AT431UN [AIMTRON]

1.24V low-Voltage Adjustable Precision Shunt Regulator; 1.24V低电压可调精密并联稳压器


型号：	AT431UN
厂家：	AIMTRON TECHNOLOGY
描述：	1.24V low-Voltage Adjustable Precision Shunt Regulator 1.24V低电压可调精密并联稳压器稳压器
文件：	总11页 (文件大小：328K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AT431

Preliminary Product Information

1.24V low-Voltage Adjustable Precision

Shunt Regulator

Features

Description

The AT431 is low-voltage three-terminal

adjustable voltage reference with specified

thermal stability over applicable commercial

temperature ranges. Output voltage may be set to

․Low-Voltage Operation: Down to 1.24V

․1% Reference-Voltage Tolerance

․Adjustable Output Voltage, Vo=V

ref to 12V

․Low Operational Cathode Current….50μA

․0.25Ω Typical Output Impedance

․SOT-23 and TO-92 Packages

any value between V

(1.24V) and 12V with

ref

two external resistors (see Figure 2).

When used with an optocoupler, the AT431 is

ideal voltage reference in isolated feedback

circuits for 1.8V to 12 V switching-mode power

supplies. This device has typical output

impedance of 0.20Ω. Active output circuitry

provides a very sharp turn-on characteristic,

making the AT431 excellent replacements for

low-voltage zener diodes in many applications,

including onboard regulation and adjustable

power supplies.

Application

․Linear Regulators

․Voltage Reference for Power Circuit

Block Diagram and Symbol

Aimtron reserves the right without notice to change this circuitry and specifications.

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Equivalent Schematic

Pin Assignments

Ordering Information

Part number

Package

Marking

AT431Z

AT431UN

TO-92

SOT-23

Date Code

AT431UN_GRE

SOT-23, Green

,Date Code with one bottom line

: Date Code

*For more marking information, contact our sales representative directly

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Absolute maximum ratings (T = 25^oC)

Parameter

Cathode voltage

Symbol

Limits

unit

Continuous cathode current range

Reference Current

-20~20

-0.05~3

REF

T_OPR

T_STG

Operating temperature

Storage temperature

-30~+85

-55~+150

347

^oC

SOT-23-5

SOT-23-3

TO-92

^oC / W

Package thermal impedance θ

156

Power Dissipation

(T (max)-T )/ θ

Stresses beyond those listed under “ absolute maximum ratings” may cause permanent damage to the

device. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Recommend operating condtion

Parameter

min

Vref

0.05

Max

unit

Cathode voltage V

Continuous cathode current range I

^oC

Operating free-air temperature range T_A

Electrical characteristics (unless otherwise noted)

Parameter

Reference Voltage

Symbol

Min. Typ. Max.

1.228 1.24 1.252

Unit

Conditions

(TA = 25^oC)

= V

ref

I =10mA

(Figure 1)

(TA = full

1.221

1.259

range 0~70 C)

deviation over full

= V

ref

ref(dev)

I =10mA

temperature range

(Figure 1)

Ratio of V change in

ref

cathode voltage change

-1.5

0.15

0.05

-2.7 mV/V V = V

∆ V /∆ V

KA ref to 12V

ref

I =10mA

(Figure 2)

Reference terminal

current

0.5

0.3

I =10mA

µA

ref

R1=10KΩ

deviation over full

µA I =10mA R1=10KΩ

ref

temperature range

ref(dev)

R2=open

(Figure 2)

Minimum cathode current I

for regulation

= V

(Figure 1)

µA

K(min)

K(off)

ref

Off-state cathode current

0.001

0.1

=12V

ref

=0V

= V

(Figure 3)

Dynamic impedance

| Z

0.20

0.4

Ω

ref f≤1KHz

I =0.1mA to 15mA

(Figure 1)

* The dynamic impedance is defined as : |Z

| = ∆ V

/∆ I

KA KA

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Parameter Measurement Information

Figure 2. Test Circuit for V >V

KA ref

Figure 1. Test Circuit for V =V

KA ref

V = V =V *(1+R1/R2)+I

ref *

KA ref

V = V =V

O KA ref

Figure 3. Test Circuit for I

K(off)

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Figure 4.

Figure 5.

Figure 6.

Figure 7.

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Figure 8.

Figure 9.

Figure 10.

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Application Circuit

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Above shows the AT4311 used in a 3.3V isolated flyback supply. Output voltage Vo can be as low

as reference voltage V (1.24V±1%). The output of the regulator, plus the forward voltage drop

ref

of the optocoupler LED (1.24+1.4=2.64V), determine the minimum voltage that can be regulated

in an isolated in an isolated supply configuration. Regulated voltage as low as 2.7V is possible

using the circuit.

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Package Information

SOT-23

MILLIMETERS

MIN MAX

INCHES

SYMBOL

MIN

MAX

0.787

0.025

0.356

0.086

2.667

1.194

1.778

2.083

0.102

0.432

0^。

1.194

0.127

0.559

0.152

3.048

1.397

2.032

2.489

0.305

0.559

8^。

0.031

0.001

0.014

0.0034

0.105

0.047

0.070

0.082

0.004

0.017

0^。

0.047

0.005

0.022

0.006

0.120

0.055

0.080

0.098

0.012

0.022

8^。

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

TO-92

MILLIMETERS

INCHES

SYMBOL

MIN

MAX

MIN

MAX

3.4

0.3

4.4

0.9

1.17

2.39

3.8

0.5

4.8

1.5

1.37

2.69

0.134

0.012

0.173

0.035

0.046

0.094

0.472

0.150

0.020

0.189

0.059

0.054

0.106

0.630

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431

Preliminary Product Information

1.24V Low-Voltage Adjustable Precision

Shunt Regulator

Reflow Profiles

Profile Feature

Sn-Pb Eutectic Assembly

Pb-Free Assembly

Large Body

Small Body

Pkg. thickness <2.5mm

or Pkg. volume <350mm³

Pkg. thickness ≥2.5mm

or Pkg. volume ≥350mm³

Pkg. thickness ≥2.5mm or

Pkg. volume ≥350mm³

Pkg. thickness ≥2.5mm

or Pkg. volume ≥350mm³

Average ramp-up rate

3°C/second max.

(T to T )

Preheat

-Temperature Min(Tsmin)

-Temperature Max (Tsmax)

-Time (min to max)(ts)

100°C

150°C

200°C

60-120 seconds

60-180 seconds

3°C/second max.

Tsmax to T

-Ramp-up Rate

Time maintained above:

-Temperature (T )

183°C

217°C

60-150 seconds

-Time (t )

Peak Temperature(T )

225+0/-5°C

10-30 seconds

240+0/-5°C

245+0/-5°C

10-30 seconds

250+0/-5°C

10-30 seconds

20-40 seconds

Time within 5°C of actual Peak

Temperature (t )

Ramp-down Rate

6°C/second max.

6 minutes max.

3°C/second max.

8 minutes max.

Time 25°C to Peak Temperature

*All temperatures refer to topside of the package, measured on the package body surface.

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

2/8/2006 REV:1.1

Fax: 886-3-563-0879

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

AT431UN [AIMTRON]

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