ZR78L12N8 datasheet(2/18 Pages) ZETEX

Part #	ZR78L12N8

Description	2.85 TO 12 VOLT FIXED POSITIVE LOCAL VOLTAGE REGULATOR

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Manufacturer	ZETEX [Zetex Semiconductors]

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ZR78L

SERIES

ZR78L028 TEST CONDITIONS (Unless otherwise stated):Tj=25°C, IO=100mA, Vin=6.85V

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNITS

V

O

Output Voltage

2.78

2.85

2.92

V

IO=1 to 200mA τ 2.736

2.964

V

Vin=4.85 to 20V

IO=1 to 100mA τ

2.736

2.964

V

∆V

O

Line Regulation

V

in=4.85 to 20V

10

40

mV

∆V

O

Load Regulation

I

O=1 to 200mA

IO=1 to 100mA

5

2

25

mV

l

q

Quiescent Current

τ

350

600

µA

∆l

q

Quiescent Current Change IO=1 to 200mA

Vin=4.85 to 20V

100

µA

V

n

Output Noise Voltage

f=10Hz to 10kHz

75

µV rms

∆V

in /∆VO

Ripple Rejection

Vin=5.85 to 18V

f=120Hz

48

62

dB

V

in

Input Voltage Required To

Maintain Regulation

4.85

4.55

V

∆V

O /∆T

Average Temperature

Coefficient of VO

IO=5.0mA τ

0.1

mV/°C

τ=Tj=-55 to 125°C

ELECTRICAL CHARACTERISTICS:

Notes:

1. The maximum operating input voltage and

output current of the device will be governed by

the maximum power dissipation of the selected

package. Maximum package power dissipation is

specified at 25 °C and must be linearly derated to

zero at Tamb=125°C.

2. The following data represents pulse test

conditions with junction temperatures as

indicated at the initiation of the test. Continuous

operation of the devices with the stated conditions

might exceed the power dissipation limits of the

chosen package.

3. Maximum power dissipation, for the SOT223

and SO8 packages, is calculated assuming that the

device is mounted on a PCB measuring 2 inches

square.

4. The shut down feature of the device operates if

its temperature exceeds its design limit as might

occur during external faults, short circuits etc. If the

regulator is supplied from an inductive source

then a large voltage transient, on the regulator

input, can result should the shut down circuit

operate. It is advised that a capacitor (1

µF or

greater) should be applied across the regulator

input to ensure that the maximum voltage rating

of the device is not exceeded under shutdown

conditions.

ABSOLUTE MAXIMUM RATING

Input voltage

20V

Output Current(Io) 200mA

Operating Temperature

-55 to 125°C

Storage Temperature

-65 to 150°C

Power Dissipation (Tamb=25°C)

SOT223

2W(Note 3)

TO92

600mW

S08

780mW(Note 3)

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