UC3550

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 10

www.unisonic.com.tw

QW-R502-082,A

ABSOLUTE MAXIMUM RATING

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

-0.3~8

V

EXT Voltage

-0.3 ~ 8

V

EXT Sink/Source Current

-150 ~ +150

mA

CE Input Voltage Range

-0.3 ~ 12.0

V

CE Input Current Range

-155 ~ 155

mA

Power Dissipation (Ta=25℃)

500

mW

Junction Temperature

+150

℃

Operating Temperature

-40 ~ +85

℃

Storage Temperature

-55 ~ +150

℃

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA

PARAMETER

SYMBOL

RATINGS

UNIT

Thermal Resistance Junction to Air

250

℃

/W

UC3550-3.3V

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

OSCILLATOR

Frequency

240

300

360

kHz

Frequency Temperature Coefficient

f

△

Ta=-40℃ ~ 85℃

0.10

%/℃

Maximum PWM Duty Cycle

70

80

90

%

Minimum Start-up Voltage

800

900

mV

Minimum Start-up Voltage

900

1000

mV

Minimum Start-up Voltage

Temperature Coefficient

V

-1.6

mV/℃

Minimum Operation Hold Voltage

600

700

mV

Soft-Start Time

60

250

ms

CE (PIN 1)

900

mV

CE Input Voltage：

High State, Device Enabled

Low State, Device Disabled

680

mV

-0.5

0

0.5

µA

CE Input Current：

High State, Device Enabled

Low State, Device Disabled

0

0.15

0.5

µA

EXT (PIN 5)

EXT “H”

11

15

Ω

ON Resistance

EXT “L”

8

12

Ω

TOTAL DEVICE

Output Voltage

3.218

3.3

3.383

V

Output Voltage

temperature coefficient

V

Ta=-40 ~ 85℃

150

ppm/℃

Operating Current

103

160

µA

Stand-by Current

15

38

µA

Off-State Current

Ta=-40 ~ +85℃

0.6

1.5

µA

Efficiency

η

80

88

%