at431un-gre Aimtron Technology, at431un-gre Datasheet

no-image

at431un-gre

Manufacturer Part Number
at431un-gre
Description
1.24v Low-voltage Adjustable Precision Shunt Regulator
Manufacturer
Aimtron Technology
Datasheet
Features
․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
Application
․Linear Regulators
․Voltage Reference for Power Circuit
Block Diagram and Symbol
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
Aimtron reserves the right without notice to change this circuitry and specifications.
Fax: 886-3-563-0879
1.24V low-Voltage Adjustable Precision
1
Description
The
adjustable voltage reference with specified
thermal stability over applicable commercial
temperature ranges. Output voltage may be set to
any value between V ref (1.24V) and 12V with
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.
Preliminary Product Information
AT431
WWW:
Email:
is
low-voltage
http://www.aimtron.com.tw
service@aimtron.com.tw
Shunt Regulator
three-terminal
AT431

Related parts for at431un-gre

at431un-gre Summary of contents

Page 1

Features ․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 Application ․Linear Regulators ․Voltage Reference for Power Circuit Block Diagram and Symbol ...

Page 2

... Equivalent Schematic Pin Assignments Ordering Information Part number Package AT431Z AT431UN SOT-23 AT431UN_GRE SOT-23, Green : 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 Fax: 886-3-563-0879 2/8/2006 REV:1.1 Preliminary Product Information 1 ...

Page 3

Absolute maximum ratings ( Parameter Cathode voltage Continuous cathode current range Reference Current Operating temperature Storage temperature Package thermal impedance θ JA Power Dissipation Stresses beyond those listed under “ absolute maximum ratings” may cause permanent damage ...

Page 4

Parameter Measurement Information Figure 1. Test Circuit for ref ref 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 2/8/2006 REV:1.1 Preliminary Product Information 1.24V ...

Page 5

Figure 4. Figure 6. 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 2/8/2006 REV:1.1 Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator Figure 7. WWW: http://www.aimtron.com.tw Email: service@aimtron.com.tw 5 AT431 Figure 5. ...

Page 6

Figure 8. 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 2/8/2006 REV:1.1 Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Figure 10. WWW: http://www.aimtron.com.tw Email: 6 AT431 Shunt Regulator Figure 9. service@aimtron.com.tw ...

Page 7

Application Circuit 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 2/8/2006 REV:1.1 Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator WWW: http://www.aimtron.com.tw Email: service@aimtron.com.tw 7 AT431 ...

Page 8

Above shows the AT4311 used in a 3.3V isolated flyback supply. Output voltage Vo can be as low as reference voltage V ref (1.24V±1%). The output of the regulator, plus the forward voltage drop of the optocoupler LED (1.24+1.4=2.64V), determine ...

Page 9

Package Information SOT-23 MILLIMETERS SYMBOL MIN A 0.787 A1 0.025 B 0.356 C 0.086 D 2.667 E 1.194 E 1.778 H 2.083 L 0.102 S 0.432 。 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. ...

Page 10

TO-92 MILLIMETERS SYMBOL MIN A 3.4 B 0.3 C 4.4 D 4.4 E 0.9 e 1. 7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 2/8/2006 REV:1.1 Preliminary Product Information ...

Page 11

Reflow Profiles Profile Feature Average ramp-up rate ( Preheat -Temperature Min(Tsmin) -Temperature Max (Tsmax) -Time (min to max)(ts) Tsmax -Ramp-up Rate Time maintained above: -Temperature ( -Time ( ...

Related keywords