1
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
500mA, Low-Noise LDO Voltage Regulator
DESCRIPTION
FEATURES
Low Noise: 40V Possible
High Accuracy: 1%
Reverse Battery Protection
Low Dropout: 340mV at Full Load
Low Quiescent Current: 90A
Zero Off-Mode Current
Fixed Output: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V,
3.1V, 3.3V, 5.0V
5 Pin SOT-23, 8 Pin nSOIC and 8 pin 2X3 DFN
Packages.
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 800A 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.
APPLICATIONS
Battery Powered Systems
Cordless Phones
Radio Control Systems
Portable/Palm Top/Notebook Computers
Portable Consumer Equipment
Portable Instrumentation
Bar Code Scanners
SMPS Post Regulators
TYPICAL APPLICATION CIRCUIT
+
+
GND
EN
BYP
(Opt.)
ENABLE may be tied directly to V
IN
SPX3819
1
2
3
4
5
V
IN
V
OUT
TOP View
SPX3819
SPX3819
8 Pin DFN
EN
NC
NC
NC
V
IN
ADJ/BYP
V
OUT
GND
5
6
7
8
1
2
3
4
Now Available in Lead Free Packaging
2
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
Power Dissipation ...................................................... Internally Limited
Lead Temp. (Soldering, 5 Seconds) ........................................... 260C
Operating Junction Temperature Range ................... -40C to +125C
Input Supply Voltage ........................................................ -20V to +20V
Enable Input Voltage ........................................................ -20V to +20V
PARAMETER
MIN
TYP
MAX
UNITS
CONDITIONS
Output Voltage Tolerance
-1
+1
%
-2
+2
Output Voltage Temperature Coef.
57
ppm/C
Line Regulation
0.04
0.1
%/V
V
IN
=V
OUT
+ 1V to 16V
Load Regulation
0.05
0.4
%
I
L
= 0.1mA to 500mA
Dropout Voltage
10
60
mV
I
L
= 100A
(V
IN
-V
O
)(Note 2)
80
125
175
mV
I
L
= 50mA
250
180
350
mV
I
L
= 150mA
450
340
550
mV
IL = 500mA
700
Quiescent Current (I
GND
)
0.05
3
A
V
ENABLE
0.4V
8
V
ENABLE
0.25V
Ground Pin Current (I
GND
)
90
150
A
I
L
= 100A
190
250
650
A
I
L
= 50mA
900
1.0
2.0
mA
I
L
= 150mA
2.5
6.5
25.0
mA
I
L
= 500mA
30.0
Ripple Rejection (PSRR)
70
dB
Current Limit (I
LIMIT
)
800
mA
V
OUT
= 0V
950
Output Noise (e
NO
)
300
V
RMS
I
L
=10mA, C
L
=1.0F, C
IN
=1F,
(10Hz-100kHz)
40
V
RMS
I
L
=10mA, C
L
=10F, C
BYP
=1F,
C
IN
=1F, (10Hz-100kHz)
Input Voltage Level Logic Low (V
IL
)
0.4
V
OFF
Input Voltage Level Logic High (V
IH
)
2
V
ON
ENABLE Input Current
0.01
2
A
V
IL
0.4V
3
20
V
IH
2.0V
Thermal Resistance (Note 1)
220
C/W
SOT-23-5 / Junction to Ambient
180
C/W
SO-8 / Junction to Ambient
ELECTRICAL CHARACTERISTICS
T
J
=25
C, V
OUT
+ 1V, for 1.2V Option V
IN
=V
OUT
+ 1.2V I
L
=100
A, C
L
=1
F, and V
ENABLE
2.4V. The
denotes the
specifications which apply over full operating temperature range -40
C to +85C, unless otherwise specified.
ABSOLUTE MAXIMUM RATINGS
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
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
)/
JA
, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will
go into thermal shutdown. The
JA
of the SPX3819 is 220C/W mounted on a PC board.
Note 2: Not applicable to output voltage 2V or less.
Input Voltage ................................................................... +2.5V to+16V
Operating Junction Temperature Range ................... -40C to +125C
Enable Input Voltage .............................................................. 0V to V
IN
RECOMMENDED OPERATIONG CONDITIONS
3
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
Ground Current vs Load Current
Ground Current vs Input Voltage
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
0
100
200
300
400
500
I
L
(mA)
I
GND
(mA)
3.3V Device
V
IN
= 4.3V
C
L
= 1.0F
160
150
140
130
120
110
100
90
80
70
60
4
6
8
10
12
14
16
V
IN
(V)
I
GND
(
A)
3.3V Device
C
L
= 1.0F
I
L
= 100A
Ground Current vs Load Current in Dropout
Output Voltage vs Input Voltage
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
0
100
200
300
400
500
I
L
(mA)
I
GND
(mA)
3.3V Device
V
IN
= 4.3V
C
L
= 1.0F
3.350
3.345
3.340
3.335
3.330
3.325
3.320
3.315
3.310
3.305
3.300
3.295
3.290
4
6
8
10
12
14
16
V
IN
(V)
V
OUT
(V)
3.3V Device
C
L
= 1.0F
I
L
= 100A
4
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
Dropout Voltage vs Load Current
Output Voltage vs Load Current
Ground Current vs Temperature with 100
A Load
Ground Current vs Temperature with 50mA Load
350
300
250
200
150
100
50
0
0
100
200
300
400
500
I
L
(mA)
Dropout (mV)
3.3V Device
V
IN
= 3.2V
C
L
= 1.0F
3.316
3.314
3.312
3.310
3.308
3.306
3.304
3.302
3.300
0
100
200
300
400
500
I
L
(mA)
V
OUT
(V)
3.3V Device
V
IN
= 4.3V
C
L
= 1.0F
130
120
110
100
90
80
70
-40
-20
0
20
40
60
80
100
120
Temperature (C)
I
GND
(
A)
3.3V Device
V
IN
= 4.3F
C
L
= 1.0F
I
L
= 100A
360
340
320
300
280
260
240
220
200
-40
-20
0
20
40
60
80
100
120
Temperature (C)
I
GND
(
A)
3.3V Device
V
IN
= 4.3
C
L
= 1.0F
I
L
= 50mA
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
5
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
Ground Current vs Temperature with 500mA Load
Ground Current vs Temperature in Dropout
ENABLE Voltage, ON threshold, vs Input Voltage
Output Voltage vs Temperature
8.0
7.5
7.0
6.5
6.0
-40
-20
0
20
40
60
80
100
120
Temperature (C)
I
GND
(mA)
3.3V Device
V
IN
= 4.3F
C
L
= 1.0F
I
L
= 500mA
14.0
13.5
13.0
12.5
12.0
11.5
11.0
10.5
-40
-20
0
20
40
60
80
100
120
Temperature (C)
I
GND
(mA)
3.3V Device
V
IN
= 4.3F
C
L
= 1.0F
I
L
= 500mA
1.30
1.25
1.20
1.15
1.10
1.05
1.00
4
6
8
10
12
14
16
V
IN
(V)
V
EN,
On Threshold
(V)
3.3V Device
C
L
= 1.0F
I
L
= 100A
3.400
3.380
3.360
3.340
3.320
3.300
2.280
2.260
2.240
2.220
2.200
-40
-20
0
20
40
60
80
100
120
Temperature (C)
V
OUT
(V)
3.3V Device
V
IN
= 4.3F
C
L
= 1.0F
I
L
= 500mA
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
6
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
Output Noise vs Bypass Capacitor Value I
L
= 10mA,
10Hz - 100kHz
Line Transient Response for 3.3V Device
Load Transient Response for 3.3V Device
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
0
50
100
150
200
250
300
350
1
10
100
1000
10000
100000 1000000
Bypass Cap (pF)
uV RMS
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
7
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
The SPX3819 requires an output capacitor for
device stability. Its value depends upon the
application circuit. In general, linear regulator
stability decreases with higher output currents.
In applications where the SPX3819 is putting
out less current, a lower output capacitance may
be sufficient. For example, a regulator sourcing
only 10mA, requires approximately half the
capacitance as the same regulator sourcing
150mA.
Bench testing is the best method for determining
the proper type and value of the capacitor since
the high frequency characteristics of electro-
lytic capacitors vary widely, depending on type
and manufacturer. A high quality 2.2
F alumi-
num electrolytic capacitor works in most appli-
cation circuits, but the same stability often can
be obtained with a 1
F tantalum electrolytic.
With the SPX3819 adjustable version, the mini-
mum value of output capacitance is a function of
the output voltage. The value decreases with
higher output voltages, since closed loop gain is
increased.
Typical Applications Circuits
A 10nF capacitor on BYP pin will significantly
reduce output noise but it may be left uncon-
nected if the output noise is not a major concern.
The SPX3819 start-up speed is inversely pro-
portional to the size of the BYP capacitor. Ap-
plications requiring a slow ramp-up of the out-
put voltage should use a larger C
BYP
. However,
if a rapid turn-on is necessary, the BYP capaci-
tor can be omitted.
The SPX3819's internal reference is available
through the BYP pin.
Figure 1 represents a SPX3819 standard appli-
cation circuit. The EN (enable) pin is pulled
high (>2.0V) to enable the regulator.
To disable the regulator, EN < 0.4V.
The SPX3819 in Figure 2 illustrates a typical
adjustable output voltage configuration. Two
resistors (R
1
and R
2
) set the output voltage. The
output voltage is calculated using the formula:
V
OUT
= 1.235V x [ 1 + R
1
/R
2
]
R
2
must be > 10 k
and for best results, R
2
should be between 22 k
and 47k. A capacitor
placed between Adj and ground will provide
improved noise performance.
APPLICATION INFORMATION
+
+
GND
EN
BYP
(Opt.)
ENABLE may be tied directly to V
IN
SPX3819
1
2
3
4
5
V
IN
V
OUT
TOP View
+
+
GND
EN
BYP
(Opt.)
Hi-ON
Lo-OFF
SPX3819
SOT-23
1
2
3
4
5
V
IN
V
OUT
R1
R2
ADJ
TOP View
Figure 1. Standard Application Circuit
Figure 2. Typical Adjustable Output Voltage Configuration
8
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
PACKAGE: PINOUTS
SPX3819
8 Pin DFN
EN
NC
NC
NC
V
IN
ADJ/BYP
V
OUT
GND
5
6
7
8
1
2
3
4
5
4
1
2
3
SPX3819
5 Pin SOT-23
EN
GND
V
IN
ADJ/BYP
V
OUT
1
2
3
4
5
6
7
8
EN
SPX3819
8 Pin nSOIC
ADJ/BYP
GND
VOUT
VIN
GND
GND
GND
PACKAGE: PIN DESCRIPTION
#
n
i
P
C
I
O
S
n
#
n
i
P
N
F
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#
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m
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D
2
3
1
V
N
I
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p
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p
p
u
S
8
-
5
7
2
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3
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V
T
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;
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9
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
PACKAGE: 8 PIN SOIC
SEE VIEW C
1
1.65
DIMENSIONS
Minimum/Maximum
(mm)
8 Pin NSOIC
(JEDEC MS-012,
AA - VARIATION)
COMMON HEIGHT DIMENSION
A
A1
A2
b
c
L
e
E1
E
L2
L1
1.35
4.90 BSC
0.40
0.31
0.51
SYMBOL
MIN NOM MAX
0.10
-
0.25
D
1.75
1.25
0.17
0.25
6.00 BSC
3.90 BSC
1.27 BSC
1.27
1.04 REF
0.25 BSC
0
5
8
15
-
-
-
-
-
-
-
A
A2
A1
SEATING PLANE
SIDE VIEW
L1
L
1
1
Seating Plane
Gauge Plane
L2
VIEW C
TOP VIEW
e
E
E/2
E1
A
INDEX AREA
(D/2 X E1/2)
E1/2
D
b
1
8 PIN NSOIC
PACKAGE:
c
WITH PLATING
BASE METAL
b
CONTACT AREA
10
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
PACKAGE: 8 PIN DFN
Top View
D
A
D2
Bottom View
E2
b
e
L
A1
A3
E
E/2
D/2
1
2
K
K
Side View
Pin 1 identifier to be located within this shaded area.
Terminal #1 Index Area (D/2 * E/2)
2x3 8 Pin DFN
JEDEC mo-229C
(VCED-2) Variation
Dimensions in (mm)
Symbol
MIN
NOM
MAX
A
A1
A3
b
D
D2
E2
e
L
0.80
0.90
1.00
0 0.02 0.05
0.20
2.00 BSC
1.50
1.75
0.30
0.40
0.50
1.60
1.90
0.18
0.25
0.30
0.50
2x3 8 Pin DFN
E
3.00 BSC
-
-
-
-
-
-
0.20
-
-
11
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
PACKAGE: 5 PIN SOT-23
A
A2
A1
SIDE VIEW
D
E
E/2
e1
N/2
2
1
b
e
E1
E1/2
N
N/2
+1
L1
L
L2
4X
1
Seating Plane
Gauge Plane
VIEW C
SEE VIEW C
H
B
B
c
WITH PLATING
BASE METAL
b
1
- - 1.45
0 - 0.15
Dimensions in (mm)
5 PIN SOT-23
JEDEC MO-178
(AA) Variation
0.90 1.15 1.30
0.30 - 0.50
0.08 - 0.22
2.90 BSC
2.80 BSC
1.60 BSC
0.30 0.45 0.60
0.60 REF
0 4 8
A
A1
A2
b
c
D
E
E1
L
L1
L2
5 10 15
1
MIN NOM MAX
0.25 BSC
e
e1
1.90 BSC
0.95 BSC
5 PIN SOT-23
12
Date:6/8/2004
SPX3819 500mA, Low Noise LDO Voltage Regulator
Copyright 2004 Sipex Corporation
Corporation
ANALOG EXCELLENCE
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of
the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of
others.
PART NUMBERS
TOP MARK PACKAGE TYPE
SPX3819S-1.8........ .................................................3819S18YYWW............................................8 Pin nSOIC
SPX3819S-1.8/TR.....................................................3819S18YYWW......................... .. ..............8 Pin nSOIC
SPX3819S-2.5 ......... ...............................................3819S25YYWW ......................................... 8 Pin nSOIC
SPX3819S-2.5/TR ....................................................3819S25YYWW ......................................... 8 Pin nSOIC
SPX3819S-3.0........... ..............................................3819S30YYWW ......................................... 8 Pin nSOIC
SPX3819S-3.0/TR.....................................................3819S30YYWW ......................................... 8 Pin nSOIC
SPX3819S-3.3............. ............................................3819S33YYWW ......................................... 8 Pin nSOIC
SPX3819S-3.3/TR.....................................................3819S33YYWW ......................................... 8 Pin nSOIC
SPX3819S-5.0............... ....................................... ..3819S50YYWW ......................................... 8 Pin nSOIC
SPX3819S-5.0/TR.................................................. ..3819S50YYWW ......................................... 8 Pin nSOIC
SPX3819S....................... ........................................3819SYYWW.................................................8 Pin nSOIC
SPX3819S/TR................ ..........................................3819SYYWW.................................................8 Pin nSOIC
SPX3819R2-1.2.........................................................3819S12YWW.............................. .. ..............8 Pin DFN
SPX3819R2-1.2/TR..... ............................................3819S12YWW.............................. .. ..............8 Pin DFN
SPX3819M5...............................................................G1WW ..................................................... 5 Pin SOT-23
SPX3819M5/TR.........................................................G1WW ..................................................... 5 Pin SOT-23
SPX3819M5-1.2........................................................ TBD ........................................................ 5 Pin SOT-23
SPX3819M5-1.2/TR............................................. .... TBD ........................................................ 5 Pin SOT-23
SPX3819M5-1.5...........................................................TBD ....................................................... 5 Pin SOT-23
SPX3819M5-1.5/TR................................................ ....TBD ....................................................... 5 Pin SOT-23
SPX3819M5-1.8..................................................... ..G3WW ..................................................... 5 Pin SOT-23
SPX3819M5-1.8/TR...................................................G3WW ..................................................... 5 Pin SOT-23
SPX3819M5-2.5 ........................................................H3WW ..................................................... 5 Pin SOT-23
SPX3819M5-2.5/TR ..................................................H3WW ..................................................... 5 Pin SOT-23
SPX3819M5-3.0........................................................J3WW .................................................. 5 Pin SOT-23
SPX3819M5-3.0/TR..................................................J3WW .................................................. 5 Pin SOT-23
SPX3819M5-3.1........................................................K3WW ...................................................... 5 Pin SOT-23
SPX3819M5-3.1/TR..................................................K3WW ...................................................... 5 Pin SOT-23
SPX3819M5-3.3.........................................................L3WW ...................................................... 5 Pin SOT-23
SPX3819M5-3.3/TR................. ..................................L3WW ..................................................... 5 Pin SOT-23
SPX3819M5-5.0.........................................................M3WW ..................................................... 5 Pin SOT-23
SPX3819M5-5.0/TR...................................................M3WW ..................................................... 5 Pin SOT-23
Available in lead free packaging. To order add "-L" suffix to part number.
Example:
SPX3819M5-5.0/TR
= standard;
SPX3819M5-L-5.0/TR
= lead free
/TR = Tape and Reel
Pack quantity is 2500 for SOT-23 or NSOIC and 3000 for DFN .
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
ORDERING INFORMATION
PDF 
ZIP