SPX3819M5-L-2-5/TR - MaxLinear, Inc.

SPX3819

500mA Low-

Noise LDO Voltage Regulator

July 2018

Rev. 2.0.4

1/13 Rev. 2.0.4

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. 2.0.4

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

Stor age Temperature .............................. -65°C to 150°C

Junction Temperature .......................................... 150°C

Power Dissipation ................................ Internally Limited

Lead Tempera tur e (Soldering, 5 sec) ..................... 260°C

ESD Rating (HBM - Human Body Model) .................... 1kV

OPERATING RATINGS

Input Voltage Ran ge 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 resistanc e, 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 all owable power limit w ill result in exc essiv e

die temperature; thus, the regulator will go into thermal

shutdown.

ELECTRICAL SP ECIFICATIONS

Spec ificatio ns with standard typ e are for an Operating Junction Te mperature 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,

desig n, or statis tic a l c or relation. Typic a l value s repr ese nt the mos t lik e ly p aram e tric nor m at TJ = 25°C, and are provided for

referenc e purposes only . Unless o therwise indic ated, VIN = VOUT + 1V (VIN = VOUT + 1.2V for 1 .2V optio n), IL = 100µA, CL =

1µF, VEN ≥ 2.5V, TA= TJ = 25°C.

Parameter Min. Typ. Max. Units Conditions

Output Voltag e Tole rance

-1

+1 %

-2

•

Output Voltag e Temp er ature

Coefficient

57 ppm/°C

Line Regulatio n

0.04

0.1

%/V

VIN = VOUT +1 to 16V and VEN ≤ 6V

0.2

•

VIN = VEN = VOUT +1 ≤ 8V

0.2

= V

OUT

+1 ≤16V

TA = 25°C to 85°C

Load Regulation

0.05

0.4

IL = 0.1mA t o 50 0mA

Dropout Volta g e (VIN-VOUT) 2

IL = 100µA

•

125

175

IL = 50mA

250

•

180

350

IL = 150mA

450

•

340

550

IL = 5 00mA

700

•

Quiescent Current (IGND)

0.05

µA

VENABLE ≤ 0.4V

•

VENABLE = 0.25V

Ground Pin C urrent (IGND)

150

µA

IL = 100µA

190

•

250

650

IL = 50mA

900

•

1.0

2.0

IL = 1 50mA

2.5

•

6.5

25.0

IL = 5 00mA

30.0

•

Ripp le Reje c tion (PSRR)

70 dB

SPX3819

500mA Low-

Noise LDO Voltage Regulator

3/13 Rev. 2.0.4

Current Limit (I

LIMIT

)

800

OUT

=0V

Current Limit (ILIMIT)

Output No ise (e NO)

950

µVRMS

•

VOUT=0V

IL = 10mA, CL = 1.0µF, CIN = 1µF,

(10Hz – 100kHz)

300

Output No ise (e NO)

Input Vo ltag e Leve l Log ic Low

(VIL)

40 µVRMS

= 10mA, C

= 1.0µF, C

BYP

= 1µF,

= 1µF, (10Hz – 100kHz)

0.4 V OFF

Input Vo ltag e Leve l Log ic High

)

2 V ON

ENABLE Input Current 0.01 2 µA VIL ≤ 0.4V

VIH ≥ 2.0V

ENABLE Input Current

µA

VIL ≤ 0.4V

VIH ≥ 2.0V

Note 2: Not applicab le to output vo lta g e 2V or less.

PIN ASSIGNMENT

Fig. 2: SPX3819 Pin Ass ignment

PIN DESCRIPTION

Name Pin #

nSOIC

Pin #

DFN

Pin #

SOT-23 Description

VIN

Supply Input

GND

5, 6, 7, 8 7

Ground

VOUT

Regulator Output

EN 1 1 3 Enable(inp ut). C MO S co mp a tible co ntr ol input. Logic high –

enable;

logic low or ope n = shutdown

ADJ 4 8 4

Adjustable part only. Feedback input. Co nne c t to res is tive voltage -

divid er ne twork

BYP Fixed version only. Internal reference bypass pin. Connect 10nF

to ground to reduce thermal noise on the output.

2, 4, 6

No Connect

SPX3819

500mA Low-

Noise LDO Voltage Regulator

4/13 Rev. 2.0.4

ORDERING INFORMATION(1)

Part Number Operating Temperat ure R ange 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.exar.com/SPX3819 for mos t up-to-date Ordering Information

2. Visit www.exar.com for additional information on Environmental Rating.

SPX3819

500mA Low-

Noise LDO Voltage Regulator

5/13 Rev. 2.0.4

TYPICA L P ERFORMANCE CHARACTERISTICS

Fig. 3: Gro und Curre nt vs Load C urrent

Fig. 4: Ground Current vs Input Voltage

Fig. 5 Ground Current vs Load Current in Dropout

Fig. 6 Outp ut Volta g e vs Inp ut Voltage

Fig. 7 Dropo ut Vo ltage vs Load Current

Fig. 8 Output Voltage vs Load Current

SPX3819

500mA Low-

Noise LDO Voltage Regulator

6/13 Rev. 2.0.4

Fig. 9 Ground Current vs Temperature with 100μA Load

Fig. 10 Ground Current vs Tempe rature with 50mA Load

Fig. 11 Ground Current vs Tempe rature 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. 2.0.4

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 decre ases with higher output curre nts.

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 o n type and manufactur er. 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. 2.0.4

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

throug h t he BYP pin.

Figure 18 represents a SPX3819 standard

application circu it. The EN (enable) pin is pu lled

high (>2.0V) to enable the regulator. To disable

the regulator, EN < 0.4V.

Fig. 18: Standard Applic ation 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: Typic a l Adj us table Output Voltage Configuration

SPX3819

500mA Low-

Noise LDO Voltage Regulator

9/13 Rev. 2.0.4

MECHANICAL DIMENSIONS 8-PIN SOICN

SPX3819

500mA Low-

Noise LDO Voltage Regulator

10/13 Rev. 2.0.4

MECHANICAL DIMENSIONS (CONTINUED) 8-PIN 2X3 DFN

SPX3819

500mA Low-

Noise LDO Voltage Regulator

11/13 Rev. 2.0.4

RECOMMENDED LAND PATTERN AN D STENCIL 8-PIN 2X3 DFN

SPX3819

500mA Low-

Noise LDO Voltage Regulator

12/13 Rev. 2.0.4

MECHANICAL DIMENSIONS (CONTINUED) 5-PIN SOT-23

SPX3819

500mA Low-

Noise LDO Voltage Regulator

13/13 Rev. 2.0.4

REVISION HISTORY

Revision Date Description

2.0.0 08/23/12 Reformat of Datasheet

Addition of SPX3819R2-L and SPX3819R2-L/TR p art numb ers

2.0.1

12/02/13

Added Stora ge Te mper atur e Rang e and Junctio n Temperature in ABS MAX Ratings.

2.0.2 05/20/14

Updated package dra wi n gs and corrected DFN-8 package marking inf ormation

[ECN 142 3-03 6/3/14]

2.0.3

08/31/16

Updated log o and Ordering Informatio n ta b le .

2.0.4 07/19/18

Update to MaxLine ar lo go . Update d for mat a nd Ordering Info rmation. Clarified ADJ and

BYP pin. Correct y-axis on Figure 14. Updated ESD rating .

Corporate Headquarters:

5966 La Place Court

Suite 100

Carlsbad, CA 92008

Tel.:+1 (760) 692-0711

Fax: +1 (760) 444-8598

www.maxlinear.com

High Performance Analog:

1060 Rincon Circle

San Jose, CA 95131

Tel.: +1 (669) 265-6100

Fax: +1 (669) 265-6101

www.exar.com

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