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DATA SHEET www.onsemi.com
Negative Voltage Regulators
1.0 A
TO−220 T SUFFIX CASE 221AB
MC7900 Series
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
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
2.0 k
25 2.4 k 14.7 k
2.0 k
8.0 k
Gnd
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.
12 k 1.0 k
4.0 k
3.6 k
1.0 k
4.0 k R1
XX, These two digits of the type number
1.2 k
1.6 k
indicate nominal voltage.
** Cin is required if regulator is located an
R2
appreciable distance from power supply filter.
** CO improve stability and transient response.
10 k
VO
20 pF
10 pF 10 k
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet.
2.0 k
20 k 20 k
1.1 k
This device contains 26 active transistors.
240 750
DEVICE MARKING INFORMATION
0.3 See general marking information in the device marking section on page 12 of this data sheet.
VI
Figure 1. Representative Schematic Diagram
© Semiconductor Components Industries, LLC, 2013
1
October, 2021 − Rev. 21
Publication Order Number: MC7900/D
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 those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. *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
−4.8 −5.0 −5.2
Vdc
Regline
mV
−
7.0
50
−
2.0
25
−
35
100
−
8.0
50
Regload −
mV
11
100
−
4.0
50
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
IIB
−
4.3
8.0
mA
DIIB
mA
−
−
1.3
−
−
0.5
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
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 CH.