SPX1521M3-L-3.3 - Sipex Corporation

1

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

®

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 coefficient, 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

Now Available in Lead Free Packaging

DESCRIPTION

+2.2µF

+

SPX1521

I

IN

I

G

I

L

5V

IN OUT

GND

LOAD

I

IN

= I

L

+ I

G

V

OUT

0.1µF

TYPICAL APPLICATIONS CIRCUIT

123

SPX1521

3 Pin TO-263

GND V

IN

V

OUT

2

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

ABSOLUTE MAXIMUM RATINGS

Electrical characteristics at VIN = 6V, IO = 1mA, COUT = 2.2µF, TA= 25°C, unless otherwise specified. Boldface applies over

the full operating temperature range.

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 Coefficient (Note1)

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

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

30

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 26

IL=300mA 514

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 coefficients defined as the worst case voltage change divided by

the total temperature range.

Note 2: Unless otherwise specified 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 specification 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 defined as the input to output differential at which the output voltage drops 100 mV below

its nominal value measured at 1V differential.

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

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

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

ELECTRICAL CHARACTERISTICS

3

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 fine 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 capaci-

tor. The capacitor value can be increased with-

out limit.

The SPX1521, unlike other low dropout regula-

tors will remain stable and in regulation with no

load in addition to the internal voltage divider.

This feature is especially important in applica-

tions like CMOS RAM keep-alive.

If there is more than 10 inches of wire between

the input and the AC filter 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 reduce the

regulator bandwidth by increasing the size of

the output capacitor. Increasing the capacitor

from 1µF to 220µF only decreases the noise

from 430µV to 160µVrms for a 100kHz band-

width at 5V output.

APPLICATION INFORMATION

Top View

SPX1521

132

SOT-223 (M3)

Top View

TO-263-3 (T)

1

SPX1521

23

Front View

TO-220-3 (U)

SPX1521

123

Front View

TO-252 (R)

3

2

1

V

IN

GND V

OUT

V

OUT

GND V

IN

V

OUT

GND V

IN

V

OUT

GND

V

IN

PINOUTS

4

E

D

L1

b2

e

b

.160 - .190

.000 - .010

Dimensions in inches

3-PIN TO-263

JEDEC TO-263

(AA) Variation

.020 - .039

.015 - .029

.070 - .110

-

- -

A

A1

b

c

D

E

E1

L

L1

L2

MIN NOM MAX

e .100 BSC

.066

-

.330 - .380

D1 .270 - -

.380 - .420

.245 -

-

H.575 - .625

.070

L3 .010 BSC

123

c

C2

A

H

SEATING PLANE

L

0º-8º

See View C

E/2

View C

GAUGE PLANE

A1

SEATING

PLANE

c

WITH PLATING

BASE METAL

b

SECTION B-B

BB

3 PIN TO-263

PACKAGE: 3 PIN TO-263

5

H1

B

SEATING

PLANE

A1

A

CHAMFER

OPTIONAL

C

A2

A

E

øP

Q

D

D1

E2 E/2

L

L1

CCDD

b

c

WITH PLATING

BASE METAL

b

CONTACT AREA

1

e

e1

.140 - .190

.020 - .055

Dimensions in

(mm)

3 PIN TO-220

JEDEC TO-220

(AB) Variation

.080 - .115

.015 .027 .040

.045 - .070

.480 - .507

A

A1

A2

b

b2

D1

D2

.380 - .420

E

MIN NOM MAX

c.014 - .024

D.560 - .650

.330 - .355

E1

.270 -.350

E2 - - .030

e.100 BSC

e1 .200 BSC

H1 .230 - .270

L1 - - .250

L2 - - -

∆P.139 - .161

Q.100 - .135

3 PIN TO-220

PACKAGE: 3 PIN TO-220

6

E1

E1/2

D1

Dimensions in inches

3 PIN TO-252

JEDEC TO-252

(AA) Variation

.018 - .024

c

MIN NOM MAX

A1 - - .005

D1 .205 - -

E1

H

L

L1

L2

.370 - .410

.170 - -

.055 .060 .070

.108 REF

.020 BSC

c

WITH PLATING

BASE METAL

b

CONTACT AREA

SEATING PLANE

C

A1

(L1)

L

c

GAUGE PLANE

O

L2

3 PIN TO-252

PACKAGE: 3 PIN TO-252

7

PACKAGE: 3 PIN SOT223

See detail

A

C

b2

c

GAUGE

PLANE

SEATING

PLANE

H

A

A1

L

C

0

E

D

1

e

E1

CC

N

BB

b2

b

Section C-C

- - 1.80

0.02 - 0.10

Dimensions in (mm)

3 PIN SOT-223

JEDEC TO-261

(AA) Variation

6.50

6.70 7.00 7.30

A

A1

D

E

E1

e

L

MIN NOM MAX

c

0.23 0.30 0.35

6.30 6.70

ø0º -10º

A2 1.50 1.60 1.70

0.66 0.76 0.84

b

b2 2.90 3.00 3.10

3.30 3.50 3.70

2.30 BASIC

e1 4.60 BASIC

0.75 - -

c

WITH PLATING

BASE METAL

b

Section B-B

3 PIN SOT-223

8

Corporation

ANALOG EXCELLENCE

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

application 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 Office

233 South Hillview Drive

Milpitas, CA 95035

TEL: (408) 934-7500

FAX: (408) 935-7600

ORDERING INFORMATION

Part Number Accuracy Output Voltage Packages

SPX1521M3-3.3 1% 3.3V 3-Pin SOT-223

SPX1521M3-3.3/TR 1% 3.3V 3-Pin SOT-223

SPX1521M3-5.0 1% 5.0V 3-Pin SOT-223

SPX1521M3-5.0/TR 1% 5.0V 3-Pin SOT-223

SPX1521R-3.3 1% 3.3V 3-Pin TO-252

SPX1521R-3.3/TR 1% 3.3V 3-Pin TO-252

SPX1521R-5.0 1% 5.0V 3-Pin TO-252

SPX1521R-5.0/TR 1% 5.0V 3-Pin TO-252

SPX1521T-3.3 1% 3.3V 3-Pin TO-263

SPX1521T-3.3/TR 1% 3.3V 3-Pin TO-263

SPX1521T-5.0 1% 5.0V 3-Pin TO-263

SPX1521T-5.0/TR 1% 5.0V 3-Pin TO-263

SPX1521U-3.3 1% 3.3V 3-Pin TO-220

SPX1521U-5.0 1% 5.0V 3-Pin TO-220

Available in lead free packaging. To order add "-L" suffix to part number.

Example: SPX1521T-3.3/TR = standard; SPX1521T-L-3.3/TR = lead free

/TR = Tape and Reel

Pack quantity is 500 for TO-263 2,000 for TO-252 and 2,500 for SOT-223.