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uA 78S05
Datasheet
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ST MICROELECTRONICS uA 78S05 Datasheet

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Features
TO-220
• Output voltages of 5; 7.5; 9; 10; 12; 15; 18; 24 V
• Thermal protection
• Short circuit protection
• Output transition SOA protection
L78S
2 A positive voltage regulator IC
Datasheet - production data
Description
The L78S series of three-terminal positive regulators is available in TO-220 package and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems assoc ia ted with sing le point regulation. Each type embeds internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 2 A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.

Table 1. Device summary

TO-220 packages
Part numbers
Dual gauge Single gauge
L78S05C L78S05CV-DG L78S05CV 5 V L78S75C L78S75CV-DG L78S75CV 7.5 V L78S09C L78S09CV-DG L78S09CV 9 V L78S10C L78S10CV-DG L78S10CV 10 V L78S12C L78S12CV-DG L78S12CV 12 V L78S15C L78S15CV-DG L78S15CV 15 V L78S18C L78S18CV 18 V L78S24C L78S24CV 24 V
March 2014 DocID2148 Rev 8 1/35
This is information on a product in full production.
Output voltage
www.st.com
Contents L78S
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2/35 DocID2148 Rev 8
L78S List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Electrical characteristics of L78S05C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. Electrical characteristics of L78S75C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 6. Electrical characteristics of L78S09C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 7. Electrical characteristics of L78S10C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. Electrical characteristics of L78S12C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 9. Electrical characteristics of L78S15C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 10. Electrical characteristics of L78S18C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 11. Electrical characteristics of L78S24C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 12. TO-220 (dual gauge) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 13. TO-220 SG (single gauge) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 14. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
DocID2148 Rev 8 3/35
35
List of figures L78S
List of figures
Figure 1. Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. DC parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Load regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. Ripple rejection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Dropout voltage vs. junction temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 9. Peak output current vs. input/output differential voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. Output impedance vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 11. Output voltage vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 12. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 13. Quiescent current vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 14. Load transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 15. Line transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 16. Quiescent current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 17. Fixed output regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 18. Constant current regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 19. Circuit for increasing output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 20. Adjustable output regulator (7 to 30 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 21. 0.5 to 10 V regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 22. High current voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 23. High output current with short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 24. Tracking voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 25. Positive and negative regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 26. Negative output voltage circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 27. Switching regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 28. High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 29. High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 30. High output voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 31. High input and output voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 32. Reducing power dissipation with dropping resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 33. Remote shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 34. Power AM modulator (unity voltage gain, I
Figure 35. Adjustable output voltage with temperature compensation . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 36. Light controllers (V
Figure 37. Protection against input short-circuit with high capacitance loads . . . . . . . . . . . . . . . . . . . 27
Figure 38. TO-220 (dual gauge) drawing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 39. TO-220 SG (single gauge) drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 40. Tube for TO-220 (dual gauge) (mm.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 41. Tube for TO-220 (single gauge) (mm.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
= VXX + VBE). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Omin
£ 1 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
O
4/35 DocID2148 Rev 8
L78S Diagram

1 Diagram

Figure 1. Block diagram

DocID2148 Rev 8 5/35
35
Pin configuration L78S
72
*5281'*5281'

2 Pin configuration

Figure 2. Pin connections (top view)

Figure 3. Schematic diagram

6/35 DocID2148 Rev 8
L78S Maximum ratings
4

3 Maximum ratings

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit
for V
= 5 to 18V 35
O
= 24V 40
for V
O
V
T
P
T
V
I
STG
OP
DC input voltage
I
Output current Internally limited
O
Power dissipation Internally limited
D
Storage temperature range -65 to 150 °C Operating junction temperature range 0 to 150 °C
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.

Table 3. Thermal data

Symbol Parameter TO-220 Unit
R
thJC
R
thJA
Thermal resistance junc tion-case 5 °C/W Thermal resistance junction-ambient 50 °C/W

Figure 4. Application circuits

DocID2148 Rev 8 7/35
35
Test circuits L78S
4
4
4

4 Test circuits

Figure 5. DC parameter

Figure 6. Load regulation

Figure 7. Ripple rejection

8/35 DocID2148 Rev 8
L78S Electrical characterist ics

5 Electrical characteristics

Refer to the test circuits, TJ = 25 °C, VI = 10 V, IO = 500 mA, unless otherwise specified.
Symbol Parameter Test conditions Min. Typ. Max. Unit

T able 4. Electrical characteristics of L78S05C

V V
ΔV
ΔV
ΔI
Output voltage 4.8 5 5.2 V
O
Output voltage IO = 1 A, VI = 7 V 4.75 5 5.25 V
O
= 7 to 25 V 100
V
Line regulation
O
Load regulation
O
I
Quiescent curr ent 8 mA
Q
Quiescent current change
Q
I
VI = 8 to 25 V 50 I
= 20 mA to 1.5 A 100
O
= 2 A 80
I
O
I
= 20 mA to 1 A 0.5
O
= 7 to 25 V, IO = 20 mA 1.3
V
I
ΔVO/ΔT Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C -1.1 mV/°C
eN Output noise voltage B = 10 Hz to 100 kHz 40 µV
SVR Supply voltage rejection f = 120 Hz 54
V
Operating input voltage IO ≤ 1 A 8 V
I
R
I
I
1. Guaranteed by design.
Output resistance f = 1 kHz 17 mΩ
O
Short circuit current VI = 27 V 500 mA
sc
Short circuit peak current 3 A
scp
(1)
mV
mV
mA
dB
DocID2148 Rev 8 9/35
35
Electrical characteristics L78S
Refer to the test circuits, TJ = 25 °C, VI = 12.5 V, IO = 500 mA, unless otherwise specified.
Symbol Parameter Test conditions Min. Typ. Max. Unit

T able 5. Electrical characteristics of L78S75C

V V
ΔV
ΔV
ΔI
ΔV
Output voltage 7.15 7.5 7.9 V
O
Output voltage IO = 1 A, VI = 9.5 V 7.1 7.5 7.95 V
O
V
= 9.5 to 25 V 120
Line regulation
O
Load regulation
O
I
Quiescent curr ent 8 mA
Q
Quiescent current change
Q
/ΔT Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C -0.8 mV/°C
O
I
= 10.5 to 20 V 60
V
I
= 20 mA to 1.5 A 140
I
O
IO = 2 A 100
= 20 mA to 1 A 0.5
I
O
VI = 9.5 to 25 V, IO = 20 mA 1.3
eN Output noise voltage B = 10 Hz to 100 kHz 52 µV
SVR Supply voltage rejection f = 120 Hz 48
V
Operating input voltage IO ≤ 1 A 10. 5 V
I
R
I
I
1. Guaranteed by design.
Output resistance f = 1 kHz 16 mΩ
O
Short circuit current VI = 27 V 500 mA
sc
Short circuit peak current 3 A
scp
(1)
mV
mV
mA
dB
10/35 DocID2148 Rev 8
L78S Electrical characterist ics
Refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 500 mA, unless otherwise specified.
Symbol Parameter Test conditions Min. Typ. Max. Unit

T able 6. Electrical characteristics of L78S09C

V V
ΔV
ΔV
ΔI
ΔV
Output voltage 8.65 9 9.35 V
O
Output voltage IO = 1 A, VI = 11 V 8.6 9 9.4 V
O
V
= 11 to 25 V 130
Line regulation
O
Load regulation
O
I
Quiescent curr ent 8 mA
Q
Quiescent current change
Q
/ΔT Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C -1 mV/°C
O
I
= 11 to 20 V 65
V
I
= 20 mA to 1.5 A 170
I
O
IO = 2 A 100
= 20 mA to 1 A 0.5
I
O
VI = 11 to 25 V, IO = 20 mA 1.3
eN Output noise voltage B = 10 Hz to 100 kHz 60 µV
SVR Supply voltage rejection f = 120 Hz 47
V
Operating input voltage IO ≤ 1 A 12 V
I
R
I
I
1. Guaranteed by design.
Output resistance f = 1 kHz 17 mΩ
O
Short circuit current VI = 27 V 500 mA
sc
Short circuit peak current 3 A
scp
(1)
mV
mV
mA
dB
DocID2148 Rev 8 11/35
35
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