Features
■ Output current to 0.5 A
■ Output voltages of 5; 6; 8; 9; 12; 15; 24 V
■ Thermal overload protection
■ Short circuit protection
■ Output transition SOA protection
Description
The L78Mxx series of three-terminal positive
regulators is available in TO-220, TO-220FP,
DPAK and IPAK 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 shut-down and safe area
protection, making it essentially indestructible. If
adequate heat sinking is provided, they can
deliver over 0.5 A output current. Although
designed primarily as fixed voltage regulators,
these devices can be used with external
components to obtain adjustable voltage and
currents.
L78MxxC
Positive voltage regulators
TO-220
DPAK
TO-220FP
IPAK
Table 1. Device summary
Part numbers
L78M05C L78M12C
L78M06C L78M15C
L78M08C L78M24C
L78M09C
July 2008 Rev 12 1/29
www.st.com
29
Contents L78MxxC
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
2/29
L78MxxC Diagram
1 Diagram
Figure 1. Block diagram
3/29
Pin configuration L78MxxC
2 Pin configuration
Figure 2. Pin connections (top view)
TO-220
DPAK
Figure 3. Schematic diagram
TO220FP
IPAK
4/29
L78MxxC Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
for V
= 5 to 18V 35
O
= 20, 24V 40
for V
O
V
T
P
T
V
I
STG
OP
DC input voltage
I
Output current Internally limited mA
O
Power dissipation Internally limited mW
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 TO-220FP DPAK IPAK Unit
R
R
Thermal resistance junction-case 3 5 8 °C/W
thJC
Thermal resistance junction-ambient 50 60 100 °C/W
thJA
Figure 4. Application circuit
5/29
Test circuits L78MxxC
4 Test circuits
Figure 5. DC parameter
Figure 6. Load regulation
Figure 7. Ripple rejection
6/29
L78MxxC Electrical characteristics
5 Electrical characteristics
Table 4. Electrical characteristics of L78M05C (refer to the test circuits, T
I
= 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
= 25 °C, VI = 10 V,
J
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection V
Output voltage 4.8 5 5.2 V
O
Output voltage IO = 5 to 350 mA, VI = 7 to 20 V 4.75 5 5.25 V
O
V
= 7 to 25 V, IO = 200 mA 100
Line regulation
O
Load regulation
O
Quiescent current 6 mA
I
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA, TJ = 0 to 125°C -0.5 mV/°C
O
I
= 8 to 25 V, IO = 200 mA 50
V
I
I
= 5 to 500 mA, TJ = 25°C 100
O
= 5 to 200 mA, TJ = 25°C 50
I
O
I
= 5 to 350 mA 0.5
O
= 200 mA, VI = 8 to 25 V 0.8
I
O
= 8 to 18 V, f = 120Hz, IO = 300mA 62 dB
I
eN Output noise voltage B =10Hz to 100kHz 40 µV
V
I
Dropout voltage 2 V
d
Short circuit current VI = 35 V 300 mA
sc
mV
mV
mA
Table 5. Electrical characteristics of L78M06C (refer to the test circuits, TJ = 25 °C, VI = 11 V,
I
= 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection V
eN Output noise voltage B =10Hz to 100kHz 45 µV
V
I
Output voltage 5.75 6 6.25 V
O
Output voltage IO = 5 to 350 mA, VI = 8 to 21 V 5.7 6 6.3 V
O
V
= 8 to 25 V, IO = 200 mA 100
Line regulation
O
Load regulation
O
Quiescent current 6 mA
I
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA, TJ = 0 to 125°C -0.5 mV/°C
O
Dropout voltage 2 V
d
Short circuit current VI = 35 V 270 mA
sc
I
= 9 to 25 V, IO = 200 mA 50
V
I
I
= 5 to 500 mA, TJ = 25°C 120
O
= 5 to 200 mA, TJ = 25°C 60
I
O
I
= 5 to 350 mA 0.5
O
= 200 mA, VI = 9 to 25 V 0.8
I
O
= 9 to 19 V, f = 120Hz, IO = 300mA 59 dB
I
mV
mV
mA
7/29
Electrical characteristics L78MxxC
Table 6. Electrical characteristics of L78M08C (refer to the test circuits, T
I
= 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
= 25 °C, VI = 14 V,
J
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection
Output voltage 7.7 8 8.3 V
O
Output voltage IO = 5 to 350 mA, VI = 10.5 to 23 V 7.6 8 8.4 V
O
V
= 10.5 to 25 V, IO = 200 mA 100
Line regulation
O
Load regulation
O
Quiescent current 6 mA
I
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA, TJ = 0 to 125°C -0.5 mV/°C
O
I
= 11 to 25 V, IO = 200 mA 50
V
I
I
= 5 to 500 mA, TJ = 25°C 160
O
= 5 to 200 mA, TJ = 25°C 80
I
O
I
= 5 to 350 mA 0.5
O
= 200 mA, VI = 10.5 to 25 V 0.8
I
O
= 11.5 to 21.5 V, f = 120Hz,
V
I
= 300mA
I
O
56 dB
eN Output noise voltage B =10Hz to 100kHz 52 µV
V
I
Dropout voltage 2 V
d
Short circuit current VI = 35 V 250 mA
sc
Table 7. Electrical characteristics of L78M09C (refer to the test circuits, TJ = 25 °C, VI = 15 V,
I
= 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
mV
mV
mA
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection V
Output voltage 8.65 9 9.35 V
O
Output voltage IO = 5 to 350 mA, VI = 11.5 to 24 V 8.55 9 9.45 V
O
V
= 11.5 to 25 V, IO = 200 mA 100
Line regulation
O
Load regulation
O
Quiescent current 6 mA
I
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA, TJ = 0 to 125°C -0.5 mV/°C
O
I
= 12 to 25 V, IO = 200 mA 50
V
I
I
= 5 to 500 mA, TJ = 25°C 180
O
= 5 to 200 mA, TJ = 25°C 90
I
O
I
= 5 to 350 mA 0.5
O
= 200 mA, VI = 11.5 to 25 V 0.8
I
O
= 12.5 to 23 V, f = 120Hz, IO = 300mA 56 dB
I
eN Output noise voltage B =10Hz to 100kHz 58 µV
V
I
Dropout voltage 2 V
d
Short circuit current VI = 35 V 250 mA
sc
8/29
mV
mV
mA
L78MxxC Electrical characteristics
Table 8. Electrical characteristics of L78M12C (refer to the test circuits, TJ = 25 °C, VI = 19 V,
I
= 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection V
Output voltage 11.5 12 12.5 V
O
Output voltage IO = 5 to 350 mA, VI = 14.5 to 27 V 11.4 12 12.6 V
O
V
= 14.5 to 30 V, IO = 200 mA 100
Line regulation
O
Load regulation
O
Quiescent current 6 mA
I
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA, TJ = 0 to 125°C -1 mV/°C
O
I
= 16 to 30 V, IO = 200 mA 50
V
I
I
= 5 to 500 mA, TJ = 25°C 240
O
= 5 to 200 mA, TJ = 25°C 120
I
O
I
= 5 to 350 mA 0.5
O
= 200 mA, VI = 14.5 to 30 V 0.8
I
O
= 15 to 25 V, f = 120Hz, IO = 300mA 55 dB
I
eN Output noise voltage B =10Hz to 100kHz 75 µV
V
I
Dropout voltage 2 V
d
Short circuit current VI = 35 V 240 mA
sc
Table 9. Electrical characteristics of L78M15C (refer to the test circuits, TJ = 25 °C, VI = 23 V,
I
= 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
O
Symbol Parameter Test conditions Min. Typ. Max. Unit
mV
mV
mA
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection
Output voltage 14.4 15 15.6 V
O
Output voltage IO = 5 to 350 mA, VI = 17.5 to 30 V 14.25 15 15.75 V
O
V
= 17.5 to 30 V, IO = 200 mA 100
Line regulation
O
Load regulation
O
I
Quiescent current 6 mA
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA, TJ = 0 to 125°C -1 mV/°C
O
I
= 20 to 30 V, IO = 200 mA 50
V
I
I
= 5 to 500 mA, TJ = 25°C 300
O
= 5 to 200 mA, TJ = 25°C 150
I
O
I
= 5 to 350 mA 0.5
O
= 200 mA, VI = 17.5 to 30 V 0.8
I
O
= 18.5 to 28.5 V, f = 120Hz,
V
I
= 300mA
I
O
54 dB
eN Output noise voltage B =10Hz to 100kHz 90 µV
V
I
Dropout voltage 2 V
d
Short circuit current VI = 35 V 240 mA
sc
mV
mV
mA
9/29
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