AS4041 Precision Micropower 1.24V Shunt Voltage Reference FEATURES APPLICATIONS • Low temperature coefficient 50 ppm/°C • Operating current range 100µA to 15 mA • Low power, 250 mW @ IIN =100 mA • Two terminal "Zener" operation • Small package: SOT - 23, TO-92, and SO-8 • Fixed reverse breakdown voltage 2.5 Volt • No output capacitance required • Output voltage tolerance ± 0.5% • Constant Current Source • Digital Voltmeter • Power Supply Monitor • Precision Regulators • Battery-Powered Equipment • Instrumentation • Automotive Electronics • Data Acquisition Systems • Energy Management PRODUCT DESCRIPTION The AS4041 is a two-terminal, temperature compensated, band-gap voltage reference, which provides a fixed 1.24V output for input currents between 500 µA to 5mA. The bandgap voltage (1.24V) is independently laser trimmed from the output voltage to achieve a very low tempco, then the output voltage is laser trimmed to 1.24 volts. This trimming technique and the low tempco (A grade 50 ppm/ °C) thin film resistor process gives a very stable device over the full temperature range. The AS4041 is available in the subminiature (3mm × 1.3mm) SOT-23, SO-8 surface mount package, or TO-92 package. The operating temperature is -40°C to 85°C. The ALPHA Semiconductor AS4041 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 Tempco Package Type AS4041YN-X TO-92 AS4041YS-X SO-8 AS4041YM-X SOT-23 1. For lower Tempco, consult factory Y= A=100ppm/°C B=150ppm/°C Output Accuracy 2=1% 3=2% X= PIN CONNECTIONS 8-Pin Surface Mount (S) N/C 1 8 + N/C 2 7 N/C N/C 3 6 N/C 4 5 N/C - TO-92 (N) SOT-23-3 (M) + 1 2 2 3 1 - Bottom View 3 Top View Top View Rev. 10/11/00 AS4041 ABSOLUTE MAXIMUM RATINGS Reverse Current................................................................20mA Forward Current ...............................................................10mA Storage Temperature ...................................... -65°C to +150°C Lead Temperature (Soldering) ........................................ 300°C Power Dissipation at 25°C M Package ...................................................... 300mW N Package ....................................................... 550mW S Package........................................................ 525mW Temperature Range ................................... -40°C ≤ TA ≤ +85°C ELECTRICAL CHARACTERISTICS Electrical Characteristics at IIN = 1000µA, and TA = +25°C unless otherwise noted. . Boldface limits apply over temperature. AS4041A-2 AS4041B-2 Units Parameters Conditions Min Typ Max Min Typ Max Reverse Breakdown Voltage Reverse Breakdown Tolerance Output Impedance Noise Voltage Tempco Turn-on Setting Operating Current Range Temp. Range 1.24 IR=500 µA IR=500 µA 0.1kHz≤f ≤10Hz Note 1 0.1% of VOUT Note 2 0.60 15 Conditions Reverse Breakdown Voltage Reverse Breakdown Tolerance Output Impedance Noise Voltage Tempco Turn-on Setting Operating Current Range Temp. Range IR=500 µA 0.60 15 50 0.5 V ±25 ±49 2 100 30 5 15 85 0.5 5 15 85 -40 mV mV Ω µV p-p ppm/°C µSec mA °C AS4041A-3 Min Typ Max AS4041B-3 Min Typ Max Units 1.24 1.24 V IR=500 µA 0.1kHz≤f ≤10Hz Note 1 0.1% of VOUT Note 2 ±25 ±49 2 30 -40 Parameters 1.24 0.60 15 ±50 ±74 2 0.60 15 50 100 30 0.1 -40 ±50 ±74 2 30 5 15 85 0.1 -40 5 15 85 mV mV Ω µV p-p ppm/°C µSec mA °C Rev. 10/11/00 AS4041 Note: 1) Three-point measurement guarantees the error band over the specified temperature range. 2) Optimum performance is obtained at currents below 1000 µA. 3) Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through correlation using statistical quality control. AS4041 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. Figure 1. AS4041 Fixed Shunt Regulator Application SOT-23 The AS4041 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) is connected between the supply voltage and the AS4041. RS determines the current that flows through the load (IL) and the reference(IQ). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IQ 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 IL is at its minimum, RS should be large enough so that the current flowing through the AS4041-x.x is less than 15mA VS RS I O + IL IL VR VO IQ AS4041 RS is determined by the supply voltage (VS), the load and operating current (IL and IQ), reference’s reverse breakdown voltage (VR). RS = (VS - VR)/(IL+IQ) Rev. 10/11/00 AS4041 DRAWING PACKAGE 8-PIN SOIC (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. 10/4/00 AS4041 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) 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. 10/4/00 AS4041 DRAWING PACKAGE 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. 10/4/00