SGS Thomson Microelectronics L4940V12, L4940V10, L4940D2T85, L4940D2T5, L4940D2T12 Datasheet
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VERY LOW DROP 1.5 A REGULATORS
■ PRECISE5V, 8.5V, 10 V,12 V OUTPUTS
■ LOWDROPOUTVOLTAGE(500mV typ
at1.5A)
■ VERYLOW QUIESCENTCURRENT
■ THERMAL SHUTDOWN
■ SHORTCIRCUITPROTECTION
■ REVERSEPOLARITYPROTECTION
DESCRIPTION
The L4940 series of three terminal positive
regulators is available in TO-220 and D
package 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,
thermalshut-down and safe area protection.
2
PAK
TO-220
L4940 series
2
PAK
D
TO-263
BLOCKDIAGRAM
November 1999
1/13
L4940 series
PIN CONNECTION AND ORDER CODES
ORDERING NUMBERS OUTPUT VOLTAGE
TO-220 D
L4940V5 L4940D2T 5 5V
L4940V85 L4940D2 T 85 8.5V
L4940V10 L4940D2 T 10 10V
L4940V12 L4940D2 T 12 12V
ABSOLUTE MAXIMUM RATING
2
PAK
Symbol Description Values Unit
V
ForwardInput Voltage 30 V
I
V
P
T
j,Tstg
Reverse Input Voltage
IR
OutputCurrent Internally Limited
I
O
PowerDissipation Internally Limited
tot
=5V RO=100
V
O
V
=8.5V RO= 180
O
=10V RO= 200
V
O
=12V RO= 240
V
O
Ω
Ω
Ω
Ω
Junctionand StorageTemperature -40 to 150
-15 V
THERMALDATA
Symbol Description Value Unit
2
PAK
3
62.5
o
o
R
thj-cas e
R
thj-amb
Thermal ResistanceJunction-case Max
Thermal ResistanceJunction-ambient Max
TO-220 D
3
50
o
C
C/W
C/W
2/13
TESTCIRCUITS
Figure1 : DC Parameter.
L4940 series
Figure2 :
Load Rejection.
Figure3 : Ripple Rejection.
3/13
L4940 series
ELECTRICAL CHARACTERISTICS FOR L4940V5
= 7V, Ci=0.1 µF, Co=22µF unless otherwisespecified)
V
i
(refer to the test circuits, T
=25oC,
j
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
OutputVoltage Io=500 mA 4.9 5 5.1 V
o
V
OutputVoltage Io=5 mA to 1500 mA
o
OperatingInput Voltage Io=5 mA 17 V
V
i
LineRegulation Io=5 mA Vi= 6 to 17V 4 10 mV
V
∆
o
LoadRegulation Io=5 to 1500 mA
V
∆
o
I
Quiescent Current Io=5mA
Q
Quiescent CurrentChange Io=5mA
I
∆
Q
OutputVoltageDrift 0.5 mV/oC
V
∆
o
∆
T
SVR Supply Voltage Rejection I
V
Dropout Voltage Io=0.5A
d
I
ShortCircuitCurrent Vi=14V
sc
= 6.5to 16 V
V
i
=500 to 1000 mA
I
o
=1.5A Vi= 6.5V
I
o
=1.5A Vi= 6.5to 16 V
I
o
=1 A f = 120 Hz 58 68 dB
o
=1.5A
I
o
= 6.5V
V
i
4.855.2V
8
5
5
30
25
15
8
50
3
15
200
500
2
2.2
400
900
2.7
2.9
mV
mA
mA
mV
A
ELECTRICAL CHARACTERISTICS FOR L4940V85(referto the test circuits,Tj=25oC,
= 10.5V,Ci= 0.1 µF, Co=22µF unlessotherwisespecified)
V
i
Symbol Parameter Test Conditions Min. Typ. Max. Unit
V
OutputVoltage Io=500 mA 8.3 8.5 8.7 V
o
V
OutputVoltage Io=5 mA to 1500 mA
o
OperatingInput Voltage Io=5 mA 17 V
V
i
LineRegulation Io=5 mA Vi= 9.5to 17 V 4 9 mV
V
∆
o
∆V
LoadRegulation Io=5 to 1500 mA
o
I
Quiescent Current Io=5mA
Q
Quiescent CurrentChange Io=5mA
I
∆
Q
OutputVoltageDrift 0.8 mV/oC
V
∆
o
T
∆
SVR Supply Voltage Rejection I
V
Dropout Voltage Io=0.5A
d
I
ShortCircuitCurrent Vi=14V
sc
= 10.2to 16V
V
i
I
=500 to 1000 mA
o
=1.5A Vi= 10.2V
I
o
=1.5A Vi= 10.2to16 V
I
o
=1 A f = 120 Hz 58 66 dB
o
=1.5A
I
o
= 10.2V
V
i
8.15 8.5 8.85 V
12
8
4
30
30
16
8
50
2.5
15
200
500
2
2.2
400
900
2.7
2.9
mV
mA
mA
mV
A
4/13
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