UD32121

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R115-036.E



ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified)

PARAMETER

SYMBOL

RATINGS

UNIT

VCC Pin Voltage

VIN

33

V

SW Pin Voltage

VSW

33

V

BOOST Trap Voltage

VBST

VSW +6V

V

All Other Pins Voltage

-0.3V ~ + 6V

V

Power Dissipation

PD

380

mW

Junction Temperature Range

TJ

+150

°C

Storage Temperature Range

TSTG

-65 ~ +150

°C

Notes: 1. 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.



RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

RATINGS

UNIT

Input Supply Voltage

VIN

4.5 ~ 32

V

Output Voltage

VOUT

0.81 ~ 15

V

Ambient Temperature

TA

-40 ~ +125

°C

input current into the EN pin

300

μA

Note: The device is not guaranteed to function outside of its operating conditions.



THERMAL CHARACTERISTICS

PARAMETER

SYMBOL

RATINGS

UNIT

Junction To Ambient

θJA

260

°C/W



ELECTRICAL CHARACTERISTICS

(VIN = 12V, TA=25°C, unless otherwise specified)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Quiescent Current

IQ

VEN=2V, VFB=1V

0.8

mA

Shutdown Current

ISHDN

VEN=0V.

1

3

µA

Switch-On Resistance (Note 6)

RDS-ON

0.35

Ω

Switch Leakage Current

ISWLKG

VEN=0V, VSW=0V

10

uA

Current Limit (Note 6)

ILIMIT

1.8

A

Oscillation frequency

FSW

1.4

MHz

Fold-Back Frequency

FSB

VFB=0V

290

KHz

Max Duty Cycle

DMAX

VFB=0.6V

87

%

Minimum On Time (Note 6)

TON_MIN

100

nS

Feedback Voltage

VFB

4.5V≦VIN≦32V

0.790

0.810

0.830

V

EN Input High Voltage

VEN_H

VEN Rising

1.2

V

EN Input Low Voltage

0.4

V

EN input current

VEN=2V

2.1

uA

VEN=0V

0.1

VIN UVLO Threshold-Rising

VUVLO(Vth)

VIN Rising

2.8

V

VIN UVLO Threshold Hysteresis

150

mV

Thermal Shutdown (Note 6)

TSD

150

°C

Thermal Hysteresis (Note 6)

25

°C

Note: Guaranteed by design.