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Date: 1/19/05 SPX2431 Precision Adjustable Shunt Regulator © Copyrigh t 2005 Sipex Corporation Precision Adjustable Shunt Regulator SPX2431
DESCRIPTION
FEATURES
■ Trimmed Bandgap to 0.5% and 1.0% ■ Wide Operating Current 1mA to 100mA ■ Extended Temp. Range: 0°C to 105°C ■ Low Temperature Coefficient 30 ppm/ °C ■ Offered in 3 Pin SOT-23 (M) ■ Replacement for TL431, AS2431 ■ Low Noise Output The SPX2431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX2431 acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX2431’s thermal stability, wide operating current (100mA) and temperature range (0°C to 105°C) makes it suitable for a variety of applications that require a low cost, high performance solution. SPX2431A tolerance of 0.5% is proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly line and contribute a significant cost savings. The output voltage may be adjusted to any value between V REF and 20 volts with two external resistors. In the standard shunt configuration, the combination of a low temperature coefficient, sharp turn on characteristics, low output impedance, and programmable output voltage makes this precision reference an excellent error amplifier. The SPX2431 is available in SOT -23-3 package.
APPLICATIONS
■ Battery Operating Equipment ■ Adjustable Supplies ■ Switching Power Supplies FUNCTIONAL DIAGRAM 2.5V Reference (R) Anode (A) Cathode (K) Now Available in Lead Free Packaging ■ Error Amplifiers ■ Single Supply Amplifier ■ Monitors / VCRs / TVs ■ Personal Computers SPX2431
3 Pin SOT-23
Date: 1/19/05 SPX2431 Precision Adjustable Shunt Regulator © Copyright 200 5 Sipex Corporation Continuos Power Dissipation at 25°C PD NOTE: 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 condi- tions for extended periods may affect reliability. TYPICAL THERMAL RESISTANCES PACKAGE 0JA 0JC TYPICAL DERATING SOT-23 575 °C/W 150 °C/W 1.7 mW/ °C Typical deratings of the thermal resistances are given for ambient temperature >25 °.
ELECTRICAL CHARACTERISTICS
Electrical characteristics at 25 °C IK = 10mA VK = VREF, unless otherwise specified. PARAMETER SYMBOL FIGURE CONDITIONS MIN TYP MAX MIN TYP MAX UNITS SPX2431A SPX2431 2T J = 0°C to 105°C 2.480 2.520 2.460 2.540 V Ratio of Change in V REF ∆ VREF VREF to 10V -2.7 -1.01 -2.7 -1.01 mV/V Reference Input Current I REF 3 0.7 4.0 0.7 4.0 µA IREF Temp Deviation ∆IREF 3T J = 0°C to 105°C 0.4 1.2 0.4 1.2 µA Min IK for Regulation I K(MIN) 2 0.4 1.0 0.4 1.0 mA Off State Leakage I K(OFF) VREF = 0V, 0.04 0.04 500 nA
4 V KA = 20V
Dynamic Output Z KA 2ƒ z ≤ 1kHz 0.15 0.5 0.15 0.5 Ω Impedance I K = 1 to 100mA RECOMMENDED CONDITIONS PARAMETER SYMBOL RATING UNIT Cathode Voltage V KA VREF to 20 V Cathode Current I K 10 mA ABSOLUTE MAXIMUM RATINGS
Date: 1/19/05 SPX2431 Precision Adjustable Shunt Regulator © Copyright 200 5 Sipex Corporation PACKAGES: 3 PIN SOT-23 A A2 A1 SIDE VIEW A A Seating Plane C c WITH PLATING BASE METAL b EE1 e D b 1 2 L Gauge Plane VIEW C SEE VIEW C B B SECTION B-B VIEW A-A Seating Plane Ø SYMBOL MIN NOM MAX A 0.89 - 1.12 A1 0.01 - 0.1 A2 0.88 0.95 1.02 b 0.3 - 0.5 c 0.08 - 0.2 D 2.8 2.9 3.04 e E 0.95 - 2.64 E1 1.2 1.3 1.4 L 0.4 0.5 0.6 ø0 º - 8 º Note: Dimensions in (mm)
3 Pin SOT-23 JEDEC TO-236 (AB) Variation
0.95 BSC
1.90 BSC
0.54 REF
Date: 1/19/05 SPX2431 Precision Adjustable Shunt Regulator © Copyrigh t 2005 Sipex Corporation Corporation ANALOG EXCELLENCE Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. Sipex Corporation Headquarters and Sales Office
22 Linnell Circle
Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com PART NUMBER ACC OUTPUT VOLTAGE PACKAGES
ORDERING INFORMATION
/TR = Tape and Reel Pack quantity is 2,500 for SOT-23. Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX2431AM/TR = standard; SPX2431AM-L/TR = lead free CLICK HERE TO ORDER SAMPLES