Datasheet SPX2431L Datasheet (Sipex)

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®

Precision Adjustable Shunt Regulator

SPX2431L

FEATURES

■ Trimmed Bandgap to 0.5% and 1.0%

■ Wide Operating Current 160µA to 100mA

■ Extended Temperature Range:

0°C to 105°C

■ Low Temperature Coefficient 30 ppm/°C

■ Offered in TO-92, SOIC, SOT-23-3

■ Replacement for TL431 and AS2431L

APPLICATIONS

■ Battery Operating Equipment

■ Adjustable Supplies

■ Switching Power Supplies

■ Error Amplifiers

■ Single Supply Amplifier

■ Monitors / VCRs / TVs

■ Personal Computers

■ Low Cost Solution

DESCRIPTION

The SPX2431L is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference (0.5%) and extremely low operating current (100µA). The SPX2431L acts as an open-loop error amplifier with a 2.5V temperature compensated reference. The SPX2431L's thermal stability, wide operating current (100mA) and temperature range (0°C to 150°C) makes it suitable for a variety of applications. SPX2431LA tolerance of 0.5% is proven to be sufficient to overcome all the other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly lines and contributes a significant cost savings. In the standard shunt configuration, the combination of a low temperature coefficient, sharp turn on characteristics, low output impedance, and programmable output voltage makes this precision reference an excellent error amplifier. The SPX2431L is available in TO-92, SOIC-8, and SOT-23-3 package.

BLOCK DIAGRAM

Cathode (K)

Reference (R)

2.5V

+

-

Anode (A)

1

ABSOLUTE MAXIMUM RATINGS

Cathode-Anode Reverse Breakdown VKA....................................... 20V

Anode-Cathode Forward Current, (<10ms) I

Operating Cathode Current IKA.................................................. 100mA

Reference Input Current I Continuos Power Dissipation at 25°C P

TO-92 ..................................................................... 775mW

SOT-23 .................................................................. 200 mW

SOIC-8 .................................................................... 750mW

Junction Temperature T Storage Temperature T

Lead Temperature (Soldering 10 sec.) TL..................................300°C

NOTE: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

....................................................... 1.0mA

REF

...........................................................150 °C

J

.............................................. -65 to 150 °C

STG

................................. 1A

AK

D

RECOMMENDED CONDITIONS

PARAMETER SYMBOL RATING UNIT

Cathode Voltage V Cathode Current I

V

KA K

to 20 V

REF

10 mA

TYPICAL THERMAL RESISTANCES

PACKAGE

TO-92 160°C/W 80°C/W 6.3 mW/°C SOT-23 575°C/W 150°C/W 1.7 mW/°C SOIC-8 175°C/W 45°C/W 5.7 mW/°C

Typical deratings of the thermal resistances are given for ambient temperature >25°.

0

JA

0

TYPICAL DERATING

JC

ELECTRICAL CHARACTERISTICS

Electrical characteristics at 25°C IK = 10mA VK = V

PARAMETER SYMBOL FIGURE CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

Reference Voltage V

∆V

withTemp.* TC 2 0.07 0.20 0.07 0.20 mV/°C

REF

Ratio of Change in V to Cathode Voltage ∆V

Reference Input Current I I

Temp Deviation ∆I

REF

Min IK for Regulation I Off State Leakage I

REF

∆ V

REF

K(MIN)

K(OFF)

Dynamic Output Z Impedance IK = 0.16 to 100mA

2 2.490 2.503 2.515 2.470 2.495 2.520 V

REF

2TJ = 0°C to 150°C 2.469 2.536 2.449 2.541 V

REF

K

V

REF

3 10V to 20V -2.0 -0.4 0.3 -2.0 -0.4 0.3 3 0.7 4.0 0.7 4.0 µA 3TJ = 0°C to 105°C 0.4 1.2 0.4 1.2 µA

REF

2 160 160 µA 4V

REF

VKA = 20V

2ƒz ≤ 1kHz 0.15 0.5 0.15 0.5 Ω

KA

Operating Range (TJ ) = -40°C to 125°C. * See appropiate test circuit (Figure 2)

, unless otherwise specified.

REF

SPX2431LA SPX2431

to 10V -2.7 -1.01 -2.7 -1.01 mV/V

= 0V, 0.04 500 0.04 500 nA

2

CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)

mV

%

ppm

000

∆

V

REF

∆

T

-10

0.55000

0153045607590105

Junction Temperature (°C)

0.07 mV/°C

0.003 %/°C 27 ppm/°C

•

TC in mV/°C =

•

TC in %/°C =

• TC in ppm/°C =

∆

V

(mV)

REF

∆

T

A

∆

V

REF

(

∆

V

at 25°C

REF

∆

V

REF

(

∆

V

at 25°C

REF

x 100

)

∆

T

A

6

x 10

)

∆

T

A

Figure 1. V

VS Temperature.

REF

TEST CIRCUITS

V

IN

I

REF

Figure 2. Test Circuit for VKA = V

V

=

KA

I

K

KOFF

I

K (OFF)

V

KA

V

REF

V

IN

R1

I

REF

(V

)

REF

R2

Figure 3. Test Circuit for VKA > V

V

KA

I

K

REF

V

IN

Figure 4. Test Circuit for I

3

TYPICAL PERFORMANCE CHARACTERISTICS

150 125 100

VKA = V

REF

0°C to 105°C

75 50 25

0

-25

Cathode Current (mA)

K

-50

I

-75

-100

-2 -1 0 1 2 3

V

Cathode Voltage (V)

KA

Figure 5. High Current Operating Characteristics

270 240 210

VKA = V

REF

0° to 105°C

180 150 120

90 60 30

Cathode Current (µA)

K

I

0

105°C

25°C

-0°C

-30

-60

-1.0 0 1.0 2.0 3.0

V

Cathode Voltage (V)

KA

Figure 7. Low Current Operating Characteristics

2.53

VKA = V

2.52

REF

IK = 10mA

2.51

2.50

2.49

2.48

Reference Voltage (V)

2.47

REF

V

2.46

2.45

-60 -30 0 30 60 90 120

Ambient Temperature (°C)

T

A

Figure 6. Reference Voltage VS Ambient Tempetature

3.0

R1 = 10kΩ

R2 = ∞ = 10mA

I

K

0

-60 -30 0 30 60 90 120

Ambient Temperature (°C)

T

A

Reference Input Current (µA)

REF

I

2.5

2.0

1.5

1.0

0.5

Figure 8. Reference Input Current VS Ambient Temperature

0

-10 0°C

(mV)

REF

∆V

-20

-30

IKA = 10mA

25°C

75°C

125°C

-40

-50

0 3691215 18 21 24 27 30

V

Cathode Voltage (V)

KA

Figure 9. Reference Voltage Line Regulation VS Cathode Voltage and T

AMBIENT

70

60

50

40

30

Noise Voltage nV/Hz

20

VKA = V

REF

IK = 10mA

10

TA = 25°C

0 10 100 1K 10K 100K

f Frequency (Hz)

Figure 10. Noise Voltage VS Frequency

4

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

0.150

VKA = V

REF

0.125

IK = 160µ to 100mA

f≤1kHz

0.100

0.075

0.050

Dynamic Impedance (Ω)

KA

Z

0.025

0.0

-60 -30 0 30 60 90 120

Free Air Temperature

T

A

Figure 11. Low Frequency Dynamic Output Impedance VS T

AMBIENT

V

OUT

9µF

V

IN

15kΩ

8.25kΩ

I

K

230Ω

GND

REF LEVEL

60.000dB

0.0deg

60dB

50dB

40dB

30dB

20dB

10dB

0dB

-10dB

-20dB

-30dB

-40dB 10 100 1K 10K 100K 1M 10M

START 10.000Hz

/DIV

10.000dB

45.000deg

MARKER 3 039 MAG (A/R) MARKER 3 039 PHASE (A/R)

PHASE

GAIN

STOP 50 000 000.000Hz

642.400Hz

0.057dB

6642.400Hz

81.770deg

215°

180°

135°

90°

45°

0°

-45°

-90°

-135°

-180°

-215°

Figure 12. Small Signal Gain and Phase VS Frequency; I

= 10mA, TA = 25°C

K

V

IN

V

OUT

Figure 13. Test Circuit for Gain and Phase Frequency

Figure 14. Frequency = 100kHz, IK = 10mA, TA = 25°C

Response

V

IN

250Ω

V

OUT

I

K

f

p = 100kHz

50Ω

GND

Figure 15. Test Circuit for Pulse Response

100

A: VKA = V

90 80 70

REF

B: VKA= 5V at IK=10mA C: V

=10V at IK=10mA

KA

D: VKA=15V at IK=10mA

C

60 50 40 30

Cathode Current (mA)

K

20

I

10

0

10010110210310410510610

STABLE

T

A = 25°C

C

Load Capacitance (pF)

L

A

B

D

Figure 16. Stability Boundary Conditions

STABLE

7

5

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

100

150 Ω

I

K

R

C

L

10kΩ

TA=25°C I

=

160µ to 100mA

K

10

1.0

Dynamic

-

KA

Z

0.1

0.01 1K 10K 100K 1M 10M

f - Frequency (Hz)

Figure 17. Test Circuit for Stability

Figure 18. Dynamic Output Impedance TA = 25°C, IK = 160µA to 100mA

100

10

VKA = 20V V

= 0V

1

REF

Cathode Current (nA)

0.1

KOFF

I

0.01

-50 0 50 100 150

TA Ambient Temperature (°C)

V

IN

R3

R1

0.1%

V

REF

R2

0.1%

Figure 19. Off State Leakage Figure 20. Shunt Regulator V

V

IN

I

SINK

R2

Q1

OUT

R3

Opto Isolator

= (1+R1/R2)V

OUT

V

OUT

SPX2431L

REF

R1

0.1%

R3 sets feedback gain, C1 provides feedback compensation

R2

0.1%

SPX2431L

Figure 21. Constant Current Sink, I

SINK

R1

0.1%

= V

REF

/R1

Isolated

Feedback

SPX2431L

V

OUT

C1

RTN

+

C2

Figure 22. Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters

6

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

V

IN

R5

R4

R3

R1

C1

SPX2431L

0.1%

R2

0.1%

Figure 23. Precision High Current Series Regulator V

= (1+R1/R2)V

OUT

V

IN

R1

REF

V

CC

R2

V

OUT

V

IN

R1

0.1%

R2

0.1%

V

OUT

SPX2431L

R3

Q1

V

OUT

Figure 24. High Current Shunt Regulator V

= (1+R1/R2)V

OUT

REF

* Resistor values are chosen such that the effect to I

is negligible

REF

.

SPX2431L

Figure 25. Single Supply Comparator with Temperature Compensated Threshold. VIN threshold = 2.5V

7

PACKAGES

8-Pin Surface Mount (S)

CATHODE

ANODE

N/C

1

2

3

4

Top View

SOT-23-3 (M)

REF

8

ANODE

7

ANODE

6

N/C

5

ANODE

1

3

2

CATHODEREF

Top View

PACKAGE:

8 PIN PLASTIC

REF

TO- 92 ( N)

132

ANODE

Bottom View

CATHODE

SMALL OUTLINE (SOIC) (NARROW)

4.0 (0.158)

3.8 (0.150)

5.2 (0.205)

4.6 (0.181)

6.2 (0.244)

5.8 (0.228)

Pin 1

1.27 (0.50) BSC

1.75 (0.069)

1.35 (0.053)

0.78 (0.031)

5.0 (0.197)

4.8 (0.188)

0.56 (0.022)

0.49 (0.019)

0.45 (0.018)

0.35 (0.014)

0.61 (0.024)

0.20 (0.008)

0.10 (0.004)

0.37 (0.015) BSC

0.22 (0.009)

0.19 (0.007)

45

°

7°(4 PLCS)

0.77 (0.030)

0.64 (0.025)

3°-6°

7°(4 PLCS)

8

ANODE

3

PACKAGE:

SOT23-3 (M)

0.015 - 0.018

(0.381 - 0.457)

0.020 - 0.024

(0.508 - 0.610)

1

Top View

2

CATHODEREF

0.047 - 0.055

(1.194 - 1.397)

0.035 - 0.040

(0.889 - 1.016)

0.070 - 0.080

(1.778 - 2.032)

0.083 - 0.098

(2.108 - 2.489)

0.110 - 0.120

(2.794 - 3.048)

0.001 - 0.004

(0.025 - 0.102)

0.030 - 0.041

(0.762 - 1.041)

0.003 - 0.005

(0.076 - 0.127)

0.018 - 0.024

(0.457 - 0.610)

9

0.090 (2.286) Radius typ. 2

1

3

PACKAGE: TO-92

0.145 (3.683)

0.135 (3.429)

0.055 (1.397)

0.045 (1.143)

10° typ.

0.185 (4.699)

0.175 (4.445)

Seating Plane

0.016 (0.406)

0.014 (0.356)

0.055 (1.397)

0.045 (1.143)

BOTTOM VIEW

0.185 (4.699)

0.045 (1.143)

0.085 (2.159) Diameter

0.090 (2.286) typ.

0.025 (0.635) Max Uncontrolled Lead Diameter

0.500 (12.70) Min.

5° typ.

0.0155 (0.3937)

0.0145 (0.3683)

0.105 (2.667)

0.095 (2.413)

10

ORDERING INFORMATION

PART NUMBER ACC OUTPUT VOLTAGE PACKAGES

SPX2431LAM...................... 0.5%..............2.503V ................................ 3-Pin SOT-23

SPX2431LAS ...................... 0.5%..............2.503V ....................................8-Pin SOIC

SPX2431LAN ...................... 0.5%..............2.503V .................................. 3-Pin TO-92

SPX2431LM ........................ 1.0%..............2.495V ................................ 3-Pin SOT-23

SPX2431LS......................... 1.0%..............2.495V ....................................8-Pin SOIC

SPX2431LN......................... 1.0%..............2.495V .................................. 3-Pin TO-92

Corporation

SIGNAL PROCESSING EXCELLENCE

Sipex Corporation Headquarters and

Sales Office

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

Sales Office

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

11

Datasheet SPX2431L Datasheet (Sipex)

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