SPX2431AM-L

SPX2431 Precision Adjustable Shunt Regulator Description 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 lines and contribute a significant cost savings. The output voltage may be adjusted to any value between VREF 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 a SOT-23-3 package. FEATURES ■■ Trimmed bandgap to 0.5% and 1.0% ■■ Wide operating current 1mA to 100mA ■■ Extended temperature 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 APPLICATIONS ■■ Battery operating equipment ■■ Adjustable supplies ■■ Switching power supplies ■■ Error amplifiers ■■ Single supply amplifier ■■ Monitors / VCRs / TVs ■■ Personal computers Ordering Information - Back Page Functional Block Diagram Cathode (K) Reference (R) + 2.5V Anode (A) Lorem ipsum REV 1A 1/9 SPX2431 Absolute Maximum Ratings Recommended Conditions 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 conditions for extended periods may affect reliability. Cathode Voltage VKA........................................VREF to 20V Cathode-Anode Reverse Breakdown VKA...................... 20V ѲJC............................................... 150˚C/W Anode-Cathode Forward Current, (< 10ms) IAK............... 1A Operating Cathode Current IKA................................. 100mA Typical deratings of the thermal resistances are given for ambient temperature >25˚C. Cathode Current IK...................................................... 10mA Typical Thermal Resistances SOT-23 ѲJA............................................... 575˚C/W Typical Derating.......................... 1.7mW/˚C Reference Input Current IREF..................................... 1.0mA Continuous Power Dissipation at 25°C PD SOT-23........................................... 200mW Junction Temperature TJ.............................................150˚C Storage Temperature TSTG...........................-65˚C to 150˚C Electrical Characteristics Electrical characteristics at 25°C, IK = 10mA, VK = VREF, unless otherwise specified. PARAMETERS SYMBOL FIGURE CONDITIONS MIN. TYP. MAX. MIN. 2.513 2.474 2.520 2.460 SPX2431A Reference voltage VREF ∆VREF with temp. TC Ratio of change in VREF to cathode voltage 2 2 2.487 TJ = 0°C to 105°C 2.480 2 ∆VREF 2.500 0.07 -1.01 UNITS 10V to 20V -2.0 -0.4 0.3 0.7 2.500 2.526 2.540 0.07 0.20 V mV/°C -2.7 -1.01 -2.0 -0.4 0.3 4.0 0.7 4.0 0.4 1.2 0.4 1.2 μA 0.4 1.0 0.4 1.0 mA 0.04 500 nA 0.15 0.5 Ω 3 IREF 3 IREF temp deviation ∆IREF 3 Min IK for regulation IK(MIN) 2 Off state leakage IK(OFF) 4 VREF = 0V, VKA = 20V 0.04 ZKA 2 fZ ≤ 1kHz IK = 1 to 100mA 0.15 Dynamic output impedance 0.20 -2.7 TJ = 0°C to 105°C MAX. SPX2431 VREF to 10V ∆VK Reference input current TYP. 0.5 mV/V μA Pin Configuration SOT-23-3 (M) ANODE 3 1 2 REF CATHODE Top View REV 1A 2/9 SPX2431 Calculating Average Temperature Coefficient (TC) ppm 0 % 0 mV 0 · ∆ V REF (mV) ∆ TA TC in mV / °C = ∆ V REF ∆T · -5 5000 TC in % / °C = ( 15 30 45 60 75 90 · 105 TC in ppm / °C = x 100 ∆ TA 0.5 0 ) ∆ V REF ∆ V REF at 25°C ( ) ∆ V REF ∆ V REF at 25°C x 10 6 ∆ TA Junction Temperature (°C) 0.0033mV/°C 0.0027% /°C 27ppm/°C Figure 1: VREF vs. Temperature Test Circuits V IN V KA = V REF V IN V KA V IN V KA I K (OFF) I REF IK R1 I REF IK (V REF) R2 Figure 2: Test Circuit for VKA = VREF Figure 3: Test Circuit for VKA > VREF REV 1A Figure 4: Test Circuit for IKOFF 3/9 SPX2431 Typical Performance Characteristics 2.53 150 125 V REF Reference Voltage (V) I K Cathode Current (mA) 100 75 50 25 0 -25 -50 2.51 2.50 2.49 2.48 2.47 2.46 -75 -100 -2 -1 0 1 V KA Cathode Voltage (V) 2 2.45 -60 3 -30 0 30 60 90 120 TA Ambient Temperature (°C) Figure 5: High Current Operating Characteristics Figure 6: Reference Voltage vs. Ambient Temperature 900 I REF Reference Input Current (µA) 3.0 800 V KA = VREF 0° to 105°C 700 I K Cathode Current (µA) V KA = VREF I K = 10mA 2.52 V KA = VREF 0°C to 105°C 600 500 400 105°C 300 25°C 200 -0°C 100 0 R1 = 10kΩ R2 = ∞ I K = 10mA 2.5 2.0 1.5 1.0 0.5 -100 -200 -1.0 0 1.0 2.0 V KA Cathode Voltage (V) 0 -60 3.0 Figure 7: Low Current Operating Characteristics Noise Voltage nV/ √ Hz 70 -10 0°C ∆ V REF (mV) 120 Figure 8: Reference Input Current vs. Ambient Temperature 0 -20 25°C 75°C -30 125°C I KA = 10mA 60 50 40 30 20 -40 10 -50 0 -30 0 30 60 90 TA Ambient Temperature (°C) 3 6 9 12 15 18 21 24 0 10 27 30 V KA Cathode Voltage (V) V KA = VREF I K = 10mA TA = 25°C 100 1K 10K 100K f Frequency (Hz) Figure 9: Reference Voltage Line Regulation vs. Cathode Voltage and TAMBIENT Figure 10: Noise Voltage vs. Frequency REV 1A 4/9 SPX2431 Typical Performance Characteristics (continued) ZKA Dynamic Impedance (Ω) /DIV 10.000dB 45.000deg REF LEVEL 60.000dB 0.0deg 0.150 V KA = VREF I K = 1 to 100mA f≤ 1kHz 0.125 MARKER 25 297 698.000 Hz MAG (A/R) -0.025 dB MARKER 25 297 698.000 Hz PHASE (A/R) 93.320 deg 60dB 215° 180° 50dB PHASE 0.100 0.075 40dB 135° 30dB 90° 20dB 45° 0° 10dB 0.050 0.025 0.0 -60 -30 0 30 60 90 TA Free Air Temperature GAIN 0dB -45° -10dB -90° -20dB -135° -30dB -180° -40dB 10 120 100 1K 10K 100K START 10.000Hz Figure 11: Low Frequency Dynamic Output Impedance vs. TAMBIENT 1M -215° 10M STOP 50 000 000.000Hz Figure 12. Small Signal Gain and Phase vs. Frequency; IK = 10mA, TA = 25˚C V OUT 9µF 15kΩ V IN 230Ω IK V OUT V IN 8.25kΩ GND Figure 13. Test Circuit for Gain and Phase Frequency Response Figure 14. Frequency = 100kHz, IK = 10mA, TA = 25˚C 100 90 V IN 80 I K Cathode Current (mA) 250Ω V OUT IK f p = 100kHz 50Ω A: V KA = VREF B: VKA = 5V at IK =10mA C: VKA =10V at IK =10mA D: VKA =15V at IK =10mA 70 60 50 40 STABLE STABLE 20 0 100 Figure 15. Test Circuit for Pulse Response A 30 10 GND C TA = 25°C B D 101 102 103 104 105 CL Load Capacitance (pF) 106 107 Figure 16. Stability Boundry Conditions REV 1A 5/9 SPX2431 Typical Performance Characteristics (continued) ZKA Dynamic Impedance (Ω) 100 150Ω IK R CL 10kΩ TA = 25°C I K = 1 to 100mA 10 1.0 0.1 0.01 1K Figure 17: Test Circuit for Stability 100K 1M f Frequency (Hz) 10M Figure 18: Dynamic Output Impedance TA = 25˚C, IK = 1 to 100mA V IN 100 I K OFF Cathode Current (nA) 10K R3 V OUT 10 R1 0.1% V KA = 20V V REF = 0V 1 V REF SPX2431 0.1 R2 0.1% 0.01 -50 0 50 100 150 TA Ambient Temperature (°C) Figure 19: Off State Leakage Figure 20: Shunt Regulator VOUT = (1+R1/R2)VREF V IN V OUT I SINK R2 R3 Q1 R1 0.1% Opto Isolator R3 sets feedback gain, C1 provides feedback compensation Isolated Feedback SPX2431 C2 R1 0.1% C1 + SPX2431 R2 0.1% V OUTRTN Figure 21: Constant Current, Sink, ISINK = VREF/R1 Figure 22: Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters REV 1A 6/9 SPX2431 Typical Performance Characteristics (continued) V IN V IN R5 R1 0.1% R4 C1 V OUT R1 0.1% R2 0.1% R3 V OUT SPX2431 R3 Q1 SPX2431 R2 0.1% Figure 23: Precision High Current Series Regulator VOUT = (1+R1/R2)VREF Figure 24: High Current Shunt Regulator VOUT = (1+R1/R2)VREF V CC R2 V IN R1 V OUT * Resistor values are chosen such that the effect to IREF is negligible. SPX2431 Figure 25: Single Supply Comparator with Temperature Compensated Threshold. VIN Threshold = 2.5V REV 1A 7/9 SPX2431 Mechanical Dimensions SOT-23-3 REV 1A 8/9 SPX2431 Ordering Information(1) Part Number Operating Temperature Range Lead-Free Package Packaging Method 0°C to 105°C Yes(2) 3-pin SOT-23 Tape and Reel SPX2431AM-L/TR SPX2431M-L/TR Accuracy 0.5% 1.0% Output Voltage 2.5V NOTE: 1. Refer to www.exar.com/SPX2431 for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. Revision History Revision Date 1A 11/17/2017 Corporate Headquarters: 5966 La Place Court Suite 100 Carlsbad, CA 92008 Tel.:+1 (760) 692-0711 Fax: +1 (760) 444-8598 www.maxlinear.com Description Added MaxLinear logo. Updated format and ordering information table from previous revision dated 1/19/05. Pinout moved to page 2. Corrected typo for E min in mechanical dimensions. High Performance Analog: 1060 Rincon Circle San Jose, CA 95131 Tel.: +1 (669) 265-6100 Fax: +1 (669) 265-6101 Email: powertechsupport@exar.com www.exar.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced into, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of MaxLinear, Inc. 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Company and product names may be registered trademarks or trademarks of the respective owners with which they are associated. © 2017 MaxLinear, Inc. All rights reserved SPX2431_DS_111717 REV 1A 9/9