spx2950acn-l-5-0-tr Exar Corporation, spx2950acn-l-5-0-tr Datasheet

spx2950acn-l-5-0-tr

Manufacturer Part Number

spx2950acn-l-5-0-tr

Description

Spx2951 -150ma Low Dropout Voltage Regulator

Manufacturer

Exar Corporation

Datasheet

1.SPX2950ACN-L-5-0-TR.pdf (13 pages)

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FEATURES

Block Diagram of SPX2951, 8 Lead 5V Version

The SPX2950 and SPX2951 are low power voltage regulators. These devices are an excellent choice for

use in battery-powered applications such as cordless telephones, radio control systems, and portable

computers. The SPX2950 and SPX2951 feature low quiescent current and low dropout voltage (typ. 20mV

at 100µA and 300mV at 150mA). This includes a tight initial tolerance of (0.5% for SPX2950A/SPX2951A),

extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20ppm/

°C typ.), making the SPX2950/SPX2951 useful as a low-power voltage reference.

The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling

voltage. The logic compatible shutdown feature enables the regulator to be switched ON and OFF. The

SPX2950 is offered in a 3-pin TO-92 package compatible with other 5.0V, 3.3V regulators. The SPX2951

is availiable in an 8-lead SOIC package.

DATE: 12/01/04

5.0V and 3.3V at 150mA Output

Accurate: 0.5% for SPX2950A/SPX2951A

Very Low Quiescent Current

Low Dropout Voltage: 300mV at 150mA

Extremely Tight Load and Line Regulation

Very Low Temperature Coefficient

Current & Thermal Limiting

Need Only 1µF for Stability

Offered in TO-92 (SPX2950) and SOIC

(SPX2951)

Direct Replacement for LP2950/LP2951

SPX2951 versions only

Error Flag Warns of Output Dropout

Logic-Controlled Electronic Shutdown

Output Programmable From 1.24 to 29V

FROM

CMOS OR

TTL

UNREGULATED DC

SPX2950/SPX2951 150mA Low Dropout Voltage Regulator

SHUTDOWN

150mA Low Dropout Voltage Regulator

FEEDBACK

60 mV

1.23V

REFERENCE

INPUT

ERROR

AMPLIFIER

APPLICATIONS

ERROR DETECTION

COMPARATOR

Now Available in Lead Free Packaging

Battery Powered Systems

Cordless Telephones

Radio Control Systems

Portable/Palm Top/Notebook Computers

Portable Consumer Equipment

Portable Instrumentation

Avionics

SMPS Post-Regulator

Voltage Reference

Automotive Electronics

SHUTDOWN

GROUND

OUTPUT

SENSE

OUTPUT

180kΩ

SPX2950/SPX2951

60kΩ

8-Pin Surface Mount (S)

SPX2951 Top View

GROUND

5V TAP

ERROR

SENSE

______

INPUT

FEEDBACK

5V or 3.3V Output

ERROR

OUT

TO CMOS OR

TTL

1µF

DESCRIPTION

SPX2950 Bottom View

330kΩ

GROUND

TO-92 (N)

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spx2950acn-l-5-0-tr Summary of contents

Page 1

FEATURES 5.0V and 3.3V at 150mA Output Accurate: 0.5% for SPX2950A/SPX2951A Very Low Quiescent Current Low Dropout Voltage: 300mV at 150mA Extremely Tight Load and Line Regulation Very Low Temperature Coefficient Current & Thermal Limiting Need Only 1µF for ...

Page 2

ABSOLUTE MAXIMUM RATINGS 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 ........................................................ -0.3V to +30V ELECTRICAL CHARACTERISTICS Electrical ...

Page 3

ELECTRICAL CHARACTERISTICS: Continued Electrical characteristics +1V the full operating temperature range. PARAMETER CONDITIONS Error Comparator Output Leakage Current V =30V 0H Output Low Voltage V =V -0. =400µA 0L Upper ...

Page 4

=50kΩ INPUT VOLTAGE (VOLTS) Dropout Characteristics 320 280 240 I = 1mA L 200 160 120 80 ...

Page 5

I = 150mA L 400 300 200 ~ ~ 100µ -75 -50 - 100 125 150 TEMPERATURE (ºC) Drop-Out Voltage OUT 6 4 HYSTERESIS 2 ...

Page 6

TEMPERATURE SPX2951 Minimum Operating Voltage 250 200 150 100 1µF -100 OUT ~ ~ 100 mA 100 ...

Page 7

TEMPERATURE (ºC) Shutdown Threshold Voltage 150 º 125 ...

Page 8

APPLICATION HINTS EXTERNAL CAPACITORS The stability of the SPX2950/SPX2951 requires a 1µF 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 be- low -25°C ...

Page 9

PROGRAMMING THE OUTPUT VOLTAGE OF SPX2951 The SPX2951 may be pin-strapped for 5V using its internal voltage divider by tying Pin 1 (out- put) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V Tap). Also, it may ...

Page 10

TYPICAL APPLICATIONS: (Continued 470KΩ ______ 5 IN ERROR 1 470kΩ V OUT SPX2951 GND RESET 7 4 Figure 3. Latch Off When Error Flag Occurs + 6V SEALED 1.5kΩ 120kΩ LEAD- ACID BATTERY ...

Page 11

TYPICAL APPLICATIONS: (Continued) 39kΩ RESET - C4 + 39kΩ 100kΩ 1% 1kΩ LEAD- ACID BATTERY 1kΩ 1% 10kΩ 20kΩ 1% Figure 6. Regulator with State-of Charge Indicator 3 AUX SHUTDOW SD INPUT OFF ON + TEMP ...

Page 12

TYPICAL APPLICATIONS: (Continued) 4 20mA OUT 1N4001 SPX2951 7 0.1µF FB GND 4 1N457 MIN VOLTAGE = 4V Figure 8. Open Circuit Detector for 4mA to 20mA Current Loop R11 18kΩ C1 ...

Page 13

... SPX2951ACS-5.0/TR SPX2951CS-3.3 SPX2951CS-3.3/TR SPX2951CS-5.0 SPX2951CS-5.0/TR Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX2950ACN-3.3/TR = standard; SPX2950ACN-L-3.3/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for 8 pin NSOIC and 2,000 for TO-92. CLICK HERE TO ORDER SAMPLES Corporation ANALOG EXCELLENCE ...

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