SPX3819
500mA Low-
Noise LDO Voltage Regulator
December 2019
Rev. 2.0.5
1/13 Rev. 2.0.5
GENERAL 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
output voltage options or with an adjustable
output voltage.
This device is offered in 8 pin NSOIC, 8 pin DFN
and 5-pin SOT-23 packages.
APPLICATIONS
• Portable Consumer Equipment
• Portable Instrumentation
• Industrial Equipment
• SMPS Post Regulators
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 & Adjustable Output Voltages:
− 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.3V & 5.0V
Fixed Output Voltages
− ≥1.235V Adjustable Output Voltages
• Available in RoHS Compliant, Lead Free
Packages:
− 5-pin SOT-23, 8-pin SOIC and 8-pin DFN
TYPICAL APPLICATION DIAGRAM
Fig. 1: SPX3819 Application Circuit
SPX3819
500mA Low-
Noise LDO Voltage Regulator
2/13 Rev. 2.0.5
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect
reliability.
VIN, EN ..................................................... -20V to +20V
Storage Temperature .............................. -65°C to 150°C
Junction Temperature .......................................... 150°C
Power Dissipation ................................ Internally Limited
Lead Temperature (Soldering, 5 sec) ..................... 260°C
ESD Rating (HBM - Human Body Model) .................... 1kV
OPERATING RATINGS
Input Voltage Range VIN ................................ 2.5V to 16V
Enable Pin EN ............................................... 0.0V to VIN
Junction Temperature Range ................. -40°C to +125°C
Thermal Resistance1 .....................................................
θJA (SOT23-5) ...............................................191°C/W
θJA (NSOIC-8) ............................................ 128.4°C/W
θJA (DFN-8) ................................................... 59°C/W
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.
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Junction Temperature of TJ = 25°C only; limits applying over the full
Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for
reference purposes only. Unless otherwise indicated, VIN = VOUT + 1V (VIN = VOUT + 1.2V for 1.2V option), IL = 100µA, CL =
1µF, VEN ≥ 2.5V, TA= TJ = 25°C.
Parameter Min. Typ. Max. Units Conditions
Output Voltage Tolerance
-1
+1 %
-2
+2
•
Output Voltage Temperature
Coefficient
57 ppm/°C
Line Regulation
0.04
0.1
%/V
VIN = VOUT +1 to 16V and VEN ≤ 6V
0.2
•
VIN = VEN = VOUT +1 ≤ 8V
0.2
V
IN
= V
EN
= V
OUT
+1 ≤16V
TA = 25°C to 85°C
Load Regulation
0.05
0.4
%
IL = 0.1mA to 500mA
Dropout Voltage (VIN-VOUT) 2
10
60
mV
IL = 100µA
80
•
125
175
IL = 50mA
250
•
180
350
IL = 150mA
450
•
340
550
IL = 500mA
700
•
Quiescent Current (IGND)
0.05
3
µA
VENABLE ≤ 0.4V
8
•
VENABLE = 0.25V
Ground Pin Current (IGND)
90
150
µA
IL = 100µA
190
•
250
650
IL = 50mA
900
•
1.0
2.0
mA
IL = 150mA
2.5
•
6.5
25.0
IL = 500mA
30.0
•
Ripple Rejection (PSRR)
70 dB
SPX3819
500mA Low-
Noise LDO Voltage Regulator
3/13 Rev. 2.0.5
Parameter
Min.
Typ.
Max.
Units
Conditions
Current Limit (ILIMIT)
800
mA
VOUT=0V
950
•
Output Noise (eNO)
300 µVRMS IL = 10mA, CL = 1.0µF, CIN = 1µF,
(10Hz – 100kHz)
40 µVRMS IL = 10mA, CL = 1.0µF, CBYP = 1µF,
C
IN
= 1µF, (10Hz – 100kHz)
Input Voltage Level Logic Low
(VIL) 0.4 V OFF
Input Voltage Level Logic High
(VIH) 2 V ON
ENABLE Input Current
0.01
2
µA
VIL ≤ 0.4V
VIH ≥ 2.0V
3
20
Note 2: Not applicable to output voltage 2V or less.
PIN ASSIGNMENT
Fig. 2: SPX3819 Pin Assignment
PIN DESCRIPTION
Name
Pin #
nSOIC
Pin #
DFN
Pin #
SOT-23 Description
VIN
1
Supply Input
GND
2
Ground
VOUT
3 5
5
Regulator Output
EN 1 1 3 Enable(input). CMOS compatible control input. Logic high –
enable;
logic low or open = shutdown
ADJ
4 8 4
Adjustable part only. Feedback input. Connect to resistive voltage-
divider network
BYP Fixed version only. Internal reference bypass pin. Connect 10nF
to ground to reduce thermal noise on the output.
NC
- 2, 4, 6
-
No Connect
SPX3819
500mA Low-
Noise LDO Voltage Regulator
4/13 Rev. 2.0.5
ORDERING INFORMATION(1)
Part Number Operating Temperature Range Lead-Free Package Packaging Method
SPX3819M5-L/TR
-40°C≤TJ≤+125°C Yes(2)
SOT-23-5
Tape & Reel
SPX3819M5-L-1-2/TR
SPX3819M5-L-1-5/TR
SPX3819M5-L-1-8/TR
SPX3819M5-L-2-5/TR
SPX3819M5-L-3-0/TR
SPX3819M5-L-3-3/TR
SPX3819M5-L-5-0/TR
SPX3819R2-L/TR DFN-8
SPX3819R2-L-1-2/TR
SPX3819S-L/TR NSOIC-8
SPX3819S-L-5-0/TR
NOTES:
1. Refer to www.maxlinear.com/SPX3819 for most up-to-date Ordering Information
2. Visit www.maxlinear.com for additional information on Environmental Rating.
SPX3819
500mA Low-
Noise LDO Voltage Regulator
5/13 Rev. 2.0.5
TYPICAL PERFORMANCE CHARACTERISTICS
Fig. 3: Ground Current vs Load Current
Fig. 4: Ground Current vs Input Voltage
Fig. 5 Ground Current vs Load Current in Dropout
Fig. 6 Output Voltage vs Input Voltage
Fig. 7 Dropout Voltage vs Load Current
Fig. 8 Output Voltage vs Load Current
SPX3819
500mA Low-
Noise LDO Voltage Regulator
6/13 Rev. 2.0.5
Fig. 9 Ground Current vs Temperature with 100μA Load
Fig. 10 Ground Current vs Temperature with 50mA Load
Fig. 11 Ground Current vs Temperature with 500mA Load
Fig. 12 Ground Current vs Temperature in Dropout
Fig. 13 ENABLE Voltage, ON threshold, vs Input Voltage
Fig. 14 Output Voltage vs Temperature
SPX3819
500mA Low-
Noise LDO Voltage Regulator
7/13 Rev. 2.0.5
Fig. 15 Output Noise vs Bypass Capacitor Value IL = 10mA,
10Hz - 100kHz
Fig. 16 Line Transient Response for 3.3V Device
Fig. 17 Load Transient Response for 3.3V Device
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.
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.
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.
TYPICAL APPLICATIONS CIRCUITS
For fixed voltage options only. 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 concern. The
SPX3819 start-up speed is inversely
proportional to the size of the BYP capacitor.
SPX3819
500mA Low-
Noise LDO Voltage Regulator
8/13 Rev. 2.0.5
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.
Figure 18 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.
Fig. 18: Standard Application Circuit
The SPX3819 in Figure 19 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 >10kΩ and for best results, R2
should be between 22kΩ and 47kΩ.
Fig. 19: Typical Adjustable Output Voltage Configuration
SPX3819
500mA Low-
Noise LDO Voltage Regulator
9/13 Rev. 2.0.5
MECHANICAL DIMENSIONS 8-PIN SOICN
SPX3819
500mA Low-
Noise LDO Voltage Regulator
10/13 Rev. 2.0.5
MECHANICAL DIMENSIONS (CONTINUED) 8-PIN 2X3 DFN
SPX3819
500mA Low-
Noise LDO Voltage Regulator
11/13 Rev. 2.0.5
RECOMMENDED LAND PATTERN AND STENCIL 8-PIN 2X3 DFN
SPX3819
500mA Low-
Noise LDO Voltage Regulator
12/13 Rev. 2.0.5
MECHANICAL DIMENSIONS (CONTINUED) 5-PIN SOT-23
SPX3819
500mA Low-
Noise LDO Voltage Regulator
13/13 Rev. 2.0.5
REVISION HISTORY
Revision Date Description
2.0.0 08/23/12 Reformat of Datasheet
Addition of SPX3819R2-L and SPX3819R2-L/TR part numbers
2.0.1
12/02/13
Added Storage Temperature Range and Junction Temperature in ABS MAX Ratings.
2.0.2 05/20/14
Updated package drawings and corrected DFN-8 package marking information
[ECN 1423-03 6/3/14]
2.0.3
08/31/16
Updated logo and Ordering Information table.
2.0.4 07/19/18
Update to MaxLinear logo. Updated format and Ordering Information. Clarified ADJ and
BYP pin. Correct y-axis on Figure 14. Updated ESD rating.
2.0.5
12/05/19
Corrected table alignment on last 5 specs of the Electrical Specifications table.
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www.maxlinear.com
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