency drops to reduced

operating frequency

Rise time = 20ns

SS = 0V

SS = 3.0V

-

2.7 V

V

12V

CC

12 V < V

30V

CC

1.246

-1.0

-

300

200

100

25

200

1.5

0.25

0.75

230

30

90

0.36

320

2.5

-15

-

0.5

12

12

1.276

0.1

0.01

550

500

180

50

625

1.7

0.50

1.05

280

52

94

0.40

-

-

-3.0

3.0

0.85

80

36

V

µA

% / V

µMho

V / V

V / V

µA

µA

V

V

V

kHz

kHz

%

V

kHz

V

µA

µs

1.300

1.0

0.03

800

-

320

90

1500

1.9

0.65

1.30

310

120

-

0.44

500

-

-

8.0

350

200

1.2

V Threshold

C

(Note 1) The maximum package power dissipation must be observed.

(Note 2) Guaranteed by design, not 100% tested in production.

-

µs

Power Management

FC3255 1.5A PWM Switching Regulators