AT431-GRE

AT431 AIMTRON | Alldatasheet

Document overview

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Technical content

Features

․Low-Voltage Operation: Down to 1.24V ․1% Reference-Voltage Tolerance ․Adjustable Output Voltage, Vo=Vref to 12V ․Low Operational Cathode Current….50 μA ․0.25Ω Typical Output Impedance ․SOT-23 and TO-92 Packages Application ․Linear Regulators ․Voltage Reference for Power Circuit

Description

The A T431 is lo w-voltage th ree-terminal adjustable voltag e referen ce with sp ecified thermal stab ility o ver app licable co mmercial temperature ranges. Output voltage may be set to any value between V ref (1 .24V) and 12V w ith two external resistors (see Figure 2). When used with an op tocoupler, th e AT431 is ideal vo ltage referen ce in iso lated feed back circuits for 1.8V to 12 V switching-mode power supplies. Thi s de vice has t ypical o utput impedance o f 0 .20Ω. Activ e ou tput circuitry provides a very s harp t urn-on c haracteristic, making the AT431 e xcellent replacem ents for low-voltage ze ner diodes i n many appl ications, including onbo ard regulation an d adj ustable power supplies. Block Diagram and Symbol Aimtron reserves the right without notice to change this circuitry and specifications.

Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator 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 WWW : http://www.aimtron.com.tw 2/8/2006 REV :1.1 Email: service@aimtron.com.tw Equivalent Schematic Pin Assignments

Ordering Information

Part number Package Marking AT431Z TO-92 Date Code AT431UN 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

Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator 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 WWW : http://www.aimtron.com.tw 2/8/2006 REV :1.1 Email: service@aimtron.com.tw Absolute maximum ratings (TA = 25oC) Parameter Symbol Limits unit Cathode voltage VKA 12 V Continuous cathode current range IK -20~20 mA Reference Current IREF -0.05~3 mA Operating temperature TOPR -30~+85 oC Storage temperature TSTG -55~+150 oC SOT-23-5 SOT-23-3 347 Package thermal impedance θJA TO-92 156 oC / W Power Dissipation PD (TJ(max)-TA)/ θJA 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 Max unit Cathode voltage VKA Vref 12 V Continuous cathode current range IK 0.05 15 mA Operating free-air temperature range TA 0 70 oC Electrical characteristics (unless otherwise noted) Parameter Symbol Min. Typ. Max. Unit Conditions Vref (TA = 25oC) 1.228 1.24 1.252 V Reference Voltage Vref (TA = full range 0~70 oC) 1.221 - 1.259 V VKA= Vref IK=10mA (Figure 1) Vref deviation over full temperature range Vref(dev) - 4 20 mV VKA= Vref IK=10mA (Figure 1) Ratio of Vref change in cathode voltage change ∆ Vref /∆ VKA - -1.5 -2.7 mV/V VKA= Vref to 12V IK=10mA (Figure 2) Reference terminal current Iref - 0.15 0.5 µA IK=10mA R1=10KΩ (Figure 2) Iref deviation over full temperature range Iref(dev) - 0.05 0.3 µA IK=10mA R 1=10KΩ R2=open (Figure 2) Minimum cathode current for regulation IK(min) - 40 50 µA VKA= Vref (Figure 1) Off-state cathode current IK(off) - 0.001 0.1 µA VKA=12V Vref =0V (Figure 3) Dynamic impedance | ZKA | - 0.20 0.4 Ω VKA= Vref f≤1KHz IK=0.1mA to 15mA (Figure 1) * The dynamic impedance is defined as : |ZKA| = ∆ VKA /∆ IKA

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Figure 4. Figure 5.

Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator 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 WWW : http://www.aimtron.com.tw 2/8/2006 REV :1.1 Email: service@aimtron.com.tw Application Circuit

Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator 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 WWW : http://www.aimtron.com.tw 2/8/2006 REV :1.1 Email: service@aimtron.com.tw Above shows the AT4311 used in a 3.3V isolated flyback supply. Output voltage Vo can be as low as reference voltage Vref (1.24V±1%). The output of the regulator, plus the forward voltage drop of the optocoupler LED (1.24+1.4=2.64V), determine the minimum voltage that can be regulated in a n iso lated in a n iso lated supply configuration. Regulated voltage as low as 2.7V is possible using the circuit.

Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator 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 WWW : http://www.aimtron.com.tw 2/8/2006 REV :1.1 Email: service@aimtron.com.tw

Package Information

A 0.787 1.194 0.031 0.047 A1 0.025 0.127 0.001 0.005 B 0.356 0.559 0.014 0.022 C 0.086 0.152 0.0034 0.006 D 2.667 3.048 0.105 0.120 E 1.194 1.397 0.047 0.055 E 1.778 2.032 0.070 0.080 H 2.083 2.489 0.082 0.098 L 0.102 0.305 0.004 0.012 S 0.432 0.559 0.017 0.022 R 0

Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator 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 WWW : http://www.aimtron.com.tw 2/8/2006 REV :1.1 Email: service@aimtron.com.tw TO-92 MILLIMETERS INCHES SYMBOL MIN MAX MIN MAX A 3.4 3.8 0.134 0.150 B 0.3 0.5 0.012 0.020 C 4.4 4.8 0.173 0.189 D 4.4 4.8 0.173 0.189 E 0.9 1.5 0.035 0.059 e 1.17 1.37 0.046 0.054 e1 2.39 2.69 0.094 0.106 L 12 16 0.472 0.630

Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Regulator 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 WWW : http://www.aimtron.com.tw 2/8/2006 REV :1.1 Email: service@aimtron.com.tw Reflow Profiles Sn-Pb Eutectic Assembly Pb-Free Assembly Profile Feature Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness <2.5mm or Pkg. volume <350mm3 Large Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Small Body Pkg. thickness ≥2.5mm or Pkg. volume ≥350mm3 Average ramp-up rate (TL to TP) 3°C/second max. 3°C/second max. Preheat - Temperature Min(Tsmin) -T emperature Max (Tsmax) -T ime (min to max)(ts) 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds Tsmax to TL - Ramp-up Rate 3°C/second max. Time maintained above: -T emperature (TL) -T ime (tL) 183°C 60-150 seconds 217°C 60-150 seconds Peak Temperature(TP) 225+0/-5°C 240+0/-5°C 245+0/-5°C 250+0/-5°C Time within 5°C of actual Peak Temperature (tP) 10-30 seconds 10-30 seconds 10-30 seconds 20-40 seconds Ramp-down Rate 6°C/second max. 3°C/second max. Time 25°C to Peak Temperature 6 minutes max. 8 minutes max. *All temperatures refer to topside of the package, measured on the package body surface.