ST L7805AB, L7809AC, L7805AC, L7812AB, L7806AB User Manual
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Features
■ Output current in excess of 1 A
■ Output voltages of 5; 6; 8; 9; 12; 15; 24 V
■ Thermal overload protection
■ Output transition SOA protection
■ 2 % Output voltage tolerance
■ Guaranteed in extended temperature range
Description
The L78xxAB L78xxAC series of three terminal
positive regulators are available in TO-220,
TO-220FP, and D
fixed output voltages, making it useful in a wide
range of applications. These regulators can
provide local on-card regulation, eliminating the
distribution problem 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 1 A output current, although designed
primarily as fixed voltage regulators, these
devices can be used with external components to
obtain adjustable voltage and currents.
2
PAK packages and several
L78xxAB
L78xxAC
Precision 1 A regulators
TO-220
2
PAK
D
TO-220FP
Table 1. Device summary
Order codes
L7805AB L7809AC
L7805AC L7812AB
L7806AB L7812AC
L7806AC L7815AB
L7808AB L7815AC
L7808AC L7824AB
L7809AB L7824AC
July 2008 Rev 17 1/26
www.st.com
26
Contents L78xxAB - L78xxAC
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 Design consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2/26
L78xxAB - L78xxAC Diagram
1 Diagram
Figure 1. Block diagram
Figure 2. Schematic diagram
3/26
Pin configuration L78xxAB - L78xxAC
2 Pin configuration
Figure 3. Pin connections (top view)
TO-220
D
2
PAK
TO-220FP
4/26
L78xxAB - L78xxAC 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 L7800AC 0 to 150
for L7800AB -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 TO-220FP D2PAK U ni t
R
R
thJC
thJA
Thermal resistance junction-case 3 5 3 °C/W
Thermal resistance junction-ambient 50 60 62.5 °C/W
Figure 4. Application circuit
5/26
Test circuits L78xxAB - L78xxAC
4 Test circuits
Figure 5. DC parameter
Figure 6. Load regulation
Figure 7. Ripple rejection
6/26
L78xxAB - L78xxAC Electrical characteristics
5 Electrical characteristics
Table 4. Electrical characteristics of L7805A (VI = 10 V, IO = 1 A, TJ = 0 to 150 °C (L7805AC),
T
= -40 to 125 °C (L7805AB), unless otherwise specified)
J
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔVO(*) Load regulation
ΔI
SVR Supply voltage rejection V
V
eN Output noise voltage T
R
I
I
ΔV
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.
Output voltage TJ = 25°C 4.9 5 5.1 V
O
= 5mA to 1A, PO ≤15W
I
Output voltage
O
(1)
Line regulation
O
I
Quiescent current
q
Quiescent current change
q
Dropout voltage IO = 1A, TJ = 25°C 2 V
d
Output resistance f =1kHz 17 mΩ
O
Short circuit current VI = 35V, TA = 25°C 0.2 A
sc
Short circuit peak current TJ = 25°C 2.2 A
scp
/ΔT Output voltage drift -1.1 mV/°C
O
O
= 7.5 to 20V
V
I
= 7.5 to 25V, IO = 500 mA 7 50 mV
V
I
= 8 to 12V 10 50 mV
V
I
V
= 8 to 12V, TJ = 25°C 2 25 mV
I
= 7.3 to 20V, TJ = 25°C 7 50 mV
V
I
= 5mA to 1A 25 100 mV
I
O
I
= 5mA to 1.5A, TJ = 25°C 30 100 V
O
= 250 to 750mA 8 50 V
I
O
T
= 25°C 4.3 6 mA
J
4.8 5 5.2 V
6mA
V
= 8 to 25V, IO = 500 mA 0.8 mA
I
= 7.5 to 20V, TJ = 25°C 0.8 mA
V
I
I
= 5mA to 1A 0.5 mA
O
= 8 to 18V, f = 120Hz, IO = 500mA 68 dB
I
= 25°C, B =10Hz to 100kHz 10 µV/V
A
O
7/26
Electrical characteristics L78xxAB - L78xxAC
Table 5. Electrical characteristics of L7806A (VI = 11 V, IO = 1 A, TJ = 0 to 150 °C (L7806AC),
T
= -40 to 125 °C (L7806AB), unless otherwise specified)
J
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
V
ΔV
ΔV
ΔI
SVR Supply voltage rejection V
V
eN Output noise voltage T
R
I
I
ΔV
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.
Output voltage TJ = 25°C 5.88 6 6.12 V
O
= 5mA to 1A, PO ≤15W
I
Output voltage
O
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent current
q
Quiescent current change
q
Dropout voltage IO = 1A, TJ = 25°C 2 V
d
Output resistance f =1kHz 17 mΩ
O
Short circuit current VI = 35V, TA = 25°C 0.2 A
sc
Short circuit peak current TJ = 25°C 2.2 A
scp
/ΔT Output voltage drift -0.8 mV/°C
O
O
= 8.6 to 21V
V
I
= 8.6 to 25V, IO = 500 mA 9 60 mV
V
I
= 9 to 13V 11 60 mV
V
I
V
= 9 to 13V, TJ = 25°C 3 30 mV
I
= 8.3 to 21V, TJ = 25°C 9 60 mV
V
I
= 5mA to 1A 25 100 mV
I
O
I
= 5mA to 1.5A, TJ = 25°C 30 100 V
O
= 250 to 750mA 10 50 V
I
O
T
= 25°C 4.3 6 mA
J
5.76 6 6.24 V
6mA
V
= 9 to 25V, IO = 500 mA 0.8 mA
I
= 8.6 to 21V, TJ = 25°C 0.8 mA
V
I
I
= 5mA to 1A 0.5 mA
O
= 9 to 19V, f = 120Hz, IO = 500mA 65 dB
I
= 25°C, B =10Hz to 100kHz 10 µV/V
A
O
8/26
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