MC7924CT datasheet(2/18 Pages) FAIRCHILD

Part #	MC7924CT

Description	3-Terminal 1A Negative Voltage Regulator

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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MC79XX/MC79XXA/LM79XX

2

Absolute Maximum Ratings

Note:

1. Thermal resistance test board

Size: 76.2mm * 114.3mm * 1.6mm(1S0P)

JEDEC standard: JESD51-3, JESD51-7

2. Assume no ambient airflow

Electrical Characteristics (MC7905/LM7905)

(VI = -10V, IO = 500mA, 0

°C ≤TJ ≤ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.)

Note

3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken

into account separately. Pulse testing with low duty is used.

Parameter

Symbol

Value

Unit

Input Voltage

VI

-35

V

Thermal Resistance Junction-Case (Note1)

R

θJC

5

°C/W

Thermal Resistance Junction-Air (Note1, 2)

R

θJA

65

Operating Temperature Range

TOPR

0 ~ +125

°C

Storage Temperature Range

TSTG

-65 ~ +150

°C

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Output Voltage

VO

TJ = +25

°C

-4.8

-5.0

-5.2

V

IO = 5mA to 1A, PO

≤ 15W

VI = -7V to -20V

-4.75

-5.0

-5.25

Line Regulation (Note3)

∆VO

TJ = +25

°C

VI = -7V to -25V

-

35

100

mV

VI = -8V to -12V

-

8

50

Load Regulation (Note3)

∆VO

TJ = +25

°C

IO = 5mA to 1.5A

-

10

100

mV

TJ =+25

°C

IO = 250mA to 750mA

-3

50

Quiescent Current

IQ

TJ =+25

°C-

3

6

mA

Quiescent Current Change

∆IQ

IO = 5mA to 1A

-

0.05

0.5

mA

VI = -8V to -25V

-

0.1

0.8

Temperature Coefficient of VD

∆Vo/∆TIO = 5mA

-

- 0.4

-

mV/

°C

Output Noise Voltage

VN

f = 10Hz to 100kHz

TA =+25

°C

-40

-

µV

Ripple Rejection

RR

f = 120Hz

∆VI = 10V

54

60

-

dB

Dropout Voltage

VD

TJ = +25

°C

IO = 1A

-2

-

V

Short Circuit Current

ISC

TJ =+25

°C, VI = -35V

-

300

-

mA

Peak Current

IPK

TJ =+25

°C-

2.2

-

A

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