SPX3819
500mA, Low-Noise LDO Voltage Regulator
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FEATURES
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. Adj. Output also available.
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Available in RoHS Compliant, Lead Free
Packages: 5 Pin SOT-23, 8 Pin Narrow
SOIC and 8 pin 2X3 DFN
EN
NC
VIN
NC
1
2
3
4
8
ADJ/BYP
GND
NC
VOUT
SPX3819
8 Pin DFN
7
6
5
APPLICATIONS
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Battery Powered Systems
Cordless Phones
Radio Control Systems
Portable/Palm Top/Notebook Computers
Portable Consumer Equipment
Portable Instrumentation
Bar Code Scanners
SMPS Post Regulators
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 drops 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
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2007 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 OPERATING CONDITIONS
Input Voltage ................................................................... +2.5V to+16V
Operating Junction Temperature Range ................... -40°C to +125°C
Enable Input Voltage ........................................................... 0.0V 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
191
128.4
59
2
20
0.4
µV
RMS
µV
RMS
V
V
µA
°C/W
°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
NSOIC-8 / Junction to Ambient
DFN-8 / Junction to Ambient
V
OUT
= 0.0V
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.
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2007 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)
4.0
120
100
3.0
I
GND
(
µ
A)
90
80
70
60
4
3.3V Device
C
L
= 1.0µF
I
L
= 100µA
2.0
1.0
0.0
0
100
200
300
400
500
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
6.0
4.0
3.305
3.300
3.3V Device
C
L
= 1.0µF
I
L
= 100µA
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
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2007 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
350
300
3.3V Device
C
L
= 1.0µF
3.316
3.314
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
Dropout (mV)
250
200
3.312
3.310
V
OUT
(V)
3.308
3.306
150
100
3.304
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
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2007 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
1.25
3.400
3.380
3.360
3.340
3.3V Device
V
IN
= 4.3µF
C
L
= 1.0µF
I
L
= 500mA
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
2.200
4
6
8
10
12
14
16
1.00
-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
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
© 2007 Sipex Corporation
5
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