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L78xxAB
L78xxAC
Precision 1 A regulators
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 D2PAK packages 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 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.
TO-220 |
TO-220FP |
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D2PAK |
Table 1. |
Device summary |
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Order codes |
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L7805AB |
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L7809AC |
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L7805AC |
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L7812AB |
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L7806AB |
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L7812AC |
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L7806AC |
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L7815AB |
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L7808AB |
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L7815AC |
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L7808AC |
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L7824AB |
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L7809AB |
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L7824AC |
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July 2008 |
Rev 17 |
1/26 |
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www.st.com
Contents |
L78xxAB - L78xxAC |
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Contents
1 |
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2 |
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 4 |
3 |
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
4 |
Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
6 |
5 |
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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6 |
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14 |
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6.1 Design consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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7 |
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
8 |
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
24 |
9 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
25 |
2/26
L78xxAB - L78xxAC |
Diagram |
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1 Diagram
Figure 1. Block diagram
Figure 2. Schematic diagram
3/26 |
Pin configuration |
L78xxAB - L78xxAC |
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2 Pin configuration
Figure 3. Pin connections (top view)
TO-220 |
TO-220FP |
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D2PAK |
4/26
L78xxAB - L78xxAC |
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Maximum ratings |
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3 |
Maximum ratings |
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Table 2. |
Absolute maximum ratings |
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Symbol |
Parameter |
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Value |
Unit |
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VI |
DC input voltage |
for VO= 5 to 18V |
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35 |
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V |
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for VO= 20, 24V |
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40 |
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IO |
Output current |
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Internally limited |
mA |
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PD |
Power dissipation |
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Internally limited |
mW |
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TSTG |
Storage temperature range |
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-65 to 150 |
°C |
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TOP |
Operating junction temperature range |
for L7800AC |
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0 to 150 |
°C |
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for L7800AB |
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-40 to 125 |
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Note: |
Absolute maximum ratings are those values beyond which damage to the device may occur. |
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Functional operation under these condition is not implied. |
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Table 3. |
Thermal data |
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Symbol |
Parameter |
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TO-220 |
TO-220FP |
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D2PAK |
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Unit |
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RthJC |
Thermal resistance junction-case |
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3 |
5 |
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3 |
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°C/W |
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RthJA |
Thermal resistance junction-ambient |
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50 |
60 |
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62.5 |
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°C/W |
Figure 4. Application circuit
5/26
Test circuits |
L78xxAB - L78xxAC |
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4 Test circuits
Figure 5. DC parameter
Figure 6. Load regulation
Figure 7. Ripple rejection
6/26
L78xxAB - L78xxAC |
Electrical characteristics |
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5 |
Electrical characteristics |
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Table 4. |
Electrical characteristics of L7805A (VI = 10 V, IO = 1 A, TJ = 0 to 150 °C (L7805AC), |
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TJ = -40 to 125 °C (L7805AB), unless otherwise specified) |
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Symbol |
Parameter |
Test conditions |
Min. |
Typ. |
Max. |
Unit |
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VO |
Output voltage |
TJ = 25°C |
4.9 |
5 |
5.1 |
V |
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VO |
Output voltage |
IO = 5mA to 1A, PO ≤15W |
4.8 |
5 |
5.2 |
V |
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VI = 7.5 to 20V |
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VI = 7.5 to 25V, IO = 500 mA |
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7 |
50 |
mV |
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V (1) |
Line regulation |
VI = 8 to 12V |
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10 |
50 |
mV |
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O |
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VI = 8 to 12V, TJ = 25°C |
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2 |
25 |
mV |
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VI = 7.3 to 20V, TJ = 25°C |
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7 |
50 |
mV |
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IO = 5mA to 1A |
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25 |
100 |
mV |
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VO(*) |
Load regulation |
IO = 5mA to 1.5A, TJ = 25°C |
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30 |
100 |
V |
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IO = 250 to 750mA |
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8 |
50 |
V |
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Iq |
Quiescent current |
TJ = 25°C |
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4.3 |
6 |
mA |
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6 |
mA |
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VI = 8 to 25V, IO = 500 mA |
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0.8 |
mA |
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Iq |
Quiescent current change |
VI = 7.5 to 20V, TJ = 25°C |
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0.8 |
mA |
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IO = 5mA to 1A |
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0.5 |
mA |
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SVR |
Supply voltage rejection |
VI = 8 to 18V, f = 120Hz, IO = 500mA |
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dB |
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Vd |
Dropout voltage |
IO = 1A, TJ = 25°C |
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2 |
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V |
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eN |
Output noise voltage |
TA = 25°C, B =10Hz to 100kHz |
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10 |
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µV/VO |
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RO |
Output resistance |
f =1kHz |
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17 |
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mΩ |
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Isc |
Short circuit current |
VI = 35V, TA = 25°C |
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0.2 |
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A |
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Iscp |
Short circuit peak current |
TJ = 25°C |
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2.2 |
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A |
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VO/ T |
Output voltage drift |
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-1.1 |
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mV/°C |
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.
7/26
Electrical characteristics |
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L78xxAB - L78xxAC |
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Table 5. |
Electrical characteristics of L7806A (VI = 11 V, IO = 1 A, TJ = 0 to 150 °C (L7806AC), |
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TJ = -40 to 125 °C (L7806AB), unless otherwise specified) |
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Symbol |
Parameter |
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Test conditions |
Min. |
Typ. |
Max. |
Unit |
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VO |
Output voltage |
TJ = 25°C |
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5.88 |
6 |
6.12 |
V |
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VO |
Output voltage |
IO = 5mA to 1A, PO ≤15W |
5.76 |
6 |
6.24 |
V |
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VI |
= 8.6 to 21V |
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VI |
= 8.6 to 25V, IO = 500 mA |
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9 |
60 |
mV |
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V |
(1) |
Line regulation |
VI |
= 9 to 13V |
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11 |
60 |
mV |
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O |
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VI = 9 to 13V, TJ = 25°C |
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3 |
30 |
mV |
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VI = 8.3 to 21V, TJ = 25°C |
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9 |
60 |
mV |
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IO = 5mA to 1A |
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25 |
100 |
mV |
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V |
(1) |
Load regulation |
I |
O |
= 5mA to 1.5A, T |
J |
= 25°C |
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30 |
100 |
V |
O |
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IO = 250 to 750mA |
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10 |
50 |
V |
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Iq |
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Quiescent current |
TJ = 25°C |
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4.3 |
6 |
mA |
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6 |
mA |
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VI = 9 to 25V, IO = 500 mA |
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0.8 |
mA |
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Iq |
Quiescent current change |
VI = 8.6 to 21V, TJ = 25°C |
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0.8 |
mA |
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IO = 5mA to 1A |
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0.5 |
mA |
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SVR |
Supply voltage rejection |
VI = 9 to 19V, f = 120Hz, IO = 500mA |
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65 |
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dB |
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Vd |
Dropout voltage |
IO = 1A, TJ = 25°C |
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2 |
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V |
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eN |
Output noise voltage |
TA = 25°C, B =10Hz to 100kHz |
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10 |
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µV/VO |
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RO |
Output resistance |
f =1kHz |
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17 |
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mΩ |
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Isc |
Short circuit current |
VI = 35V, TA = 25°C |
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0.2 |
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A |
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Iscp |
Short circuit peak current |
TJ = 25°C |
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2.2 |
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A |
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VO/ |
T |
Output voltage drift |
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-0.8 |
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mV/°C |
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.
8/26