1

Date:6/8/2004

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

■ Portable Consumer Equipment

■ Portable Instrumentation

■ Bar Code Scanners

■ SMPS Post Regulators

TYPICAL APPLICATION CIRCUIT

+

+

GND

EN

BYP

(Opt.)

ENABLE may be tied directly to V

IN

SPX3819

1

2

3

4

5

V

IN

V

OUT

TOP View

SPX3819

SPX3819

8 Pin DFN

EN

NC

NC

NC

ADJ/BYP

GND

5

6

7

8

1

2

3

4

Now Available in Lead Free Packaging