SPX431A,B,C Precision Adjustable Shunt Regulator · 4 Rev F: Nov 2 -06 SPX43 A,B,C Precision Adjustable Shunt Regulator © 2006 Sipex Corporation

Rev F: Nov 2-06 SPX43A,B,C Precision Adjustable Shunt Regulator © 2006 Sipex Corporation

Precision Adjustable Shunt Regulator

The SPX43 is a three-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431 has thermal stability, wide operating current of 150mA and broad temperature range of 0°C to 150°C, making it suitable for a variety of applications which require a low-cost, high performance solution. SPX431A tolerance of 0.5% is proven to be sufficient to overcome all other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly line and contribute a significant cost savings. The output voltage may be adjusted to any value between VREF and 36 volts with two external resistors. The SPX431 is available in SOIC-8, SOT-23-3, SOT-23-5, SOT89, and TO-92 packages.

SPX431A,B,C

FEATURES• Trimmed Bandgap: 0.5%, 1% and 2%• Wide Operating Current: 1mA to 150mA• Extended Temperature Range: 0°C to 105°C• Low Temperature Coefficient: 30 ppm/°C• Improved Replacement in Performance for TL43• Low Cost Solution• Available in Lead Free, RoHS compliant packaging: SOIC, SOT-89, SOT-23-3, SOT-23-5, and TO-92

APPLICATIONS• Battery Operated Equipment• Adjustable Supplies• Switching Power Supplies• Error Amplifiers• Single Supply Amplifier • Monitors/VCRs/TVs• Personal Computers

DESCRIPTION

Anode (A)

Cathode (K)

2.5V

Reference(R) +

-

TyPICAL APPLICATIONS CIRCUIT

2Rev F: Nov 2-06 SPX43A,B,C Precision Adjustable Shunt Regulator © 2006 Sipex Corporation

TyPICAL ThERmAL RESISTANCESPACKAGE ØJA ØJC TyPICAL DERATING

SOT-89 107.1°C/W 8°C/W 9.1 mW/°C

SOIC-8 124.8°C/W 45°C/W 5.7 mW/°C

SOT-23-5 191°C/W 150°C/W 1.7 mW/°C

TO-92 131.9°C/W 80°C/W 6.3 mW/°C

SOT-23-3 300°C/W 136°C/W 3.3 mW/°C

ABSOLUTE mAXImUm RATINGSCathode-Anode Reverse Breakdown Vka ......................................37VAnode-Cathode Forward Current, (<10ms) Iak ................................AOperating Cathode Current Ika ..................................................150mAReference Input Current Iref ......................................................0mAContinuous Power Dissipation at 25°C Pd SOIC-8 .....................................................................750mW SOT-23-5 ................................................................200 mW SOT-23-3 ................................................................47 mW SOT-89 ..................................................................000mW\ TO-92 .......................................................................775mWJunction Temperature Tj ...........................................................150 °CStorage Temperature Tstg ...............................................-65 to 150 °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 speci-fication is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

RECOmmENDED CONDITIONS

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

Cathode Voltage VKA VREF to 36 V Cathode Current IK 0 mA

PARAmETER SymBOL RATING UNIT

ELECTRICAL ChARACTERISTICSElectrical characteristics at 25°C Ik = 10mA Vk = Vref, unless otherwise specified.

Parameter Symbol Test Conditions

Test Circuit SPX431A SPX431B SPX431C Unit

min Typ max min Typ max min Typ max

Reference Voltage VREF TJ = 0°C to 105°C

2.490 2.469 2.503 2.515

2.5362.4702.449 2.495 2.520

2.541 2.445 2.495 2.545 V V

∆VREF with Temp. TC 0.07 0.20 0.07 0.20 0.07 0.20 mV/°C

Ratio of Change in VREF to Cath-ode Voltage

∆Vref

∆Vk

VREF to 10V10V to 36V 2

-2.7-2

-.0-0.4

0.3

-2.7-2.0

-.0-0.4 0.3

-2.7-2

-.0-0.4 0.3

mV/V

Reference Input Current IREF 2 0.7 4 0.7 4 0.7 4 µA

IREF Temp Deviation ∆IREF

TJ = 0°C to 105°C 2 0.4 .2 0.4 .2 0.4 .2 µA

Min IK for Regulation IK(MIN) 0.4 0.4 0.4 mA

Off State Leak-age IK(OFF)

VREF = 0V,VKA = 36V 3 0.04 250 0.04 500 0.04 000 nA

Dynamic Output Impedance ZKA

fZ = 1kHzIK = 1 to 150mA 0.15 0.5 0.15 0.5 0.15 0.5 Ω


D

DVREF

0 15 30 45 60 75 90 105

-10

0.55000

00 0

0.07 mV/°C

0.003 %/°C

27 ppm/°C

TC in mV/°C =

TC in %/°C =

DVREF (mV)

DTA

DTA

DVREF at 25°C

DVREF x 100( )

TC in ppm/°C =DTA

DVREF at 25°CDVREF x 106( )

ppm/°C %/°C mV/°C

Junction Temperature (°C)

CALCULATING AvERAGE TEmPERATURE COEFFICIENT (TC)

Figure 1. Vref VS Temperature.

SOT-23-5 (M5)

321

Top View

SPX4315 4

Top View

SPX431

SOT-89 (M1)

1 2 3

Bottom View

TO-92 (N)

1 32

N/C REF ANODE CATHODE CATHODEANODE

REF

Top View

2

1

3

4

8

7

6

5

SPX431

8-Pin Surface Mount (S)

CATHODE REF

ANODE

ANODE

ANODE

ANODE

N/C N/C N/C CATHODE

ANODEREF

Top View

SPX431

SOT-23-3 (M)

1 2

3

REF

ANODE

CATHODE

PACKAGE PINOUTS

TEST CIRCUITS

IREF

VKA = VREFVIN

IK IREF

VKAVIN

IK

(VREF)

R1

R2

VKAVIN

IK (OFF)

Test Circuit . Test Circuit for Vka = Vref

Test Circuit 2. Test Circuit for Vka > Vref

Test Circuit 3.Test Circuit for Ikoff


-2 -1 0 1 2 3

-100

-75

-50

-25

0

25

50

75

100

125

150

IK-

Cat

ho

de

Cu

rren

t (m

A)

VKA - Cathode Voltage (V)

VKA = VREF

Temperature Range: 0°C to 105°C

-60 -30 0 30 60 90 120

2.53

2.52

2.51

2.50

2.49

2.48

2.47

2.46

2.45

TA Ambient Temperature (°C)

VR

EF

Ref

eren

ce V

olta

ge (

V)

VKA = VREFIK = 10mA

TyPICAL PERFORmANCE ChARACTERISTICS

High Current Operating Characteristics Reference Voltage vs. Ambient Temperature

-1.0 0 1.0 2.0 3.0

900

800

700

600

500

400

300

200

100

0

-100

-200

VKA Cathode Voltage (V)

IKC

atho

de C

urre

nt (

µA

)

VKA = VREF0° to 105°C

105°C

25°C

-0°C

-60 -30 0 30 60 90 120

3.0

2.5

2.0

1.5

1.0

0.5

0


IRE

FR

efe

rence

Input C

urr

ent (µ

A) R1 = 10kΩ

R2 = ∞ IK = 10mA

0 3 6 9 12 15 18 21 24 27 30

0

-10

-20

-30

-40

-50

VKA Cathode Voltage (V)

∆V

RE

F(m

V)

0°C

25°C

75°C

125°CIKA = 10mA

Reference Voltage Line Regulation vs, Cathode Volt-age and Tambient

Low Current Operating Characteristics Reference Input Current vs. Ambient Temperature

70

60

50

40

30

20

10

0

f Frequency (Hz)

No

ise

Vo

ltag

e n

V/÷

Hz

VKA = VREFIK = 10mATA = 25°C

Noise Voltage vs. Frequency


TyPICAL PERFORmANCE ChARACTERISTICS (continued)

-60 -30 0 30 60 90 120

0.150

0.125

0.100

0.075

0.050

0.025

0.0

TA Free Air Temperature

VKA = VREFIK = 1 to 100mA

f≤1kHz

Low Frequency Dynamic Output Impedance vs. Tambient

10 100 1K 10K 100K 1M 10M

START 10.000Hz STOP 50 000 000.000Hz

REF LEVEL60.000dB0.0deg

/DIV10.000dB45.000deg

MARKER 19 422MAG (A/R)MARKER 19 422PHASE (A/R)

611.000Hz-0.125dB611.000Hz46.717deg

PHASE

GAIN

60dB

50dB

40dB

30dB

20dB

10dB

0dB

-10dB

-20dB

-30dB

-40dB

215°

180°

135°

90°

45°

0°

-45°

-90°

-135°

-180°

-215°

Small Signal Gain and Phase vs. Frequency; Ik = 0mA, Ta = 25°C

IK

VIN

9µF15kΩ

8.25kΩ

VOUT

GND

230Ω

Test Circuit for Gain and Phase Frequency Re-sponse

Fz = 100kHz, Ik = 0mA, Ta = 25°C

VOUT

VIN

Test Circuit for Pulse Response Stability Boundry Conditions

IK

VOUT

GND

250Ω

50Ω

VIN

fp = 100kHz

100 101 102 103 104 105 106 107

100

90

80

70

60

50

40

30

20

10

0

CL Load Capacitance (pF)

IKC

atho

de C

urre

nt (

mA

)

A: VKA = VREF

B: VKA= 5V at IK=10mAC: VKA=10V at IK=10mAD: VKA=15V at IK=10mA

C

D

B

ASTABLE STABLE

TA = 25°C



Test Circuit for Stability Dynamic Output Impedance Ta = 25°C, Ik = to 00mA

Off-State Leakage Shunt Regulator Vout = (1+R1/R2)Vref

150 W

10kΩ

IK

CL

R

0.01

0.1

1

10

100

-50 0 50 100 150


IKO

FF

Cat

hode

Cur

rent

(nA

)

VKA = 36VVREF = 0V

TA = 25 °CIK =1 to 100mA

ZK

A-

Dyn

am

ic Im

pedance

(Ω

)

f Frequency (Hz)

100

10

1.0

0.1

0.011K 10K 100K 1M 10M

R20.1%

VIN R3

R10.1%

VOUT

VREFSPX431A,B,C

Constant Current, Sink, Isink = Vref/R1 Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters

Q1

VIN

R2

R10.1%

ISINK

SPX431A,B,C

R20.1%

R3R10.1%

VOUT

SPX431A,B,C

C2

C1

IsolatedFeedback

VOUTRTN

+

R3 sets feedback gain,C1 provides feedbackcompensation

Opto Isolator



Figure 23. Precision High Current Series Regulator Vout = (1+R1/R2)Vref

Figure 24. High Current Shunt Regulator Vout = (1+R1/R2)Vref

Figure 25. Single Supply Comparator with Tempera-ture Compensated Threshold. Vin Threshold = 2.5V

VIN

R10.1%

SPX431A,B,C

R3

R20.1%

C1

R5

R4

VOUT

VIN

R10.1%

SPX431A,B,C

R3

R20.1%

Q1

VOUT

VCC

R2

SPX431A,B,C

VINVOUT

R1

* Resistor values are chosen such that the ef-fect to Iref is negligible.


PACKAGE: 8 PIN NSOIC


PACKAGE: 5 PIN SOT-23



Rev F: Nov 2-06 SPX43A,B,C Precision Adjustable Shunt Regulator © 2006 Sipex Corporation

PACKAGE: 3 PIN TO-92




Sipex Corporation

headquarters and Sales Office233 South Hillview DriveMilpitas, CA 95035TEL: (408) 934-7500FAX: (408) 935-7600

ORDERING INFORmATIONPART NUmBER ACCURACy OUTPUT vOLTAGE PACKAGESPX431AM5 .........................0.5% ..................... 2.503V ..........................5-Pin SOT-23SPX431AM5/TR ....................0.5% ..................... 2.503V ..........................5-Pin SOT-23SPX43AM .........................0.5% ..................... 2.503V ..........................3-Pin SOT-89SPX431AM1/TR ....................0.5% ..................... 2.503V ..........................3-Pin SOT-89 SPX43AS ............................0.5% ..................... 2.503V ............................. 8-Pin SOICSPX431AS/TR ......................0.5% ..................... 2.503V ............................. 8-Pin SOICSPX43AN ............................0.5% ..................... 2.503V ............................3-Pin TO-92SPX43AM ...........................0.5% ..................... 2.503V ..........................3-Pin SOT-23SPX431AM/TR ......................0.5% ..................... 2.503V ..........................3-Pin SOT-23

SPX431BM5 .........................1.0% ..................... 2.495V ..........................5-Pin SOT-23SPX431BM5/TR ....................1.0% ..................... 2.495V ..........................5-Pin SOT-23SPX43BM .........................1.0% ..................... 2.495V ..........................3-Pin SOT-89SPX431BM1/TR ....................1.0% ..................... 2.495V ..........................3-Pin SOT-89SPX43BS ............................1.0% ..................... 2.495V ............................. 8-Pin SOICSPX431BS/TR ......................1.0% ..................... 2.495V ............................. 8-Pin SOICSPX43BN ............................1.0% ..................... 2.495V ............................3-Pin TO-92SPX43BM ...........................1.0% ..................... 2.495V ..........................3-Pin SOT-23SPX431BM/TR ......................1.0% ..................... 2.495V ..........................3-Pin SOT-23

SPX431CM5 .........................2.0% ..................... 2.495V ..........................5-Pin SOT-23SPX431CM5/TR ...................2.0% ..................... 2.495V ..........................5-Pin SOT-23SPX43CM .........................2.0% ..................... 2.495V ..........................3-Pin SOT-89SPX431CM1/TR ...................2.0% ..................... 2.495V ..........................3-Pin SOT-89SPX43CS ............................2.0% ..................... 2.495V ............................. 8-Pin SOICSPX431CS/TR ......................2.0% ..................... 2.495V ............................. 8-Pin SOICSPX43CN ............................2.0% ..................... 2.495V ............................3-Pin TO-92SPX43CM ...........................2.0% ..................... 2.495V ..........................3-Pin SOT-23SPX431CM/TR .....................2.0% ..................... 2.495V ..........................3-Pin SOT-23

/TR = Tape and ReelTR pack quantity is 3000 for SOT-23-3, 2500 for SOT-23-5, SOT-89 and NSOIC, and 2000 for TO-92 in ammo pack.

Available in lead free packaging. To order add “-L” suffix to part number. Example: SPX431AM5/TR = standard; SPX431AM5-L/TR = lead free

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.

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SPX431A,B,C Precision Adjustable Shunt Regulator · 4 Rev F: Nov 2 -06 SPX43 A,B,C Precision Adjustable Shunt Regulator © 2006 Sipex Corporation