®
SPX3819
500mA, Low-Noise LDO Voltage Regulator
FEATURES
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Low Noise: 40µV Possible
High Accuracy: 1%
Reverse Battery Protection
Low Dropout: 340mV at Full Load
Low Quiescent Current: 90µA
Zero Off-Mode Current
Fixed Output: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V,
3.1V, 3.3V, 5.0V
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5 Pin SOT-23, 8 Pin nSOIC and 8 pin 2X3 DFN
Packages.
Battery Powered Systems
Cordless Phones
Radio Control Systems
Portable/Palm Top/Notebook Computers
Portable Consumer Equipment
Portable Instrumentation
Bar Code Scanners
SMPS Post Regulators
EN
NC
V
IN
1
2
3
4
8
ADJ/BYP
GND
NC
V
OUT
SPX3819
7
8 Pin DFN
6
5
NC
APPLICATIONS
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Now Available in Lead Free Packaging
DESCRIPTION
The SPX3819 is a positive voltage regulator with a low dropout voltage and low noise output. In addition,
this device offers a very low ground current of 800µA at 100mA output. The SPX3819 has an initial tolerance
of less than 1% max and a logic compatible ON/OFF switched input. When disabled power consumption
drop to nearly zero. Other key features include reverse battery protection, current limit, and thermal
shutdown. The SPX3819 includes a reference bypass pin for optimal low noise output performance. With
its very low output temperature coefficient, this device also makes a superior low power voltage reference.
The SPX3819 is an excellent choice for use in battery-powered applications such as cordless telephones,
radio control systems, and portable computers. It is available in several fixed voltages 1.2V, 1.5V, 1.8V,
2.5V, 3.0V, 3.1V, 3.3V, 5.0V or with an adjustable output. This device is offered in 8 pin nSOIC, 8 pin DFN
and 5-pin SOT-23 packages.
TYPICAL APPLICATION CIRCUIT
V
IN
1
5
V
OUT
+
2
+
GND
3
EN
ENABLE may be tied directly to V
IN
SPX3819
4
BYP
(Opt.)
TOP View
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
© Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation ...................................................... Internally Limited
Lead Temp. (Soldering, 5 Seconds) ........................................... 260°C
Operating Junction Temperature Range ................... -40°C to +125°C
Input Supply Voltage ........................................................ -20V to +20V
Enable Input Voltage ........................................................ -20V to +20V
RECOMMENDED OPERATIONG CONDITIONS
Input Voltage ................................................................... +2.5V to+16V
Operating Junction Temperature Range ................... -40°C to +125°C
Enable Input Voltage .............................................................. 0V to V
IN
ELECTRICAL CHARACTERISTICS
T
J
=25°C, V
OUT
+ 1V, for 1.2V Option V
IN
=V
OUT
+ 1.2V I
L
=100µA, C
L
=1µF, and V
ENABLE
≥
2.4V. The
♦
denotes the
specifications which apply over full operating temperature range -40°C to +85°C, unless otherwise specified.
PARAMETER
Output Voltage Tolerance
Output Voltage Temperature Coef.
Line Regulation
Load Regulation
Dropout Voltage
(V
IN
-V
O
)(Note 2)
MIN
-1
-2
57
0.04
0.05
10
125
180
340
Quiescent Current (I
GND
)
Ground Pin Current (I
GND
)
0.05
90
250
1.0
6.5
Ripple Rejection (PSRR)
Current Limit (I
LIMIT
)
Output Noise (e
NO
)
70
800
950
300
40
Input Voltage Level Logic Low (V
IL
)
Input Voltage Level Logic High (V
IH
)
ENABLE Input Current
Thermal Resistance (Note 1)
2
0.01
3
220
180
2
20
0.4
µV
RMS
µV
RMS
V
V
µA
°C/W
°C/W
♦
♦
0.1
0.4
60
80
175
250
350
450
550
700
3
8
150
190
650
900
2.0
2.5
25.0
30.0
TYP
MAX
+1
+2
UNITS
%
♦
ppm/°C
%/V
%
mV
♦
mV
♦
mV
♦
mV
♦
µA
♦
µA
♦
µA
♦
mA
♦
mA
♦
dB
mA
♦
I
L
=10mA, C
L
=1.0µF, C
IN
=1µF,
(10Hz-100kHz)
I
L
=10mA, C
L
=10µF, C
BYP
=1µF,
C
IN
=1µF, (10Hz-100kHz)
OFF
ON
V
IL
≤
0.4V
V
IH
≥
2.0V
SOT-23-5 / Junction to Ambient
SO-8 / Junction to Ambient
V
OUT
= 0V
I
L
= 500mA
I
L
= 150mA
I
L
= 50mA
V
ENABLE
≤
0.4V
V
ENABLE
≤
0.25V
I
L
= 100µA
IL = 500mA
I
L
= 150mA
I
L
= 50mA
V
IN
=V
OUT
+ 1V to 16V
I
L
= 0.1mA to 500mA
I
L
= 100µA
♦
CONDITIONS
NOTES
Note 1:
The maximum allowable power dissipation is a function of maximum operating junction temperature, T
J(max)
the junction to ambient thermal
resistance, and the ambient
θ
JA
, and the ambient temperature T
A
. The maximum allowable power dissipation at any ambient temperature is
given: P
D(max)
= (T
J(max)
-T
A
)/θ
JA
, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will
go into thermal shutdown. The
θ
JA
of the SPX3819 is 220°C/W mounted on a PC board.
Note 2:
Not applicable to output voltage 2V or less.
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
© Copyright 2004 Sipex Corporation
2
TYPICAL PERFORMANCE CHARACTERISTICS
7.0
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
160
150
140
130
6.0
5.0
I
GND
(mA)
I
GND
(µA)
4.0
120
110
100
90
80
3.3V Device
C
L
= 1.0µF
I
L
= 100µA
3.0
2.0
1.0
70
0.0
0
100
200
300
400
500
60
4
6
8
10
12
14
16
I
L
(mA)
V
IN
(V)
Ground Current vs Load Current
Ground Current vs Input Voltage
14.0
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
3.350
3.345
3.340
3.335
3.330
12.0
10.0
I
GND
(mA)
V
OUT
(V)
8.0
3.325
3.320
3.315
3.310
3.3V Device
C
L
= 1.0µF
I
L
= 100µA
6.0
4.0
3.305
3.300
2.0
3.295
3.290
0.0
0
100
200
300
400
500
4
6
8
10
12
14
16
I
L
(mA)
V
IN
(V)
Ground Current vs Load Current in Dropout
Output Voltage vs Input Voltage
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
© Copyright 2004 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
350
300
3.3V Device
V
IN
= 3.2V
C
L
= 1.0µF
3.316
3.314
3.312
3.310
Dropout (mV)
250
200
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
V
OUT
(V)
3.308
3.306
3.304
150
100
50
3.302
0
0
100
200
300
400
500
3.300
0
100
200
300
400
500
I
L
(mA)
Dropout Voltage vs Load Current
I
L
(mA)
Output Voltage vs Load Current
130
3.3V Device
V
IN
= 4.3µF
C
L
= 1.0µF
I
L
= 100µA
360
3.3V Device
V
IN
= 4.3
C
L
= 1.0µF
I
L
= 50mA
120
340
320
110
I
GND
(µA)
300
100
I
GND
(µA)
280
260
90
240
80
220
70
-40
-20
0
20
40
60
80
100
120
200
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Ground Current vs Temperature with 100µA Load
Ground Current vs Temperature with 50mA Load
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
© Copyright 2004 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
8.0
14.0
3.3V Device
V
IN
= 4.3µF
C
L
= 1.0µF
I
L
= 500mA
7.5
3.3V Device
V
IN
= 4.3µF
C
L
= 1.0µF
I
L
= 500mA
13.5
13.0
I
GND
(mA)
-40
-20
0
20
40
60
80
100
120
I
GND
(mA)
12.5
7.0
12.0
11.5
6.5
11.0
6.0
10.5
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Ground Current vs Temperature with 500mA Load
Ground Current vs Temperature in Dropout
1.30
3.3V Device
C
L
= 1.0µF
I
L
= 100µA
3.400
3.380
3.360
3.340
3.3V Device
V
IN
= 4.3µF
C
L
= 1.0µF
I
L
= 500mA
1.25
V
EN,
On Threshold (V)
1.20
V
OUT
(V)
3.320
3.300
2.280
1.15
1.10
2.260
2.240
1.05
2.220
1.00
4
6
8
10
12
14
16
2.200
-40
-20
0
20
40
60
80
100
120
V
IN
(V)
Temperature (°C)
ENABLE Voltage, ON threshold, vs Input Voltage
Output Voltage vs Temperature
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
© Copyright 2004 Sipex Corporation
5
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