WT78LXX datasheet(7/10 Pages) WEITRON

Part #	WT78LXX

Description	Positive Voltage Regulator

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Manufacturer	WEITRON [Weitron Technology]

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WEITRON

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WT78LXX

7/10

23-Mar-07

Parameter

Symbol

Min

Typ

Max

Unit

V

Output Voltage

Vin=27V, IO=40mA, Tj=25°C

21V ≤ Vin ≤ 33V, 1mA ≤ IO ≤ 40mA

21V≤ Vin ≤Vmax, 1mA≤ IO ≤70mA (Note2)

Line Regulation

21V ≤ Vin ≤ 33V, IO=40mA, Tj=25°C

22V ≤ Vin ≤ 33V, IO=40mA, Tj=25°C

WT78L18 (Refer to the test circuits, Tj=0~125°C, IO=40mA, Vin=27V, Cin=0.33µF, CO=0.1µF unless otherwise speciﬁed)

18.0

-

17.46

17.10

18.54

18.90

145

135

-

300

250

mV

Load Regulation

Vin = 27V, 1mA ≤ IO ≤ 100mA, Tj=25°C

Vin = 27V, 1mA ≤ IO ≤ 40mA, Tj=25°C

Quiescent Current

Vin = 27V, IO =0mA, Tj=25°C

30

15

-

170

85

mV

VO

2.0

-

6.0

mA

IQ

Quiescent Current Change

Vin = 27V, 1mA ≤ IO ≤ 40mA

21V ≤ Vin ≤ 33V, IO=40mA

-

0.1

1.5

mA

IQ

Output Noise Voltage

10Hz ≤ f ≤ 100KHz

150

-

µV

Vn

Dropout Voltage

IO = 100mA, Tj=25°C

1.7

-

V

VD

Temperature Coeﬃcient of Output Voltage

IO = 5mA, 0°C ≤ Tj ≤ 125°C

-1.8

-

mV/°C

VO / Tj

Temperature Coeﬃcient of Output Voltage

IO = 5mA, 0°C ≤ Tj ≤ 125°C

-2.0

-

mV/°C

VO / Tj

Ripple Rejection

23V ≤ Vin ≤ 33V, f=120Hz, Tj=25°C

48

34

-

dB

RR

A-Rank(3%)

B-Rank(5%)

Parameter

Symbol

Min

Typ

Max

Unit

V

Output Voltage

Vin=33V, IO=40mA, Tj=25°C

27V ≤ Vin ≤ 38V, 1mA ≤ IO ≤ 40mA

27V≤ Vin ≤Vmax, 1mA≤ IO ≤70mA (Note2)

Line Regulation

27V ≤ Vin ≤ 38V, IO=40mA, Tj=25°C

28V ≤ Vin ≤ 38V, IO=40mA, Tj=25°C

24.0

-

23.28

22.80

24.72

25.20

160

150

-

300

250

mV

Load Regulation

Vin = 33V, 1mA ≤ IO ≤ 100mA, Tj=25°C

Vin = 33V, 1mA ≤ IO ≤ 40mA, Tj=25°C

Quiescent Current

Vin = 33V, IO =0mA, Tj=25°C

40

20

-

200

100

mV

VO

2.2

-

6.0

mA

IQ

Quiescent Current Change

Vin = 33V, 1mA ≤ IO ≤ 40mA

27V ≤ Vin ≤ 38V, IO=40mA

-

0.1

1.5

mA

IQ

Output Noise Voltage

10Hz ≤ f ≤ 100KHz

200

-

µV

Vn

Dropout Voltage

IO = 100mA, Tj=25°C

1.7

-

V

VD

Ripple Rejection

27V ≤ Vin ≤ 38V, f=120Hz, Tj=25°C

45

34

-

dB

RR

A-Rank(3%)

B-Rank(5%)

WT78L24 (Refer to the test circuits, Tj=0~125°C, IO=40mA, Vin=33V, Cin=0.33µF, CO=0.1µF unless otherwise speciﬁed)

Note1: The Maximum steady state usable output current is dependent on input voltage, heat sinking, lead length of the package and

copper of PCB .The data above represent pulse test conditions with junction temperatures specified at the initiation of test.

Note2: Power dissipation<0.75W

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