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Motorola Electronic Components Datasheet

MC79M08XBT Datasheet

THREE-TERMINAL NEGATIVE FIXED VOLTAGE REGULATORS

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Order this document by MC79M00/D
Three-Terminal Negative
Voltage Regulators
The MC79M00 series of fixed output negative voltage regulators are
intended as complements to the popular MC78M00 series devices.
Available in fixed output voltage options of –5.0, –8.0, –12 and –15 V,
these regulators employ current limiting, thermal shutdown, and safe–area
compensation – making them remarkably rugged under most operating
conditions. With adequate heatsinking they can deliver output currents in
excess of 0.5 A.
No External Components Required
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe–Area Compensation
Also Available in Surface Mount DPAK (DT) Package
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC79M05
MC79M08
–5.0 V
–8.0 V
MC79M12
MC79M15
–12 V
–15 V
ORDERING INFORMATION
Device
Output
Voltage
Tolerance
Operating
Temperature Range
Package
MC79MXXBDT, BDT–1
MC79MXXBT
MC79MXXCDT, CDT–1
MC79MXXCT
4.0%
TJ = – 40° to +125°C
TJ = 0° to +125°C
DPAK
Plastic Power
DPAK
Plastic Power
XX indicates nominal voltage.
Representative Schematic Diagram
Gnd
MC79M00
Series
THREE–TERMINAL
NEGATIVE FIXED
VOLTAGE REGULATORS
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
Pin 1. Ground
2. Input
3. Output
1
2
3
1
3
DT SUFFIX
PLASTIC PACKAGE
CASE 369A
(DPAK)
1
23
DT–1 SUFFIX
PLASTIC PACKAGE
CASE 369
(DPAK)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
STANDARD APPLICATION
4.0 k R1
Input
Cin*
0.33 µF
MC79MXX
Output
CO**
1.0 µF
R2
10 k VO
20 pF
10 pF 10 k
2.0 k
1.1 k
20 k 20 k
240
100
750
This device contains 31 active transistors.
0.3
VI
MOTOROLA ANALOG IC DEVICE DATA
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 1.1 V more negative even during
the high point of the input ripple voltage.
XX, These two digits of the type number indicate
nominal voltage.
* Cin is required if regulator is located an
appreciable distance from power supply filter.
** CO improve stability and transient response.
© Motorola, Inc. 1996
Rev 4
1


Motorola Electronic Components Datasheet

MC79M08XBT Datasheet

THREE-TERMINAL NEGATIVE FIXED VOLTAGE REGULATORS

No Preview Available !

MC79M00
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)
Rating
Symbol
Value
Input Voltage
VI –35
Power Dissipation
Case 221A
TA = 25°C
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Case 369 and 369A (DPAK)
TA = 25°C
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Storage Junction Temperature
Junction Temperature
PD Internally Limited
θJA 65
θJC 5.0
PD Internally Limited
θJA 92
θJC 6.0
Tstg –65 to +150
TJ 150
NOTE: ESD data available upon request.
Unit
Vdc
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
THERMAL CHARACTERISTICS
Characteristic
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Symbol
RθJA
RθJC
Value
65
5.0
Unit
°C/W
°C/W
MC79M05B, C
ELECTRICAL CHARACTERISTICS (VI = –10 V, IO = 350 mA, Tlow to Thigh [Note 2], unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C)
Line Regulation, TJ = 25°C (Note 1)
–7.0 Vdc VI –25 Vdc
–8.0 Vdc VI –18 Vdc
Load Regulation, TJ = 25°C (Note 1)
5.0 mA IO 500 mA
VO –4.8 –5.0 –5.2 Vdc
Regline
mV
7.0 50
2.0 30
Regload
mV
30 100
Output Voltage
–7.0 Vdc VI –25 Vdc, 5.0 mA IO 350 mA
Input Bias Current (TJ = 25°C)
Input Bias Current Change
–8.0 Vdc VI –25 Vdc, IO = 350 mA
5.0 mA IO 350 mA, VI = –10 V
Output Noise Voltage, TA = 25°C, 10 Hz f 100 kHz
Ripple Rejection (f = 120 Hz)
VO Vdc
–4.75 – –5.25
IIB – 4.3 8.0 mA
IIB mA
– – 0.4
– – 0.4
Vn – 40 – µV
RR 54 66 – dB
Dropout Voltage
IO = 500 mA, TJ = 25°C
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C TJ 125°C
VI–VO
Vdc
– 1.1 –
VO/T
mV/°C
– 0.2 –
NOTES: 1. Load and line regulation are specified at constant temperature. Change in VO due to heating effects must be taken into account separately. Pulse
testing with low duty cycle is used.
2. B = Tlow to Thigh, –40°C < TJ < 125°C
C = Tlow to Thigh, 0°C < TJ < 125°C
2 MOTOROLA ANALOG IC DEVICE DATA


Part Number MC79M08XBT
Description THREE-TERMINAL NEGATIVE FIXED VOLTAGE REGULATORS
Maker Motorola
Total Page 8 Pages
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