L4940.PDF
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VERY LOW DROP 1.5 A REGULATORS
L4940
SERIES
VERY LOW DROP 1.5 A REGULATORS
PRECISE 5 V, 8.5 V, 10 V, 12 V OUTPUTS
LOW DROPOUT VOLTAGE (500 mV typ at 1.5A)
VERY LOW QUIESCENT CURRENT
THERMAL SHOUTDOWN
SHORT CIRCUIT PROTECTION
REVERSE POLARITY PROTECTION
DESCRIPTION
The L4940 series of three terminal positive regula-
tors is available in TO-220 package and with sev-
eral fixed output voltages, making it useful in a wide
range of industrial and consumer applications.
Thanks to its very low input/output voltage drop,
these devices are particularly suitable for battery
powered equipments, reducing consumption and
prolonging battery life. Each type employs internal
current limiting, antisaturation circuit, thermal shut-
down and safe area protection.
TO-220
APPLICATION CIRCUIT
February 1993
1/12
L4940 Series
PIN CONNECTION AND ORDER CODES
ORDERING NUMBERS
OUTPUT VOLTAGE
L4940V5
5V
L4940V85
8.5V
L4940V10
10V
L4940V12
12V
ABSOLUTE MAXIMUM RATING
Symbol
Description
Values
Unit
V
I
Forward Input Voltage
30
V
V
IR
Reverse Input Voltage
V
O
=5V
R
O
= 100
W
-15
V
V
O
= 8.5 V
R
O
= 180
W
V
O
=10V
R
O
= 200
W
V
O
=12V
R
O
= 240
W
I
O
Output Current
Internally Limited
P
to t
Power Dissipation
Internally Limited
T
j
,T
stg
Junction and Storage Temperature
-40 to 150
C
THERMAL DATA
Symbol
Description
Value
Unit
R
th-j-case
Thermal Resistance Junction-case
Max
3
°
C/W
R
th-j-amb
Thermal Resistance Junction-ambient
Max
50
°
C/W
TEST CIRCUITS
Figure 1. - DC Parameters.
2/12
°
L4940 Series
TEST CIRCUITS:
(continued)
Figure 2. - Load Regulation
Figure 3. - Ripple Rejection
3/12
L4940 Series
ELECTRICAL CHARACTERISTICS FOR L4940V5
(refer to the test circuits, T
j
=25
°
C,
V
i
=7V,C
i
= 0.1
m
F, C
o
=22
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 500 mA
4.9
5
5.1
V
V
o
Output Voltage
I
o
= 5 mA to 1500 mA
V
i
= 6.5 to 16 V
4.8
5
5.2
V
V
i
Operating Input Voltage
I
o
= 5 mA
17
V
D
V
o
Line Regulation
I
o
= 5 mA V
i
= 6 to 17 V
4
10
mV
D
V
o
Load Regulation
I
o
= 5 to 1500 mA
I
o
= 500 to 1000 mA
8
5
25
15
mV
I
Q
Quiscent Current
I
o
=5mA
I
o
= 1.5 A V
i
= 6.5 V
5
30
8
50
mA
D
I
Q
Quiscent Current Change
I
o
=5mA
I
o
= 1.5 A V
i
= 6.5 to 16 V
3
15
mA
D
V
o
Output Voltage Drift
0.5
mV/
°
C
D
T
SVR
Supply Voltage Rejection
I
o
= 1 A
f = 120 Hz
58
68
dB
V
d
Dropout Voltage
I
o
= 0.5 A
I
o
= 1.5 A
200
500
400
900
mV
I
sc
Short Circuit Current
V
i
=14V
V
i
= 6.5 V
2
2.2
2.7
2.9
A
Z
o
Output Impedance
f = 1 KHz I
o
= 0.5A
30
m
W
e
N
Output Noise Voltage
B = 100 Hz to 100 KHz
30
m
V/V
o
ELECTRICAL CHARACTERISTICS FOR L4940V85
(refer to the test circuits, T
j
=25
°
C,
V
i
= 10.5V, C
i
= 0.1
m
F, C
o
=22
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 500 mA
8.3
8.5
8.7
V
V
o
Output Voltage
I
o
= 5 mA to 1500 mA
V
i
= 10.2 to 16 V
8.15
8.5
8.85
V
V
i
Operating Input Voltage
I
o
= 5 mA
17
V
D
V
o
Line Regulation
I
o
= 5 mA V
i
= 9.5 to 17 V
4
9
mV
D
V
o
Load Regulation
I
o
= 5 to 1500 mA
I
o
= 500 to 1000 mA
12
8
30
16
mV
I
Q
Quiscent Current
I
o
=5mA
I
o
= 1.5 A V
i
= 10.2 V
4
30
8
50
mA
D
I
Q
Quiscent Current Change
I
o
=5mA
I
o
= 1.5 A V
i
= 10.2 to 16 V
2.5
15
mA
D
V
o
Output Voltage Drift
0.8
mV/
°
C
D
T
SVR
Supply Voltage Rejection
I
o
= 1 A f = 120 Hz
58
66
dB
V
d
Dropout Voltage
I
o
= 0.5 A
I
o
= 1.5 A
200
500
400
900
mV
I
sc
Short Circuit Current
V
i
=14V
V
i
= 10.2 V
2
2.2
2.7
2.9
A
Z
o
Output Impedance
f = 1 KHz I
o
= 0.5A
32
m
W
e
N
Output Noise Voltage
B = 100 Hz to 100 KHz
30
m
V/V
o
4/12
L4940 Series
ELECTRICAL CHARACTERISTICS FOR L4940V10
(refer to the test circuits, T
j
=25
°
C,
V
i
= 12V, C
i
= 0.1
F, C
o
=22
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 500 mV
9.8
10
10.2
V
V
o
Output Voltage
I
o
= 5 mA to 1500 mA
V
i
= 11.7 to 16 V
9.6
10
10.4
V
V
i
Operating Input Voltage
I
o
= 5 mA
17
V
D
V
o
Line Regulation
I
o
= 5 mA V
i
=11to17V
3
8
mV
D
V
o
Load Regulation
I
o
= 5 to 1500 mA
I
o
= 500 to 1000 mA
15
10
35
20
mV
I
Q
Quiscent Current
I
o
=5mA
I
o
= 1.5 A V
i
= 11.7 V
4
30
8
50
mA
D
I
Q
Quiscent Current Change
I
o
=5mA
I
o
= 1.5 A V
i
= 11.7 to 16 V
2
13
mA
D
V
o
Output Voltage Drift
1
mV/
°
C
D
T
SVR
Supply Voltage Rejection
I
o
= 1 A
f = 120 Hz
56
62
dB
V
d
Dropout Voltage
I
o
= 0.5 A
I
o
= 1.5 A
200
500
400
900
mV
I
sc
Short Circuit Current
V
i
=14V
V
i
= 11.7 V
2
2.2
2.7
2.9
A
A
Z
o
Output Impedance
f = 1 KHz I
o
= 0.5A
36
m
W
e
N
Output Noise Voltage
B = 100 Hz to 100 KHz
30
m
V/V
o
ELECTRICAL CHARACTERISTICS FOR L4940V12
(refer to the test circuits, T
j
=25
°
C,
V
i
= 14V, C
i
= 0.1
m
F, C
o
=22
m
F unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
o
Output Voltage
I
o
= 500 mV
11.75
12
12.25
V
V
o
Output Voltage
I
o
= 5 mA to 1500 mA
V
i
= 13.8 to 17 V
11.5
12
12.5
V
V
i
Operating Input Voltage
I
o
= 5 mA
17
V
D
V
o
Line Regulation
I
o
= 5 mA V
i
=13to17V
3
7
mV
D
V
o
Load Regulation
I
o
= 5 to 1500 mA
I
o
= 500 to 1000 mA
15
10
35
25
mV
I
Q
Quiscent Current
I
o
=5mA
I
o
= 1.5 A V
i
= 13.8 V
4
30
8
50
mA
D
I
Q
Quiscent Current Change
I
o
=5mA
I
o
= 1.5 A V
i
= 13.8 to 16 V
1.5
10
mA
D
V
o
Output Voltage Drift
1.2
mV/
°
C
D
T
SVR
Supply Voltage Rejection
I
o
= 1 A
f = 120 Hz
55
61
dB
V
d
Dropout Voltage
I
o
= 0.5 A
I
o
= 1.5 A
200
500
400
900
mV
I
sc
Short Circuit Current
V
i
= 14 V
2
2.7
A
Z
o
Output Impedance
f = 1 KHz I
o
= 0.5A
40
m
W
e
N
Output Noise Voltage
B = 100 Hz to 100 KHz
30
m
V/V
o
5/12
m
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