The L78xx series of three-terminal positive
regulators is available in TO-220, TO-220FP, TO3, D²PAK and DPAK 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 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 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.
Table 1.Device summary
Part numbers
L7805L7806ACL7809ABL7815AB
L7805CL7808CL7809ACL7815AC
L7805ABL7808ABL7812CL7818C
L7805ACL7808ACL7812ABL7824C
TO-3
DPAK
D²PAK
L7806CL7885CL7812ACL7824AB
L7806ABL7809CL7815CL7824AC
May 2012Doc ID 2143 Rev 291/57
This is information on a product in full production.
Refer to the test circuits, TJ = -55 to 150 °C, VI = 10 V, IO = 500 mA, CI = 0.33 µF,
= 0.1 µF unless otherwise specified.
C
O
Table 4.Electrical characteristics of L7805
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
ΔV
ΔV
ΔI
Output voltageTJ = 25°C4.855.2V
O
Output voltageIO = 5 mA to 1 A, VI = 8 to 20 V4.6555.35V
O
= 7 to 25 V, TJ = 25°C350
V
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C6mA
d
Quiescent current change
d
I
VI = 8 to 12 V, TJ = 25°C125
I
= 5 mA to 1.5 A, TJ = 25°C100
O
= 250 to 750 mA, TJ = 25°C25
I
O
I
= 5 mA to 1 A0.5
O
= 8 to 25 V0.8
V
I
ΔVO/ΔTOutput voltage driftIO = 5 mA0.6mV/°C
eNOutput noise voltage B =10 Hz to 100 kHz, T
= 25°C40µV/V
J
SVRSupply voltage rejectionVI = 8 to 18 V, f = 120 Hz68dB
V
R
I
I
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.
VI = 10 V, IO = 1 A, TJ = 0 to 125 °C (L7805AC), TJ = -40 to 125 °C (L7805AB), unless
otherwise specified.
Table 5.Electrical characteristics of L7805A
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
Output voltageTJ = 25°C4.955.1V
O
Output voltageIO = 5 mA to 1 A, VI = 7.5 to 18 V4.855.2V
O
Output voltageIO = 1 A, VI = 18 to 20 V, TJ = 25°C4.855.2V
O
V
= 7.5 to 25 V, IO = 500 mA, TJ = 25°C750mV
I
V
= 8 to 12 V1050mV
(1)
O
Line regulation
I
VI = 8 to 12 V, TJ = 25°C225mV
V
= 7.3 to 20 V, TJ = 25°C750mV
I
IO = 5 mA to 1 A25100mV
(1)
ΔV
ΔI
Load regulation
O
I
Quiescent current
q
Quiescent current change
q
IO = 5 mA to 1.5 A, TJ = 25°C30100V
I
= 250 to 750 mA850V
O
T
= 25°C4.36mA
J
6mA
= 8 to 23 V, IO = 500 mA0.8mA
V
I
V
= 7.5 to 20 V, TJ = 25°C0.8mA
I
IO = 5 mA to 1 A0.5mA
SVRSupply voltage rejectionV
V
Dropout voltageIO = 1 A, TJ = 25°C2V
d
= 8 to 18 V, f = 120 Hz, IO = 500 mA68dB
I
eNOutput noise voltageTA = 25°C, B =10 Hz to 100 kHz10µV/V
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.
VI = 11 V, IO = 1 A, TJ = 0 to 125 °C (L7806AC), TJ = -40 to 125 °C (L7806AB), unless
otherwise specified.
Table 6.Electrical characteristics of L7806A
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
Output voltageTJ = 25°C5.8866.12V
O
Output voltageIO = 5 mA to 1 A, VI = 8.6 to 19 V5.7666.24V
O
Output voltageIO = 1 A, VI = 19 to 21 V, TJ = 25°C5.7666.24V
O
V
= 8.6 to 25 V, IO = 500 mA, TJ = 25°C960mV
I
V
= 9 to 13 V1160mV
(1)
O
Line regulation
I
VI = 9 to 13 V, TJ = 25°C330mV
V
= 8.3 to 21 V, TJ = 25°C960mV
I
IO = 5 mA to 1 A25100mV
(1)
ΔV
ΔI
Load regulation
O
I
Quiescent current
q
Quiescent current change
q
IO = 5 mA to 1.5 A, TJ = 25°C30100V
I
= 250 to 750 mA1050V
O
T
= 25°C4.36mA
J
6mA
= 9 to 24 V, IO = 500 mA0.8mA
V
I
V
= 8.6 to 21 V, TJ = 25°C0.8mA
I
IO = 5 mA to 1 A0.5mA
SVRSupply voltage rejectionV
V
Dropout voltageIO = 1 A, TJ = 25°C2V
d
= 9 to 19 V, f = 120 Hz, IO = 500 mA65dB
I
eNOutput noise voltageTA = 25°C, B =10 Hz to 100 kHz10µV/V
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.
VI = 14 V, IO = 1 A, TJ = 0 to 125 °C (L7808AC), TJ = -40 to 125 °C (L7808AB), unless
otherwise specified.
Table 7.Electrical characteristics of L7808A
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
Output voltageTJ = 25°C7.8488.16V
O
Output voltageIO = 5 mA to 1 A, VI = 10.6 to 21 V7.788.3V
O
Output voltageIO = 1 A, VI = 21 to 23 V, TJ = 25°C7.788.3V
O
(1)
Line regulation
O
(1)
Load regulation
O
Quiescent current
I
q
VI = 10.6 to 25 V, IO = 500 mA,
= 25°C
T
J
VI = 11 to 17 V1580mV
V
= 11 to 17 V, TJ = 25°C540mV
I
V
= 10.4 to 23 V, TJ = 25°C1280mV
I
= 5 mA to 1 A25100mV
I
O
I
= 5 mA to 1.5 A, TJ = 25°C30100V
O
I
= 250 to 750 mA1050V
O
T
= 25°C4.36mA
J
1280mV
6mA
VI = 11 to 23 V, IO = 500 mA0.8mA
ΔI
SVRSupply voltage rejection
V
eNOutput noise voltageT
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.
VI = 15 V, IO = 1 A, TJ = 0 to 125 °C (L7809AC), TJ = -40 to 125 °C (L7809AB), unless
otherwise specified.
Table 8.Electrical characteristics of L7809A
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
Output voltageTJ = 25°C8.8299.18V
O
Output voltageIO = 5 mA to 1 A, VI = 10.6 to 22 V8.6599.35V
O
Output voltageIO = 1 A, VI = 22 to 24 V, TJ = 25°C8.6599.35V
O
(1)
Line regulation
O
(1)
Load regulation
O
Quiescent current
I
q
VI = 10.6 to 25 V, IO = 500 mA,
= 25°C
T
J
VI = 11 to 17 V1590mV
V
= 11 to 17 V, TJ = 25°C545mV
I
V
= 11.4 to 23 V, TJ = 25°C1290mV
I
= 5 mA to 1 A25100mV
I
O
I
= 5 mA to 1.5 A, TJ = 25°C30100V
O
I
= 250 to 750 mA1050V
O
T
= 25°C4.36mA
J
1290mV
6mA
VI = 11 to 25 V, IO = 500 mA0.8mA
ΔI
SVRSupply voltage rejection
V
eNOutput noise voltageT
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.
VI = 19 V, IO = 1 A, TJ = 0 to 125 °C (L7812AC), TJ = -40 to 125 °C (L7812AB), unless
otherwise specified.
Table 9.Electrical characteristics of L7812A
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
Output voltageTJ = 25°C11.751212.25V
O
Output voltageIO = 5 mA to 1 A, VI = 14.8 to 25 V11.51212.5V
O
Output voltageIO = 1 A, VI = 25 to 27 V, TJ = 25°C11.51212.5V
O
(1)
Line regulation
O
(1)
Load regulation
O
Quiescent current
I
q
VI = 14.8 to 30 V, IO = 500 mA,
= 25°C
T
J
VI = 16 to 12 V16120mV
V
= 16 to 12 V, TJ = 25°C660mV
I
V
= 14.5 to 27 V, TJ = 25°C13120mV
I
= 5 mA to 1 A25100mV
I
O
I
= 5 mA to 1.5 A, TJ = 25°C30100V
O
I
= 250 to 750 mA1050V
O
T
= 25°C4.46mA
J
13120mV
6mA
VI = 15 to 30 V, IO = 500 mA0.8mA
ΔI
SVRSupply voltage rejectionV
V
eNOutput noise voltageT
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.
VI = 23 V, IO = 1 A, TJ = 0 to 125 °C (L7815AC), TJ = -40 to 125 °C (L7815AB), unless
otherwise specified.
Table 10.Electrical characteristics of L7815A
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
Output voltageTJ = 25°C14.71515.3V
O
Output voltageIO = 5 mA to 1 A, VI = 17.9 to 28 V14.41515.6V
O
Output voltageIO = 1 A, VI = 28 to 30 V, TJ = 25°C14.41515.6V
O
(1)
Line regulation
O
(1)
Load regulation
O
Quiescent current
I
q
VI = 17.9 to 30 V, IO = 500 mA,
= 25°C
T
J
VI = 20 to 26 V16150mV
V
= 20 to 26 V, TJ = 25°C675mV
I
V
= 17.5 to 30 V, TJ = 25°C13150mV
I
= 5 mA to 1 A25100mV
I
O
I
= 5 mA to 1.5 A, TJ = 25°C30100V
O
I
= 250 to 750 mA1050V
O
T
= 25°C4.46mA
J
13150mV
6mA
VI = 17.5 to 30 V, IO = 500 mA0.8mA
ΔI
SVRSupply voltage rejection
V
eNOutput noise voltageT
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.
VI = 33 V, IO = 1 A, TJ = 0 to 125 °C (L7824AC), TJ = -40 to 125 °C (L7824AB), unless
otherwise specified.
Table 11.Electrical characteristics of L7824A
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
Output voltageTJ = 25°C23.52424.5V
O
Output voltageIO = 5 mA to 1 A, VI = 27.3 to 37 V232425V
O
Output voltageIO = 1 A, VI = 37 to 38 V, TJ = 25°C232425V
O
V
= 27 to 38 V, IO = 500 mA, TJ = 25°C31240mV
I
V
= 30 to 36 V35200mV
(1)
O
Line regulation
I
VI = 30 to 36 V, TJ = 25°C14120mV
V
= 26.7 to 38 V, TJ = 25°C31240mV
I
IO = 5 mA to 1 A25100mV
(1)
ΔV
ΔI
Load regulation
O
I
Quiescent current
q
Quiescent current change
q
IO = 5 mA to 1.5 A, TJ = 25°C30100V
I
= 250 to 750 mA1050V
O
T
= 25°C4.66mA
J
6mA
= 27.3 to 38 V, IO = 500 mA0.8mA
V
I
V
= 27.3 to 38 V, TJ = 25°C0.8mA
I
IO = 5 mA to 1 A0.5mA
SVRSupply voltage rejectionV
V
Dropout voltageIO = 1 A, TJ = 25°C2V
d
= 28 to 38 V, f = 120 Hz, IO = 500 mA54dB
I
eNOutput noise voltageTA = 25°C, B = 10 Hz to 100 kHz10µV/V
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 10 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 12.Electrical characteristics of L7805C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C4.855.2V
O
Output voltageIO = 5 mA to 1 A, VI = 7 to 18 V4.7555.25V
O
Output voltageIO = 1 A, VI = 18 to 20V, TJ = 25°C4.7555.25V
O
V
= 7 to 25 V, TJ = 25°C3100
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1.1mV/°C
O
I
= 8 to 12 V, TJ = 25°C150
V
I
I
= 5 mA to 1.5 A, TJ = 25°C100
O
= 250 to 750 mA, TJ = 25°C50
I
O
I
= 5 mA to 1 A0.5
O
= 7 to 23 V0.8
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C40µV/V
SVRSupply voltage rejectionVI = 8 to 18 V, f = 120 Hz62dB
V
R
I
I
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.
SVRSupply voltage rejectionVI = 9 to 19 V, f = 120 Hz59dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 14 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 14.Electrical characteristics of L7808C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C7.788.3V
O
Output voltageIO = 5 mA to 1 A, VI = 10.5 to 21 V7.688.4V
O
Output voltageIO = 1 A, VI = 21 to 25 V, TJ = 25°C7.688.4V
O
V
= 10.5 to 25 V, TJ = 25°C160
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-0.8mV/°C
O
I
= 11 to 17 V, TJ = 25°C80
V
I
I
= 5 mA to 1.5 A, TJ = 25°C160
O
= 250 to 750 mA, TJ = 25°C80
I
O
I
= 5 mA to 1 A0.5
O
= 10.5 to 25 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C52µV/V
SVRSupply voltage rejectionVI = 11.5 to 21.5 V, f = 120 Hz56dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 14.5 V, IO = 500 mA, CI = 0.33 µF,
C
= 0.1 µF unless otherwise specified.
O
Table 15.Electrical characteristics of L7885C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C8.28.58.8V
O
Output voltageIO = 5 mA to 1 A, VI = 11 to 21.5 V8.18.58.9V
O
Output voltageIO = 1 A, VI = 21.5 to 26 V, TJ = 25°C8.18.58.9V
O
V
= 11 to 27 V, TJ = 25°C160
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-0.8mV/°C
O
I
= 11.5 to 17.5 V, TJ = 25°C80
V
I
I
= 5 mA to 1.5 A, TJ = 25°C160
O
= 250 to 750 mA, TJ = 25°C80
I
O
I
= 5 mA to 1 A0.5
O
= 11 to 26 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C55µV/V
SVRSupply voltage rejectionVI = 12 to 22 V, f = 120 Hz56dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 15 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 16.Electrical characteristics of L7809C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C8.6499.36V
O
Output voltageIO = 5 mA to 1 A, VI = 11.5 to 22 V8.5599.45V
O
Output voltageIO = 1 A, VI = 22 to 26 V, TJ = 25°C8.5599.45V
O
V
= 11.5 to 26 V, TJ = 25°C180
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1mV/°C
O
I
= 12 to 18 V, TJ = 25°C90
V
I
I
= 5 mA to 1.5 A, TJ = 25°C180
O
= 250 to 750 mA, TJ = 25°C90
I
O
I
= 5 mA to 1 A0.5
O
= 11.5 to 26 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C70µV/V
SVRSupply voltage rejectionVI = 12 to 23 V, f = 120 Hz55dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 15 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 17.Electrical characteristics of L7810C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C9.61010.4V
O
Output voltageIO = 5 mA to 1 A, VI = 12.5 to 23 V9.51010.5V
O
Output voltageIO = 1 A, VI = 23 to 26 V, TJ = 25°C9.51010.5V
O
V
= 12.5 to 26 V, TJ = 25°C200
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1mV/°C
O
I
= 13.5 to 19 V, TJ = 25°C100
V
I
I
= 5 mA to 1.5 A, TJ = 25°C200
O
= 250 to 750 mA, TJ = 25°C100
I
O
I
= 5 mA to 1 A0.5
O
= 12.5 to 26 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C70µV/V
SVRSupply voltage rejectionVI = 13 to 23 V, f = 120 Hz55dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 19 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 18.Electrical characteristics of L7812C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C11.51212.5V
O
Output voltageIO = 5 mA to 1 A, VI = 14.5 to 25 V11.41212.6V
O
Output voltageIO = 1 A, VI = 25 to 27 V, TJ = 25°C11.41212.6V
O
V
= 14.5 to 30 V, TJ = 25°C240
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1mV/°C
O
I
= 16 to 22 V, TJ = 25°C120
V
I
I
= 5 mA to 1.5 A, TJ = 25°C240
O
= 250 to 750 mA, TJ = 25°C120
I
O
I
= 5 mA to 1 A0.5
O
= 14.5 to 30 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C75µV/V
SVRSupply voltage rejectionVI = 15 to 25 V, f = 120 Hz55dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 23 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 19.Electrical characteristics of L7815C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C14.51515.6V
O
Output voltageIO = 5 mA to 1 A, VI = 17.5 to 28 V14.251515.75V
O
Output voltageIO = 1 A, VI = 28 to 30 V, TJ = 25°C14.251515.75V
O
V
= 17.5 to 30 V, TJ = 25°C300
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1mV/°C
O
I
= 20 to 26 V, TJ = 25°C150
V
I
I
= 5 mA to 1.5 A, TJ = 25°C300
O
= 250 to 750 mA, TJ = 25°C150
I
O
I
= 5 mA to 1A0.5
O
= 17.5 to 30 V1
V
I
eNOutput noise voltage B = 10 Hz to 100kHz, TJ = 25°C90µV/V
SVRSupply voltage rejectionVI = 18.5 to 28.5 V, f = 120 Hz54dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 26 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 20.Electrical characteristics of L7818C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C17.31818.7V
O
Output voltageIO = 5 mA to 1 A, VI = 21 to 31 V17.11818.9V
O
Output voltageIO = 1 A, VI = 31 to 33 V, TJ = 25°C17.11818.9V
O
V
= 21 to 33 V, TJ = 25°C360
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1mV/°C
O
I
= 24 to 30 V, TJ = 25°C180
V
I
I
= 5 mA to 1.5 A, TJ = 25°C360
O
= 250 to 750 mA, TJ = 25°C180
I
O
I
= 5 mA to 1 A0.5
O
= 21 to 33 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C110µV/V
SVRSupply voltage rejectionVI = 22 to 32 V, f = 120 Hz53dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 28 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 21.Electrical characteristics of L7820C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C19.22020.8V
O
Output voltageIO = 5 mA to 1 A, VI = 23 to 33 V192021V
O
Output voltageIO = 1 A, VI = 33 to 35 V, TJ = 25°C192021V
O
V
= 22.5 to 35 V, TJ = 25°C400
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1mV/°C
O
I
= 26 to 32 V, TJ = 25°C200
V
I
I
= 5 mA to 1.5 A, TJ = 25°C400
O
= 250 to 750 mA, TJ = 25°C200
I
O
I
= 5 mA to 1 A0.5
O
= 23 to 35 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C150µV/V
SVRSupply voltage rejectionVI = 24 to 35 V, f = 120 Hz52dB
V
R
I
I
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.
Refer to the test circuits, TJ = 0 to 125 °C, VI = 33 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF
unless otherwise specified.
Table 22.Electrical characteristics of L7824C
SymbolParameterTest conditionsMin.Typ.Max.Unit
V
V
V
ΔV
ΔV
ΔI
ΔV
Output voltageTJ = 25°C232425V
O
Output voltageIO = 5 mA to 1 A, VI = 27 to 37 V22.82425.2V
O
Output voltageIO = 1 A, VI = 37 to 38 V, TJ = 25°C22.82425.2V
O
V
= 27 to 38 V, TJ = 25°C480
(1)
Line regulation
O
(1)
Load regulation
O
I
Quiescent currentTJ = 25°C8mA
d
Quiescent current change
d
/ΔTOutput voltage driftIO = 5 mA-1.5mV/°C
O
I
= 30 to 36 V, TJ = 25°C240
V
I
I
= 5 mA to 1.5 A, TJ = 25°C480
O
= 250 to 750 mA, TJ = 25°C240
I
O
I
= 5 mA to 1 A0.5
O
= 27 to 38 V1
V
I
eNOutput noise voltage B = 10 Hz to 100 kHz, TJ = 25°C170µV/V
SVRSupply voltage rejectionVI = 28 to 38 V, f = 120 Hz50dB
V
R
I
I
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.
The L78xx Series of fixed voltage regulators are designed with thermal overload protection
that shuts down the circuit when subjected to an excessive power overload condition,
internal short-circuit protection that limits the maximum current the circuit will pass, and
output transistor safe-area compensation that reduces the output short-circuit current as the
voltage across the pass transistor is increased. In many low current applications,
compensation capacitors are not required. However, it is recommended that the regulator
input be bypassed with capacitor if the regulator is connected to the power supply filter with
long lengths, or if the output load capacitance is large. An input bypass capacitor should be
selected to provide good high frequency characteristics to insure stable operation under all
load conditions. A 0.33 µF or larger tantalum, mylar or other capacitor having low internal
impedance at high frequencies should be chosen. The bypass capacitor should be mounted
with the shortest possible leads directly across the regulators input terminals. Normally
good construction techniques should be used to minimize ground loops and lead resistance
drops since the regulator has no external sense lead.
The addition of an operational amplifier allows adjustment to higher or intermediate values
while retaining regulation characteristics. The minimum voltage obtained with the
arrangement is 2 V greater than the regulator voltage.
The circuit of
Figure 13
adding a short circuit sense resistor, RSC, and an additional PNP transistor. The current
sensing PNP must be able to handle the short circuit current of the three terminal regulator
Therefore a four ampere plastic power transistor is specified.
Figure 8.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.
can be modified to provide supply protection against short circuit by
28/57Doc ID 2143 Rev 29
L78xx, L78xxC, L78xxAB, L78xxACApplication information
Figure 9.Current regulator
IO = VXX/R1+I
Figure 10. Circuit for increasing output voltage
IR1 ≥ 5 I
d
VO = VXX(1+R2/R1)+IdR
d
2
Figure 11. Adjustable output regulator (7 to 30 V)
Figure 28. Protection against input short-circuit with high capacitance loads
Note:Application with high capacitance loads and an output voltage greater than 6 volts need an
external diode (see Figure 23 on page 34) 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.
= 10.4 to 23 V ==> VI = 11.4 to 23 V test conditon value
I
Table 31 on page 54
Table 8 on page 13
.
.
,
Figure 39 on page 41
.
.
, added:
Figure 38 on
and
Figure 41 on
and
Ta bl e 1 1
Table 31 on
Table 31 on page 54
,
.
.
10-May-201229
56/57Doc ID 2143 Rev 29
Added: order codes L7806ACV-DG, L7808ACV-DG, L7815ACV-DG,
L7824ABV-DG and L7824ACV-DG
Table 31 on page 54
.
L78xx, L78xxC, L78xxAB, L78xxAC
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