AS431AZ-G1 - BCD Semiconductor Manufacturing Limited

Data Sheet

1

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

General Description

The AS431 is a three-terminal adjustable shunt regula-

tor with guaranteed thermal stability over a full opera-

tion range. It features sharp turn-on characteristics, low

temperature coefficient and low output impedance,

which make it ideal substitute for Zener diode in appli-

cations such as switching power supply, charger and

other adjustable regulators.

The output voltage of AS431 can be set to any value

between VREF (2.5V) and the corresponding maximum

cathode voltage (36V).

The AS431 precision reference is offered in two volt-

age tolerance: 0.5% and 1.0%.

This IC is available in 4 packages: TO-92 (bulk or

ammo packing), SOT-23, SOT-23-5 and SOT-89.

Features

·Programmable Precise Output Voltage from 2.5V

to 36V

·High Stability under Capacitive Load

·Low Temperature Deviation: 4.5mV Typical

·Low Equivalent Full-range Temperature Coeffi-

cient with 20PPM/oC Typical

·Sink Current Capacity from 1mA to 100mA

·Low Output Noise

·Wide Operating Range of -40 to 125oC

Applications

·Charger

·Voltage Adapter

·Switching Power Supply

·Graphic Card

·Precision Voltage Reference

Figure 1. Package Types of AS431

SOT-23

SOT-89

SOT-23-5

TO-92(Bulk Packing) TO-92(Ammo Packing)

Data Sheet

2

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Figure 2. Pin Configuration of AS431 (Top View)

Figure 3. Functional Block Diagram of AS431

Functional Block Diagram

REF

VREF

CATHODE

ANODE

+

-

Pin Configuration

Z Package

(SOT-23)

N Package R Package

(SOT-89)

ANODE

REF REF ANODE

K Package

(SOT-23-5)

NC ANODE

REF

CATHODE

ANODE

REF

1

2

3

CATHODE

Z Package

CATHODE

ANODE

REF

1

2

3

(TO-92(Bulk Packing)) (TO-92(Ammo Packing))

3

21

123

1

2

34

5

Note 1: Pin 2 is attached to substrate and

must be connected to ANODE or open

*

(Note 1)

CATHODE

Data Sheet

3

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Ordering Information

Circuit Type

Voltage Tolerance

B: 1.0%

A: 0.5%

E1: Lead Free

AS431 　 -

Package

TR: Tape and Reel or Ammo

Blank: Bulk

N: SOT-23 K: SOT-23-5

R: SOT-89 Z: TO-92

Package Temperature

Range

Voltage

Tolerance

Part Number Marking ID Packing

Type

Lead Free Green Lead Free Green

SOT-23 -40 to 125oC

0.5% AS431ANTR-E1 AS431ANTR-G1 EB5 GB5 Tape & Reel

1.0% AS431BNTR-E1 AS431BNTR-G1 EB6 GB6 Tape & Reel

SOT-23-5 -40 to 125oC

0.5% AS431AKTR-E1 AS431AKTR-G1 E6H G6H Tape & Reel

1.0% AS431BKTR-E1 AS431BKTR-G1 E6I G6I Tape & Reel

TO-92 -40 to 125oC

0.5% AS431AZ-E1 AS431AZ-G1 AS431AZ-E1 AS431AZ-G1 Bulk

0.5% AS431AZTR-E1 AS431AZTR-G1 AS431AZ-E1 AS431AZ-G1 Ammo

1.0% AS431BZ-E1 AS431BZ-G1 AS431BZ-E1 AS431BZ-G1 Bulk

1.0% AS431BZTR-E1 AS431BZTR-G1 AS431BZ-E1 AS431BZ-G1 Ammo

SOT-89 -40 to 125oC

0.5% AS431ARTR-E1 AS431ARTR-G1 E43G G43G Tape & Reel

1.0% AS431BRTR-E1 AS431BRTR-G1 E43H G43H Tape & Reel

G1: Green

BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with

"G1" suffix are available in green packages.

Data Sheet

4

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Parameter Symbol Value Unit

Cathode Voltage VKA 40 V

Cathode Current Range (Continuous) IKA -100 to 150 mA

Reference Input Current Range IREF 10 mA

Power Dissipation PD

Z, R Package: 770

mW

N, K Package: 370

Junction Temperature TJ150 oC

Storage Temperature Range TSTG -65 to 150 oC

ESD (Human Body Model) ESD 2000 V

Parameter Symbol Min Max Unit

Cathode Voltage VKA VREF 36 V

Cathode Current IKA 1.0 100 mA

Operating Ambient

Temperature Range TA-40 125 oC

Recommended Operating Conditions

Note 2: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the

device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond

those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum

Ratings" for extended periods may affect device reliability.

Absolute Maximum Ratings (Note 2)

Data Sheet

5

Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Parameter Test

Circuit Symbol Conditions Min Typ Max Unit

Reference Voltage 0.5% 4VREF VKA=VREF, IKA=10mA 2.487 2.500 2.512 V

1.0% 2.475 2.500 2.525

Deviation of Reference Voltage

Over Full Temperature Range 4ΔVREF

VKA=VREF

IKA= 10mA

0 to 70oC4.5 8

mV

-40 to 85oC4.5 10

-40 to 125oC4.5 16

Ratio of Change in Reference

Voltage to the Change in

Cathode Voltage

5ΔVREF

ΔVKA

IKA=10mA

ΔVKA=

10V to VREF

-1.0 -2.7

mV/V

ΔVKA=

36V to 10V -0.5 -2.0

Reference Current 5 IREF IKA=10mA,R1=10KΩ, R2=∞0.7 4 μA

Deviation of Reference Current

Over Full Temperature Range 5ΔIREF

IKA=10mA, R1=10KΩ

R2=∞, TA=-40 to 125oC0.4 1.2 μA

Minimum Cathode Current for

Regulation 4IKA

(Min) VKA=VREF 0.4 1.0 mA

Off-state Cathode Current 6 IKA

(Off) VKA=36V, VREF=0 0.05 1.0 μA

Dynamic Impedance 4 ZKA

VKA=VREF, IKA=1 to 100mA,

f ≤ 1.0KHz 0.15 0.5 Ω

Thermal Resistance θJC

SOT-23 135.9

oC/W

SOT-23-5 135.9

TO-92 81.9

SOT-89 29.8

Electrical Characteristics

Operating Conditions: TA=25oC, unless otherwise specified.

Data Sheet

6

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Figure 4. Test Circuit 4 for VKA=VREF

Figure 5. Test Circuit 5 for VKA>VREF

Figure 6. Test Circuit 6 for IOFF

IOFF

VIN VKA

Electrical Characteristics (Continued)

VIN VKA

R1

IKA

VREF

VIN VKA

IKA

R1

R2 VREF

VKA=VREF(1+R1/R2)+ IREF*R1

IREF

R3

Data Sheet

7

Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Figure 7. Reference Voltage vs. Ambient Temperature Figure 8. Reference Current vs. Ambient Temperature

Figure 9. Cathode Current vs. Cathode Voltage Figure 10. Cathode Current vs. Cathode Voltage

-60 -40 -20 0 20 40 60 80 100 120 140

2.485

2.490

2.495

2.500

2.505

2.510

Reference Voltage (V)

Ambient Temperature (oC)

VKA = VREF

IKA = 10mA

-60 -40 -20 0 20 40 60 80 100 120 140

0.0

0.5

1.0

1.5

R1=10K,R2=Infinite

IKA=10mA

Reference Current (μA)

Ambient Temperature (0C)

-2-10123

-100

-50

0

50

100

150

Cathode Current (mA)

Cathode Voltage (V)

VKA=VREF

TA=250C

-1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5

-200

0

200

400

600

800

Cathode Current (μA)

Cathode Voltage (V)

VKA=VREF

TA=250C

Typical Performance Characteristics

Data Sheet

8

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Typical Performance Characteristics (Continued)

Figure 11. Off-State Cathode Current vs. Figure 12. Ratio of Delta Reference Voltage to the

Ambient Temperature Ratio of Delta Cathode Voltage

-40-20 0 20406080100120

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

Off-State Cathode Current (μA)

Ambient Temperature (oC)

VKA=36V

VREF=0

-40 -20 0 20 40 60 80 100 120

-1.4

-1.3

-1.2

-1.1

-1.0

-0.9 VKA=3.5V to 36V

ΔVREF / ΔVKA (mV/V)

Ambient Temperature (oC)

Figure 13. Small Signal Voltage Gain vs. Frequency

10μF

8.2K

15K I KA

Output

242

GND

1k 10k 100k 1M

-10

0

10

20

30

40

50

60

70

Voltage Gain (dB)

Small Signal Frequency (Hz)

TA=250C

IKA=10mA

Data Sheet

9

Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Typical Performance Characteristics (Continued)

Figure 14. Reference Impedance vs. Frequency

1K 10K 100K 1,000K

0.1

1

10

Reference Impedance (Ω)

Frequency (Hz)

IKA=10mA

TA=25oC

GND

Output

50

1K

IKA

Figure 15. Stability Boundary Conditions vs. Load Capacitance

IKA

R1 (10K)

R2

150

0

10

20

30

40

50

60

70

80

90

100

10

1

0.1

0.010.001

Stable

Cathode Current (mA)

Load Capacitance (μF)

TA=25oC

VKA=VREF

VKA= 5V:No oscillation

VKA=10V:No oscillation

VKA=15V:No oscillation

Data Sheet

10

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Typical Performance Characteristics (Continued)

Figure 16. Pulse Response of Input and Output Voltage

Pulse

Generator

f=100KHz

220

50

Output

GND

0246

0

1

2

3

4

5

Input

Input and Output Voltage (V)

Time (μS)

Output

Data Sheet

11

Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

VIN VOUT

R1

R2

VREF

AS431

R3

VIN VOUT

R4

R1

R2

VREF

R3

AS431

IOUT

VIN

AS431

R2

R1

Figure 17. Shunt Regulator

Figure 18. High Current Shunt Regulator

VOUT=(1+R1/R2)*VREF

VOUT=(1+R2/R3)*VREF

IOUT=VREF/R2 + IKA

Figure 19. Current Source or Current Limit

Typical Application

Data Sheet

12

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Figure 21. PWM Converter with Reference

Figure 20. Precision 5V 1A Regulator

AZ1117

VIN VOUT

Adjust

8.2K

AS431

R1

R2

R3

250

5V, 1A

PWM Controller

C1

R1

R2 680

U2

3

4

PS521

C2

2

R3 R4

R5

VOUT

AS431

Q1

COMP

VFB

Typical Application (Continued)

Data Sheet

13

Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Mechanical Dimensions

TO-92(Bulk Packing) Unit: mm(inch)

2.420(0.095)

2.660(0.105)

0.360(0.014)

0.760(0. 030)

Φ

1.600(0.063)

MAX

12.500(0.492)

15.500(0.610)

1.270(0.050)

TYP

3.300(0.130)

3.700(0.146)

4.300(0.169)

4.700(0.185)

1.000(0.039)

1.400(0.055)

4.400(0.173)

4.800(0.189)

3.430(0.135)

MIN

0.320(0. 013)

0.510(0. 020)

0.000(0.000)

0.380(0.015)

Data Sheet

14

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Mechanical Dimensions (Continued)

TO-92(Ammo Packing) Unit: mm(inch)

Φ

4.300(0.169)

4.700(0.185)

12.500(0.492)

14.500(0.571)

2.540(0.100)

Typ

1.270(0.050)

Typ

0. (0.015)

0.550(0.022 )

4.400(0.173

)

4.800(0.189

)

3. 430(0. 135)

MIN

0. 320(0. 013)

0. 510(0.020)

0.000(0.000)

0. 380(0. 015)

MAX

1. 100(0. 043

1. 400(0. 055

)

3.300(0.130)

3.800(0.150)

Φ

1.600(0.063)

)

380

2.500(0.098

)

4.000(0.157

)

13. 000(0. 512

)

15.000(0.591

)

Data Sheet

15

Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Mechanical Dimensions (Continued)

SOT-23 Unit: mm(inch)

2.300(0.091)

2.500(0.098)

1.200(0.047)

1.400(0.055)

0.920(0.036)

0.980(0.039)

0.300(0.012)

0.500(0.020)

1.900(0.075)REF

2.800(0.110)

3.000(0.118)

2.0°

3.0 °

0.500(0.020)

0.700(0.028)

1.050(0.041)REF 0.020(0.001)

0.100(0.004)

0.900(0.035)

1.100(0.043)

4×R0.100(0.004)

7.0°

0.550(0.022)REF

0.200(0.008)MIN

0.100(0.004) GAUGE PLANE

0.080(0.003)

0.150(0.006)

R0.100(0.004)

0.0°~10.0°

Data Sheet

16

BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Dec. 2012 Rev. 2. 6

Mechanical Dimensions (Continued)

SOT-23-5 Unit: mm(inch)

2.820(0.111)

2.650(0.104)

1.500(0.059)

0.000(0.000)

0.300(0.012)

0.950(0.037)

0.900(0.035)

0.100(0.004)

0.200(0.008)

0.300(0.012)

8°

0°

3.020(0.119)

1.700(0.067)

2.950(0.116)

0.400(0.016)

0.150(0.006)

1.300(0.051)

0.200(0.008)

0.600(0.024)

1.800(0.071)

2.000(0.079)

0.700(0.028)

REF

TYP

1.450(0.057)

MAX

Data Sheet

17

Dec. 2012 Rev. 2. 6 BCD Semiconductor Manufacturing Limited

ADJUSTABLE PRECISION SHUNT REGULATORS AS431

Mechanical Dimensions (Continued)

SOT-89 Unit: mm(inch)

45

1.030(0.041)REF

1.550(0.061)REF

4.400(0.173)

4.600(0.181)

0.900(0.035)

1.100(0.043)

3.950(0.156)

4.250(0.167)

3.000(0.118)

TYP

0.480(0.019)

2.300(0.091)

2.600(0.102)

0.320(0.013)

0.520(0.020)

310

2.060(0.081)REF

1.400(0.055)

1.600(0.063)

0.350(0.014)

0.450(0.018)

R0.150(0.006)

3

10

1.500(0.059)

0.320(0.013)REF

1.620(0.064)REF

2.210(0.087)REF

0.320(0.013)

0.520(0.020)

1.800(0.071)

IMPORTANT NOTICE

BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-

cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility fo r use of any its products for any

particular purpose, nor does BCD Semiconductor Man ufacturing Limited assume any liability arising out of the application or use

of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or

other rights nor the rights of others.

- Wafer Fab

Shanghai SIM-BCD Semiconductor Manufacturing Limited

800, Yi Shan Road, Shanghai 200233, China

Tel: +86-21-6485 1491, Fax: +86-21-5450 0008

BCD Semiconductor Manufacturing Limited

MAIN SITE

REGIONAL SALES OFFICE

Shenzhen Office

Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. Shenzhen Office

Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office

Room E, 5F, Noble Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China

Tel: +86-755-8826 7951

Fax: +86-755-8826 7865

Taiwan Office

BCD Semiconductor (Taiwan) Company Limited

4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,

Taiwan

Tel: +886-2-2656 2808

Fax: +886-2-2656 2806

USA Office

BCD Semiconductor Corporation

30920 Huntwood Ave. Hayward,

CA 94544, U.S.A

Tel : +1-510-324-2988

Fax: +1-510-324-2788

- IC Design Group

Advanced Analog Circuits (Shanghai) Corporation

8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China

Tel: +86-21-6495 9539, Fax: +86-21-6485 9673

BCD Semiconductor Manufacturing Limited

http://www.bcdsemi.com

BCD Semiconductor Manufacturing Limited

IMPORTANT NOTICE

BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-

cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any

particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or

other rights nor the rights of others.

- Wafer Fab

Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.

800 Yi Shan Road, Shanghai 200233, China

Tel: +86-21-6485 1491, Fax: +86-21-5450 0008

MAIN SITE

REGIONAL SALES OFFICE

Shenzhen Office

Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office

Unit A Room 1203, Skyworth Bldg., Gaoxin Ave.1.S., Nanshan District, Shenzhen,

China

Tel: +86-755-8826 7951

Fax: +86-755-8826 7865

Taiwan Office

BCD Semiconductor (Taiwan) Company Limited

4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,

Taiwan

Tel: +886-2-2656 2808

Fax: +886-2-2656 2806

USA Office

BCD Semiconductor Corp.

30920 Huntwood Ave. Hayward,

CA 94544, USA

Tel : +1-510-324-2988

Fax: +1-510-324-2788

- Headquarters

BCD Semiconductor Manufacturing Limited

No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China

Tel: +86-21-24162266, Fax: +86-21-24162277