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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
R1 VOLTAGE REFERENCE
R2
Output Out
+
Q1
Q2 PROTECTION CIRCUITRY Rsc
I1
I2
Input
In
Rev. 1.0.1
©2002 Fairchild Semiconductor Corporation
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 Symbol TJ = +25°C VO IO = 5mA to 1A, PO ≤ 15W VI = -7V to -20V TJ = +25°C 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 VI = -7V to -25V VI = -8V to -12V Conditions Min. -4.8 -4.75 54 Typ. -5.0 -5.0 35 8 10 3 3 0.05 0.1 - 0.4 40 60 2 300 2.2 Max. -5.2 -5.25 100 50 100 mV 50 6 0.5 0.8 mA mA mV/°C µV dB V mA A V Unit
Line Regulation (Note3)
∆VO
mV
Load Regulation (Note3)
∆VO
Quiescent Current Quiescent Current Change Temperature Coefficient of VD Output Noise Voltage Ripple Rejection Dropout Voltage Short Circuit Current Peak Current
IQ ∆IQ ∆Vo/∆T VN RR VD ISC IPK
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
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7906) (Continued)
(VI = -11V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.) Parameter Output Voltage Symbol TJ = +25°C VO IO = 5mA to 1A, PO ≤ 15W VI = -9V to -21V TJ = +25°C 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 VI = -8V to -25V VI = -9V to -13V Conditions Min. -5.75 -5.7 54 Typ. -6 -6 10 5 10 3 3 0.05 0.1 -0.5 130 60 2 300 2.2 Max. -6.25 -6.3 120 60 120 mV 60 6 0.5 1.3 mA mA mV/°C µV dB V mA A V Unit
Line Regulation (Note1)
∆VO
mV
Load Regulation (Note1)
∆VO
Quiescent Current Quiescent Current Change Temperature Coefficient of VD Output Noise Voltage Ripple Rejection Dropout Voltage Short Circuit Current Peak Current
IQ ∆IQ ∆Vo/∆T VN RR VD ISC IPK
Note 1. 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.
3
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7908) (Continued)
(VI = -14V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.) Parameter Output Voltage Symbol VO Conditions TJ = +25°C IO = 5mA to 1A, PO ≤ 15W VI = -10V to -23V TJ = +25°C VI = -10.5V to -25V VI = -11V to -17V Min. -7.7 -7.6 54 Typ. -8 -8 10 5 12 4 3 0.05 0.1 -0.6 175 60 2 300 2.2 Max. -8.3 -8.4 160 80 160 mV 80 6 0.5 1 mA mA mV/°C µV dB V mA A V Unit
Line Regulation (Note1)
∆ VO
mV
Load Regulation (Note1)
∆ VO
TJ = +25°C IO = 5mA to 1.5A TJ =+25°C IO = 250mA to 750mA TJ =+25°C IO = 5mA to 1A VI = -10.5V 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
Quiescent Current Quiescent Current Change Temperature Coefficient of VD Output Noise Voltage Ripple Rejection Dropout Voltage Short Circuit Current Peak Current
IQ ∆IQ ∆Vo/∆T VN RR VD ISC IPK
Note 1. 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.
4
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7909) (Continued)
(VI = -15V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.) Parameter Output Voltage Symbol TJ = +25°C VO IO = 5mA to 1A, PO ≤ 15W VI = -1.5V to -23V TJ = +25°C TJ = +25°C IO = 5mA to 1.5A TJ = +25°C IO = 250mA to 750mA TJ = +25°C IO = 5m.