AS432 Ultra 1.24V Precision Adjustable Shunt Regulator FEATURES APPLICATIONS • • • • • • • • • • • • • • Low Voltage Operation ........................................ 1.24V Trimmed Bandgap to ...................................0.5%/ 1% Wide Operating Current ................... 1mA to 100mA Extended Temperature Range ...............0°°C to 105°°C Adjustable Output Voltage...........................VREF to 18V Low Temperature Coefficient ....................... 50 ppm/°C Offered in TO-92, SOIC, SOT-89, SOT-23-3 & SOT-23-5 Improved Replacement in Performance for TLV431 3.0V to 3.3V Switching Power Supplies Adjustable Supplies Error Amplifiers Single Supply Amplifier Monitors / VCR / TV Personal Computers PRODUCT DESCRIPTION The AS432 is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate 1.24V bandgap reference with 0.5% tolerance. The AS432 thermal stability, wide operating current (80mA) and temperature range (0°C to 105°C) makes it suitable for abroad range of applications. AS432 tolerance of 0.5% is proven to be sufficient to overcome other errors in the system to virtually eliminate the need for trimming in the power supply manufactures assembly line and contribute a significant cost savings. The AS432 is an ideal voltage reference in an isolated feedback circuit for 3.0V to 3.3V switching mode power supplies. AS432 offers many advantages over TLV431, such as, wider output voltage up to 18V vs. 6V, output current of 80mA vs. 15mA, and a wider temperature range with tighter tolerance down to 0.5%. ORDERING INFORMATION Part Number AS432AN AS432AM1 AS432AS AS432AM AS432N AS432M1 AS432S AS432M Temperature Range 0°C to 105°C 0°C to 105°C 0°C to 105°C 0°C to 105°C 0°C to 105°C 0°C to 105°C 0°C to 105°C 0°C to 105°C PIN CONNECTIONS Package Type 8-Pin Surface Mount (S) TO-92 SOT-89 SO-8 SOT-23-3 TO-92 SOT-89 SO-8 SOT-23-3 CATHODE 1 ANODE 2 ANODE 3 N/C 4 AS432 TO-92 (N) REF 7 ANODE 6 ANODE 5 N/C ANODE 3 REF CATHODE ANODE Top View SOT-23-3 (M) 2 1 8 Bottom View SOT-23-5 (M5) ANODE AS432 SOT-89 (M1) REF AS432 AS432 1 REF CATHODE Top View N/C N/C CATHODE Top View 2 3 REF ANODE CATHODE Top View Rev. 10/5/00 AS432 MARKING INFORMATION CATHODE (K) [For SOT-23 (3 and 5 Pin) and SOT-89 only] Device AS432A AS432 Marking 4321 4322 REFERENCE (R) + 1.24V ANODE (A) ABSOLUTE MAXIMUM RATINGS Parameter Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current Continuous Power at 25°C TO-92 8L SOIC SOT-89 SOT-23 Junction Temperature Storage Temperature Lead Temperature (Soldering 10 sec.) Symbol VDA IAK IKA IREF PD TJ TSTG TL Rating 18 1 80 1 Units V A mA mA 775 750 1000 200 150 - 65 to +150 300 mW mW mW mW °C °C °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 VKA IK Rating VREF to 18 10 TYPICAL THERMAL RESISTANCES Unit V mA Package TO-92 SOIC SOT-89 SOT-23 θJA 160 °C/W 175 °C/W 110 °C/W 575 °C/W θJC 80 °C/W 45 °C/W 8 °C/W 150 °C/W Typical Derating 6.3 mW/°C 5.7 mW/°C 9.1 mW/°C 1.7 mW/°C Rev. 10/5/00 AS432 ELECTRICAL CHARACTERISTICS are guaranteed over the full junction temperature range (0°C to 105°C). Ambient temperature must be derated based upon power dissipation and package thermal characteristics. Unless otherwise specified, test conditions are: VKA = VREF and IK = 10mA. Test AS432A AS432 Parameter Symbol Circuit Test Condition Min Typ Max Min Typ Max Unit Output Voltage VREF 1 IK = 10mA, 1.2338 1.240 1.2462 1.2276 1.240 1.2524 V 1 Line Regulation Load Regulation Temperature Deviation Reference Input Current Reference Input Current Temperature Coefficient Minimum Cathode Current for Regulation Off State Leakage VREF VREF VREF IREF I REF 1 1 1 2 2 IK (MIN) 1 IK (MIN) 3 TJ = 25°C, VK = VREF VKA = 1.25V to 15V IK = 1 to 80mA 0 < TJ < 105°C 0 < TJ < 105°C VREF = 0V, VKA = 18V 19 3 2 3 0.3 37 6 6 6 0.6 19 3 2 3 0.3 37 6 6 6 0.6 mV mV mV µA µA 0.6 1 0.6 1 mA 0.04 500 0.04 500 nA mV % 0 ∆VREF ∆Τ -10 5000 TC in %/°C = 0.5 -20 ∆VREF (mV) TC in mV/°C = -55 -25 0 25 50 75 TC in ppm/°C = 100 125 ∆T A ∆VREF VREF at 25°C ) 0 ) 0 ppm Calculating Average Temperature Coefficient (TC) ) x 100 ∆T A ∆VREF VREF at 25°C ) x 10 6 ∆T A Temperature (°C) 0.06 mV/°C 0.002 %/°C 24 ppm/°C TEST CIRCUITS VIN VKA = VREF IREF IK VIN R1 (VREF) VKA IK VIN VKA IK (OFF) IREF R2 Figure 1a. Test Circuit 1 Figure 1b. Test Circuit 2 Figure 1c. Test Circuit 3 Rev. 10/5/00 AS432 TYPICAL APPLICATIONS +3.3V 0.1µF 470µF PHD 3055E +12V 500Ω 2.7V 140Ω 0.1µF 0.1µF 0.1µF AS432 120Ω INTEL I 740 1000µF *If the output voltage has noise, then please add a 0.1µF in between drain and gate of power MOSFET to reduce the noise. Rev. 10/5/00 AS432 PACKAGE DRAWING SOIC-8 (S) 4.0 (0.158) 3.8 (0.150) 5.2 (0.205) 4.6 (0.181) 6.2 (0.244) 5.8 (0.228) Pin 1 1.27 (0.50) BSC 1.75 (0.069) 1.35 (0.053) 0.78 (0.031) 0.61 (0.024) 5.0 (0.197) 4.8 (0.188) 0.37 (0.015) BSC 45° 0.77 (0.030) 0.64 (0.025) 7 °(4 PLCS) 3°-6° 0.56 (0.022) 0.49 (0.019) 0.45 (0.018) 0.35 (0.014) 0.20 (0.008) 0.10 (0.004) 0.22 (0.009) 0.19 (0.007) 7 °(4 PLCS) Rev. 10/5/00 AS432 PACKAGE DRAWING TO-92 (N) 0.090 (2.286) Radius typ. 2 1 3 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143) 10° typ. BOTTOM VIEW 0.185 (4.699) 0.045 (1.143) 0.085 (2.159) Diameter 5° typ. 0.185 (4.699) 0.175 (4.445) 0.090 (2.286) typ. 5° typ. Seating Plane 0.025 (0.635) Max Uncontrolled Lead Diameter 0.500 (12.70) Min. 0.016 (0.406) 0.014 (0.356) 0.0155 (0.3937) 0.0145 (0.3683) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) Rev. 10/5/00 AS432 PACKAGE DRAWING SOT-23-3L (M) 0.015 - 0.018 (0.381 - 0.457) 0.047 - 0.055 (1.194 - 1.397) 0.083 - 0.098 (2.108 - 2.489) 0.035 - 0.040 (0.889 - 1.016) 0.020 - 0.024 (0.508 - 0.610) 0.070 - 0.080 (1.778 - 2.032) 0.110 - 0.120 (2.794 - 3.048) 0.001 - 0.004 (0.025 - 0.102) 0.003 - 0.005 (0.076 - 0.127) 0.030 - 0.041 (0.762 - 1.041) 0.018 - 0.024 (0.457 - 0.610) Rev. 10/5/00 AS432 PACKAGE DRAWING SOT-23-5L (M5) D B (5 PLACES) H E e e1 A A2 A1 C SYMBOL L MIN. MAX MIN. MAX. A 0.90 1.30 .035 .051 A1 0 0.10 0 .004 A2 INCHES MILLIMETERS 0.80 REF .0315 REF B 0.30 0.50 .012 .019 C 0.10 0.35 .004 .0137 D 2.70 3.10 .106 .122 E 1.40 1.80 .055 .071 e 0.95 BSC. 1.70 2.10 .066 .082 H 2.50 3.00 .098 .118 MIN 0.2 1. REFER TO APPLICABLE 2. CONTROLLING DIMENTION : MILLIMETER 3. PACKAGE SURFACE FINISHING TO BE SMOOTH FINISH. .037 BSC. e1 L NOTE: MIN .0078 Rev. 10/5/00 AS432 PACKAGE DRAWING SOT-89 (M1) C A J N P 2 1 3 K B F D G -T- STYLE 1 PIN 1. BASE 2. COLLECTOR 3. EMITTER STYLE 3 PIN 1. GATE 2. ANODE 3. CATHODE STYLE 2 PIN 1. ANODE 2. CATHODE 3. NO CONNECTION STYLE 4 PIN 1. DRAIN 2. GATE 3. SOURCE DIM A B C D E F G J K L N P MILLIMETERS MIN MAX 4.40 4.60 2.29 2.60 140 160 0.36 0.48 1.62 1.80 0.44 0.53 150 BSC 0.35 0.44 0.80 1.04 300 BSC 2.04 2.28 3.94 4.25 INCHES MIN MAX 0.174 0.181 0.091 0.102 0.056 0.062 0.015 0.018 0.064 0.070 0.018 0.020 0.059 BSC 0.014 0.017 0.032 0.040 0.118 BSC 0.081 0.089 0.156 0.167 Rev. 10/5/00