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AS3431

Micropower SOT-23, 2.5V Precision

Adjustable Shunt Regulator

FEATURES

•

Voltage Tolerance

..................................0.5%

& 1.0%

Wide Operating Current

...................

1ma To 100mA

Extended Temperature Range

..........................

105°C

Low Temperature Coefficient ........................30 ppm/°C

Offered in SOT-23, TO-92 & SOT 89

Low Output Noise

APPLICATIONS

•

Battery Operating Equipment

Adjustable Supplies

Switching Power Supplies

Error Amplifiers

Single Supply Amplifier

Monitors / VCR / TV

Personal Computers

PRODUCT DESCRIPTION

The AS3431 is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate 0.5% bandgap reference. AS3431 acts as

an open-loop error amplifier with a 2.5V temperature compensation reference. The AS3431 thermal stability, wide operating current

(100mA) and temperature range (0°C to 105°C) makes it suitable for all variety of applications that are looking for a low cost solution

with high performance.

AS3431 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 manufactures assembly line and contribute a big Cost Savings.

In the standard shunt configuration, the combination of low temperature coefficient (T.C.), sharp turn-on characteristics, low output

impedance and programmable output voltage make this precision reference an excellent error amplifier.

The AS3431 is a direct replacement for the AS431 and TL431 in low voltage, low current applications. AS3431 is also available in

SOT-89 and TO-92.

ORDERING INFORMATION

TO-92

AS3431AN

AS3431N

SOT-23- 3-PIN

AS3431AM

AS3431M

SOT-89- 3-PIN

AS3431AM1

AS3431M1

TEMP RANGE

0°C to 105°C

Output Accuracy

0.5%

The AS3431AM is 0.5% tolerance and the marking on the pin should be “3431”

The AS3431M is 1% tolerance and the marking on the pin should be “3432”

PIN CONNECTIONS

SOT-23

Marking & pinout for

the 1% device

ANODE

TO-92 (N)

SOT-23

Marking & pinout for

the 0.5% device

ANODE

SOT-89

Marking &

pinout for all

devices

3431

CATHODE

ANODE

REF

CATHODE

REF

3432

3431

CATHODE

REF

CATHODE

ANODE

REF

Top View

Rev. 10/11/00

AS3431

CATHODE (K)

REFERENCE

(R)

2.5V

ABSOLUTE MAXIMUM RATINGS

Parameter

Cathode-Anode Reverse Breakdown

Anode-Cathode Forward Current

Operating Cathode Current

Reference Input Current

Continuous Power Dissipation at 25°C

SOT-23

Junction Temperature

Storage Temperature

Lead Temperature (Soldering 10 sec.)

Symbol

REF

STG

ANODE (A)

Rating

100

300

150

- 65 to 150

300

Units

°C

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.

RECOMMENDED CONDITIONS

Parameter

Cathode Voltage

Cathode Current

Symbol

Rating

REF

to 18

Unit

TYPICAL THERMAL RESISTANCES

Package

SOT-23

SOT-89

TO-92

575° C/W

150° C/W

80° C/W

Typical Derating

1.7 mW/°C

9.1 mW/°C

6.3 mW/°C

Rev. 10/11/00

AS3431

ELECTRICAL CHARACTERISTICS

are guaranteed over full junction temperature range (0°C to 105°C). Ambient

temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: V

= V

REF

and

= 10mA, unless otherwise specified.

AS3431A

AS3431

Parameter

Symbol Test Condition

Min

Typ

Max

Min

Typ

Max

Unit

Circuit

Reference Voltage

REF

2.490 2.503 2.515 2.475 2.500 2.525

= 25° C

Over Temp.

2.480

2.530 2.450

2.550

0.07

0.20

0.07

0.02

∆V

REF

with Temp*

mV/°C

Ratio of Change in V

REF

-2.7

-1.01

-2.7

-1.01

REF

to 10 V

∆V

REF

MV/V

to Cathode Voltage

10 V 10 18 V

-2

-0.4

0.3

-2

-0.4

0.3

∆V

Reference Input Current

REF

0.7

µA

REF

Temp Deviation

0.4

1.2

0.4

1.2

∆I

REF

µA

Min I

for Regulation

REF

= 0V

K (MIN)

0.4

= 18V

Off State Leakage

K (OFF)

0.04

500

0.04

500

Dynamic Output

f < 1 kHz I

0.15

0.5

0.15

0.5

Ω

Impedance

1 to 100mA

Calculating Average Temperature Coefficient (TC)

ppm

∆Τ

∆V

REF

TC in mV/°C =

∆V

REF

(mV)

∆T

∆V

REF

at 25°C

∆T

∆V

REF

at 25°C

∆T

2000

0.2

-5

TC in %/°C =

)

-10

90 105

TC in ppm/°C =

Temperature (°C)

0.019 mV/°C

0.001 %/°C

7.6 ppm/°C

)

x 100

x 10

Rev. 10/11/00

AS3431

Test Circuits

= V

REF

)

K (OFF)

Figure

1a. Test Circuit 1

Figure

1b. Test Circuit 2

Figure

1c. Test Circuit 3

Rev. 10/11/00

参数对比

与AS3431M1相近的元器件有：AS3431AM1、AS3431AMI、AS3431AM、AS3431AN、AS3431MI、AS3431M、AS3431N。描述及对比如下：

型号	AS3431M1	AS3431AM1	AS3431AMI	AS3431AM	AS3431AN	AS3431MI	AS3431M	AS3431N
描述	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, BIPolar, PSSO3, SOT-89, 3 PIN	Two Terminal Voltage Reference, 1 Output, 2.503V, Trim/Adjustable, BIPolar, PSSO3, SOT-89, 3 PIN	Analog Circuit,	Two Terminal Voltage Reference, 1 Output, 2.503V, Trim/Adjustable, PDSO3, SOT-23, 3 PIN	Two Terminal Voltage Reference, 1 Output, 2.503V, Trim/Adjustable, PBCY3, TO-92, 3 PIN	Analog Circuit,	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PDSO3, SOT-23, 3 PIN	Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, PBCY3, TO-92, 3 PIN
是否Rohs认证	不符合	不符合	不符合	不符合	不符合	不符合	不符合	不符合
厂商名称	SIPEX	SIPEX	SIPEX	SIPEX	SIPEX	SIPEX	SIPEX	SIPEX
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown	unknown	unknown	unknown
Base Number Matches	1	1	1	1	1	1	1	1
包装说明	SOT-89, 3 PIN	SOT-89, 3 PIN	-	SOT-23, 3 PIN	TO-92, 3 PIN	-	SOT-23, 3 PIN	TO-92, 3 PIN
模拟集成电路 - 其他类型	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE	-	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE	-	TWO TERMINAL VOLTAGE REFERENCE	TWO TERMINAL VOLTAGE REFERENCE
JESD-30 代码	R-PSSO-F3	R-PSSO-F3	-	R-PDSO-G3	O-PBCY-T3	-	R-PDSO-G3	O-PBCY-T3
湿度敏感等级	1	1	-	1	1	-	1	1
功能数量	1	1	-	1	1	-	1	1
输出次数	1	1	-	1	1	-	1	1
端子数量	3	3	-	3	3	-	3	3
最大输出电压	2.55 V	2.53 V	-	2.53 V	2.53 V	-	2.55 V	2.55 V
最小输出电压	2.45 V	2.48 V	-	2.48 V	2.48 V	-	2.45 V	2.45 V
标称输出电压	2.5 V	2.503 V	-	2.503 V	2.503 V	-	2.5 V	2.5 V
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY
封装形状	RECTANGULAR	RECTANGULAR	-	RECTANGULAR	ROUND	-	RECTANGULAR	ROUND
封装形式	SMALL OUTLINE	SMALL OUTLINE	-	SMALL OUTLINE, THIN PROFILE	CYLINDRICAL	-	SMALL OUTLINE, THIN PROFILE	CYLINDRICAL
峰值回流温度（摄氏度）	240	240	-	225	225	-	225	225
认证状态	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified
表面贴装	YES	YES	-	YES	NO	-	YES	NO
最大电压温度系数	30 ppm/°C	30 ppm/°C	-	30 ppm/°C	30 ppm/°C	-	30 ppm/°C	30 ppm/°C
端子形式	FLAT	FLAT	-	GULL WING	THROUGH-HOLE	-	GULL WING	THROUGH-HOLE
端子位置	SINGLE	SINGLE	-	DUAL	BOTTOM	-	DUAL	BOTTOM
处于峰值回流温度下的最长时间	NOT SPECIFIED	NOT SPECIFIED	-	NOT SPECIFIED	NOT SPECIFIED	-	NOT SPECIFIED	NOT SPECIFIED
微调/可调输出	YES	YES	-	YES	YES	-	YES	YES