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UC3552L

PWM DC-DC CONVERTER WITH INTERNAL SWITCH AND SOFT-START

Unisonic Technologies 

UC3552

CMOS IC

„ ABSOLUTE MAXIMUM RATINGS

PARAMETER

SYMBOL

RATINGS

UNIT

SW to GND

-0.3 ~ +14

V

IN, SHDN , VDD , FREQ to GND

-0.3 ~ +6

V

SS, EO to GND

-1.3V ~ (VDD+0.3V)

V

RMS SW Pin Current

ISW

1.2

A

Continuous Power Dissipation (TC = 70℃) SOP-8

MSOP-8

PD

350

mW

300

mW

Junction Temperature

TJ

+125

℃

Operating Temperature

TOPR

-20 ~ +85

℃

Storage Temperature

TSTG

-45 ~ +125

℃

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.

„ ELECTRICAL CHARACTERISTICS

TC = +25 ℃, VDD =SHDN = 3V, FREQ = GND, unless otherwise specified.)

PARAMETER

SYMBOL

TEST CONDITIONS

Input Supply Voltage

VDD

VDD Under Voltage Lockout

UVLO

When VDD is rising, typical hysteresis

is 40mV; SW remains off below this

level

Quiescent Current

IDD

VDD = 1.3V, not switching

VDD = 1.0V, switching

Shutdown Current

ISC

SHDN = GND

ERROR AMPLIFIER

Feedback Voltage

VIN Level to produce VEO = 1.24V

VDD Input Bias Current

II(BIAS) VIN= 1.24V

Feedback-Voltage Line

Regulation

Level to produce VEO = 1.24V,

2.6V < VDD < 5.5V

Transconductance

gm

∆I = 5µA

Voltage Gain

GV

OSCILLATOR

Frequency

FREQ = GND

fOSC

FREQ = VDD

Maximum Duty Cycle

tDUTY

FREQ = GND

FREQ = VDD

N-CHANNEL SWITCH

Current Limit

ILIMIT VDD = 1V, Duty Cycle = 65%

On-Resistance

RON ISW = 1.2A

Leakage Current

SOFT-START

ILEAK VSW = 12V

Reset Switch Resistance

Charge Current

VSS = 1.2V

CONTROL INPUTS

Input Low Voltage

VIL

SHDN , FREQ; VDD = 2.6V ~ 5.5V

Input High Voltage

VIH SHDN , FREQ; VDD = 2.6V ~ 5.5V

Hysteresis

SHDN , FREQ

FREQ Pull-Down Current

IFREQ

SHDN Input Current

ISHDN

MIN TYP MAX

2.6

5.5

2.25 2.38 2.52

0.21 0.35

1.2 5.0

0.1 10.0

1.22 1.240 1.258

0

40

0.05 0.15

70 105 240

1500

540

1100

79

640

1320

85

85

740

1600

92

1.2 1.6 2.3

0.23 0.50

0.01 20.00

300

1.5 4.0 7.0

0.3VDD

0.7VDD

0.1VDD

1.8 5.0 9.0

0.001 1.000

UNIT

V

V

mA

µA

V

nA

%/V

µA/V

V/V

kHZ

%

A

Ω

µA

Ω

µA

V

V

V

µA

µA

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

4 of 7

QW-R502-134.A

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