SPX3819
500mA, Low-Noise LDO Voltage Regulator
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.
■ Available in RoHS Compliant, Lead Free
Packages: 5 Pin SOT-23, 8 Pin Narrow
SOIC and 8 pin 2X3 DFN
EN
1
NC
2
VIN
3
NC
4
SPX3819
8 Pin DFN
8
ADJ/BYP
7
GND
6
NC
5
VOUT
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
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
VIN
1
VOUT
5
+
2
+
SPX3819
GND
3
4
EN
BYP
(Opt.)
ENABLE may be tied directly to VIN
TOP View
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
1
© 2007 Sipex Corporation
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 VIN
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.
PARAMETER
Output Voltage Tolerance
MIN
TYP
MAX
UNITS
+1
+2
%
-1
-2
Output Voltage Temperature Coef.
57
♦
CONDITIONS
♦
ppm/°C
Line Regulation
0.04
0.1
%/V
VIN=VOUT + 1V to 16V
Load Regulation
0.05
0.4
%
IL = 0.1mA to 500mA
Dropout Voltage
(VIN-VO)(Note 2)
10
60
80
mV
175
250
mV
350
450
mV
550
700
mV
3
8
µA
150
190
µA
650
900
µA
2.0
2.5
mA
25.0
30.0
mA
125
180
340
Quiescent Current (IGND)
0.05
Ground Pin Current (IGND)
90
250
1.0
6.5
♦
VENABLE ≤ 0.4V
VENABLE ≤ 0.25V
IL = 100µA
♦
IL = 50mA
♦
IL = 150mA
♦
IL = 500mA
♦
70
dB
mA
950
VOUT = 0.0V
♦
300
µVRMS
IL=10mA, CL=1.0µF, CIN=1µF,
(10Hz-100kHz)
40
µVRMS
IL=10mA, CL=10µF, CBYP =1µF,
CIN =1µF, (10Hz-100kHz)
Input Voltage Level Logic Low (VIL)
Thermal Resistance (Note 1)
IL = 500mA
♦
800
ENABLE Input Current
IL = 150mA
♦
Current Limit (ILIMIT)
Input Voltage Level Logic High (VIH)
IL = 50mA
♦
Ripple Rejection (PSRR)
Output Noise (eNO)
IL = 100µA
♦
0.4
V
OFF
V
ON
2
20
µA
VIL ≤ 0.4V
VIH ≥ 2.0V
2
0.01
3
191
°C/W
♦
SOT-23-5 / Junction to Ambient
128.4
°C/W
♦
NSOIC-8 / Junction to Ambient
59
°C/W
♦
DFN-8 / Junction to Ambient
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.
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
2
© 2007 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
7.0
160
3.3V Device
VIN= 4.3V
CL = 1.0µF
6.0
150
140
5.0
120
100
3.0
IGND (µA)
IGND (mA)
130
4.0
2.0
1.0
90
80
3.3V Device
CL= 1.0µF
IL = 100µA
70
60
4
0.0
0
100
200
300
400
6
500
8
IL (mA)
10
12
14
16
VIN (V)
Ground Current vs Input Voltage
Ground Current vs Load Current
14.0
3.350
3.3V Device
VIN= 4.3V
CL = 1.0µF
12.0
3.345
3.340
10.0
3.335
VOUT (V)
IGND (mA)
3.330
8.0
6.0
3.325
3.320
3.315
3.310
4.0
3.3V Device
CL= 1.0µF
IL = 100µA
3.305
3.300
2.0
3.295
3.290
0.0
0
100
200
300
400
4
500
6
10
12
14
VIN (V)
IL (mA)
Output Voltage vs Input Voltage
Ground Current vs Load Current in Dropout
Jun 5-07 Rev E
8
SPX3819 500mA, Low Noise LDO Voltage Regulator
3
© 2007 Sipex Corporation
16
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
3.316
350
250
3.3V Device
3.314
CL = 1.0µF
3.312
3.3V Device
VIN= 4.3V
CL = 1.0µF
3.310
200
VOUT (V)
Dropout (mV)
300
150
3.308
3.306
100
3.304
50
3.302
0
0
100
200
300
400
3.300
500
0
100
200
IL (mA)
300
400
500
IL (mA)
Output Voltage vs Load Current
Dropout Voltage vs Load Current
130
360
3.3V Device
VIN= 4.3µF
CL= 1.0µF
IL = 100µA
120
3.3V Device
VIN = 4.3
CL= 1.0µF
IL = 50mA
340
320
300
IGND (µA)
IGND (µA)
110
100
280
260
90
240
80
220
200
70
-40
-20
0
20
40
60
80
100
-40
120
-20
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Ground Current vs Temperature with 50mA Load
Ground Current vs Temperature with 100µA Load
Jun 5-07 Rev E
0
SPX3819 500mA, Low Noise LDO Voltage Regulator
4
© 2007 Sipex Corporation
120
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
14.0
8.0
3.3V Device
VIN= 4.3µF
CL= 1.0µF
IL = 500mA
13.5
13.0
IGND (mA)
IGND (mA)
7.5
3.3V Device
VIN= 4.3µF
CL= 1.0µF
IL = 500mA
7.0
12.5
12.0
11.5
6.5
11.0
6.0
10.5
-40
-20
0
20
40
60
80
100
120
-40
-20
0
Temperature (°C)
40
60
80
100
120
Temperature (°C)
Ground Current vs Temperature in Dropout
Ground Current vs Temperature with 500mA Load
3.400
1.30
3.3V Device
CL= 1.0µF
IL = 100µA
3.380
1.25
3.3V Device
VIN= 4.3µF
CL= 1.0µF
IL = 500mA
3.360
3.340
1.20
VOUT (V)
VEN, On Threshold (V)
20
1.15
3.320
3.300
2.280
1.10
2.260
2.240
1.05
2.220
2.200
1.00
4
6
8
10
12
14
-40
16
-20
20
40
60
80
100
Output Voltage vs Temperature
ENABLE Voltage, ON threshold, vs Input Voltage
Jun 5-07 Rev E
0
Temperature (°C)
VIN (V)
SPX3819 500mA, Low Noise LDO Voltage Regulator
5
© 2007 Sipex Corporation
120
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
350
Cin = 1uFT,
Cout = 1uFT
Cin = 1uFT,
Cout = 2.2uFT
Cin = 1uFT
Cout = 10uFT
300
uV RMS
250
200
150
100
50
0
1
10
100
1000
10000
Bypass Cap (pF)
100000 1000000
Line Transient Response for 3.3V Device
Output Noise vs Bypass Capacitor Value IL = 10mA,
10Hz - 100kHz
Load Transient Response for 3.3V Device
Jun 5-07 Rev E
SPX3819 500mA, Low Noise LDO Voltage Regulator
6
© 2007 Sipex Corporation
APPLICATION INFORMATION
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 sourcing
less current, a lower output capacitance may be
sufficient. For example, a regulator outputting
only 10mA, requires approximately half the
capacitance as the same regulator sourcing
150mA.
concern. The SPX3819 start-up speed is inversely proportional to the size of the BYP
capacitor. Applications requiring a slow rampup of the output voltage should use a larger
CBYP. However, if a rapid turn-on is necessary,
the BYP capacitor can be omitted.
The SPX3819’s internal reference is available
through the BYP pin.
Bench testing is the best method for determining
the proper type and value of the capacitor since
the high frequency characteristics of electrolytic capacitors vary widely, depending on type
and manufacturer. A high quality 2.2µF aluminum electrolytic capacitor works in most application circuits, but the same stability often can
be obtained with a 1µF tantalum electrolytic.
Figure 1 represents a SPX3819 standard application 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:
With the SPX3819 adjustable version, the minimum value of output capacitance is a function of
the output voltage. The value decreases with
higher output voltages, since closed loop gain is
increased.
VOUT = 1.235V x [ 1 + R1/R2]
R2 must be > 10 kΩ and for best results, R2
should be between 22 kΩ and 47kΩ.
Typical Applications Circuits
A 10nF capacitor on the BYP pin will significantly reduce output noise, but it may be left
unconnected if the output noise is not a major
VIN
1
VOUT
5
VIN
1
+
+
SPX3819
+
4
+
SPX3819
SOT-23
GND
3
3
EN
4
EN
BYP
(Opt.)
R2
Hi-ON
Lo-OFF
ENABLE may be tied directly to VIN
TOP View
TOP View
Figure 2. Typical Adjustable Output Voltage Configuration
Figure 1. Standard Application Circuit
Jun 5-07 Rev E
R1
2
2
GND
VOUT
5
SPX3819 500mA, Low Noise LDO Voltage Regulator
7
© 2007 Sipex Corporation
PACKAGE: PIN DESCRIPTION
Pin #
nSOIC
Pin #
DFN
Pin #
SOT-3
Pin Name
2
3
1
VIN
5-8
7
2
GND
Ground
3
5
5
VOUT
Regulator Output
1
1
3
EN
Enable(input). CMOS compatible
control input. Logic high = enable;
logic low or open = shutdown
4
8
4
ADJ/BYP
Adjust(input). Feedback input.
Connect to resistive voltage-divider
network
-
4, 6
-
NC
Description
Supply Input
No Connect
PACKAGE: PINOUTS
EN
NC
1
2
VIN
3
NC
4
SPX3819
8 Pin DFN
8
ADJ/BYP
7
GND
6
NC
5
VOUT
8 GND
EN 1
VIN 2
SPX3819
7 GND
8 Pin nSOIC
VOUT 3
6 GND
ADJ/BYP 4
5 GND
Note: The bottom exposed pad for the SPX3819
DFN package is connected to GND.
VOUT
ADJ/BYP
4
5
SPX3819
5 Pin SOT-23
1
VIN
Jun 5-07 Rev E
2
GND
3
EN
SPX3819 500mA, Low Noise LDO Voltage Regulator
8
© 2007 Sipex Corporation
ORDERING INFORMATION
Part Number
Accuracy
MSL Level
Status
Package
Pack Type
Quantity
RoHS
SPX3819S-L/TR
0.01
L1 @ 260ºC
Active
NSOIC8
Tape & Reel
2500
Yes
SPX3819S-L-1-8/TR
0.01
L1 @ 260ºC
Active
NSOIC8
Tape & Reel
2500
Yes
SPX3819S-L-2-5/TR
0.01
L1 @ 260ºC
Active
NSOIC8
Tape & Reel
2500
Yes
SPX3819S-L-3-0/TR
0.01
L1 @ 260ºC
Active
NSOIC8
Tape & Reel
2500
Yes
SPX3819S-L-3-1/TR
0.01
L1 @ 260ºC
Active
NSOIC8
Tape & Reel
2500
Yes
SPX3819S-L-3-3/TR
0.01
L1 @ 260ºC
Active
NSOIC8
Tape & Reel
2500
Yes
SPX3819S-L-5-0/TR
0.01
L1 @ 260ºC
Active
NSOIC8
Tape & Reel
2500
Yes
SPX3819S-L
0.01
L1 @ 260ºC
Active
NSOIC8
TUBE
98
Yes
SPX3819S-L-1-8
0.01
L1 @ 260ºC
Active
NSOIC8
TUBE
98
Yes
SPX3819S-L-2-5
0.01
L1 @ 260ºC
Active
NSOIC8
TUBE
98
Yes
SPX3819S-L-3-0
0.01
L1 @ 260ºC
Active
NSOIC8
TUBE
98
Yes
SPX3819S-L-3-1
0.01
L1 @ 260ºC
Active
NSOIC8
TUBE
98
Yes
SPX3819S-L-3-3
0.01
L1 @ 260ºC
Active
NSOIC8
TUBE
98
Yes
SPX3819S-L-5-0
0.01
L1 @ 260ºC
Active
NSOIC8
TUBE
98
Yes
SPX3819M5-L
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-1-2
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-1-5
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-1-8
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-2-5
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-3-0
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-3-1
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-3-3
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L-5-0
0.01
L1 @ 260ºC
Active
SOT-23-5
Not in Bulk
2500
Yes
SPX3819M5-L/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-1-2/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-1-5/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-1-8/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-2-5/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-3-0/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-3-1/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-3-3/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819M5-L-5-0/TR
0.01
L1 @ 260ºC
Active
SOT-23-5
Tape & Reel
2500
Yes
SPX3819R2-L-1-2
0.01
L1 @ 250ºC
CF
DFN8
Not in Bulk
3000
Yes
SPX3819R2-L-1-2/TR
0.01
L1 @ 250ºC
CF
DFN8
Tape & Reel
3000
Yes
SPX3819S-L-1-2/TR
0.01
L1 @ 260ºC
CF
SOIC-8
Tape & Reel
2500
Yes
SPX3819S-L-1-5/TR
0.01
L1 @ 260ºC
CF
SOIC-8
Tape & Reel
2500
Yes
SPX3819S-L-1-2
0.01
L1 @ 260ºC
CF
SOIC-8
TUBE
98
Yes
SPX3819S-L-1-5
0.01
L1 @ 260ºC
CF
SOIC-8
TUBE
98
Yes
ORDERING INFORMATION
Accuracy
MSL Level
Status
Package
Pack Type
Quantity
RoHS
SPX3819R2-L
0.01
L1 @ 250ºC
EOL
DFN8
Not in Bulk
3000
Yes
SPX3819R2-L-1-5
0.01
L1 @ 250ºC
EOL
DFN8
Not in Bulk
3000
Yes
SPX3819R2-L-1-8
0.01
L1 @ 250ºC
EOL
DFN8
Not in Bulk
3000
Yes
SPX3819R2-L-3-3
0.01
L1 @ 250ºC
EOL
DFN8
Not in Bulk
3000
Yes
SPX3819R2-L-5-0
0.01
L1 @ 250ºC
EOL
DFN8
Not in Bulk
3000
Yes
SPX3819R2-1-2
0.01
L1 @ 240ºC
EOL
DFN8
Not in Bulk
3000
No
SPX3819R2-3-3
0.01
L1 @ 240ºC
EOL
DFN8
Not in Bulk
3000
No
SPX3819R2-1-2/TR
0.01
L1 @ 240ºC
EOL
DFN8
Tape & Reel
3000
No
SPX3819S/TR
0.01
L1 @ 240ºC
EOL
NSOIC8
Tape & Reel
2500
No
SPX3819S-2-5/TR
0.01
L1 @ 240ºC
EOL
NSOIC8
Tape & Reel
2500
No
SPX3819S
0.01
L1 @ 240ºC
EOL
NSOIC8
TUBE
98
No
SPX3819S-2-5
0.01
L1 @ 240ºC
EOL
NSOIC8
TUBE
98
No
SPX3819S-3-3/TR
0.01
L1 @ 240ºC
EOL
SOIC-8
Tape & Reel
2500
No
SPX3819S-1-8
0.01
L1 @ 240ºC
EOL
SOIC-8
TUBE
98
No
SPX3819S-3-3
0.01
L1 @ 240ºC
EOL
SOIC-8
TUBE
98
No
SPX3819S-5-0
0.01
L1 @ 240ºC
EOL
SOIC-8
TUBE
98
No
SPX3819M5
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-1-2
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-1-5
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-1-8
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-2-5
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-3-0
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-3-1
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-3-3
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5-5-0
0.01
L1 @ 240ºC
EOL
SOT-23-5
Not in Bulk
2500
No
SPX3819M5/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
SPX3819M5-1-2/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
SPX3819M5-1-5/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
SPX3819M5-1-8/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
SPX3819M5-2-5/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
SPX3819M5-3-0/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
SPX3819M5-3-3/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
SPX3819M5-5-0/TR
0.01
L1 @ 240ºC
EOL
SOT-23-5
Tape & Reel
2500
No
Part Number
For further assistance:
Email:
WWW Support page:
Sipex Application Notes:
Sipexsupport@sipex.com
http://www.sipex.com/content.aspx?p=support
http://www.sipex.com/applicationNotes.aspx
Solved by
TM
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
tel: (408) 934-7500
fax: (408) 935-7600
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.
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