78TXXAA

LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIESCO.,LTD

7 of 8

www.unisonic.com.tw

QW-R101-044.F



ELECTRICAL CHARACTERISTICS (Cont.)

For 78T18AA (VIN =27V, IOUT =0.5A)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Output Voltage

VOUT

IOUT=5mA~1.0A

17.28 18.0 18.72

V

VIN =21~33V, IOUT=5mA~1.0A

17.1

18.9

V

Load Regulation

VOUT

IOUT=5mA~1.5A

360

mV

IOUT=0.25A~0.75A

180

mV

Line Regulation

VOUT

VIN =21~33V

180

mV

VIN =21~33V, IOUT =1.0A

180

mV

Quiescent Current

IQ

IOUT≤1.0A

8.0

mA

Quiescent Current Change

IQ

VIN =21.5~33V

1.0

mA

IOUT=5mA~1.0A

0.5

mA

Output Noise Voltage

eN

10Hz≤f≤100kHz

110

μV

Ripple Rejection

RR

VIN =22~32V,f=120Hz

50

69

dB

Peak Output Current

IPEAK

1.8

A

Short-Circuit Current

ISC

VIN =35V

250

mA

Dropout Voltage

VD

IOUT=1.5A

2.5

V

For 78T24AA (VIN =33V, IOUT =0.5A)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Output Voltage

VOUT

TJ =25°C, IOUT=5mA ~ 1.0A

23.04 24.0 24.96

V

VIN =27V ~ 38V,

IOUT=5mA ~ 1.0A, ,PD≤15W

22.80

25.20

V

Load Regulation

VOUT

TJ =25°C,IOUT=5mA ~ 1.5A

480

mV

TJ =25C,IOUT=0.25A ~ 0.75A

24

0

mV

Line Regulation

VOUT

VIN =27V ~ 38V, TJ =25°C

240

mV

VIN =27V ~ 38V, TJ =25°C,I

OUT=1.0A

240

mV

Quiescent Current

IQ

TJ =25°C, IOUT≤1.0A

8.0

mA

Quiescent Current Change

IQ

VIN =28V ~ 38V

1.0

mA

IOUT=5mA ~ 1.0A

0.5

mA

Output Noise Voltage

eN

10Hz≤f≤100kHz

170

μV

Ripple Rejection

RR

VIN =28V ~ 38V, f=120Hz,

TJ=25°C

47

66

dB

Peak Output Current

IPEAK

TJ =25°C

1.8

A

Short-Circuit Current

ISC

VIN =35V, TJ =25°C

250

mA

Dropout Voltage

VD

TJ =25°C

2.0

V

Notes: 1. The Maximum steady state usable output current are dependent on input voltage, heat sinking, lead length

of the package and copper pattern of PCB. The data above represents pulse test conditions with junction

temperatures specified at the initiation of test.

2. Power dissipation < 0.5W.