ST MICROELECTRONICS L78M05ABDT STM Datasheet
Features
■ Output current to 0.5 A
■ Output voltages of 5; 6; 8; 9; 10; 12; 15; 18;
24 V
■ Thermal overload protection
■ Short circuit protection
■ Output transition SOA protection
■ ± 2 % Output voltage tolerance
■ Guaranteed in extended temperature range
L78MxxAB
L78MxxAC
Precision 500 mA regulators
TO-220
DPAK
Description
The L78MxxAB series of three-terminal positive
regulators is available in TO-220 and DPAK
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 0.5 A output
current. Although designed primarily as fixed
voltage regulators, these devices can be used
Table 1. Device summary
Part number
L78M05AB L78M10AB
with external components to obtain adjustable
voltage and currents.
L78M05AC L78M12AB
L78M06AB L78M12AC
L78M08AB L78M15AB
L78M08AC L78M24AB
L78M09AB L78M24AC
July 2008 Rev 7 1/29
www.st.com
29
Contents L78MxxAB - L78MxxAC
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7 Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.1 Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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L78MxxAB - L78MxxAC Diagram
1 Diagram
Figure 1. Block diagram
3/29
Pin configuration L78MxxAB - L78MxxAC
2 Pin configuration
Figure 2. Pin connections (top view)
DPAKTO-220
Figure 3. Schematic diagram
4/29
L78MxxAB - L78MxxAC 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
for L78M00AC 0 to 125
for L78M00AB -40 to 125
V
°C
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
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 DPAK Unit
R
thJC
R
thJA
Thermal resistance junction-case 3 8 °C/W
Thermal resistance junction-ambient 50 100 °C/W
Figure 4. Application circuit
5/29
Test circuits L78MxxAB - L78MxxAC
4 Test circuits
Figure 5. DC parameter
Figure 6. Load regulation
Figure 7. Ripple rejection
6/29
L78MxxAB - L78MxxAC Electrical characteristics
5 Electrical characteristics
Table 4. Electrical characteristics of L78M05XX (refer to the test circuits, V
C
= 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise
I
= 10 V, IO = 350 mA,
I
specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection
eN Output noise voltage B =10Hz to 100kHz, T
V
I
I
Output voltage TJ = 25°C 4.9 5 5.1 V
O
Output voltage IO = 5 to 350 mA, VI = 7 to 20 V 4.8 5 5.2 V
O
V
= 7 to 25 V, IO = 200 mA, TJ = 25°C 100
Line regulation
O
Load regulation
O
Quiescent current TJ = 25°C 6 mA
I
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA -0.5 mV/°C
O
Dropout voltage TJ = 25°C 2 V
d
Short circuit current TJ = 25°C, VI = 35 V 300 mA
sc
Short circuit peak current TJ = 25°C 700 mA
scp
I
= 8 to 25 V, IO = 200 mA, TJ = 25°C 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,
V
I
= 25°C
T
J
= 25°C 40 µV
J
62 dB
mV
mV
mA
7/29
Electrical characteristics L78MxxAB - L78MxxAC
Table 5. Electrical characteristics of L78M06XX (refer to the test circuits, VI = 11 V, IO = 350 mA,
C
= 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise
I
specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
ΔV
SVR Supply voltage rejection
Output voltage TJ = 25°C 5.88 6 6.12 V
O
Output voltage IO = 5 to 350 mA, VI = 8 to 21 V 5.75 6 6.3 V
O
V
= 8 to 25 V, IO = 200 mA, TJ = 25°C 100
Line regulation
O
Load regulation
O
Quiescent current TJ = 25°C 6 mA
I
d
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA -0.5 mV/°C
O
I
= 9 to 25 V, IO = 200 mA, TJ = 25°C 30
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,
V
I
= 25°C
T
J
59 dB
eN Output noise voltage B =10Hz to 100kHz 45 µV
V
I
I
Dropout voltage TJ = 25°C 2 V
d
Short circuit current TJ = 25°C, VI = 35 V 270 mA
sc
Short circuit peak current TJ = 25°C 700 mA
scp
mV
mV
mA
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L78MxxAB - L78MxxAC Electrical characteristics
Table 6. Electrical characteristics of L78M08XX (refer to the test circuits, V
C
= 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise
I
= 14 V, IO = 350 mA,
I
specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
Output voltage TJ = 25°C 7.84 8 8.16 V
O
Output voltage IO = 5 to 350 mA, VI = 10.5 to 23 V 7.7 8 8.3 V
O
= 10.5 to 25 V, IO = 200 mA,
V
I
Line regulation
O
Load regulation
O
Quiescent current TJ = 25°C 6 mA
I
d
TJ = 25°C
= 11 to 25 V, IO = 200 mA, TJ = 25°C 30
V
I
I
= 5 to 500 mA, TJ = 25°C 160
O
= 5 to 200 mA, TJ = 25°C 80
I
O
100
IO = 5 to 350 mA 0.5
ΔI
ΔV
SVR Supply voltage rejection
eN Output noise voltage B =10Hz to 100kHz, T
V
I
I
Quiescent current change
d
/ΔT Output voltage drift IO = 5 mA -0.5 mV/°C
O
Dropout voltage TJ = 25°C 2 V
d
Short circuit current TJ = 25°C, VI = 35 V 250 mA
sc
Short circuit peak current TJ = 25°C 700 mA
scp
= 200 mA, VI = 10.5 to 25 V 0.8
I
O
V
= 11.5 to 21.5 V, f = 120Hz
I
IO = 300mA, TJ = 25°C
= 25°C 52 µV
J
56 dB
mV
mV
mA
9/29
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