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MC7912BT

Part # MC7912BT
Description IC REG LDO -12V 1A TO220AB
Category RECTIFIER
Availability In Stock
Qty 6
Qty Price
1 + $0.76534
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Motorola Corp
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

Semiconductor Components Industries, LLC, 2004
March, 2004 − Rev. 12
1 Publication Order Number:
MC7900/D
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
Figure 1. Representative Schematic Diagram
Gnd
V
O
V
I
2.4 k
25
3.6 k
1.2 k
1.1 k
2.0 k
12 k
1.0 k
4.0 k
2.0 k
14.7 k
2.0 k
8.0 k
1.0 k
1.6 k
4.0 k
0.3
10 k
10 k
20 k 20 k
20 pF
10 pF
240
750
R
1
R
2
This device contains 26 active transistors.
http://onsemi.com
TO−220
T SUFFIX
CASE 221A
Heatsink surface
connected to Pin 2.
Pin 1. Ground
2. Input
3. Output
D
2
PAK
D2T SUFFIX
CASE 936
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
1
2
3
1
2
3
STANDARD APPLICATION
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.
These two digits of the type number
indicate nominal voltage.
C
in
is required if regulator is located an
appreciable distance from power supply filter.
C
O
improve stability and transient response.
MC79XX
Input
C
in
*
0.33 F
C
O
**
1.0 F
Output
XX,
**
**
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 12 of this data sheet.
DEVICE MARKING INFORMATION
MC7900 Series
http://onsemi.com
2
MAXIMUM RATINGS (T
A
= +25°C, unless otherwise noted.)
Rating
Symbol Value Unit
Input Voltage (−5.0 V ≥ V
O
≥ −18 V)
Input Voltage (24 V)
V
I
−35
−40
Vdc
Power Dissipation
Case 221A
T
A
= +25°C P
D
Internally Limited W
Thermal Resistance, Junction−to−Ambient
JA
65 °C/W
Thermal Resistance, Junction−to−Case
JC
5.0 °C/W
Case 936 (D
2
PAK)
T
A
= +25°C P
D
Internally Limited W
Thermal Resistance, Junction−to−Ambient
JA
70 °C/W
Thermal Resistance, Junction−to−Case
JC
5.0 °C/W
Storage Junction Temperature Range T
stg
−65 to +150 °C
Junction Temperature T
J
+150 °C
THERMAL CHARACTERISTICS
Characteristics Symbol Max Unit
Thermal Resistance, Junction−to−Ambient R
JA
65 °C/W
Thermal Resistance, Junction−to−Case R
JC
5.0 °C/W
MC7905B, MC7905C
ELECTRICAL CHARACTERISTICS
(V
I
= −10 V, I
O
= 500 mA, Tlow* < T
J
< +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (T
J
= +25°C) V
O
−4.8 −5.0 −5.2 Vdc
Line Regulation (Note 1)
(T
J
= +25°C, I
O
= 100 mA)
−7.0 Vdc ≥ V
I
≥ −25 Vdc
−8.0 Vdc ≥ V
I
≥ −12 Vdc
(T
J
= +25°C, I
O
= 500 mA)
−7.0 Vdc ≥ V
I
≥ −25 Vdc
−8.0 Vdc ≥ V
I
≥ −12 Vdc
Reg
line
−
−
−
−
7.0
2.0
35
8.0
50
25
100
50
mV
Load Regulation, T
J
= +25°C (Note 1)
5.0 mA ≤ I
O
≤ 1.5 A
250 mA ≤ I
O
≤ 750 mA
Reg
load
−
−
11
4.0
100
50
mV
Output Voltage
−7.0 Vdc ≥ V
I
≥ −20 Vdc, 5.0 mA ≤ I
O
≤ 1.0 A, P ≤ 15 W
V
O
−4.75 − −5.25
Vdc
Input Bias Current (T
J
= +25°C) I
IB
− 4.3 8.0 mA
Input Bias Current Change
−7.0 Vdc ≥ V
I
≥ −25 Vdc
5.0 mA ≤ I
O
≤ 1.5 A
I
IB
−
−
−
−
1.3
0.5
mA
Output Noise Voltage (T
A
= +25°C, 10 Hz ≤ f ≤ 100 kHz) V
n
− 40 − V
Ripple Rejection (I
O
= 20 mA, f = 120 Hz) RR − 70 − dB
Dropout Voltage
I
O
= 1.0 A, T
J
= +25°C
V
I
−V
O
− 2.0 −
Vdc
Average Temperature Coefficient of Output Voltage
I
O
= 5.0 mA, Tlow* ≤ T
J
≤ +125°C
V
O
/T
− −1.0 −
mV/°C
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
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.
MC7900 Series
http://onsemi.com
3
MC7905AC
ELECTRICAL CHARACTERISTICS
(V
I
= −10 V, I
O
= 500 mA, 0°C < T
J
< +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (T
J
= +25°C) V
O
−4.9 −5.0 −5.1 Vdc
Line Regulation (Note 2)
−8.0 Vdc ≥ V
I
≥ −12 Vdc; I
O
= 1.0 A, T
J
= +25°C
−8.0 Vdc ≥ V
I
≥ −12 Vdc; I
O
= 1.0 A
−7.5 Vdc ≥ V
I
≥ −25 Vdc; I
O
= 500 mA
−7.0 Vdc ≥ V
I
≥ −20 Vdc; I
O
= 1.0 A, T
J
= +25°C
Reg
line
−
−
−
−
2.0
7.0
7.0
6.0
25
50
50
50
mV
Load Regulation (Note 2)
5.0 mA ≤ I
O
≤ 1.5 A, T
J
= +25°C
250 mA ≤ I
O
≤ 750 mA
5.0 mA ≤ I
O
≤ 1.0 A
Reg
load
−
−
−
11
4.0
9.0
100
50
100
mV
Output Voltage
−7.5 Vdc ≥ V
I
≥ −20 Vdc, 5.0 mA ≤ I
O
≤ 1.0 A, P ≤ 15 W
V
O
−4.80 − −5.20
Vdc
Input Bias Current I
IB
− 4.4 8.0 mA
Input Bias Current Change
−7.5 Vdc ≥ V
I
≥ −25 Vdc
5.0 mA ≤ I
O
≤ 1.0 A
5.0 mA ≤ I
O
≤ 1.5 A, T
J
= +25°C
I
IB
−
−
−
−
−
−
1.3
0.5
0.5
mA
Output Noise Voltage (T
A
= +25°C, 10 Hz ≤ f ≤ 100 kHz) V
n
− 40 − V
Ripple Rejection (I
O
= mA, f = 120 Hz) RR − 70 − dB
Dropout Voltage (I
O
= 1.0 A. T
J
= +25°C) V
I
−V
O
− 2.0 − Vdc
Average Temperature Coefficient of Output Voltage
I
O
= 5.0 A, 0°C ≤ T
J
≤ +125°C
V
O
/T
− −1.0 −
mV/°C
MC7905.2C
ELECTRICAL CHARACTERISTICS
(V
I
= −10 V, I
O
= 500 mA, 0°C < T
J
< +125°C, unless otherwise noted.)
Characteristics
Symbol Min Typ Max Unit
Output Voltage (T
J
= +25°C) V
O
−5.0 −5.2 −5.4 Vdc
Line Regulation (Note 2)
(T
J
= +25°C, I
O
= 100 mA)
−7.2 Vdc ≥ V
I
≥ −25 Vdc
−8.0 Vdc ≥ V
I
≥ −12 Vdc
(T
J
= +25°C, I
O
= 500 mA)
−7.2 Vdc ≥ V
I
≥ −25 Vdc
−8.0 Vdc ≥ V
I
≥ −12 Vdc
Reg
line
−
−
−
−
8.0
2.2
37
8.5
52
27
105
52
mV
Load Regulation, T
J
= +25°C (Note 2)
5.0 mA ≤ I
O
≤ 1.5 A
250 mA ≤ I
O
≤ 750 mA
Reg
load
−
−
12
4.5
105
52
mV
Output Voltage
−7.2 Vdc ≥ V
I
≥ −20 Vdc, 5.0 mA ≤ I
O
≤ 1.0 A, P ≤ 15 W
V
O
−4.95 − −5.45
Vdc
Input Bias Current (T
J
= +25°C) I
IB
− 4.3 8.0 mA
Input Bias Current Change
−7.2 Vdc ≥ V
I
≥ −25 Vdc
5.0 mA ≤ I
O
≤ 1.5 A
I
IB
−
−
−
−
1.3
0.5
mA
Output Noise Voltage (T
A
= +25°C, 10 Hz ≤ f ≤ 100 kHz) V
n
− 42 − V
Ripple Rejection (I
O
= 20 mA, f = 120 Hz) RR − 68 − dB
Dropout Voltage (I
O
= 1.0 A, T
J
= +25°C) V
I
−V
O
− 2.0 − Vdc
Average Temperature Coefficient of Output Voltage
I
O
= 5.0 mA, 0°C ≤ T
J
≤ +125°C
V
O
/T
− −1.0 −
mV/°C
2. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects must be taken into account
separately. Pulse testing with low duty cycle is used.
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