L4931
SERIES
VERY LOW DROP
VOLTAGE REGULATORS WITH INHIBIT
April 1999
s
VERY LOW DROPOUT VOLTAGE (0.4V)
s
VERY LOW QUIESCENT CURRENT
(TYP. 50
µ
A IN OFF MODE, 600
µ
A IN ON
MODE)
s
OUTPUT CURRENT UP TO 250 mA
s
LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
s
OUTPUT VOLTAGES OF 1.25; 1.5; 2.5; 2.7;
3; 3.3; 3.5; 4; 4.5; 4.7; 5; 5.2; 5.5; 6; 8; 12V
s
INTERNAL CURRENT AND THERMAL LIMIT
s
ONLY 2.2
µ
F FOR STABILITY
s
AVAILABLE IN
±
1% (AB) OR 2% (C)
SELECTION AT 25
o
C
s
SUPPLY VOLTAGE REJECTION:
70db TYP. FOR 5V VERSION
s
TEMPERATURE RANGE: -40 TO 125
o
C
DESCRIPTION
The L4931 series are very Low Drop regulators
available in TO-220, SO-8, DPAK, PPAK and
TO-92 packages and in a wide range of output
voltages.
The very Low Drop voltage (0.4V) and the very
low quiescent current make them particularly
suitable for Low Noise, Low Power applications
and specially in battery powered systems.
In PPAK and SO-8 packages a Shutdown Logic
Control function is available TTL compatible. This
means that when the device is used as a local
regulator, it is possible to put a part of the board
in
standby,
decreasing
the
total
power
consumption. It requires only a 2.2
µ
F capacitor
for stability allowing space and cost saving.
SCHEMATIC DIAGRAM
PPAK
1
3
DPAK
TO-220
SO-8
®
TO-92
1/25
ABSOLUTE MAXIMUM RATINGS
Symbo l
Parameter
Valu e
Un it
V
i
DC Input Voltage
20
V
I
o
Output Current
I nternally limited
P
tot
Power Dissipation
I nternally limited
T
st g
Storage Temperature Range
- 40 to 150
o
C
T
op
Operating Junction Temperature Range
- 40 to 125
o
C
CONNECTION DIAGRAM (top view)
THERMAL DATA
Symbo l
Parameter
TO-220
SO -8
DPAK
PPAK
TO-92
Un it
R
thj- ca se
R
thj- amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
3
50
20
55(*)
8
100
8
100
200
o
C/W
o
C/W
(*) Considering 6 cm
2
of copper board heat-sink
TO-220
SO-8
PPAK
DPAK
TO-92
pin 1 = V
OUT
pin 2 = GND
pin 3 = V
IN
BOTTOM VIEW
L4931 SERIES
2/25
ELECTRICAL CHARACTERISTICS FOR L4931ABxx12 (refer to the test circuits, T
j
= 25
o
C,
C
i
= 0.1
µ
F, C
o
= 2.2
µ
F unless otherwise specified)
Symbo l
Parameter
T est Cond ition s
Mi n.
Typ .
Max.
Unit
V
o
Output Voltage
I
o
= 5 mA, V
i
= 3.3 V
I
o
= 5 mA, V
i
= 3.3 V -25<T
a
<85
o
C
1.238
1.225
1.25
1. 263
1. 275
V
V
V
i
Operating Input Voltage
I
o
= 250 mA
2.5
20
V
I
o ut
Output Current Limit
300
mA
∆
V
o
Line Regulation
V
i
= 2.5 to 20 V,
I
o
= 0.5 mA
3
15
mV
∆
V
o
(*)
Load Regulation
V
i
= 2.7 V
I
o
= 0.5 to 250 mA
3
15
mV
I
d
Quiescent Current
ON MODE
V
i
= 2.7 to 20 V I
o
= 0 mA
V
i
= 2.7 to 20 V I
o
= 250 mA
0.6
4
1
6
mA
mA
OFF MODE V
i
= 6 V
50
100
µ
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 3.7 V
±
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
80
77
55
dB
dB
dB
eN
Output Noise Voltage
B = 10 Hz to 100 KHz
50
µ
V
V
d
(*)
Dropout Voltage
I
o
= 250 mA
1.25
V
V
il
Control Input Logic Low
-40 < T
a
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
a
< 125
o
C
2
V
I
i
Control Input Current
V
i
= 6 V,
V
c
= 6 V
10
µ
A
C
O
Output Bypass Capacitance
ESR = 0.1 to 10
Ω
I
o
= 0 to 250 mA
2
10
µ
F
ELECTRICAL CHARACTERISTICS FOR L4931Cxx12 (refer to the test circuits, T
j
= 25
o
C,
C
i
= 0.1
µ
F, C
o
= 2.2
µ
F unless otherwise specified)
Symbo l
Parameter
T est Cond ition s
Mi n.
Typ .
Max.
Unit
V
o
Output Voltage
I
o
= 5 mA, V
i
= 3.3 V
I
o
= 5 mA, V
i
= 3.3 V -25<T
a
<85
o
C
1.225
1.2
1.25
1. 275
1.3
V
V
V
i
Operating Input Voltage
I
o
= 250 mA
2.5
20
V
I
o ut
Output Current Limit
300
mA
∆
V
o
Line Regulation
V
i
= 2.5 to 20 V,
I
o
= 0.5 mA
3
18
mV
∆
V
o
(*)
Load Regulation
V
i
= 2.7 V
I
o
= 0.5 to 250 mA
3
18
mV
I
d
Quiescent Current
ON MODE
V
i
= 2.7 to 20 V I
o
= 0 mA
V
i
= 2.7 to 20 V I
o
= 250 mA
0.6
4
1
6
mA
mA
OFF MODE V
i
= 6 V
50
100
µ
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 3.7 V
±
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
80
77
55
dB
dB
dB
eN
Output Noise Voltage
B = 10 Hz to 100 KHz
50
µ
V
V
d
(*)
Dropout Voltage
I
o
= 250 mA
1.25
V
V
il
Control Input Logic Low
-40 < T
a
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
a
< 125
o
C
2
V
I
i
Control Input Current
V
i
= 6 V,
V
c
= 6 V
10
µ
A
C
O
Output Bypass Capacitance
ESR = 0.1 to 10
Ω
I
o
= 0 to 250 mA
2
10
µ
F
(*) For SO-8 package the maximum limit of load regulation and dropout is increased by 20mV
L4931 SERIES
4/25
ELECTRICAL CHARACTERISTICS FOR L4931ABxx15 (refer to the test circuits, T
j
= 25
o
C,
C
i
= 0.1
µ
F, C
o
= 2.2
µ
F unless otherwise specified)
Symbo l
Parameter
T est Cond ition s
Mi n.
Typ .
Max.
Unit
V
o
Output Voltage
I
o
= 5 mA, V
i
= 3.5 V
I
o
= 5 mA, V
i
= 3.5 V -25<T
a
<85
o
C
1.485
1.47
1.5
1. 515
1.53
V
V
V
i
Operating Input Voltage
I
o
= 250 mA
2.5
20
V
I
o ut
Output Current Limit
300
mA
∆
V
o
Line Regulation
V
i
= 2.5 to 20 V,
I
o
= 0.5 mA
3
15
mV
∆
V
o
(*)
Load Regulation
V
i
= 2.7 V
I
o
= 0.5 to 250 mA
3
15
mV
I
d
Quiescent Current
ON MODE
V
i
= 2.7 to 20 V I
o
= 0 mA
V
i
= 2.7 to 20 V I
o
= 250 mA
0.6
4
1
6
mA
mA
OFF MODE V
i
= 6 V
50
100
µ
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 3.7 V
±
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
79
76
55
dB
dB
dB
eN
Output Noise Voltage
B = 10 Hz to 100 KHz
50
µ
V
V
d
(*)
Dropout Voltage
I
o
= 250 mA
1
V
V
il
Control Input Logic Low
-40 < T
a
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
a
< 125
o
C
2
V
I
i
Control Input Current
V
i
= 6 V,
V
c
= 6 V
10
µ
A
C
O
Output Bypass Capacitance
ESR = 0.1 to 10
Ω
I
o
= 0 to 250 mA
2
10
µ
F
ELECTRICAL CHARACTERISTICS FOR L4931Cxx15 (refer to the test circuits, T
j
= 25
o
C,
C
i
= 0.1
µ
F, C
o
= 2.2
µ
F unless otherwise specified)
Symbo l
Parameter
T est Cond ition s
Mi n.
Typ .
Max.
Unit
V
o
Output Voltage
I
o
= 5 mA, V
i
= 3.5 V
I
o
= 5 mA, V
i
= 3.5 V -25<T
a
<85
o
C
1.47
1.44
1.5
1.53
1.56
V
V
V
i
Operating Input Voltage
I
o
= 250 mA
2.5
20
V
I
o ut
Output Current Limit
300
mA
∆
V
o
Line Regulation
V
i
= 2.5 to 20 V,
I
o
= 0.5 mA
3
18
mV
∆
V
o
(*)
Load Regulation
V
i
= 2.7 V
I
o
= 0.5 to 250 mA
3
18
mV
I
d
Quiescent Current
ON MODE
V
i
= 2.7 to 20 V I
o
= 0 mA
V
i
= 2.7 to 20 V I
o
= 250 mA
0.6
4
1
6
mA
mA
OFF MODE V
i
= 6 V
50
100
µ
A
SVR
Supply Voltage Rejection
I
o
= 5 mA V
i
= 3.7 V
±
1V
f = 120 Hz
f = 1 KHz
f = 10 KHz
79
76
55
dB
dB
dB
eN
Output Noise Voltage
B = 10 Hz to 100 KHz
50
µ
V
V
d
(*)
Dropout Voltage
I
o
= 250 mA
1
V
V
il
Control Input Logic Low
-40 < T
a
< 125
o
C
0.8
V
V
ih
Control Input Logic High
-40 < T
a
< 125
o
C
2
V
I
i
Control Input Current
V
i
= 6 V,
V
c
= 6 V
10
µ
A
C
O
Output Bypass Capacitance
ESR = 0.1 to 10
Ω
I
o
= 0 to 250 mA
2
10
µ
F
(*) For SO-8 package the maximum limit of load regulation and dropout is increased by 20mV
L4931 SERIES
5/25
