= ayy ALPHA ~ Q: a SEMICONDUCTOR _~ Excellence in Analog Power Products AS4040 Precision Micropower 2.5V Shunt Voltage Reference FEATURES Low temperature coefficient 100 ppm/C e Operating current range 100UA to 15 mA Low power, 250 mW @ Iin=100 mA Two terminal "Zener" operation e Small package: SOT - 23, TO-92, and SO-8 e Fixed reverse breakdown voltage 2.5 Volt No output capacitance required Similar replacement for LM4040 APPLICATIONS Constant Current Source Digital Voltmeter Power Supply Monitor * Precision Regulators Battery-Powered Equipment Instrumentation e Automotive Electronics Data Acquisition Systems e Energy Management PRODUCT DESCRIPTION The AS4040 is a two-terminal, temperature compensated, band-gap voltage reference, which provides a fixed 2.5V output for input currents between 100 WA to 15mA. The bandgap voltage (2.5V) is independently trimmed from the output voltage to achieve a very low tempco. This trimming technique process gives a very stable device over the full temperature range (A grade 50 ppm/ C). The AS4040 is available in the sub-miniature (3mm X 1.3mm) SOT-23, SO-8 surface mount package, or TO-92 package. The operating temperature is -40C to 85C. The ALPHA Semiconductor AS4040 advanced design eliminates the need for an external stabilized capacitor while insuring stability with any capacitive load, making them easy to use. ORDERING INFORMATION Part Number Package Type AS4040YN-X-V TO-92 AS4040YS-X-V SO-8 Y= AS4040YM-X-V SOT-23 Note: Consult factory for lower tempco and tolerance. 8-Pin Surface Mount (S) Temperature Coef. Output Accuracy Reverse Breakdown Voltage 1=0.5% A=100ppm/C_ | X= | 5-1y,- v= | 25=2.5V B=150ppm/C 3-2% 5.0=5.0V PIN CONNECTIONS SOT-23-3 (M) TO-92 (N) 8 2 nec Gi + +O ne (]2 1 Nc i 1 -o . ne CE}; 6) nc 3 Bottom View - oR 5 Ey nec Top View Top View Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: 925-417-1391 Fax: 925-417-1390 Rev.9/3/99ABSOLUTE MAXIMUM RATINGS Reverse Current Forward Current Storage Temperature Lead Temperature (Soldering) Power Dissipation at 25C M Package N Package S Package Temperature Range AS4040 ELECTRICAL CHARACTERISTICS (AS4040-2.5V) Electrical Characteristics at In = 1000UWA, and T, = +25C unless otherwise noted. . Boldface limits apply over temperature AS4040A-1 AS4040B-1 AS4040C-1 Units Parameters Conditions Min Typ Max Min Typ Max Min Typ Max Reverse Breakdown | IR=500 WA 2.500 2.500 2.500 Vv Voltage Reverse Breakdown | IR=500 WA +12 +12 +12 mV tolerance +29 +29 +29 mV Output Impedance 0.60 2 0.60 2 0.60 2 Q 0.3 0.9 0.3 1.1 0.3 1.1 Noise Voltage 0.1KHz<f <10Hz 15 15 15 LV p-p Tempco Note 1 100 150 150 ppm/C Turn-on Setting 0.1% of Vout 30 30 30 [Sec Operating Current Note 2 0.1 15 0.1 15 0.1 15 mA Range Temp. Range -40 85 -40 85 -40 85 C AS4040A-2 AS4040B-2 AS4040C-2 Units Parameters Conditions Min Typ Max Min Typ Max Min Typ Max Reverse Breakdown | IR=500 WA 2.500 2.500 2.500 Vv Voltage Reverse Breakdown | IR=500 WA +25 425 +25 mV Tolerance +49 +49 +49 mV Output Impedance 0.60 2 0.60 2 0.60 2 Q Noise Voltage 0.1KHz<f <10Hz 15 15 15 LV p-p Tempco Note 1 50 100 150 ppm/C Turn-on Setting 0.1% of Vout 30 30 30 [Sec Operating Current Note 2 0.1 15 0.1 15 0.1 15 mA Range Temp. Range -40 85 -40 85 -40 85 C AS4040A-3 AS4040B-3 AS4040C-3 Units Parameters Conditions Min Typ Max Min Typ Max Min Typ Max Reverse Breakdown | IR=500 WA 2.500 2.500 2.500 Vv Voltage Reverse Breakdown | IR=500 WA +50 +50 +50 mV Tolerance +74 +74 +74 mV Output Impedance 0.60 2 0.60 2 0.60 2 Q Noise Voltage 0.1KHz<f <10Hz 15 15 15 LV p-p Tempco Note 1 50 100 150 ppm/C Turn-on Setting 0.1% of Vout 30 30 30 [Sec Operating Current Note 2 0.1 15 0.1 15 0.1 15 mA Range Temp. Range -40 85 -40 85 -40 85 C Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: 925-417-1391 Fax: 925-417-1390 Rev.9/3/99ELECTRICAL CHARACTERISTICS (AS4040-5.0V) AS4040 Electrical Characteristics at In = 1000UWA, and T, = +25C unless otherwise noted. . Boldface limits apply over temperature AS4040A-1 AS4040B-1 AS4040C-1 Units Parameters Conditions Min Typ Max Min Typ Max Min Typ Max Reverse Breakdown | IR=500 WA 5.000 5.000 5.000 Vv Voltage Reverse Breakdown | IR=500 WA +24 +24 +24 mV tolerance +58 +58 +58 mV Output Impedance 0.60 2 0.60 2 0.60 2 Q 0.3 0.9 0.3 1.1 0.3 1.1 Noise Voltage 0.1KHz<f <10Hz 15 15 15 LV p-p Tempco Note 1 100 150 150 ppm/C Turn-on Setting 0.1% of Vout 30 30 30 [Sec Operating Current Note 2 0.175 15 0.175 15 0.175 15 mA Range Temp. Range -40 85 -40 85 -40 85 C AS4040A-2 AS4040B-2 AS4040C-2 Units Parameters Conditions Min Typ Max Min Typ Max Min Typ Max Reverse Breakdown | IR=500 WA 5.000 5.000 5.000 Vv Voltage Reverse Breakdown | IR=500 WA +50 +50 +50 mV Tolerance +98 +98 +98 mV Output Impedance 0.60 2 0.60 2 0.60 2 Q Noise Voltage 0.1KHz<f <10Hz 15 15 15 LV p-p Tempco Note 1 50 100 150 ppm/C Turn-on Setting 0.1% of Vout 30 30 30 [Sec Operating Current Note 2 0.175 15 0.175 15 0.175 15 mA Range Temp. Range -40 85 -40 85 -40 85 C AS4040A-3 AS4040B-3 AS4040C-3 Units Parameters Conditions Min Typ Max Min Typ Max Min Typ Max Reverse Breakdown | IR=500 WA 5.000 5.000 5.000 Vv Voltage Reverse Breakdown | IR=500 WA +100 +100 +100 mV Tolerance +148 +148 +148 mV Output Impedance 0.60 2 0.60 2 0.60 2 Q Noise Voltage 0.1KHz<f <10Hz 15 15 15 LV p-p Tempco Note 1 50 100 150 ppm/C Turn-on Setting 0.1% of Vout 30 30 30 [Sec Operating Current Note 2 0.175 15 0.175 15 0.175 15 mA Range Temp. Range -40 85 -40 85 -40 85 C Note: 1) Three-point measurement guarantees the error band over the specified temperature range. 2) Optimum performance is obtained at currents below 1000 WA. 3) Limits are 100% production tested at 25C. Limits over temperature are guaranteed through correlation using statistical quality control. Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: 925-417-1391 Fax: 925-417-1390 Rev.9/3/99AS4040 Applications Hints This device is designed for stable operation and has no need of an external capacitor between pin 4 and 8. The reference remains stable if a bypass capacitor is used. SOT-23 The AS4040 in the SOT-23 package has a parasitic Schottky diode between pin 3 and pin 1. Pin 1 of SOT-23 must float or be connected to pin 3. Conventional Shunt Regulator In a conventional shunt regulator application (see Figure 1), an external series resister (Rs) 1s connected between the supply voltage and the AS4040. Rg determines the current that flows through the load (I,) and the reference(Ig). Since load current and supply voltage may vary, Rs should be small enough to supply at least the minimum acceptable Ig to the reference even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and [, is at its minimum, Rs should be large enough so that the current flowing through the AS4040 is less than 15mA Rg is determined by the supply voltage (Vs), the load and operating current (I, and Ig), references reverse breakdown voltage (Vp). Rs = (Vs - Vey/U+tIQ) AS4040 Figure 1. AS4040 Fixed Shunt Regulator Application AS4040 Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: 925-417-1391 Fax: 925-417-1390 Rev.9/3/99PACKAGE DRAWING 8-PIN SOIC (S) oA AS4040 rt 0 (0.158) 2 (0.205) 6.2 (0.244) 8 (0.150) 6 (0.181) HE 1.27 (0.50) Bsc 5.0 (0.197) 4.8 (0.188) =e 5.8 (0.228) 1.75 (0.069) 1.35 (0.053) 0.78 (0.031) 0.61 (0.024) 45 0.37 (0072) 5S 7 Son 0.77 (0.030) 0.64 (0.025) (4 PLCS) 0.56 (0.022) 0.49 (0. 078) 0.45 (0.018) . . 0.35 (0.014) ty 1 3-6 | i 0.22 (0.009) 0.20 (0.008) 0.19 (0.007) 0.10 (0.004) =a 7(4 PLCS) Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: 925-417-1391 Fax: 925-417-1390 Rev.9/3/99AS4040 DRAWING PACKAGE SOT-23-3L (M) 0.015 - 0.018 (0.381 - 0.457) | | 0.047 -0.055 0.083 - 0.098 (1.194 - 1.397) (2.108 - 2.489) ] pl 0.035 - 0.040 | (0.889 - 1.016) 0.020 -0.024 | 0,070 - 0.080 (0.508 - 0.610) (1.778 - 2.032) 0.110 - 0.120 ~ ~ 0,003 - 0.005 (2.794 - 3.048) | (0.076 - 0.127) gL | a 1 t 4 ST 0.001 - 0.004 0.030 - 0.041 _.] LL 0.018 - 0.024 (0.025 - 0.102) (0.762 - 1.041) (0.457 - 0.610) Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: 925-417-1391 Fax: 925-417-1390 Rev.9/3/99PACKAGE DRAWING TO-92 (N) 0.090 (2.286) Radius typ. AS4040 0.135 (3.429) 2 1 3 0.145 (3.683) 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 0.185 (4.699) 0.175 (4.445) 0.090 (2.286) typ. ! ! ~ Vv 5 typ. Seating Plane _ 0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) i 0.105 (2.667) 0.095 (2.413) 0.025 (0.635) Max Uncontrolled Lead Diameter 0.500 (12.70) Min. A 5 typ. ot _~ = _ 0.0155 (0.3937) 0.0145 (0.3683) Alpha Semiconductor Inc. 1031 Serpentine Lane. Pleasanton, CA 94566 Tel: 925-417-1391 Fax: 925-417-1390 Rev.9/3/99