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MC7900 Series
1.0 A Negative Voltage
Regulators
The MC7900 series of fixed output negative voltage regulators are
intended as complements to the popular MC7800 series devices.
These negative regulators are available in the same seven−voltage
options as the MC7800 devices. In addition, one extra voltage option
commonly employed in MECL systems is also available in the
negative MC7900 series.
Available in fixed output voltage options from − 5.0 V to − 24 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 1.0 A.
No External Components Required
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe−Area Compensation
Available in 2% Voltage Tolerance (See Ordering Information)
Pb−Free Package May be Available. The G−Suffix Denotes a
Pb−Free Lead Finish
2.0 k 8.0 k
Gnd
3.6 k 1.0 k 4.0 k R1
1.2 k 1.6 k
R2
10 k
20 pF
10 pF 10 k
2.0 k 20 k 20 k
1.1 k
240
750
This device contains 26 active transistors.
VO
0.3
VI
Figure 1. Representative Schematic Diagram
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TO−220
T SUFFIX
CASE 221AB
Heatsink surface
connected to Pin 2.
1
2
3
Pin 1. Ground
2. Input
3. Output
D2PAK
D2T SUFFIX
CASE 936
12
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
STANDARD APPLICATION
Input
Cin*
0.33 mF
MC79XX
Output
CO**
1.0 mF
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 2.0 V above 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.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 14 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 14
1
Publication Order Number:
MC7900/D

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MC7900 Series
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating
Symbol
Value
Unit
Input Voltage (−5.0 V VO −18 V)
Input Voltage (24 V)
VI −35 Vdc
− 40
Power Dissipation
Case 221A
TA = +25°C
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 936 (D2PAK)
TA = +25°C
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
PD Internally Limited W
qJA 65 °C/W
qJC 5.0 °C/W
PD Internally Limited W
qJA 70 °C/W
qJC 5.0 °C/W
Storage Junction Temperature Range
Tstg − 65 to +150 °C
Junction Temperature
TJ +150 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
*This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL_STD_883, Method 3015
Machine Model Method 200 V
MC7905B, MC7905C
ELECTRICAL CHARACTERISTICS (VI = −10 V, IO = 500 mA, Tlow* < TJ < +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (TJ = +25°C)
Line Regulation (Note 1)
(TJ = +25°C, IO = 100 mA)
−7.0 Vdc VI − 25 Vdc
−8.0 Vdc VI −12 Vdc
(TJ = +25°C, IO = 500 mA)
−7.0 Vdc VI − 25 Vdc
−8.0 Vdc VI −12 Vdc
Load Regulation, TJ = +25°C (Note 1)
5.0 mA IO 1.5 A
250 mA IO 750 mA
VO
Regline
Regload
−4.8 −5.0 −5.2
− 7.0 50
− 2.0 25
− 35 100
− 8.0 50
− 11 100
− 4.0 50
Vdc
mV
mV
Output Voltage
−7.0 Vdc VI − 20 Vdc, 5.0 mA IO 1.0 A, P 15 W
VO Vdc
−4.75 − −5.25
Input Bias Current (TJ = +25°C)
Input Bias Current Change
−7.0 Vdc VI − 25 Vdc
5.0 mA IO 1.5 A
Output Noise Voltage (TA = +25°C, 10 Hz f 100 kHz)
Ripple Rejection (IO = 20 mA, f = 120 Hz)
Dropout Voltage
IO = 1.0 A, TJ = +25°C
IIB − 4.3 8.0 mA
DIIB mA
− − 1.3
− − 0.5
Vn − 40 − mV
RR − 70 − dB
VI−VO
Vdc
− 1.3 −
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, Tlow* TJ +125°C
DVO/DT
mV/°C
− −1.0 −
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 cycle is used.
*Tlow = −40°C for MC7905B and Tlow = 0°C for MC7905C.
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MC7900 Series
MC7905AC
ELECTRICAL CHARACTERISTICS (VI = −10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (TJ = +25°C)
Line Regulation (Note 2)
−8.0 Vdc VI −12 Vdc; IO = 1.0 A, TJ = +25°C
−8.0 Vdc VI −12 Vdc; IO = 1.0 A
−7.5 Vdc VI − 25 Vdc; IO = 500 mA
−7.0 Vdc VI − 20 Vdc; IO = 1.0 A, TJ = +25°C
VO
Regline
− 4.9
− 5.0
2.0
7.0
7.0
6.0
− 5.1
25
50
50
50
Vdc
mV
Load Regulation (Note 2)
5.0 mA IO 1.5 A, TJ = +25°C
250 mA IO 750 mA
5.0 mA IO 1.0 A
Output Voltage
−7.5 Vdc VI − 20 Vdc, 5.0 mA IO 1.0 A, P 15 W
Regload
mV
11 100
4.0 50
9.0 100
VO Vdc
−4.80 − −5.20
Input Bias Current
Input Bias Current Change
−7.5 Vdc VI − 25 Vdc
5.0 mA IO 1.0 A
5.0 mA IO 1.5 A, TJ = +25°C
Output Noise Voltage (TA = +25°C, 10 Hz f 100 kHz)
Ripple Rejection (IO = mA, f = 120 Hz)
Dropout Voltage (IO = 1.0 A. TJ = +25°C)
Average Temperature Coefficient of Output Voltage
IO = 5.0 A, 0°C TJ +125°C
IIB − 4.4 8.0 mA
DIIB mA
− − 1.3
− − 0.5
− − 0.5
Vn − 40 − mV
RR − 70 − dB
VI−VO − 1.3 − Vdc
DVO/DT
mV/°C
− −1.0 −
MC7905.2C
ELECTRICAL CHARACTERISTICS (VI = −10 V, IO = 500 mA, 0°C < TJ < +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (TJ = +25°C)
Line Regulation (Note 2)
(TJ = +25°C, IO = 100 mA)
−7.2 Vdc VI − 25 Vdc
−8.0 Vdc VI −12 Vdc
(TJ = +25°C, IO = 500 mA)
−7.2 Vdc VI − 25 Vdc
−8.0 Vdc VI −12 Vdc
Load Regulation, TJ = +25°C (Note 2)
5.0 mA IO 1.5 A
250 mA IO 750 mA
VO
Regline
Regload
−5.0 −5.2 −5.4
− 8.0 52
− 2.2 27
− 37 105
− 8.5 52
− 12 105
− 4.5 52
Vdc
mV
mV
Output Voltage
−7.2 Vdc VI − 20 Vdc, 5.0 mA IO 1.0 A, P 15 W
VO Vdc
−4.95 − −5.45
Input Bias Current (TJ = +25°C)
IIB − 4.3 8.0 mA
Input Bias Current Change
−7.2 Vdc VI − 25 Vdc
5.0 mA IO 1.5 A
DIIB mA
− − 1.3
− − 0.5
Output Noise Voltage (TA = +25°C, 10 Hz f 100 kHz)
Vn − 42 − mV
Ripple Rejection (IO = 20 mA, f = 120 Hz)
RR − 68 − dB
Dropout Voltage (IO = 1.0 A, TJ = +25°C)
VI−VO − 1.3 − Vdc
Average Temperature Coefficient of Output Voltage
IO = 5.0 mA, 0°C TJ +125°C
DVO/DT
mV/°C
− −1.0 −
2. 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 cycle is used.
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