UC3552

CMOS IC

UNISONIC TECHNOLOGIES CO., LTD

4 of 7

www.unisonic.com.tw

QW-R502-134.C



ABSOLU T E M AX I M U M RAT I N GS

PARAMETER

SYMBOL

RATINGS

UNIT

SW to GND

-0.3 ~ +14

V

-0.3 ~ +6

V

SS, EO to GND

V

RMS SW Pin Current

1.2

A

SOP-8

350

mW

MSOP-8

300

mW

Junction Temperature

+125

°C

Operating Temperature

-20 ~ +85

°C

Storage Temperature

-45 ~ +125

°C

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.



ELECT RI CAL CH ARACT ERI ST I CS

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input Supply Voltage

2.6

5.5

V

UVLO

is 40mV; SW remains off below this

level

2.25

2.38

2.52

V

0.21

0.35

Quiescent Current

1.2

5.0

mA

Shutdown Current

SHDN

= GND

0.1

10.0

µA

ERROR AMPLIFIER

Feedback Voltage

1.22

1.240

1.258

V

0

40

nA

Feedback-Voltage Line

Regulation

0.05

0.15

%/V

Transconductance

∆I = 5µA

70

105

240

µA/V

Voltage Gain

1500

V/V

OSCILLATOR

FREQ = GND

540

640

740

Frequency

1100

1320

1600

kHZ

FREQ = GND

79

85

92

Maximum Duty Cycle

85

%

N-CHANNEL SWITCH

Current Limit

1.2

1.6

2.3

A

On-Resistance

0.23

0.50

Ω

Leakage Current

0.01

20.00

µA

SOFT-START

Reset Switch Resistance

300

Ω

Charge Current

1.5

4.0

7.0

µA

CONTROL INPUTS

Input Low Voltage

V

Input High Voltage

SHDN

V

Hysteresis

SHDN

, FREQ

V

FREQ Pull-Down Current

1.8

5.0

9.0

µA

SHDN

Input Current

0.001

1.000

µA