
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: 40
μ
V Possible
■
High Accuracy: 1%
■
Reverse Battery Protection
■
Low Dropout: 340mV at Full Load
■
Low Quiescent Current: 90
μ
A
■
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.
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
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 800
μ
A 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.
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
V
IN
ADJ/BYP
V
OUT
GND
5
6
7
8
1
2
3
4
Now Available in Lead Free Packaging