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SPX3819

500mA, Low-Noise LDO Voltage Regulator

Signal Processing Technologies 

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

8

SPX3819

NC 2

7

VIN 3 8 Pin DFN 6

NC 4

5

ADJ/BYP

GND

NC

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

5

VOUT

+

2

+ GND

SPX3819

3

EN

4 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

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