mc7908 Fairchild Semiconductor, mc7908 Datasheet

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mc7908

Manufacturer Part Number
mc7908
Description
Mc79xx/mc79xxa/lm79xx 3-terminal 1a Negative Voltage Regulator
Manufacturer
Fairchild Semiconductor
Datasheet

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Features
• Output Current in Excess of 1A
• Output Voltages of -5, -6, -8 , -9, -10, -12, -15, -18 and -
• Internal Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Compensation
Internal Block Digram
©2002 Fairchild Semiconductor Corporation
MC79XX/MC79XXA/LM79XX
3-Terminal 1A Negative Voltage Regulator
24V
GND
REFERENCE
I1
VOLTAGE
I2
+
-
PROTECTION
CIRCUITRY
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.
1. GND 2. Input 3. Output
TO-220
1
Vin
Q1
Q2
www.fairchildsemi.com
R1
R2
Rsc
Input
Output
Out
In
Rev. 1.0.1

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mc7908 Summary of contents

Page 1

... Output Transistor Safe Operating Area Compensation Internal Block Digram GND VOLTAGE REFERENCE I1 ©2002 Fairchild Semiconductor Corporation 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 ...

Page 2

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 ...

Page 3

Electrical Characteristics (MC7906 -11V 500mA +125 Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise Voltage ...

Page 4

... MC79XX/MC79XXA/LM79XX Electrical Characteristics (MC7908 -14V 500mA Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise Voltage Ripple Rejection Dropout Voltage Short Circuit Current Peak Current Note 1. Load and line regulation are specified at constant junction temperature. Changes in V into account separately ...

Page 5

Electrical Characteristics (MC7909 -15V 500mA +125 Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise Voltage ...

Page 6

Electrical Characteristics (MC7910 -17V 500mA +125 Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise Voltage ...

Page 7

MC79XX/MC79XXA/LM79XX Electrical Characteristics (MC7912 -19V 500mA Parameter Symbol Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise Voltage Ripple ...

Page 8

Electrical Characteristics (MC7915 -23V 500mA +125 Parameter Symbol Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise ...

Page 9

MC79XX/MC79XXA/LM79XX Electrical Characteristics (MC7918 -27V 500mA +125 Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise ...

Page 10

MC79XX/MC79XXA/LM79XX Electrical Characteristics (MC7924 -33V 500mA Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise Voltage Ripple Rejection ...

Page 11

Electrical Characteristics (MC7905A -10V 500mA Parameter Symbol Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of Vo Output Noise Voltage ...

Page 12

MC79XX/MC79XXA/LM79XX Electrical Characteristics (MC7912A -19V 500mA Parameter Symbol Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient Output Noise Voltage Ripple ...

Page 13

Electrical Characteristics (MC7915A -23V 500mA +125 Parameter Symbol Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient ...

Page 14

MC79XX/MC79XXA/LM79XX Typical Perfomance Characteristics 5.1 Vin=10V Io=40mA 5. 4.95 lta ge 4.9 [- Vin=25V Io=100mA V] 4.85 4.8 -40 - Ambient Temperature [ A Figure 1. Output Voltage 5 4.5 ...

Page 15

Typical Applications Notes: (1) To specify an output voltage, substitute voltage value for "XX " (2) Required for stability. For value given, capacitor must be solid tantalum. If aluminium electronics are used, at least ten times value shown should be ...

Page 16

MC79XX/MC79XXA/LM79XX Mechanical Dimensions Package 9.90 0.20 (8.70) ø3.60 0.10 1.27 0.10 2.54TYP [2.54 ] 0.20 10.00 0.20 16 Dimensions in millimeters TO-220 1.52 0.10 0.80 0.10 +0.10 0.50 –0.05 2.54TYP [2.54 ] 0.20 4.50 0.20 +0.10 1.30 –0.05 2.40 0.20 ...

Page 17

... Ordering Information Product Number Output Voltage Tolerance LM7905CT Product Number Output Voltage Tolerance MC7905CT MC7906CT MC7908CT MC7909CT MC7910CT MC7912CT MC7915CT MC7918CT MC7924CT MC7905ACT MC7912ACT MC7915ACT Package Operating Temperature TO-220 ±4% Package Operating Temperature ±4% TO-220 ±2% MC79XX/MC79XXA/LM79XX 0 ~ +125 +125 C 17 ...

Page 18

... MC79XX/MC79XXA/LM79XX DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...

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