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February 2003
s
PRECISE 5, 8.5, 10, 12V OUTPUTS
s
LOW DROPOUT VOLTAGE (500mV Typ. at
1.5A)
s
VERY LOW QUIESCENT CURRENT
s
THERMAL SHUTDOWN
s
SHORT CIRCUIT PROTECTION
s
REVERSE POLARITY PROTECTION
DESCRIPTION
The L4940 series of three terminal positive
regulators is available in TO-220, TO-220FP and
D
2
PAK packages and with several 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.
L4940
SERIES
VERY LOW DROP 1.5A REGULATORS
BLOCK DIAGRAM
TO-220
D
2
PAK
TO-220FP
L4940 SERIES
2/16
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
CONNECTION DIAGRAM (top view)
ORDERING CODES
(*) Available in Tape & Reel with the suffix "-TR".
Symbol
Parameter
Value
Unit
V
I
Forward Input Voltage
30
V
V
IR
Reverse Input Voltage
V
O
=5V
R
O
=100
-15
V
V
O
=8.5V R
O
=180
-15
V
V
O
=10V
R
O
=200
-15
V
V
O
=12V
R
O
=240
-15
V
I
O
Output Current
Internally Limited
mA
P
D
Power Dissipation
Internally Limited
mW
T
stg
Storage Temperature Range
-40 to +150
C
T
op
Operating Junction Temperature Range
-40 to +150
C
Symbol
Parameter
TO-220
TO-220FP
D
2
PAK
Unit
R
thj-case
Thermal Resistance Junction-case
3
5
3
C/W
R
thj-amb
Thermal Resistance Junction-ambient
50
60
62.5
C/W
TO-220
TO-220FP
D
2
PAK
TO-220
TO-220FP
D
2
PAK (*)
OUTPUT VOLTAGE
L4940V5
L4940P5
L4940D2T5
5 V
L4940V85
L4940P85
L4940D2T85
8.5 V
L4940V10
L4940P10
L4940D2T10
10 V
L4940V12
L4940P12
L4940D2T12
12 V
L4940 SERIES
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TEST CIRCUITS
Figure 1 : DC Parameter
Figure 2 : Load Rejection
Figure 3 : Ripple Rejection
L4940 SERIES
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ELECTRICAL CHARACTERISTICS OF L4940V5 (Refer to test circuit, V
I
=7V, C
I
= 0.1
F, C
O
= 22
F,
T
J
= 25C, unless otherwise specified.)
ELECTRICAL CHARACTERISTICS OF L4940V85 (Refer to test circuit, V
I
=10.5V, C
I
= 0.1
F,
C
O
= 22
F,T
J
= 25C, 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
= 5mA to 1.5A
V
I
= 6.5 to 15V
4.8
5
5.2
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 6 to 17V
I
O
= 5 mA
4
10
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
8
25
mV
I
O
= 0.5A to 1A
5
15
mV
I
q
Quiescent Current
I
O
= 5 mA
5
8
mA
I
O
= 1.5A
V
I
= 6.5V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
3
mA
I
O
= 1.5A
V
I
= 6.5 to 16V
15
mA
V
O
/
T Output Voltage Drift
0.5
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
58
68
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
V
I
= 6.5V
2.2
2.9
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
= 5mA to 1.5A
V
I
= 10.2 to 16V
8.15
8.5
8.85
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 9.5 to 17V
I
O
= 5 mA
4
9
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
12
30
mV
I
O
= 0.5A to 1A
8
16
mV
I
q
Quiescent Current
I
O
= 5 mA
4
8
mA
I
O
= 1.5A
V
I
= 10.2V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
2.5
mA
I
O
= 1.5A
V
I
= 10.2 to 16V
15
mA
V
O
/
T Output Voltage Drift
0.8
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
58
66
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
V
I
= 10.2V
2.2
2.9
L4940 SERIES
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ELECTRICAL CHARACTERISTICS OF L4940V10 (Refer to test circuit, V
I
=12V, C
I
= 0.1
F,
C
O
= 22
F, T
J
= 25C, unless otherwise specified.)
ELECTRICAL CHARACTERISTICS OF L4940V12 (Refer to test circuit, V
I
=14V, C
I
= 0.1
F,
C
O
= 22
F, T
J
= 25C, unless otherwise specified.)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 500 mA
9.8
10
10.2
V
V
O
Output Voltage
I
O
= 5mA to 1.5A
V
I
= 11.7 to 15V
9.6
10
10.4
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 11 to 17V
I
O
= 5 mA
3
8
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
15
35
mV
I
O
= 0.5A to 1A
10
20
mV
I
q
Quiescent Current
I
O
= 5 mA
5
8
mA
I
O
= 1.5A
V
I
= 11.7V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
2
mA
I
O
= 1.5A
V
I
= 11.7 to 16V
13
mA
V
O
/
T Output Voltage Drift
1
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
56
62
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
V
I
= 11.7V
2.2
2.9
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 500 mA
11.75
12
12.25
V
V
O
Output Voltage
I
O
= 5mA to 1.5A
V
I
= 13.8 to 15V
11.5
12
12.5
V
V
I
Input Voltage
I
O
= 5 mA
17
V
V
O
Line Regulation
V
I
= 13 to 17V
I
O
= 5 mA
3
7
mV
V
O
Load Regulation
I
O
= 5mA to 1.5A
15
35
mV
I
O
= 0.5A to 1A
10
25
mV
I
q
Quiescent Current
I
O
= 5 mA
4
8
mA
I
O
= 1.5A
V
I
= 13.8V
30
50
mA
I
q
Quiescent Current Change
I
O
= 5 mA
1.5
mA
I
O
= 1.5A
V
I
= 13.8 to 16V
10
mA
V
O
/
T Output Voltage Drift
1.2
mv/C
SVR
Supply Voltage Rejection
f = 120Hz
I
O
= 1A
55
61
dB
V
d
Dropout Voltage
I
O
= 0.5A
200
400
mV
I
O
= 1.5A
500
900
mV
I
sc
Short Circuit Current
V
I
= 14V
2
2.7
A
Z
O
Output Impedance
f = 120Hz
I
O
= 0.5A
40
m
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