SPX1521M3-L-5-0 - EXAR - Datasheet.Live

SPX1521

FEATURES

■ 1% Output Accuracy 3.3V, 5V,

at 300mA Output

■ Very Low Quiescent Current

■ 0.3V (Typ.) Dropout Voltage at 300mA

■ Extremely Tight Load and Line Regulation

■ Current & Thermal Limiting

■ Reverse Battery Protection

■ Equivalent Replacement For LT1521

■ Available in RoHS Compliant, Lead Free Packages:

TO-252, SOT-223, TO-220 & TO-263

The SPX1521 is a low power voltage regulator. This device is an excellent choice for use in battery-

powered applications such as cordless telephones, radio control systems, and portable computers.

The SPX1521 features very low quiescent current and very low dropout voltage. This includes a tight

initial tolerance of ±1% max, and very low output temperature coefcient, making the SPX1521 useful

as a low-power voltage reference.

The SPX1521 is offered in 3 pin TO-252, SOT-223, TO-220 & TO-263 packages.

300mA Low Dropout Voltage Regulator

DESCRIPTION

+2.2µF

SPX1521

IIN

IN OUT

GND

LOAD

IIN = IL + IG

VOUT

0.1µF

TYPICAL APPLICATIONS CIRCUIT

1 2 3

SPX1521

3 Pin TO-263

GND V

OUT

Solved by

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

Lead Temp. (Soldering, 5 Seconds) .............................................. 260°C

Storage Temperature Range .........................................-65°C to +150°C

Operating Junction Temperature Range ...................... -40°C to +125°C

Input Supply Voltage................................................... -20V to +20V

ABSOLUTE MAXIMUM RATINGS

PARAMETER CONDITIONS TYP MIN MAX UNITS

(Note 2)

3.3V Version

Output Voltage 3.3 3.267 3.333 V

1mA ≤ IL ≤ 300mA 3.3 3.217 3.382

Reverse Output Current VOUT= 3.3V, VIN= 0V 16 25 µA

5.0V Version

Output Voltage 5.0 4.950 5.050 V

1mA ≤ IL ≤ 300mA 5.0 4.880 5.120

Reverse Output Current VOUT= 5.0V, VIN= 0V 16 25 µA

All Voltage Options

Output Voltage 20 100 ppm/°C

Temperature Coefcient (Note1)

Line Regulation 6V ≤ VIN ≤ 20V (Note 4) 1.5 20 mV

Load Regulation (Note 3) IL=1 to 300mA 4 20 mV

Dropout Voltage (Note 5) IL=1mA 0.13 0.17 V

0.25

IL=300mA 0.30 0.55

0.70

Ground Current IL=1mA 100 150 µA

IL=10mA 350 500

IL=50mA 1.5 3 mA

IL=100mA 2 6

IL=300mA 5 14

Current Limit VOUT=0 330 500 mA

Ripple Rejection VIN -VOUT=1V(Avg), 58 50 dB

VRIPPLE=0.5Vp-p,

FRIPPLE=120Hz, ILOAD=150mA

Input Reverse Leakage Current VIN= -20V, VOUT=0V 1.0 mA

Note 1: Output or reference voltage temperature coefcients dened as the worst case voltage change divided

by the total temperature range.

Note 2: Unless otherwise specied all limits are guaranteed for Tj = 25°C, VIN = 6V, IL = 1mA and CL = 2.2µF.

Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle.

Changes in output voltage due to heating effects are covered under the specication for thermal regulation.

Note 4: Line regulation for the SPX1521 is tested at 25°C for IL = 1 mA. For TJ = 125°C, line regulation is

guaranteed by design.

Note 5: Dropout voltage is dened as the input to output differential at which the output voltage drops 100 mV

below its nominal value measured at 1V differential.

Shutdown Input Voltage...................................................-0.6V to +6.5V

ESD Rating ................................................................................2kV Min

ELECTRICAL CHARACTERISTICS

Electrical characteristics at VIN = 6V, IO = 1mA, COUT = 2.2µF, TA= 25°C, unless otherwise specied.

Boldface applies over the full operating temperature range.

External Capacitors

The stability of the SPX1521 requires a

2.2µF or greater capacitor between output

and ground. Oscillation could occur without

this capacitor. Most types of tantalum or

aluminum electrolytic works ne here. For

operations of below -25°C solid tantalum is

recommended since the many aluminum

types have electrolytes that freeze at about

-30°C. The ESR of about 5Ω or less and

resonant frequency above 500kHz are the

most important parameters in the value of

the capacitor. The capacitor value can be

increased without limit.

The SPX1521, unlike other low dropout

regulators will remain stable and in regula-

tion with no load in addition to the internal

voltage divider. This feature is especially

important in applications like CMOS RAM

keep-alive.

If there is more than 10 inches of wire be-

tween the input and the AC lter capacitor,

or if a battery is used as the input, then a

0.1µF tantalum or aluminum electrolytic

capacitor should be placed from the input

to the ground.

Reducing Output Noise

It may be an advantage to reduce the AC

noise present at the output. One way is to re-

duce the regulator bandwidth by increasing

the size of the output capacitor. Increasing

the capacitor from 1µF to 220µF only de-

creases the noise from 430µV to 160µVrms

for a 100kHz bandwidth at 5V output.

APPLICATION INFORMATION

Top View

SPX1521

1 32

SOT-223 (M3)

Top View

TO-263-3 (T)

SPX1521

Front View

TO-220-3 (U)

SPX1521

1 2 3

Front View

TO-252 (R)

VIN GND VOUT

VOUT GND VIN

VOUT

GND

VIN

PINOUTS

Note: Tab is connected to GND

Thermal Resistance (Theta JA)

SOT-223 ------62.3ºC/W

TO-262 ------31.4ºC/W

TO-220 ------29.4ºC/W

TO-252 ------50.0ºC/W

PACKAGE: 3 PIN TO-263

PACKAGE: 3 PIN TO-220

PACKAGE: 3 PIN TO-252

PACKAGE: 3 PIN SOT223

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the ap-

plication or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

Sipex Corporation

Headquarters and

Sales Ofce

233 South Hillview Drive

Milpitas, CA 95035

TEL: (408) 934-7500

FAX: (408) 935-7600

ORDERING INFORMATION

Solved by

Part Number Package

Code RoHS Status Pack Type Pack Qty

SPX1521M3-L-3-3 SOT-223-3 ▪Active Tube 78

SPX1521M3-L-5-0 SOT-223-3 ▪Active Tube 78

SPX1521M3-L-5-0/TR SOT-223-3 ▪Active Tape & Reel 2500

SPX1521R-3-3 TO-252 EOL Tube 77

SPX1521T-L-5-0 TO-263-3 ▪EOL Tube 50

SPX1521R-3-3/TR TO-252 OBS Tape & Reel 2500

SPX1521R-5-0 TO-252 OBS Tube 77

SPX1521R-5-0/TR TO-252 OBS Tape & Reel 2500

SPX1521R-L-3-3 TO-252 ▪OBS Tube 77

SPX1521R-L-3-3/TR TO-252 ▪OBS Tape & Reel 2500

SPX1521R-L-5-0 TO-252 ▪OBS Tube 77

SPX1521R-L-5-0/TR TO-252 ▪OBS Tape & Reel 2500

SPX1521T-3-3 TO-263-3 OBS Tube 50

SPX1521T-3-3/TR TO-263-3 OBS Tape & Reel 500

SPX1521T-5-0 TO-263-3 OBS Tube 50

SPX1521T-5-0/TR TO-263-3 OBS Tape & Reel 500

SPX1521T-L-3-3 TO-263-3 ▪OBS Tube 50

SPX1521T-L-3-3/TR TO-263-3 ▪OBS Tape & Reel 500

SPX1521T-L-5-0/TR TO-263-3 ▪OBS Tape & Reel 500

SPX1521U-3-3 TO-220-3 OBS Tube 50

SPX1521U-5-0 TO-220-3 OBS Tube 50

SPX1521U-L-3-3 TO-220-3 ▪OBS Tube 50

SPX1521U-L-5-0 TO-220-3 ▪OBS Tube 50