AS4040 Precision Micropower 2.5V Shunt Voltage Reference FEATURES APPLICATIONS • Low temperature coefficient 100 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 • Similar replacement for LM4040 • Constant Current Source • Digital Voltmeter • Power Supply Monitor • Precision Regulators • Battery-Powered Equipment • Instrumentation • Automotive Electronics • Data Acquisition Systems • 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 µA 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 × 1.3mm) SOT-23, SO-8 surface mount package, or TO-92 package. The operating temperature is -40°C to 85°C. The 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 AS4041YN-X AS4041YS-X AS4041YM-X Temperature Coef. Package Type TO-92 SO-8 SOT-23 Output Accuracy Y= A=100ppm/°C B=150ppm/°C X= Note: Consult factory for lower tempco and tolerance. 1=0.5% 2=1% 3=2% Reverse Breakdown Voltage 2.5 = 2.5V 5.0 = 5.0V V= 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 AS4040 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 (AS4040-2.5V) Electrical Characteristics at IIN = 1000µA, and TA = +25°C unless otherwise noted. . Boldface limits apply over temperature AS4040A-2 AS4040B-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 2.500 IR=500 µA IR=500 µA 0.1KHz≤f ≤10Hz Note 1 0.1% of VOUT Note 2 Parameters 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 ±25 ±49 2 0.60 15 50 V ±25 ±49 2 100 30 30 0.1 15 0.1 15 -40 85 -40 85 AS4040A-3 Min Typ Max AS4040B-3 Min Typ Max 2.500 2.500 mV mV Ω µV p-p ppm/°C µSec mA °C Units V 0.1 15 0.1 15 mV mV Ω µV p-p ppm/°C µSec mA -40 85 -40 85 °C IR=500 µA 0.1KHz≤f ≤10Hz Note 1 0.1% of VOUT Note 2 2.500 0.60 15 ±50 ±74 2 0.60 15 50 ±50 ±74 2 100 30 30 Rev. 10/11/00 AS4040 ELECTRICAL CHARACTERISTICS (AS4040-5.0V) Electrical Characteristics at IIN = 1000µA, and TA = +25°C unless otherwise noted. . Boldface limits apply over temperature AS4040A-1 AS4040B-1 AS4040C-1 Parameters Conditions Min Typ Max Min Typ Max Min Typ Max Reverse Breakdown Voltage Reverse Breakdown tolerance Output Impedance IR=500 µA Noise Voltage Tempco Turn-on Setting Operating Current Range Temp. Range 0.1KHz≤f ≤10Hz Note 1 0.1% of VOUT Note 2 Parameters Conditions Reverse Breakdown Voltage Reverse Breakdown Tolerance Output Impedance Noise Voltage Tempco Turn-on Setting Operating Current Range Temp. Range IR=500 µA Parameters Conditions Reverse Breakdown Voltage Reverse Breakdown Tolerance Output Impedance Noise Voltage Tempco Turn-on Setting Operating Current Range Temp. Range IR=500 µA Note: 5.000 IR=500 µA 0.60 0.3 15 0.60 0.3 15 5.000 ±24 ±58 2 1.1 0.60 0.3 15 150 30 V 150 30 30 15 0.175 15 0.175 15 -40 85 -40 85 -40 85 Min AS4040A-2 Typ Max Min 5.000 0.60 15 AS4040B-2 Typ Max Min 5.000 ±50 ±98 2 0.60 15 50 AS4040C-2 Typ Max ±50 ±98 2 0.60 15 ±50 ±98 2 150 30 30 15 0.175 15 0.175 15 -40 85 -40 85 -40 85 AS4040A-3 Typ Max Min 5.000 °C Units V 0.175 Min µV p-p ppm/°C µSec mA 5.000 100 30 mV mV Ω ±24 ±58 2 1.1 0.175 AS4040B-3 Typ Max Min 5.000 AS4040C-3 Typ Max mV mV Ω µV p-p ppm/°C µSec mA °C Units 5.000 V 0.175 15 0.175 15 0.175 15 mV mV Ω µV p-p ppm/°C µSec mA -40 85 -40 85 -40 85 °C IR=500 µA 0.1KHz≤f ≤10Hz Note 1 0.1% of VOUT Note 2 ±24 ±58 2 0.9 100 IR=500 µA 0.1KHz≤f ≤10Hz Note 1 0.1% of VOUT Note 2 5.000 Units 0.60 15 ±100 ±148 2 0.60 15 50 ±100 ±148 2 0.60 15 100 30 ±100 ±148 2 150 30 30 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. Rev. 10/11/00 AS4040 AS4040 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. AS4040 Fixed Shunt Regulator Application 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) is connected between the supply voltage and the AS4040. 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 AS4040 is less than 15mA VS RS I O + IL IL VR AS4040 VO IQ 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 AS4040 PACKAGE DRAWING 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. 10/11/00 AS4040 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. 10/11/00 AS4040 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. 10/11/00