Page 1
Feature summary
■ Output current to 2A
■ Output voltages of 5; 7.5; 9; 10; 12; 15; 18; 24V
■ Thermal overload protection
■ Short circuit protection
■ Output transition SOA protection
Description
The L78S00 series of three-terminal positive
regulators is available in TO-220 and TO-3
packages and with 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
associated with single point regulation. Each type
employs internal current limiting, thermal shutdown and safe area protection, making it
essentially indestructible. If adequate heat sinking
is provided, they can deliver over 2A output
L78S00 series
2A Positive voltage regulators
TO-220
TO-3
current. Although designed primarily as fixed
voltage regulators, these devices can be used
with external components to obtain adjustable
voltages and currents.
Schematic diagram
September 2006 Rev. 2 1/35
www.st.com
35
Page 2
L78S00 series
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2/35
Page 3
L78S00 series Pin configuration
1 Pin configuration
Figure 1. Pin connections (top view)
TO-220
Figure 2. Schematic diagram
TO-3
3/35
Page 4
Maximum ratings L78S00 series
2 Maximum ratings
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
for V
= 5 to 18V 35
O
= 24V 40
for V
O
for L78S00 -55 to 150
for L78S00C 0 to 150
V
°C
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
Note: Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied.
Table 2. Thermal Data
Symbol Parameter TO-220 TO-3 Unit
R
thJC
R
thJA
Thermal resistance junction-case 5 4 °C/W
Thermal resistance junction-ambient 50 35 °C/W
Figure 3. Application circuits
4/35
Page 5
L78S00 series Test circuits
3 Test circuits
Figure 4. DC Parameter
Figure 5. Load regulation
Figure 6. Ripple rejection
5/35
Page 6
Electrical characteristics L78S00 series
4 Electrical characteristics
Table 3. Electrical characteristics of L78S05 (refer to the test circuits, TJ = 25°C, VI = 10V, IO = 500
mA, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
Output voltage 4.8 5 5.2 V
O
Output voltage IO = 1A, VI = 7V 4.75 5 5.25 V
O
V
= 7 to 25V 100
Line regulation
O
Load regulation IO = 20 mA to 2A 100 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 8 to 25V 50
V
I
I
= 20mA to 1A 0.5
O
= 7 to 25 V, IO = 20mA 1.3
V
I
mV
mA
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -1.1 mV/°C
eN Output noise voltage B =10Hz to 100KHz 40 µV
SVR Supply voltage rejection f = 120Hz 60 dB
V
R
I
Dropout voltage IO ≤ 1A 8 V
d
Output resistance f = 1 KHz 17 mΩ
O
I
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
6/35
Page 7
L78S00 series Electrical characteristics
Table 4. Electrical characteristics of L78S75 (refer to the test circuits, TJ = 25°C, VI = 12.5V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
Output voltage 7.15 7.5 7.9 V
O
Output voltage IO = 1A, VI = 9.5V 7.1 7.5 7.95 V
O
V
= 9.5 to 25V 120
Line regulation
O
Load regulation IO = 20 mA to 2A 120 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 10.5 to 20V 60
V
I
I
= 20mA to 1A 0.5
O
= 20mA, VI = 9.5 to 25V 1.3
I
O
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -0.8 mV/°C
eN Output noise voltage B =10Hz to 100KHz 52 µV
SVR Supply voltage rejection f = 120Hz 54 dB
V
R
I
I
Dropout voltage IO ≤ 1.5A 10.5 V
d
Output resistance f = 1 KHz 16 mΩ
O
Short circuit current VI =27V 500 mA
sc
Short circuit peak current 3 A
scp
Table 5. Electrical characteristics of L78S09 (refer to the test circuits, TJ = 25°C, VI = 14V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
mV
mA
V
V
∆V
∆V
∆I
Output voltage 8.65 9 9.35 V
O
Output voltage IO = 1A, VI = 11V 8.6 9 9.4 V
O
V
= 11 to 25V 130
Line regulation
O
Load regulation IO = 20 mA to 2A 130 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 11 to 20V 65
V
I
I
= 20mA to 1A 0.5
O
= 11 to 25 V, IO = 20mA 1.3
V
I
mV
mA
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -1 mV/°C
eN Output noise voltage B =10Hz to 100KHz 60 µV
SVR Supply voltage rejection f = 120Hz 53 dB
V
R
I
I
Dropout voltage IO ≤ 1.5A 12 V
d
Output resistance f = 1 KHz 17 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
7/35
Page 8
Electrical characteristics L78S00 series
Table 6. Electrical characteristics of L78S10 (refer to the test circuits, TJ = 25°C, VI = 15V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
Output voltage 9.5 10 10.5 V
O
Output voltage IO = 1A, VI = 12.5V 9.4 10 10.6 V
O
V
= 12.5 to 30V 200
Line regulation
O
Load regulation IO = 20 mA to 2A 150 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 14 to 22V 100
V
I
I
= 20mA to 1A 0.5
O
= 12.5 to 30 V, IO = 20mA 1
V
I
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -1 mV/°C
eN Output noise voltage B =10Hz to 100KHz 65 µV
SVR Supply voltage rejection f = 120Hz 53 dB
V
R
I
I
Dropout voltage IO ≤ 1.5A 13 V
d
Output resistance f = 1 KHz 17 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
Table 7. Electrical characteristics of L78S12 (refer to the test circuits, TJ = 25°C, VI = 19V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
mV
mA
V
V
∆V
∆V
∆I
Output voltage 11.5 12 12.5 V
O
Output voltage IO = 1A, VI = 14.5V 11.41212.6 V
O
V
= 14.5 to 30V 240
Line regulation
O
Load regulation IO = 20 mA to 2A 160 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 16 to 22V 120
V
I
I
= 20mA to 1A 0.5
O
= 14.5 to 30 V, IO = 20mA 1
V
I
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -1 mV/°C
eN Output noise voltage B =10Hz to 100KHz 75 µV
SVR Supply voltage rejection f = 120Hz 53 dB
V
R
I
I
Dropout voltage IO ≤ 1.5A 15 V
d
Output resistance f = 1 KHz 18 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
8/35
mV
mA
Page 9
L78S00 series Electrical characteristics
Table 8. Electrical characteristics of L78S15 (refer to the test circuits, TJ = 25°C, VI = 23V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
Output voltage 14.4 15 15.6 V
O
Output voltage IO = 1A, VI = 17.5V 14.25 15 15.75 V
O
V
= 17.5 to 30V 300
Line regulation
O
Load regulation IO = 20 mA to 2A 180 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 20 to 26V 150
V
I
I
= 20mA to 1A 0.5
O
= 17.5 to 30 V, IO = 20mA 1
V
I
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -1 mV/°C
eN Output noise voltage B =10Hz to 100KHz 90 µV
SVR Supply voltage rejection f = 120Hz 52 dB
V
R
I
I
Dropout voltage IO ≤ 1.5A 18 V
d
Output resistance f = 1 KHz 19 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
Table 9. Electrical characteristics of L78S18 (refer to the test circuits, TJ = 25°C, VI = 26V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
mV
mA
V
V
∆V
∆V
∆I
Output voltage 17.1 18 18.9 V
O
Output voltage IO = 1A, VI = 20.5V 17 18 19 V
O
V
= 20.5 to 30V 360
Line regulation
O
Load regulation IO = 20 mA to 2A 200 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 22 to 28V 180
V
I
I
= 20mA to 1A 0.5
O
= 20.5 to 30 V, IO = 20mA 1
V
I
mV
mA
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -1 mV/°C
eN Output noise voltage B =10Hz to 100KHz 110 µV
SVR Supply voltage rejection f = 120Hz 49 dB
V
R
I
I
Dropout voltage IO ≤ 1.5A 21 V
d
Output resistance f = 1 KHz 22 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
9/35
Page 10
Electrical characteristics L78S00 series
Table 10. Electrical characteristics of L78S24 (refer to the test circuits, TJ = 25°C, VI = 33V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
Output voltage 23 24 25 V
O
Output voltage IO = 1A, VI = 27V 22.82425.2 V
O
V
= 27 to 38V 480
Line regulation
O
Load regulation IO = 20 mA to 2A 250 mV
O
I
Quiescent current 8 mA
d
Quiescent current change
d
I
= 30 to 36V 240
V
I
I
= 20mA to 1A 0.5
O
= 27 to 38 V, IO = 20mA 1
V
I
mV
mA
∆VO/∆T Output voltage drift IO = 5mA, TJ = -55°C to 150°C -1.5 mV/°C
eN Output noise voltage B =10Hz to 100KHz 170 µV
SVR Supply voltage rejection f = 120Hz 48 dB
V
R
I
I
Dropout voltage IO ≤ 1.5A 27 V
d
Output resistance f = 1 KHz 23 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
10/35
Page 11
L78S00 series Electrical characteristics
Table 11. Electrical characteristics of L78S05C (refer to the test circuits, TJ = 25°C, VI = 10V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 4.8 5 5.2 V
O
Output voltage IO = 1A, VI = 7V 4.75 5 5.25 V
O
V
= 7 to 25V 100
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -1.1 mV/°C
O
I
= 8 to 25V 50
V
I
= 20 mA to 1.5A 100
I
O
IO = 2A 80
= 20mA to 1A 0.5
I
O
VI = 7 to 25 V, IO = 20mA 1.3
eN Output noise voltage B =10Hz to 100KHz 40 µV
SVR Supply voltage rejection f = 120Hz 54 dB
V
R
I
I
Dropout voltage IO ≤ 1A 8 V
d
Output resistance f = 1 KHz 17 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
11/35
Page 12
Electrical characteristics L78S00 series
Table 12. Electrical characteristics of L78S75C (refer to the test circuits, TJ = 25°C, VI = 12.5V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 7.15 7.5 7.9 V
O
Output voltage IO = 1A, VI = 9.5V 7.1 7.5 7.95 V
O
V
= 9.5 to 25V 120
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -0.8 mV/°C
O
I
= 10.5 to 20V 60
V
I
= 20 mA to 1.5A 140
I
O
IO = 2A 100
= 20mA to 1A 0.5
I
O
VI = 9.5 to 25 V, IO = 20mA 1.3
eN Output noise voltage B =10Hz to 100KHz 52 µV
SVR Supply voltage rejection f = 120Hz 48 dB
V
R
I
I
Dropout voltage IO ≤ 1A 10.5 V
d
Output resistance f = 1 KHz 16 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
12/35
Page 13
L78S00 series Electrical characteristics
Table 13. Electrical characteristics of L78S09C (refer to the test circuits, TJ = 25°C, VI = 14V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 8.65 9 9.35 V
O
Output voltage IO = 1A, VI = 11V 8.6 9 9.4 V
O
V
= 11 to 25V 130
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -1 mV/°C
O
I
= 11 to 20V 65
V
I
= 20 mA to 1.5A 170
I
O
IO = 2A 100
= 20mA to 1A 0.5
I
O
VI = 11 to 25 V, IO = 20mA 1.3
eN Output noise voltage B =10Hz to 100KHz 60 µV
SVR Supply voltage rejection f = 120Hz 47 dB
V
R
I
I
Dropout voltage IO ≤ 1A 12 V
d
Output resistance f = 1 KHz 17 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
13/35
Page 14
Electrical characteristics L78S00 series
Table 14. Electrical characteristics of L78S10C (refer to the test circuits, TJ = 25°C, VI = 15V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 9.5 10 10.5 V
O
Output voltage IO = 1A, VI = 12.5V 9.4 10 10.6 V
O
V
= 12.5 to 30V 200
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -1 mV/°C
O
I
= 14 to 22V 100
V
I
= 20 mA to 1.5A 240
I
O
IO = 2A 150
= 20mA to 1A 0.5
I
O
VI = 12.5 to 30 V, IO = 20mA 1
eN Output noise voltage B =10Hz to 100KHz 65 µV
SVR Supply voltage rejection f = 120Hz 47 dB
V
R
I
I
Dropout voltage IO ≤ 1A 13 V
d
Output resistance f = 1 KHz 17 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
14/35
Page 15
L78S00 series Electrical characteristics
Table 15. Electrical characteristics of L78S12C (refer to the test circuits, TJ = 25°C, VI = 19V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 11.5 12 12.5 V
O
Output voltage IO = 1A, VI = 14.5V 11.41212.6 V
O
V
= 14.5 to 30V 240
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -1 mV/°C
O
I
= 16 to 22V 120
V
I
= 20 mA to 1.5A 240
I
O
IO = 2A 150
= 20mA to 1A 0.5
I
O
VI = 14.5 to 30 V, IO = 20mA 1
eN Output noise voltage B =10Hz to 100KHz 75 µV
SVR Supply voltage rejection f = 120Hz 47 dB
V
R
I
I
Dropout voltage IO ≤ 1A 15 V
d
Output resistance f = 1 KHz 18 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
15/35
Page 16
Electrical characteristics L78S00 series
Table 16. Electrical characteristics of L78S15C (refer to the test circuits, TJ = 25°C, VI = 23V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 14.4 15 15.6 V
O
Output voltage IO = 1A, VI = 17.5V 14.25 15 15.75 V
O
V
= 17.5 to 30V 300
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -1 mV/°C
O
I
= 20 to 26V 150
V
I
= 20 mA to 1.5A 300
I
O
IO = 2A 150
= 20mA to 1A 0.5
I
O
VI = 17.5 to 30 V, IO = 20mA 1
eN Output noise voltage B =10Hz to 100KHz 90 µV
SVR Supply voltage rejection f = 120Hz 46 dB
V
R
I
I
Dropout voltage IO ≤ 1A 18 V
d
Output resistance f = 1 KHz 19 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
16/35
Page 17
L78S00 series Electrical characteristics
Table 17. Electrical characteristics of L78S18C (refer to the test circuits, TJ = 25°C, VI = 26V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 17.1 18 18.9 V
O
Output voltage IO = 1A, VI = 20.5V 17 18 19 V
O
V
= 20.5 to 30V 360
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -1 mV/°C
O
I
= 22 to 28V 180
V
I
= 20 mA to 1.5A 360
I
O
IO = 2A 200
= 20mA to 1A 0.5
I
O
VI = 20.5 to 30 V, IO = 20mA 1
eN Output noise voltage B =10Hz to 100KHz 110 µV
SVR Supply voltage rejection f = 120Hz 43 dB
V
R
I
I
Dropout voltage IO ≤ 1A 21 V
d
Output resistance f = 1 KHz 22 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
17/35
Page 18
Electrical characteristics L78S00 series
Table 18. Electrical characteristics of L78S24C (refer to the test circuits, TJ = 25°C, VI = 33V,
I
= 500 mA, unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
∆V
∆V
∆I
∆V
Output voltage 23 24 25 V
O
Output voltage IO = 1A, VI = 27V 22.82425.2 V
O
V
= 27 to 38V 480
Line regulation
O
Load regulation
O
I
Quiescent current 8 mA
d
Quiescent current change
d
/∆T Output voltage drift IO = 5mA, TJ = 0°C to 70°C -1.5 mV/°C
O
I
= 30 to 36V 240
V
I
= 20 mA to 1.5A 480
I
O
IO = 2A 300
= 20mA to 1A 0.5
I
O
VI = 27 to 38 V, IO = 20mA 1
eN Output noise voltage B =10Hz to 100KHz 170 µV
SVR Supply voltage rejection f = 120Hz 42 dB
V
R
I
I
Dropout voltage IO ≤ 1A 27 V
d
Output resistance f = 1 KHz 28 mΩ
O
Short circuit current VI = 27V 500 mA
sc
Short circuit peak current 3 A
scp
mV
mV
mA
18/35
Page 19
L78S00 series Typical performance
5 Typical performance
Figure 7. Dropout voltage vs junction
temperature
Figure 9. Output impedance vs frequency
Figure 8. Peak output current vs input/output
differential voltage
Figure 10. Output voltage vs junction
temperature
Figure 11. Supply voltage rejection vs
frequency
Figure 12. Quiescent current vs junction
temperature
19/35
Page 20
Typical performance L78S00 series
Figure 13. Load transient response
Figure 15. Quiescent current vs input voltage
Figure 14. Line transient response
20/35
Page 21
L78S00 series Typical performance
Figure 16. Fixed output regulator
1. To specify an output voltage, substitute voltage value for "XX".
2. Although no output capacitor is need for stability, it does improve transient response.
3. Required if regulator is locate an appreciable distance from power supply filter.
Figure 17. Constant current regulator
IO = VXX/R1+I
Figure 18. Circuit for increasing output voltage
IR1 ≥ 5 I
d
VO = VXX(1+R2/R1)+IdR
d
2
21/35
Page 22
Typical performance L78S00 series
Figure 19. Adjustable output regulator (7 to 30V)
Figure 20. 0.5 to 10V Regulator
VO=VXXR4/R
1
22/35
Page 23
L78S00 series Typical performance
Figure 21. High current voltage regulator
V
I
REQ
REG
BEQ1
-(IQ1/βQ1)
+ Q1 (I
REG
V
BEQ1
______)
R
1
R1 = ______________
IO = I
Figure 22. High output current with short circuit protection
RSC=V
BEQ2/ISC
23/35
Page 24
Typical performance L78S00 series
Figure 23. Tracking voltage regulator
Figure 24. Positive and negative regulator
24/35
Page 25
L78S00 series Typical performance
Figure 25. Negative output voltage circuit
Figure 26. Switching regulator
Figure 27. High input voltage circuit
VIN = VI - (VZ + VBE)
25/35
Page 26
Typical performance L78S00 series
Figure 28. High input voltage circuit
Figure 29. High output voltage regulator
Figure 30. High input and output voltage
VO = VXX + V
Z1
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Page 27
L78S00 series Typical performance
Figure 31. Reducing power dissipation with dropping resistor
V
I(min)-VXX-VDROP(max)
R = ____________________
I
O(max)+Id(max)
Figure 32. Remote shutdown
Figure 33. Power AM modulator (unity voltage gain, IO ≤ 1A)
Note: The circuit performs well up to 100 KHz.
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Page 28
Typical performance L78S00 series
Figure 34. Adjustable output voltage with temperature compensation
VO = VXX (1+R2/R1) + V
BE
Note: Q2 is connected as a diode in order to compensate the variation of the Q1 VBE with the
temperature. C allows a slow rise time of the V
Figure 35. Light controllers (V
= VXX + VBE)
Omin
.
O
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falls when the light goes up
V
O
VO rises when the light goes up
Page 29
L78S00 series Typical performance
Figure 36. Protection against input short-circuit with high capacitance loads
1. Application with high capacitance loads and an output voltage greater than 6 volts need an external diode
(see fig. 32) to protect the device against input short circuit. In this case the input voltage falls rapidly while
the output voltage decrease slowly. The capacitance discharges by means of the Base-Emitter junction of
the series pass transistor in the regulator. If the energy is sufficiently high, the transistor may be destroyed.
The external diode by-passes the current from the IC to ground.
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Page 30
Package mechanical data L78S00 series
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
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Page 31
L78S00 series Package mechanical data
TO-3 MECHANICAL DATA
DIM.
A 11.85 0.466
B 0.96 1.05 1.10 0.037 0.041 0.043
C 1.70 0.066
D 8.7 0.342
E 20.0 0.787
G 10.9 0.429
N 16.9 0.665
P 26.2 1.031
R 3.88 4.09 0.152 0.161
U 39.5 1.555
V 30.10 1.185
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
P
A
G
U
V
N
O
B
D
C
E
R
P003C/C
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Page 32
Package mechanical data L78S00 series
TO-220 MECHANICAL DAT
DIM.
A 4.40 4.60 0.173 0.181
C 1.23 1.32 0.048 0.051
D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E 0.49 0.70 0.019 0.027
F 0.61 0.88 0.024 0.034
F1 1.14 1.70 0.044 0.067
F2 1.14 1.70 0.044 0.067
G 4.95 5.15 0.194 0.203
G1 2.4 2.7 0.094 0.106
H2 10.0 10.40 0.393 0.409
L2 16.4 0.645
L4 13.0 14.0 0.511 0.551
L5 2.65 2.95 0.104 0.116
L6 15.25 15.75 0.600 0.620
L7 6.2 6.6 0.244 0.260
L9 3.5 3.93 0.137 0.154
DIA. 3.75 3.85 0.147 0.151
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
A
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P011C
Page 33
L78S00 series Order code
7 Order code
Table 19. Order code
Packaging
Part numbers
TO-220 T0-3 Output voltage
L78S05 L78S05T
L78S05C L78S05CV L78S05CT
L78S75 L78S75T
L78S75C L78S75CV L78S75CT
L78S09 L78S09T
L78S09C L78S09CV 9 V
L78S10 L78S10T
L78S10C L78S10CV L78S10CT
L78S12 L78S12T
L78S12C L78S12CV L78S12CT 12 V
L78S15 L78S15T
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
5 V
5 V
7.5 V
7.5 V
9 V
10 V
10 V
12 V
15 V
L78S15C L78S15CV L78S15CT 15 V
L78S18 L78S18T
(1)
L78S18C L78S18CV 18 V
L78S24 L78S24T
L78S24C L78S24CV L78S24CT
1. Available on request.
(1)
(1)
18 V
24 V
24 V
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Page 34
Revision history L78S00 series
8 Revision history
Table 20. Revision history
Date Revision Changes
07-Sep-2006 2 Order Codes has been updated and new template.
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Page 35
L78S00 series
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