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Fairchild Semiconductor Electronic Components Datasheet

MC7912ACT Datasheet

3-Terminal 1A Negative Voltage Regulator

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www.fairchildsemi.com
MC79XX/MC79XXA/LM79XX
3-Terminal 1A Negative Voltage Regulator
Features
• Output Current in Excess of 1A
• Output Voltages of -5, -6, -8 , -9, -10, -12, -15, -18 and -
24V
• Internal Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Compensation
Description
The MC79XX / MC79XXA/ LM79XX series of three
terminal negative regulators are available in TO-220
package and with several fixed output voltages, making
them useful in a wide range of applications. Each type
employs internal current limiting, thermal shut down and
safe operating area protection, making it essentially
indestructible.
TO-220
Vin
1
1. GND 2. Input 3. Output
Internal Block Digram
GND
VOLTAGE
REFERENCE
I1
+
-
I2
R1
R2
OOuutptut
Q1
PROTECTION
CIRCUITRY
Q2
Rsc
In
Input
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.1


Fairchild Semiconductor Electronic Components Datasheet

MC7912ACT Datasheet

3-Terminal 1A Negative Voltage Regulator

No Preview Available !

MC79XX/MC79XXA/LM79XX
Absolute Maximum Ratings
Parameter
Input Voltage
Thermal Resistance Junction-Case (Note1)
Thermal Resistance Junction-Air (Note1, 2)
Operating Temperature Range
Storage Temperature Range
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
Symbol
VI
RθJC
RθJA
TOPR
TSTG
Value
-35
5
65
0 ~ +125
-65 ~ +150
Unit
V
°C/W
°C
°C
Electrical Characteristics (MC7905/LM7905)
(VI = -10V, IO = 500mA, 0°C TJ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.)
Parameter
Output Voltage
Line Regulation (Note3)
Load Regulation (Note3)
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Short Circuit Current
Peak Current
Symbol
VO
VO
VO
IQ
IQ
Vo/T
VN
RR
VD
ISC
IPK
Conditions
TJ = +25°C
IO = 5mA to 1A, PO 15W
VI = -7V to -20V
TJ = +25°C
VI = -7V to -25V
VI = -8V to -12V
TJ = +25°C
IO = 5mA to 1.5A
TJ =+25°C
IO = 250mA to 750mA
TJ =+25°C
IO = 5mA to 1A
VI = -8V to -25V
IO = 5mA
f = 10Hz to 100kHz
TA =+25°C
f = 120Hz
VI = 10V
TJ = +25°C
IO = 1A
TJ =+25°C, VI = -35V
TJ =+25°C
Min. Typ.
-4.8 -5.0
-4.75 -5.0
- 35
-8
- 10
-3
-3
- 0.05
- 0.1
- - 0.4
- 40
54 60
-2
- 300
- 2.2
Max.
-5.2
-5.25
100
50
100
50
6
0.5
0.8
-
-
-
-
-
-
Unit
V
mV
mV
mA
mA
mV/°C
µV
dB
V
mA
A
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.
2


Part Number MC7912ACT
Description 3-Terminal 1A Negative Voltage Regulator
Maker Fairchild
Total Page 18 Pages
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