SPX3819
500mA, LOW-NOISE LDO VOLTAGE REGULATOR
JULY 30, 2008
REV. F
FEATURES
ADJ/BYP
GND
EN
8
7
6
■ Low Noise: 40µV Possible
■ High Accuracy: 1%
SPX3819
NC
8 Pin DFN
V
NC
IN
■ Reverse Battery Protection
■ Low Dropout: 340mV at Full Load
■ Low Quiescent Current: 90µA
■ Zero Off-Mode Current
5
NC
V
OUT
■ Fixed Output: 1.2V, 1.5V, 1.8V, 2.5V, 3.0V,
APPLICATIONS
3.1V, 3.3V, 5.0V. Adj. Output also available.
■ Battery Powered Systems
■ Cordless Phones
■ Available in RoHS Compliant, Lead Free
Packages: 5 Pin SOT-23, 8 Pin Narrow
SOIC and 8 pin 2X3 DFN
■ 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
VOUT
5
+
2
SPX3819
GND
EN
+
3
4
BYP
(Opt.)
ENABLE may be tied directly to V
IN
TOP View
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
1
EXAR [ EXAR CORPORATION ]
