Datasheet SPX2950ACN-3.0, SPX2950ACN-3.3, SPX2950ACN-5.0, SPX2950CN-3.0, SPX2950CN-3.3 Datasheet (Sipex Corporation)

FEATURES

5.0V, 3.3V, and 3.0V Versions at 150mA Output

•

Very Low Quiescent Current

•

Low Dropout Voltage

•

Extremely Tight Load and Line Regulation

•

Very Low Temperature Coefficient

•

Needs Only 1µF for Stability

•

Current & Thermal Limiting

•

Unregulated DC Input can Withstand -20V Reverse Battery

•

and +60V Positive Transients

Similar Replacement With Higher I

•

OUT

for LP2950/LP2951 Sockets

SPX2951 Versions Only

Error Flag Warns of Output Dropout

•

Logic-Controlled Electronic Shutdown

•

Output Programmable From 1.24V to 29V

•

SPX2950/SPX2951

150mA Low Dropout Voltage Regulators

APPLICATIONS

Battery Powered Systems

•

Cordless Telephones

•

Radio Control Systems

•

Portable/Palm Top/Notebook Computers

•

Portable Consumer Equipment

•

Portable Instrumentation

•

Avionics

•

Automotive Electronics

•

SMPS Post-Regulator

•

Voltage Reference

•

PRODUCT DESCRIPTION

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 very low quiescent current and very low dropout voltage (Typ. 50mV at light load and 380mV at 100mA). This include a tight initial tolerance of 0.5% typ., extremely good load and line regulation of 0.05% typ. and very low output temperature coefficient, making the SPX2950/SPX2951 useful as a low-power voltage reference. Other key additional features of this device includes higher output current (150mA), positive transient protection up to 60V (Load dump), and the ability to survive an unregulated input voltage transient of -20V below ground (reverse battery).

The error flag output feature is used as power-on reset for warning of a low output voltage, due to falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched ON and OFF. The SPX2950 is offered in a 3-Pin TO-92 package compatible with other 5V regulators. The SPX2951 is also available in 8-Pin Plastic, SO-8 and TO-99 metal can packages.

The regulator output voltage may be pin-strapped for a 5V, 3.3V and 3.0V or programmed from 1.24V to 29V with an external pair of resistors. Look for SPX2954 for 250mA and SPX2955 for 350mA.

OUTPUT

SENSE

SHUTDOWN

GROUND

PIN CONNECTIONS

8-Pin Surface Mount

1

8

2

7

ALPHA

SPX2951

AS2930

3

6

4

5

Top View

INPUT

FEEDBACK

5V or 3.3V TAP

ERROR

TO-92 (N)

132

V

OUT

GND

Bottom View

V

IN

Rev. 10/30/00

SPX2950/SPX2951

O

ABSOLUTE MAXIMUM RATINGS

Power Dissipation..........................................Internally Limited Input Supply Voltage (Survival) .........................-20 to +60V

Lead Temp. (Soldering, 5 Seconds) ................................ 260°C Feedback Input Voltage .....................................-1.5 to +30V

Storage Temperature Range ......................... -65°C to +150°C Shutdown Input Voltage.....................................-0.3 to +30V

Operating Junction Temperature Range Error Comparator Output...................................-0.3 to +30V

SPX2951................................................ -55°C to +150°C ESD Rating .............................................................2KV Min

SPX2950AC/SPX2950C

SPX2951AC/SPX2951C ....................... -40°C to +125°C

ELECTRICAL CHARACTERISTICS

3.0V Version

Output Voltage

3.3V Version

Output Voltage

5.0V Version

Output Voltage

All Voltage Options

Output Voltage Temperature Coefficient

Line Regulation (Note 3) 6V < VIN < 30V (Note 4)

Load Regulation (Note 3) 100mA < IL < 150mA

Dropout Voltage (Note 5)

Ground Current

Current Limit V

Thermal Regulation

Output Noise, 10Hz to 100KHz

8-Pin Version Only SPX2951 SPX2951AC SPX2951C

Reference Voltage

= 25°C

T

J

-25°C <

TJ < 85°C

Full Operating Temperature

100mA < IL < 150mA T

< T

JMAX

= 25°C

TJ < 85°C

< T

JMAX

= 25°C

TJ < 85°C

IL < 150mA

< T

JMAX

= 150mA

= 0

OUT

= 1µF = 200µF = 13.3µF

J

T

J

-25°C < Full Operating Temperature

100mA < IL < 150mA T

J

T

J

-25°C < Full Operating Temperature

100µA < T

J

(Note 1)

IL = 100µA

IL = 100mA

I

L

IL = 100µA

IL = 100mA

I

L

C

L

C

L

C

L

(bypass = 0.01µF pins 6 to 1 (SPX2951)

ver Temperature (Note 6)

at VS=15V, TA=25°C, unless otherwise specified.

Min Typ Max Min Typ Max Min Typ Max

2.985

2.964

2.955 3.0 3.045 2.958 3.0 3.042 2.928 3.0 3.072

3.284

3.260

3.251 3.3 3.350 3.254 3.3 3.346 3.221 3.3 3.379

4.975

4.94

4.925 5.0 5.075 4.93 5.0 5.07 4.88 5.0 5.12

20 120 20 50

0.03 0.1 0.03 0.1 0.04 0.2

0.04 0.1 0.04 0.1 0.1 0.2

50

150

130 200 130 200 130 200

0.05 0.2 0.05 0.2 0.05 0.2

430

1.22 1.235 1.25 1.22 1.235 1.25 1.21 1.23 1.26

1.19 1.27 1.19 1.27 1.18 1.28

SPX2951 SPX2950C/SPX2951C SPX2950C/SPX2951C UNITS PARAMETER CONDITIONS

3.0 3.015

3.036

3.3 3.317

3.340

5.0 5.025

5.06

80

380

450

3

5

160

100

450

500

170

6

8

430

2.985

2.970

2.964

3.284

3.267

3.260

4.975

4.95

4.94

50

150

3.0

3.3

5.0

380

450

3

5

160

100

3.015

3.030

3.036

3.317

3.333

3.340

5.025

5.050

5.06

80

450

500

170

6

8

430

2.970

2.955

2.940

3.267

3.251

3.234

4.95

4.925

4.90

50

150

3.0

3.3

5.0

380

450

3

5

160

100

3.030

3.045

3.060

3.333

3.350

3.366

5.05

5.075

5.10

80

450

500

170

6

8

ppm/

mV

µ

mA mA

mA

%/W

Vrms

µ

Vrms

µ

Vrms

µ

V

°

C %

%

A

V

Rev. 10/30/00

SPX2950/SPX2951

PARAMETER

8-Pin Version only (Continued)

Feedback Pin Bias Current 40 60 40 60 40 60 nA

Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient

Error Comparator

Output Leakage Current V

Output Low Voltage VIN = 4.5V

Upper Threshold Voltage (Note 8) 40 60 40 60 40 60 mV

Lower Threshold Voltage (Note 8) 75 95 75 95 75 95 mV

Hysteresis (Note 8) 15 15 15 mV

Shutdown Input

Input logic Voltage Low (Regulator ON)

Shut down Pin Input Current VS = 2.4V

Regulator Output Current in Shutdown

Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 1:

Unless otherwise specified all limits guaranteed for T

Note 2:

feedback tied to 5V Tap and output tied to output sense (V

Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are

Note 3:

covered under the specification for thermal regulation.

Line regulation for the SPX2951 is tested at 150°C for I

Note 4:

typical performance characteristics for line regulation versus temperature and load current.

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 at

Note 5:

very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.

V

Note 6: Note 7: Note 8:

REF

Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.

Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of V V

is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

OUT

V

Note 9: Note 10:

SHUTDOWN

All typical values are not guaranteed. The value could vary from lot to lot.

≤ (VIN - 1V), 2.3 ≤V

V

≤

OUT

≥ 2V, VIN ≤ 30V, V

BLOCK DIAGRAM

CONDITIONS

(Note 2)

Min Typ Max

20 20 50 ppm/°C

SPX2951

SPX2950AC

SPX2951AC Min Typ Max

SPX2950C

SPX2951C Min Typ Max

UNITS

( Note 7 )

0.1 0.1 0.1 nA/°C

= 30V 0.01 1 0.01 1 0.01 1

OH

A

µ

150 250 150 250 150 250 mV

IOL = 400µA

High (Regulator OFF)

2

30

V

= 30V

S

(Note 9) 3 10 3 10 3 10

= 25°C, VIN = 6V, IL = 100 µA and CL = 1 µF. Additional conditions for the 8-pin versions are

J

= 5V) and V

OUT

= 1 mA. For IL = 100 µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See

L

30V, 100µA≤I

≤

IN

=0, Feedback pin tied to 5V Tap.

OUT

+

FROM CMOS OR TTL

150 mA, T

≤

L

UNREG ULAT ED DC

3

SHUTDO WN

1.3 0.6 2 1.3 0.7 2 1.3 0.7 V

50

675

SHUTDOWN

T

≤

J

JMAX

7

FEEDBACK

60 mV

SPX2950 and SPX2951 Block

≤ 0.8V.

.

800

+

1.23V

+

REFERENC

30

OUT/VREF

8

INPUT

+ _

ERROR AMPL IFIER

+

_

ERROR COMPARATOR

675

50

800

30

675

800

50

= (R1 + R2)/R2. For example, at a programmed output

1

OUTPUT

2

SENSE

ΩΩΩΩ

180k

..

ΩΩΩΩ

60k

..

5V TAP

______

ERROR

6

5

4

GROUND

5V @ 150mA

+

TO CMOS TTL

MAX

330k

µµµµ

.. 1 F

OUT

as

ΩΩΩΩ

V

A

µ

A

µ

A

µ

..

Rev. 10/30/00

SPX2950/SPX2951

APPLICATION HINTS

EXTERNAL CAPACITORS

The stability of the SPX2950/SPX2951 requires a 1.0µF 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 below 25°C solid tantalum is recommended since 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. At lower values of output current, less output capacitance is required for stability. For the currents below 10mA the value of the capacitor can be reduced to 0.5µF and 0.15µF for 1mA. More output capacitance is needed for the 8-pin version at voltages below 5V since it runs the error amplifier at lower gain. At worst case 5µF or greater must be used for the condition of 150mA load at 1.23V output. The SPX2950, unlike other low dropout regulators will remain stable in regulation with no load in addition to the internal voltage divider. This feature is especially important in applications like CMOS RAM keep-alive. When setting the output voltage of the SPX2951 version with external resistors, a minimum load of 1uA is recommended. 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 1µA tantalum or aluminum electrolytic capacitor should be placed from the input to the ground. Instability can occur if there is stray capacitance to the SPX2951 feedback terminal (pin 7). This could cause more problems when using a higher value of external resistors to set the output voltage. This problem can be fixed by adding a 100pF capacitor between output and feedback and increasing the output capacitor to at least 3.3µF.

ERROR DETECTION COMPARATOR OUTPUT

The Comparator produces a logic low output whenever the SPX2951 output falls out of regulation by more than around 5%. This is around 60mV offset divided by the 1.235 reference voltage. This trip level remains 5% below normal regardless of the programmed output voltage of the regulator. Figure 1 shows the timing diagram depicting the ERROR signal and the regulator output voltage as the SPX2951 input is ramped up and down. The ERROR signal becomes low at around 1.3V input, and goes high around 5V input (input voltage at which V

= 4.75 ).

OUT

Since the SPX2951’s dropout voltage is load dependent, the input voltage trip point (around 5V) will vary with the load current. The output voltage trip point (approx. 4.75V) does not vary with load.

. The error comparator has an open-collector output which requires an external pull-up resistor. Depending on the system requirements the resistor may be returned to 5V output or other supply voltage in determining the value of this resistor, note that the output is rated to sink 400µA, this value adds to battery drain in a low battery condition. Suggested values range from 100K to 1MΩ. If the output is unused this resistor is not required.

PROGRAMMING THE OUTPUT VOLTAGE OF SPX2951

The SPX2951 may be pin-strapped for 5V using its internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V Tap). Also it may be programmed for any output voltage between its 1.235V reference and its 30V maximum rating . As seen in Figure 2, an external pair of resistors is required. Refer to the below equation for the programming of the output voltage.

V

The V

is 1.235 and IFB is the feedback bias current, nominally

REF

-20 nA. The minimum recommended load current of 1µA forces an upper limit of 1.2 MΩ on value of R2. If no load presented the IFB produces an error of typically 2% in V room temperature by trimming R the value of R

= 100k this reduces the error by 0.17% and increases

2

the resistor program current by 12µA. Since the SPX2951 typically draws 60µA at no load with Pin 2 open-circuited this is a small price to pay.

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. This is the only way that noise can be reduced on the SPX2950 but is relatively inefficient, as increasing the capacitor from 1µF to 220 µF only decreases the noise from 430µV to 160µV

. for a 100kHz bandwidth at 5V output.

RMS

Noise could also be reduced fourfold by a bypass capacitor across R since it reduces the high frequency gain from 4 to unity. Pick

or choose 0.01µF. When doing this, the output capacitor must be increased to 3.3µF to maintain stability. These changes reduce the output noise from 430µV to 100µV 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages.

OUT

C

= V

BYPASS

× ( 1 + R1/R2 )+ IFBR

REF

which may be eliminated at

OUT

. To improve the accuracy choose

1

1 / 2πR

≅

× 200 Hz

1

. for a 100kHz bandwidth at

RMS

,

1

Rev. 10/30/00

SPX2950/2951

TYPICAL PERFORMANCE CHARACTERISTICS

DROPOUT CHARACTERISTICS

6

5

4

RL=50k

3

2

OUTPUT VOLTAGE (VOLTS)

1

0

123 456

INPUT VOLTAGE (VOLTS)

OUTPUT VOLTAGE VS. TEMP OF 3

5.06

REPRESENTATIVE UNITS

5.04

5.02

5.0

4.98

OUTPUT VOLTAGE (V)

4.96

4.94

-75

-25 0 25 50 75 100 125 150

-50

TEMPERATURE (ºC)

GROUND CURRENT

16

12

8

GROUND CURRENT (mA)

4

-75

-25 0 25 50 75 100 125 150

-50

TEMPERATURE (ºC)

Ω

0.2%

VIN = 6V

I

= 100mA

L

RL=50k

250

INPUT CURRENT

10

QUIESCENT CURRENT

225

200

175

150

RL = 50k

Ω

1

125

Ω

100

75

INPUT CURRENT (µA)

50

RL =

8

0.1

GROUND PIN CURRENT (mA)

25

0

123

INPUT VOLTAGE (VOLTS)

GROUND CURRENT

320

280

240

200

160

120

80

GROUND CURRENT (µA)

40

0

123456

INPUT VOLTAGE (VOLTS)

GROUND CURRENT

16

10 150

IL= 1mA

IL= 0

7

8

0.01

0.1 1 10 150

LOAD CURRENT (mA)

160 150 140 130 120 110 100

90 80 70 60 50

INPUT CURRENT (mA)

40 30 20 10

0

240

INPUT CURRENT

12345678910

INPUT VOLTAGE (VOLTS)

QUIESCENT CURRENT

RL=50

Ω

14

12

10

8

6

GROUND CURRENT

4

2

0

1

IL=100mA

2345678

INPUT VOLTAGE

220

200

QUIESCENT CURRENT (µA)

180

-75

-25 0 25 50 75 100 125 150

-50

TEMPERATURE (ºC)

VIN=6V

I

=100mA

L

DROP-OUT VOLTAGE

600

500

400

300

~ ~

100

DROP-OUT VOLTAGE (mV)

50

0

-75

-25 0 25 50 75 100 125 150

-50

TEMPERATURE (ºC)

IL = 100mA

IL = 100µA

DROP-OUT VOLTAGE

500

400

300

200

100

0

TJ = 25ºC

1mA100µA

OUTPUT CURRENT

DROP-OUT VOLTAGE (mV)

10mA

100mA

SHORT CIRCUIT CURRENT

170

160

150

140

130

120

SHORT CIRCUIT CURRENT (mA)

110

-75 -50 -25 0 25 50 75 100 125 150

TEMPERATURE (ºC)

Rev. 10/30/00

SPX2950/SPX2951

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

ERROR COMPARATOR OUTPUT

8

V

= 5V

OUT

6

4

HYSTERESIS

2

COMPARATOR OUTPUT (V)

0

PULLUP RESISTOR TO

-2

10

5

2

1

SEPARATE 5V SUPPLY

123 45

0

INPUT VOLTAGE (V)

OUTPUT IMPEDANCE

IO = 100µA

IO = 1mA

IO = 100mA

0.5

0.2

0.1

0.05

OUTPUT IMPEDANCE (OHMS)

0.02

0.01 10 100 1K 10K 100K 1M

FREQUENCY (Hz)

SPX2951 MINIMUM OPERATING VOLTAGE

10

1

0.1

MINIMUM OPERATING VOLTAGE (V)

0.01

-75 0 75 150

-50 -25 25 50 100 125 -25 25 125 0 0.5

TEMPERATURE

LOAD TRANSIENT RESPONSE

250

200

150

100

50

0

-50

-100

~ ~

CURRENT CHANGE (mV)

100

LOAD OUTPUT VOLTAGE

mA

100

µA

CL = 1µF

V

OUT

012345

TIME (ms)

V

C

= 5V

OUT

L

= 5V

= 1µF

SPX2951 COMPARATOR SINK CURRENT

2.5

2.0

1.5

1.0

SINK CURRENT (mA)

0.5

0.0

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

0.1

OUTPUT LOW VOLTAGE (V)

RIPPLE REJECTION

90

80

70

60

50

40

RIPPLE REJECTION (dB)

CL = 1µF

VIN = 6V

30

V

= 5V

OUT

20

10110210310410510

FREQUENCY (Hz)

SPX2951

FEEDBACK BIAS CURRENT

20

10

0

-10

BIAS CURRENT (nA)

-20

-30

-75

-50 0 50 75 100 150

TEMPEATURE (ºC)

LOAD TRANSIENT RESPONSE

80

60

40

20

0

-20

-40

-60

~ ~

CURRENT CHANGE (mV)

LOAD OUTPUT VOLTAGE

100

µA

100

µA

CL = 1µF

V

048121620

TIME (ms)

TA = 125ºC

TA = 25ºC

TA = -55ºC

IL = 0

OUT

IL = 100µA

= 5V

LINE TRANSIENT RESPONSE

100

mV

50 mV

0

-50 mV

~ ~

8V

VOLTAGE CHANGE

INPUT OUTPUT VOLTAGE

6V

CL = 1µF IL = 1mA

V

OUT

= 5V

4V

0 200

400 600 800

TIME(µs)

RIPPLE REJECTION

90

80

70

IL = 10mA

CL= 1µF

VIN = 6V

V

OUT

= 5V

60

50

40

RIPPLE REJECTION (dB)

30

20

6

1

10

50

PIN 7 DRIVEN BY EXTERNAL SOURCE (REGULATOR RUN

0

-50

TA =1 25ºC

IL = 10mA

2

10

FREQUENCY (Hz)

SPX2951 FEEDBACK PIN CURRENT

OPEN LOOP)

4

3

10

5

6

10

-100

-150

FEEDBACK CURRENT (µA)

-200

-250

-1.5 -1.0

-2.0 -0.5 1.0

TA = 25ºC

TA = 55ºC

FEEDBACK VOLTAGE (V)

ENABLE TRANSIENT

7

6

5

4

3

2

1

0

SHUTDOWN OUTPUT

2

PINOUT VOLTAGE (V) VOLTAGE (V)

0

CL = 10µF V

IL = 10mA

VIN = 8V

= 5V

OUT

-2

-100 0 100 20 0 300 400 500 600 700

TIME

Rev. 10/30/00

SPX2950/SPX2951

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

SPX2950 MAXIUM RATED OUTPUT

120

100

80

60

0.25" LEADS SOLDERED

TO-92 PACKAGE

TO PC BOARD

T

= 125 ºC

JMAX

Ω)

Ω)Ω)

Ω)

SPX2951 DIVIDER RESISTANCE

400

300

200

40

OUTPUT CURRENT (mA)

SHUTDOWN THRESHOLD VOLTAGE (V)

TA = 85 ºC

20

0

010 20 30

INPUT VOLTAGE (V)

SHUTDOWN THRESHOLD VOLTAGE

1.8

1.6

1.4

1.2

1.0

0.8

0.6

-75

-50 -25 0 25 50 75 100 125 150

TEMPERATURE (ºC)

OUTPUT VOLTAGE CHANGE (mV)

TA=25 ºC

25155

LINE REGULATION

30

25

20

15

TJ = 150 ºC

10

5

0

~

10

TJ = 125 ºC IL = 100µA

5

0

-5

-10

5

10 15 20 25 30

INPUT VOLTAGE (V)

100

PIN 2 TO PIN 4 RESISTANCE (k

0

-75 0 75 150

-50 -25 25 50 100 125

TEMPERATURE (ºC)

THERMAL RESPONSE

5

4

2

0

-2 ~

~

1

POWER OUTPUT VOLTAGE

0

DISSIPATION (W) CHANGE (mV)

-1

0

10 20 30 40 50

IL = 100µA

IL = 1mA

1.25W

TIME (µs)

80

IL = 50µA

70

60

IL = 100mA

50

40

CL = 1µF

VIN = 6V

30

V

RIPPLE REJECTION (dB)

20

10

= 5V

OUT

1

2

10

VOLTAGE NOISE

RIPPLE REJECTION

10310

FREQUENCY (Hz)

SPX2950 MAXIUM RATED OUTPUT

120

100

80

60

40

OUTPUT CURRENT (mA)

20

0

3.5

3.0

2.5

2.0

1.5

1.0

SPECTRAL DENSITY (µV/Hz)

0.5

0.0

2

10

4

10

CURRENT

TA = 50ºC

TA = 85ºC

510 1520 2530

INPUT VOLTAGE (V)

OUTPUT NOISE

CL = 220µF

CL = 3.3µF

3

10

FREQUENCY (Hz)

6

5

10

8-PIN MOLDED

DIP SOLDERED

TO PC BOARD

T

= 125º C

JMAX

V

= 5V

OUT

TA = 25ºC

IL = 100mA

CL = 1µF

4

10

5

10

Rev. 10/30/00

SPX2950/SPX2951

TYPICAL APPLICATIONS

+V

SPX2951

GND

4

______ ERROR

SD

GND

IN

8

+V

IN

V

OUT

FB

7

1.23V

V

REF

+V

IN

8

+V

IN

SPX2951

4

1.2 to 30V

1

R

1

+

.01uF

3.3uF

R

2

*V

= V

1

V

OUT

FB

7

OUT

IN

4.75V

OUTPUT

VOLTAGE

_______ ERROR*

INPUT

VOLTAGE 1.3V

* See Application Info.

+

Figure 1. ERROR Output Timing

470K

ΩΩΩΩ

470K

Latch Off When Error Flag Occurs

100K

3

5

______ ERROR

SD

+

5.0V

+

ERROR

OUTPUT

SHUTDOWN

INPUT

+

Figure 2. Adjustable Regulator

_______

+V

IN

..

______

5

ERROR

ΩΩΩΩ

..

3

SD

8

+V

IN

SPX2951

GND

4

V

FB

OUT

7

V

1

R

OUT

+

1

2

1uF

ERROR

OUTP UT

SHUTDOWN

INPUT

MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 4mV to 400mV.

*

DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 160mA

5

3

Wide Input Voltage Range Current Limiter

Rev. 10/30/00

SPX2950/SPX2951

TYPICAL APPLICATIONS (Continued)

+

FOR 5.5 V

6V SEALED LEADACID BATTERY SOURCE

1.5K

ΩΩΩΩ

..

39k

100k

1k

10k

ΩΩΩΩ

20k

1N457

..

8

+V

IN

5

ERROR

2

SENSE

V

OUT

SPX2951

3

SD

ΩΩΩΩ

GND

ΩΩΩΩ

4

-

C1

+

-

C2

+

-

C3

+

FB

TAP

6

ΩΩΩΩ

100k

ΩΩΩΩ

100k

ΩΩΩΩ

100k

*OPTIONAL LATCH OFF WHEN DROPOUT OCCURS. ADJUST R3 FOR C2 SWITCHING V **OUTPUTS GO LOW WHEN V DESIGNATED THRESHOLDS.

120K

FB

400K

39k

-

C4

+

6V LEADACID

BA TTERY

ΩΩΩΩ

..

SPX385

ΩΩΩΩ

..

ΩΩΩΩ

RESET

1%

R

3

1%

100K

Regulator with State-of-Charge Indicator

8

+V

IN

SPX2951

SENSE

3

SD

GND

4

Low Battery Disconnect

=

OUT

+

1

<5.8V**

<6.0V**

µµµµ

5V

F

DROPS BELOW

IN

+V

1

7

<6.2V**

V

OUT

IS 6.0V.

IN

1

2

+

1uF

MAIN V-

MEMORY V+

20K

ΩΩΩΩ

..

NI-CAD BACKUP BATTERY

Rev. 10/30/00

SPX2950/SPX2951

TYPICAL APPLICATIONS

AUX SHUTDOW

ON

TEMP SENSOR

4

20mA

8

+V

IN

1N4001

0.1uF

SPX2951

GND

4

Open Circuit Detector for 4mA to 20mA Current Loop

(continued)

OFF

+

AS35

-

1

V

OUT

7

FB

1N457

MIN VOLTAGE = 4V

+V

IN

8

+V

IN

_______

5

3

SD

GND

SPX2951

4

ERROR

V

OUT

FB

7

8.2K

1

ΩΩΩΩ

..

System Over Temperature Protection Circuit

+5V

4.7mA

OUTPUT

2

ΩΩΩΩ

..

360K

10K

ΩΩΩΩ

..

5 DEGREE SHUTDOWN

UNREGULATED INPUT

EXTERNAL CIRCUIT PROTECTED OVER (V+ GOES OFF TEMP > 125)

5

IN

3

V

300 mA Regulator with 0.75 Dropout

TAP

FB

7

SPX2951

GND

V

OUT

SENSE

4

OR

RELAY

ΩΩΩΩ

330K

27K

..

ΩΩΩΩ

..

+

4.7uF

5V

OUTPUT

LOAD 50mA TO 300 mA

2N5432

1

2

Rev. 10/30/00

SPX2950/SPX2951

SCHEMATIC DIAGRAM

Rev. 10/30/00

SPX2950/SPX2951

ORDERING INFORMATION

Ordering No. Precision Output Voltage Packages

SPX2950CN-3.0 SPX2950CN-3.3 SPX2950CN-5.0 SPX2950ACN-3.0 SPX2950ACN-3.3 SPX2950ACN-5.0 SPX2951CS-3.0 SPX2951CS-3.3 SPX2951CS-5.0 SPX2951ACS-3.0 SPX2951ACS-3.3 SPX2951ACS-5.0

1% 3.0V 3 Lead TO-92 1% 3.3V 3 Lead TO-92 1% 5.0V 3 Lead TO-92

0.5% 3.0V 3 Lead TO-92

0.5% 3.3V 3 Lead TO-92

0.5% 5.0V 3 Lead TO-92 1% 3.0V 8 Lead SOIC 1% 3.3V 8 Lead SOIC 1% 5.0V 8 Lead SOIC

0.5% 3.0V 8 Lead SOIC

0.5% 3.3V 8 Lead SOIC

0.5% 5.0V 8 Lead SOIC

SIGNAL PROCESSING EXCELLENCE

Corporation

Sipex Corporation

Headquarters and Main Offices:

22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com

233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 935-7600 FAX: (408) 934-7500

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 hereing; neither does it convey any license under its patent rights nor the rights of others.

Rev. 10/30/00

Datasheet SPX2950ACN-3.0, SPX2950ACN-3.3, SPX2950ACN-5.0, SPX2950CN-3.0, SPX2950CN-3.3 Datasheet (Sipex Corporation)

Specifications and Main Features

Frequently Asked Questions

User Manual