P1888

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

3 of 4

www.unisonic.com.tw

QW-R103-111.a



ABSOLUTE MAXIMUM RATING

PARAMETER

SYMBOL

RATINGS

UNIT

VCC Pin Voltage

VCC

VSS-0.3~VSS+25

V

Feedback Pin Voltage

VFB

VSS-0.3~VCC

V

EN Pin Voltage

VEN

VSS-0.3~VIN+0.3

V

Switch Pin Voltage

VOUTPUT

VSS-0.3~VIN+0.3

V

Power Dissipation

PD

Internally limited

mW

Operating Ambient Temperature

Ta

-20~+85

°C

Operating Temperature

TOPR

-20~+125

°C

Storage Temperature

TSTG

-40~+150

°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.



THERMAL DATA

PARAMETER

SYMBOL

RATINGS

UNIT

Junction to Ambient

θJA

134

°C/W

Junction to Case

θJC

22

°C/W



ELECTRICAL CHARACTERISTICS (Ta=25°C, VIN=12V, unless otherwise specified)

PARAMETER

SYMBOL

CONDITIONS

MIN.

TYP. MAX. UNIT

Input Voltage

VIN

23

V

Feedback Voltage

VFB

IOUT=0.1A

1.18

1.23

1.28

V

Feedback Bias Current

IFB(BIAS)

IOUT=0.1A

0.1

µA

Switch Current

ISW

3.1

A

Standby Current

ISTN-BY

VEN=0V

10

µA

Line Regulation

OUT

OUT

V

V

∆

VIN=5V~23V, IOUT=0.2A

1

%

Load Regulation

OUT

OUT

V

V

∆

IOUT=0.1~3A

0.2

%

Oscillation Frequency

fOSC

Measure waveform at SW pin

240

300

360

KHz

Frequency of Current Limit or

Short Circuit Protect

fOSC1

Measure waveform at SW pin

10

KHz

VSH

Evaluate oscillation at SW pin

0.79

V

EN Pin Input Voltage

VSL

Evaluate oscillation stop at SW pin

0.72

V

ISH

20

µA

EN Pin Input Leakage Current

ISL

-10

µA

Soft-Start Time

TSS

0.3

2

5

ms

VIN=5V, VFB=0V

110

150

mΩ

Internal MOSFET RDS(ON)

RDS(ON)

VIN=12V, VFB=0V

70

100

mΩ

Efficiency

η

VIN=12V, VOUT=5V, IOUT=3A

88

%