1
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
500mA, Low-Noise LDO Voltage Regulator
DESCRIPTION
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
■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 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.
APPLICATIONS
■Battery Powered Systems
■Cordless Phones
■Radio Control Systems
■Portable/Palm Top/Notebook Computers
TYPICAL APPLICATION CIRCUIT
+
+
GND
EN BYP
(Opt.)
ENABLE may be tied directly to V
IN
SPX3819
1
2
34
5
V
IN
V
OUT
TOP View
SPX3819
Now Available in Lead Free Packaging
■Portable Consumer Equipment
■Portable Instrumentation
■Bar Code Scanners
■SMPS Post Regulators
SPX3819
8 Pin DFN
EN
NC
NC
NC
VIN
ADJ/BYP
VOUT
GND
5
6
7
8
1
2
3
4
2
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
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
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
= 100µA
(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
)0.053µAV
ENABLE
≤ 0.4V
8♦V
ENABLE
≤ 0.25V
Ground Pin Current (I
GND
)90150 µAI
L
= 100µA
190 ♦
250 650 µAI
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 µV
RMS
I
L
=10mA, C
L
=1.0µF, C
IN
=1µF,
(10Hz-100kHz)
40 µV
RMS
I
L
=10mA, C
L
=10µF, C
BYP
=1µF,
C
IN
=1µF, (10Hz-100kHz)
Input Voltage Level Logic Low (V
IL
)0.4VOFF
Input Voltage Level Logic High (V
IH
)2 V ON
ENABLE Input Current 0.01 2 µAV
IL
≤ 0.4V
320 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
TJ=25°C, VOUT + 1V, for 1.2V Option VIN=VOUT + 1.2V IL=100µA, CL=1µF, and VENABLE ≥ 2.4V. The
♦
denotes the
specifications which apply over full operating temperature range -40°C to +85°C, unless otherwise specified.
ABSOLUTE MAXIMUM RATINGS
NOTES
Note 1: The maximum allowable power dissipation is a function of maximum operating junction temperature, TJ(max) the junction to ambient thermal
resistance, and the ambient θJA, and the ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is
given: PD(max) = (TJ(max)-TA)/θJA, exceeding the maximum allowable power limit will result in excessive die temperature; thus, the regulator will
go into thermal shutdown. The θJA of the SPX3819 is 220°C/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 ................... -40°C to +125°C
Enable Input Voltage .............................................................. 0V to VIN
RECOMMENDED OPERATIONG CONDITIONS
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Date: 11/29/04 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
IL (mA)
IGND (mA)
3.3V Device
VIN= 4.3V
CL = 1.0µF
160
150
140
130
120
110
100
90
80
70
60
46810121416
V
IN
(V)
I
GND
(µA)
3.3V Device
C
L
= 1.0µF
I
L
= 100µA
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
IL (mA)
IGND (mA)
3.3V Device
VIN= 4.3V
CL = 1.0µF
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
46810121416
V
IN
(V)
V
OUT
(V)
3.3V Device
CL= 1.0µF
IL = 100µA
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Date: 11/29/04 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 100µA Load Ground Current vs Temperature with 50mA Load
350
300
250
200
150
100
50
0
0 100 200 300 400 500
IL (mA)
Dropout (mV)
3.3V Device
VIN= 3.2V
CL = 1.0µF
3.316
3.314
3.312
3.310
3.308
3.306
3.304
3.302
3.300
0100 200 300 400 500
IL (mA)
VOUT (V)
3.3V Device
V
IN
= 4.3V
C
L
= 1.0µF
130
120
110
100
90
80
70
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
IGND (µA)
3.3V Device
VIN= 4.3µF
CL= 1.0µF
IL = 100µA
360
340
320
300
280
260
240
220
200
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
I
GND
(µA)
3.3V Device
V
IN
= 4.3
C
L
= 1.0µF
I
L
= 50mA
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
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Date: 11/29/04 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
= 4.3µF
C
L
= 1.0µF
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
= 4.3µF
C
L
= 1.0µF
I
L
= 500mA
1.30
1.25
1.20
1.15
1.10
1.05
1.00
46810121416
VIN (V)
VEN, On Threshold (V)
3.3V Device
C
L
= 1.0µF
I
L
= 100µA
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)
VOUT (V)
3.3V Device
VIN= 4.3µF
CL= 1.0µF
IL = 500mA
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
6
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
Output Noise vs Bypass Capacitor Value IL = 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
110100 1000 10000 100000 1000000
Bypass Cap (pF)
uV RMS
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
7
Date: 11/29/04 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 2.2µF alumi-
num electrolytic capacitor works in most appli-
cation circuits, but the same stability often can
be obtained with a 1µF 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 CBYP. 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 (R1 and R2) set the output voltage. The
output voltage is calculated using the formula:
VOUT = 1.235V x [ 1 + R1/R2]
R2 must be > 10 kΩ and for best results, R2
should be between 22 kΩ and 47kΩ. 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
34
5
V
IN
V
OUT
TOP View
+
+
GND
EN
BYP
(Opt.)
Hi-ON
Lo-OFF
SPX3819
SOT-23
1
2
34
5
V
IN
V
OUT
R1
R2
ADJ
TOP View
Figure 1. Standard Application Circuit Figure 2. Typical Adjustable Output Voltage Configuration
8
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
PACKAGE: PINOUTS
PACKAGE: PIN DESCRIPTION
#niP
CIOSn
#niP
NFD
#niP
3-TOS emaNniPnoitpircseD
23 1V
NI
tupnIylppuS
8-572 DNGdnuorG
35 5V
TUO
tuptuOrotalugeR
11 3 NEelbitapmocSOMC.)tupni(elbanE
;elbane=hgihcigoL.tupnilortnoc
nwodtuhs=neporowolcigol
48 4 PYB/JDA.tupnikcabdeeF.)tupni(tsujdA
redivid-egatlovevitsiserottcennoC
krowten
-6,4-CNtcennoCoN
SPX3819
8 Pin DFN
EN
NC
NC
NC
VIN
ADJ/BYP
VOUT
GND
5
6
7
8
1
2
3
4
1
2
3
45
6
7
8
EN
ADJ/BYP GND
VOUT
VIN
GND
GND
GND
SPX3819
8 Pin nSOIC
EN
GND
VIN
ADJ/BYP
V
OUT
SPX3819
5 Pin SOT-23
12
4
5
3
9
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
PACKAGE: 8 PIN SOIC
AA1
A2
SIDE VIEW
Seating Plane
SECTION B-B
WITH PLATING
SYMBOL MIN NOM MAX
A 1.35 - 1.75
A1 0.1 - 0.25
A2 1.25 - 1.65
b 0.31 - 0.51
c 0.17 - 0.24
D
E
E1
e
L 0.4 - 1.27
L1
L2
ø0º-8º
ø1 5º - 15º
Note: Dimensions in (mm)
8 Pin NSOIC JEDEC MO-012 (AA) Variation
4.90 BSC
6.00 BSC
3.90 BSC
1.27 BSC
1.04 REF
0.25 BSC
Gauge Plane
L1
L
Ø
Ø1
Ø
Seating Plane
L2
VIEW C
TOP VIEW
b
SEE VIEW C
B
B
E
E/2
E1
INDEX AREA
(D/2 X E1/2)
E1/2
D
1
e
c
BASE METAL
b
10
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
PACKAGE: 8 PIN DFN
D
E
E/2
D/2
A
A3
A1
Side View
SYMBOL MIN NOM MAX
A 0.8 0.9 1
A1 0 0.02 0.05
A2 0.55 0.65 0.8
A3
b 0.18 0.25 0.3
D
D2 1.5 1.75
e-0.5 -
E
E2 1.6 - 1.9
K 0.2 - -
L 0.3 0.4 0.5
Note: Dimensions in (mm)
2x3 8 Pin DFN JEDEC MO-229 (VCED-2)
VARIATION
0.20 REF
2.00 BSC
3.00 BSC
Top View
Bottom View
b
e
L
K
D2
E2
12
11
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
PACKAGE: 5 PIN SOT-23
D
E
E/2
e1
N/22
1
b
e
E1
E1/2
NN/2
+1
L1
L
L
Ø
Seating Plane
Gauge Plane
VIEW C
SEE VIEW C
B
B
c
WITH PLATING
BASE METAL
b
ØØ
SECTION B-B
Seating Plane
VIEW A-A
SIDE VIEW
SYMBOL MIN NOM MAX
A--1.45
A1 0 - 0.15
A2 0.9 1.15 1.3
b0.3-0.5
c0.08-0.22
D
E
E1
e
e1
L0.30.45 0.6
L1
L2
Ø0º4º8º
ø5º10º 15º
Note: Dimensions in (mm)
5 Pin SOT-23 JEDEC MO-178 (AA) Variation
2.80 BSC
1.60 BSC
2.90 BSC
0.95 BSC
1.90 BSC
0.60 REF
0.25 BSC
AA2
A1
12
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
Corporation
ANALOG EXCELLENCE
PART NUMBERS TOP MARK PACKAGE TYPE
SPX3819M5........ ....................................................G1WW..................................... ... ..............5 Pin SOT-23
SPX3819M5/TR........................................................G1WW..................................... ... ..............5 Pin SOT-23
SPX3819M5-1.2........................................................A4WW..................................... ... ..............5 Pin SOT-23
SPX3819M5-1.2/TR............................................. ....A4WW..................................... ... ..............5 Pin SOT-23
SPX3819M5-1.5........................................................W3WW..................................... .. ..............5 Pin SOT-23
SPX3819M5-1.5/TR................................................ .W3WW..................................... .. ..............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
CLICK HERE TO ORDER SAMPLES
13
Date: 11/29/04 SPX3819 500mA, Low Noise LDO Voltage Regulator © Copyright 2004 Sipex Corporation
PART NUMBERS TOP MARK PACKAGE TYPE
SPX3819R-1.2........ ......................................3819S12YWW....................................... .... ..............8 Pin DFN
SPX3819R-1.2/TR......... ...............................3819S12YWW....................................... .... ..............8 Pin DFN
SPX3819R-1.5........ ......................................3819S15YWW....................................... .... ..............8 Pin DFN
SPX3819R-1.5/TR........ ................................3819S15YWW....................................... .... ..............8 Pin DFN
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
ORDERING INFORMATION
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SPX3819R-3.3/TR = standard; SPX3819R-L-3.3/TR = lead free
/TR = Tape and Reel
Pack quantity is 2500 for SOT-23 or NSOIC and 3000 for DFN .
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.
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
CLICK HERE TO ORDER SAMPLES