D
es
c
ri
p
t
i
o
n
L
XX
This series of fixed-voltage monolithic integrated-circuit voltage regulators is designed for a wide range of applications. These applicatio
ns
include on-card regulation for elimination of noise and distributionproblems associated with single-point regulation. In addition, they can
be
used with power-pass elements to make high-current voltage regulators. Each of these regulators can deliver up to 100 mA of out
put
current. The internal limiting and termal shutdown features of these regulators make them essentially immune to overlo
ad.
When used as a replacement for a Zener diode-resistor combination, an effective improvement in output impedance ca
n be
obtained together with lower-bias current.
F
ea
tu
res
•
3
-
T
erm
i
nal
R
e
g
u
l
a
t
ors
•
Output Current Up to 100 mA
•
No External Components
•
Internal Thermal Overload Protection
•
I
n
t
ern
a
l
Short
-
C
irc
u
it
Limi
t
ing
P
ackag
e
T
O
-
9
2
(t
o
p
v
i
e
w
)
Internal Block Digram
Packa
g
e
O
C
I
G
N
D
R
1
Voltage
r
e
f
e
r
en
ce
R
2
O
UTPUT
Con
t
e
k
Protectio
n
circ
u
i
t
r
y
R
S
C
INPUT
1
BE
IJI
N
G
ES
T
E
K
ELE
CTR
O
N
I
C
S C
O
.,
L
T
D
A
b
s
o
l
ut
e
Maximum
Ra
t
i
n
gs
L
XX
over
o
p
era
t
i
ng
t
e
m
pe
r
a
t
ure
r
a
nge
(
un
l
ess
o
t
her
w
ise
n
o
t
ed)
79L05A
79L12A
Parameter
t
h
r
u
T
HRU
7
9
L2
4
A
U
n
i
ts
79L08A 79L18A
I
nput
vol
t
a
ge
-
30
-
35
-
40
V
Operating free-air, case, or virtual junction
t
e
m
pe
r
a
t
u
r
e
r
ang
e
0
t
o
150
0
t
o
150
0
t
o
150
°
C
S
t
orage
t
e
m
pe
r
a
t
ure
r
an
g
e
-
65
t
o
1
5
0
-
65
t
o
1
5
0
-
65
t
o
1
5
0
Le
a
d
t
empe
r
a
t
ure
1
.
6
mm
(1
/
16
i
n
ch)
f
rom
case
260
260
260
f
or
10
sec
o
nds
Recommended Operating Conditions
Parameter Min Max Units
79L05A -7 -20
79L06A -8 -20
79
L
08A
-
10
.
5
-
23
I
nput
vol
t
a
ge
V
I
79L12A -14.5 -27
79L15A -17.5 -30
79L18A -20.5 -33
79
L
24A
-
27
-
38
V
Output current, I
O
100
mA
Operating virtual junction temperature, T
J
0 125
°
C
Device
Selec
t
ion
G
ui
d
e
Ou
t
pu
t
V
o
l
t
a
ge
D
e
v
ice
-
5
V
-6 V
-8 V
-12 V
-15 V
-18 V
-
24
V
79
L
05A
79L06A
79L08A
79L12A
79L15A
79L18A
79
L
24A
Elec
t
rical
C
h
aracteris
t
ics
79
L
05A
Elec
t
ri
c
al
c
h
arac
t
e
r
is
t
ics
at
sp
e
ci
f
i
e
d
vir
t
u
a
l
j
u
nc
t
i
o
n
t
empe
r
a
t
ure,
V
I
=
-
10V,
I
O
=
40mA
(un
l
ess
o
t
her
w
ise
n
o
t
ed)
P
a
r
am
e
ter
T
e
s
t
c
o
n
d
i
t
i
o
ns*
O
u
t
put
vol
t
a
ge
*
*
79L05A
Min Typ Max
25
°
C
-
4
.
8
-
5
-
5
.
2
U
n
i
ts
V
I
nput
re
g
ula
t
ion
I
O
= 1mA to 40 mA, V
I
= -7V to -
20V
I
O
= 1mA to 70mA,
V
I
= -7V to -20V
V
I
= -8V to -20V
0
°
C
t
o
125
°
C
25
°
C
-
4
.
75
-
5
.
25
-4.75 -5.25
15 150
12
100
mV
R
ipple
r
ej
e
c
t
ion
V
I
=
-
8V
t
o
-
18V,
f
=
120
H
z
25
°
C
41
49
dB
Output regulation I
O
= 1mA to
100mA
I
O
= 1mA to 40mA
25
°
C
20
60
10
30
mV
Output noise voltage f= 10Hz to 100 KHz 25
°
C 40
µ
V
Dropout voltage 25
°
C 1.7
V
Bias
cur
r
ent
25
°
C
6
125
°
C
5
.
5
mA
Bias current change V
I
= -8V to -20V
I
O
= 1mA to 40mA
0
°
C
t
o
125
°
C
1
.
5
0
.
1
BE
IJI
N
G
ES
T
E
K
ELE
CTR
O
N
I
C
S C
O
.,
L
T
D
2
L
XX
Elec
t
rical
C
h
aracteris
t
ics
79
L
06A
Elec
t
ri
c
al
c
h
arac
t
e
r
is
t
ics
at
sp
e
ci
f
i
e
d
vir
t
u
a
l
j
u
nc
t
i
o
n
t
empe
r
a
t
ure,
V
I
=
-
11V,
I
O
=
40mA
(un
l
ess
o
t
her
w
ise
n
o
t
ed)
P
a
r
am
e
ter
T
e
s
t
c
o
n
d
i
t
i
o
ns*
Output voltage** I
O
= 1mA to 40 mA, V
I
= -8V to -20V
I
O
= 1mA to 70mA,
Input regulation V
I
= -8V to -20V
V
I
= -9V to -20V
79L06A
Min Typ Max
25
°
C -5.75 -6 -6.25
0
°
C to 125
°
C -5.7 -6.3
25
°
C 20 175
15
125
U
n
i
ts
V
mV
R
ipple
r
ej
e
c
t
ion
V
I
=
-
9V
t
o
-
19V,
f
=
120
H
z
25
°
C
40
48
dB
Output regulation I
O
= 1mA to
100mA
I
O
= 1mA to 40mA
25
°
C
21
80
11
40
mV
Output noise voltage f= 10Hz to 100 KHz 25
°
C 44
µ
V
Dropout voltage 25
°
C 1.7
V
Bias current 25
°
C 6
125
°
C 5.5
Bias current change V
I
= -9V to -20V
I
O
= 1mA to 40mA
0
°
C
t
o
125
°
C
1
.
5
0
.
1
mA
* Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal
effects must be taken into account separately. All characteristics are measured with a 0.33
µ
F capacitor across the input and a 0.1
µ
F
capacitor across the output.
**
T
his
s
pe
c
i
f
ica
t
i
on
a
pp
l
ies
o
nl
y
f
or
dc
po
w
er
dis
s
i
p
a
t
ion
per
m
i
tt
ed
by
abs
o
lu
t
e
m
a
xim
u
m
ra
t
i
n
gs.
Elec
t
rical
C
h
aracteris
t
ics
79
L
08A
Elec
t
ri
c
al
c
h
arac
t
e
r
is
t
ics
at
sp
e
ci
f
i
e
d
vir
t
u
a
l
j
u
nc
t
i
o
n
t
empe
r
a
t
ure,
V
I
=
-
14V,
I
O
=
40mA
(un
l
ess
o
t
her
w
ise
n
o
t
ed)
P
a
r
am
e
ter
T
e
s
t
c
o
n
d
i
t
i
o
ns*
Output voltage** I
O
= 1mA to 40 mA, V
I
= -10.5V to -
23V
I
O
= 1mA to 70mA,
Input regulation V
I
= -10,5V to
–
23V
V
I
= -11V to -23V
79L08A
Min Typ Max
25
°
C -7.7 -8 -8.3
0
°
C to 125
°
C -7.6 -8.4
25
°
C 42 200
36
150
U
n
i
ts
V
mV
R
ipple
r
ej
e
c
t
ion
V
I
=
-
11V
t
o
-
21V,
f
=
120
H
z
25
°
C
37
46
dB
Output regulation I
O
= 1mA to
100mA
I
O
= 1mA to
40mA
25
°
C
30
100
15
50
mV
Output noise voltage f= 10Hz to 100 KHz 25
°
C 54
µ
V
Dropout voltage 25
°
C 1.7
V
Bias
cur
r
ent
25
°
C
6
125
°
C
5
.
5
mA
Bias current change V
I
= -11V to -
23V
I
O
= 1mA to
40mA
0
°
C
t
o
125
°
C
1
.
5
0
.
1
3
BE
IJI
N
G
ES
T
E
K
ELE
CTR
O
N
I
C
S C
O
.,
L
T
D
L
XX
Elec
t
rical
C
h
aracteris
t
ics
79
L
12A
Elec
t
ri
c
al
c
h
arac
t
e
r
is
t
ics
at
sp
e
ci
f
i
e
d
vir
t
u
a
l
j
u
nc
t
i
o
n
t
empe
r
a
t
ure,
V
I
=
-
19V,
I
O
=
40mA
(un
l
ess
o
t
her
w
ise
n
o
t
ed)
P
a
r
am
e
ter
T
e
s
t
c
o
n
d
i
t
i
o
ns*
O
u
t
put
vol
t
a
ge
*
*
79L12A
Min Typ Max
25
°
C
-
11
.
5
-
1
2
-
12
.
5
U
n
i
ts
V
I
nput
re
g
ula
t
ion
I
O
=
1mA
t
o
40mA,
V
I
=
-
14
.
5V
t
o
-
27V
I
O
= 1mA to 70mA
V
I
= -14.5V to -27V
V
I
= -16V to -27V
0
°
C
t
o
125
°
C
25
°
C
-
11
.
4
-
12
.
6
-11.4 -12.6
50 250
40
200
mV
R
ipple
r
ej
e
c
t
ion
V
I
=
-
15V
t
o
-
25V,
f
=
120
H
z
0
°
C
t
o
125
°
C
37
42
dB
Output regulation I
O
= 1mA to
100mA
I
O
= 1mA to 40mA
25
°
C
24
100
15
50
mV
Output noise voltage f= 10Hz to 100 KHz 25
°
C 80
µ
V Dropout voltage 25
°
C 1.7
V Bias current 25
°
C
6.5
125
°
C
6
mA
Bias current change V
I
= -16V to -
27V
I
O
= 1mA to
40mA
0
°
C
t
o
125
°
C
1
.
5
0
.
1
* Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal
effects must be taken into account separately. All characteristics are measured with a 0.33
µ
F capacitor across the input and a 0.1
µ
F
capacitor across the output.
**
T
his
s
pe
c
i
f
ica
t
i
on
a
pp
l
ies
o
nl
y
f
or
dc
po
w
er
dis
s
i
p
a
t
ion
per
m
i
tt
ed
by
abs
o
lu
t
e
m
a
xim
u
m
ra
t
i
n
gs.
Elec
t
rical
C
h
aracteris
t
ics
79
L
15A
Elec
t
ri
c
al
c
h
arac
t
e
r
is
t
ics
at
sp
e
ci
f
i
e
d
vir
t
u
a
l
j
u
nc
t
i
o
n
t
empe
r
a
t
ure,
V
I
=
-
23V,
I
O
=
40mA
(un
l
ess
o
t
her
w
ise
n
o
t
ed)
P
a
r
am
e
ter
T
e
s
t
c
o
n
d
i
t
i
o
ns*
O
u
t
put
vol
t
a
ge
*
*
79L15A
Min Typ Max
25
°
C
-
14
.
4
-
1
5
-
15
.
6
U
n
i
ts
V
I
nput
re
g
ula
t
ion
I
O
= 1mA to 40mA, V
I
= -17.5V to -30V
I
O
= 1mA to 70mA
V
I
= -17.5V to -30V
V
I
= -20V to -30V
0
°
C
t
o
125
°
C
25
°
C
-
14
.
25
-
15
.
75
-14.25 -15.75
65 300
50
250
mV
R
ipple
r
ej
e
c
t
ion
V
I
=
-
18
.
5V
t
o
-
28
.
5V,
f
=
120
H
z
0
°
C
t
o
125
°
C
34
39
dB
Output regulation I
O
= 1mA to
100mA
I
O
= 1mA to 40mA
25
°
C
25
150
15
75
mV
Output noise voltage f= 10Hz to 100 KHz 25
°
C 90
µ
V
Dropout voltage 25
°
C 1.7 V
Bias
cur
r
ent
25
°
C
6
.
5
125
°
C
6
mA
Bias current change V
I
= -20V to -
30V
I
O
= 1mA to
40mA
0
°
C
t
o
125
°
C
1
.
5
0
.
1
4
BE
IJI
N
G
ES
T
E
K
ELE
CTR
O
N
I
C
S C
O
.,
L
T
D
L
XX
Elec
t
rical
C
h
aracteris
t
ics
79
L
18A
Elec
t
ri
c
al
c
h
arac
t
e
r
is
t
ics
at
sp
e
ci
f
i
e
d
vir
t
u
a
l
j
u
nc
t
i
o
n
t
empe
r
a
t
ure,
V
I
=
-
26V,
I
O
=
40mA
(un
l
ess
o
t
her
w
ise
n
o
t
ed)
P
a
r
am
e
ter
T
e
s
t
c
o
n
d
i
t
i
o
ns*
O
u
t
put
vol
t
a
ge
*
*
79L18A
Min Typ Max
25
°
C
-
17
.
3
-
1
8
-
18
.
7
U
n
i
ts
V
I
nput
re
g
ula
t
ion
I
O
= 1mA to
40mA,
V
I
= -20.5V to -
33V
I
O
= 1mA to
70mA
V
I
= -20.5V to -
33V
V
I
= -21V to -33V
0
°
C
t
o
125
°
C
25
°
C
-
17
.
1
-
18
.
9
-17.1 -18.9
70 325
60
275
mV
R
ipple
r
ej
e
c
t
ion
V
I
=
-
23V
t
o
-
33V,
f
=
120
H
z
0
°
C
t
o
125
°
C
33
48
dB
Output regulation I
O
= 1mA to
100mA
I
O
= 1mA to 40mA
25
°
C
27
170
19
85
mV
Output noise voltage f= 10Hz to 100 KHz 25
°
C 150
µ
V
Dropout voltage 25
°
C 1.7 V
Bias
cur
r
ent
25
°
C
6
.
5
125
°
C
6
mA
Bias current change V
I
= -21V to -
33V
I
O
= 1mA to
40mA
0
°
C
t
o
125
°
C
1
.
5
0
.
1
* Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal
effects must be taken into account separately. All characteristics are measured with a 0.33
µ
F capacitor across the input and a 0.1
µ
F
capacitor across the output.
**
T
his
s
pe
c
i
f
ica
t
i
on
a
pp
l
ies
o
nl
y
f
or
dc
po
w
er
dis
s
i
p
a
t
ion
per
m
i
tt
ed
by
abs
o
lu
t
e
m
a
xim
u
m
ra
t
i
n
gs.
Elec
t
rical
C
h
aracteris
t
ics
79
L
24A
Elec
t
ri
c
al
c
h
arac
t
e
r
is
t
ics
at
sp
e
ci
f
i
e
d
vir
t
u
a
l
j
u
nc
t
i
o
n
t
empe
r
a
t
ure,
V
I
=
-
33V,
I
O
=
40mA
(un
l
ess
o
t
her
w
ise
n
o
t
ed)
P
a
r
am
e
ter
T
e
s
t
c
o
n
d
i
t
i
o
ns*
O
u
t
put
vol
t
a
ge
*
*
79L24A
Min Typ Max
25
°
C
-
2
3
-
2
4
-
2
5
U
n
i
ts
V
I
nput
re
g
ula
t
ion
I
O
= 1mA to 40mA, V
I
= -27V to -
38V
I
O
= 1mA to 70mA
V
I
= -27V to -38V
V
I
= -28V to -38V
0
°
C
t
o
125
°
C
25
°
C
-
22
.
8
-
25
.
2
-22.8 -25.2
90 350
75
300
mV
R
ipple
r
ej
e
c
t
ion
V
I
=
-
29V
t
o
-
35V,
f
=
120
H
z
0
°
C
t
o
125
°
C
31
47
dB
Output regulation I
O
= 1mA to
100mA
I
O
= 1mA to 40mA
25
°
C
40
200
25
100
mV
Output noise voltage f= 10Hz to 100 KHz 25
°
C 200
µ
V
Dropout voltage 25
°
C 1.7 V
Bias
cur
r
ent
25
°
C
6
.
5
125
°
C
6
mA
Bias current change V
I
= -28V to -
38V
I
O
= 1mA to
40mA
0
°
C
t
o
125
°
C
1
.
5
0
.
1
* Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Therm
al
effects must be taken into account separately. All characteristics are measured with a 0.33
µ
F capacitor across the input and a 0.1
µ
F
capacitor across the output.
**
T
his
s
pe
c
i
f
ica
t
i
on
a
pp
l
ies
o
nl
y
f
or
dc
po
w
er
dis
s
i
p
a
t
ion
per
m
i
tt
ed
by
abs
o
lu
t
e
m
a
xim
u
m
ra
t
i
n
gs.
5
BE
IJI
N
G
ES
T
E
K
ELE
CTR
O
N
I
C
S C
O
.,
L
T
D
L
XX
Or
d
e
ri
n
g I
n
f
o
rm
a
ti
o
n
O
R
D
E
R
I
NG
NU
M
B
E
R
P
A
C
K
A
G
E
M
AR
K
I
NG
79LXX
TO
-
9
2
ET79LXX
A
d
dr
e
ss
:
6A06--6A07
Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
Postalcode:100039
Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Fax : 010-58895793
Http://www.estek.com.cn
E
m
a
il
:s
a
l
e
s@
e
st
e
k.c
o
m.
c
n
R
E
V
N
o
:
01
-
0
6
08
06
7
BE
IJI
N
G
ES
T
E
K
ELE
CTR
O
N
I
C
S C
O
.,
L
T
D