ME431BXG

ME431 Adjustable Precision Shunt Regulator General Description Features The ME431 series ICs are three-terminal adjustable ●Programmable Precise Output Voltage from 2.5V shunt regulators with guaranteed thermal stability over a to 36V full operation range. These ICs feature sharp turn-on ●Very Accurate Reference Voltage: Typical 0.15% characteristics, low temperature coefficient and low ●High Stability under Capacitive Load output impedance, which make them ideal substitutes for ●Low Temperature Deviation: Typical 4.5mV Zener diodes in applications such as switching power ● Low Equivalent Full-range Temperature supply, charger and other adjustable regulators. The ME431 voltage type is 40V. The output voltage Coefficient with 20PPM/℃ Typical ●Low Dynamic Output Resistance: Typical 0.2Ω can be set to any value between VREF (2.5V) and the ● Sink Current Capacity from 1mA to 100 mA corresponding maximum cathode voltage. ● Low Output Noise Selection Guide The ME431 precision reference is offered in two band gap tolerance: 0.4% and 1.0%. Selection Guide ● Wide Operating Range of -40 to 150℃ ●TO-92, SOT23-3, SOT23 package Typical Application ● Charger ●Voltage Adapter ●Switching Power Supply ●Graphic Card ●Precision Voltage Reference V03 www.microne.com.cn Page 1 of 12 ME431 PIN Configuration TO-92 SOT23 SOT23-3 Block Diagram and symbol CATHODE REF REF ANODE CATHODE VREF ANODE Absolute Maximum Ratings PARAMETER SYMBAL RATING UNIT Cathode voltage VKA 40 V Cathode current range (continuous) IKA -100 to +130 mA Reference input current range IREF 10 mA TO-92 Package: 770 Power Dissipation PD SOT23-3 Package:370 mW SOT23 Package:300 Junction temperature TJ 160 ℃ Storage Temperature range T STG -65~+150 ℃ TO-92 package:150 Package thermal impedance θJA SOT23-3 package:330 ℃/W SOT23 package:350 Note: Use this IC within the stated maximum ratings. Operation beyond these limits may cause degrading or permanent damage to the device. V03 www.microne.com.cn Page 2 of 12 ME431 Recommended Operating Conditions Parameter Symbol Min Max Unit Cathode Voltage VKA VREF 36 V Cathode Current IKA 1.0 100 mA -40 125 ℃ Operating Ambient Temperature Range Electrical Characteristics Parameter Reference 0.4% voltage 1.0% Deviation of reference voltage over-temperature Dynamic impedance Minimum cathode current for regulation Ratio of change in reference voltage to the change in cathode voltage (T A=25℃ ,unless otherwise noted) Symbol Conditions VREF VKA=VREF, IKA=10mA Min Typ. Max 2.490 2.50 2.510 2.475 2.50 2.525 Unit Test circuit V Fig.1 mV Fig.1 VKA=VREF, 0 to 70℃ - 3 10 IKA=10mA -40 to 150℃ - 3 15 | ZKA | VKA=VREF, IKA=1 to 100mA, f≤1.0KHz - 0.15 0.5 Ω Fig.1 IKA (MIN) VKA=VREF - 0.4 1.0 mA Fig.1 ΔVKA =10V to VREF - -0.8 -2.5 ΔVKA =36V to 10V mV/V Fig.2 - ∆VREF ΔVREF ΔVKA IKA=10mA -0.6 -1.5 IREF IKA=10mA, R1=10KΩ, R2=∝ 0.7 3 μA Fig.2 Deviation of reference over full temperature range ∆IREF IKA=10mA, R1=10KΩ, R2=∝,T A=40 to 150℃ 0.1 1.2 μA Fig.2 Off-state cathode current IKA (OFF) VKA=36V, VREF=0 0.03 0.3 μA Fig.3 Reference current Note:The dynamic impedance is defined as: | ZKA | =△VKA/△IKA VIN R1 VKA VIN R3 IKA VKA IKA R1 VIN R1 VREF R2 VREF VK A = VR E F( 1 + R 1 / R 2 )R + E FI Fig.1: for VKA= VREF V03 VKA IOFF Fig.2: for VKA> VREF www.microne.com.cn R1 Fig.3: for IOFF Page 3 of 12 ME431 Typical Performance Characteristics VKA=VREF IKA=10mA R1=10KΩ IKA=10mA VREF =0 VKA=3.5V to 36V VKA=VREF TA=25℃ V03 VKA=36V VKA=VREF TA=25℃ www.microne.com.cn Page 4 of 12 ME431 Small Signal Voltage Gain vs. Frequency Output 15K IKA 242Ω 10μF ME431 8.2K GND Reference Impedance vs. Frequency Output 1K IKA ME431 50Ω GND Stability Boundary Conditions vs. Load Capacitance R1 10K 150Ω IKA R2 V03 www.microne.com.cn Page 5 of 12 ME431 Pulse Response of Input and Output Voltage 220Ω Output Pulse Generator F=100KHz 50Ω GND Typical Application R3 VIN VOUT R1 VO=(1+R1/R2)VREF VREF ME431 R2 Fig.4: Shunt Regulator VIN VOUT R1 R4 R2 VREF VO=(1+R2/R3)VREF ME431 R3 Fig.5: V03 High Current Shunt Regulator www.microne.com.cn Page 6 of 12 ME431 IOUT VIN R2 R1 IOUT=VREF/R2+IKA ME431 Fig.6: Current Source or Current Limit VIN VOUT 5V,1.5A ME1117 R1 8.2K R2 250Ω ME431 R3 250Ω Fig.7: Precision 5V 1.5A Regulator V03 www.microne.com.cn Page 7 of 12 ME431 Packaging Type: TO-92 V03 Min Max Min Max A 3.4 3.8 0.13386 0.1496 B 0.3 0.5 0.0118 0.0197 C 4.4 4.8 0.1732 0.189 D 4.4 4.8 0.1732 0.189 E 0.9 1.5 0.0354 0.059 e 1.17 1.37 0.046 0.0539 e1 2.39 2.69 0.094 0.1059 L 12 16 0.4724 0.6299 www.microne.com.cn Page 8 of 12 ME431 Packaging Type: TO-92 (Paper Tape) 单位：mm V03 www.microne.com.cn Page 9 of 12 ME431 Packaging Type: SOT23-3 Millimeters Inches DIM V03 Min Max Min Max A 2.7 3.1 0.1063 0.122 B 1.7 2.1 0.0669 0.0827 b 0.35 0.5 0.0138 0.0197 C 1.0 1.2 0.0394 0.0472 c 0.1 0.25 0.0039 0.0098 d 0.2 - 0.0079 - E 2.6 3.0 0.1023 0.1181 e 1.5 1.8 0.059 0.0708 www.microne.com.cn Page 10 of 12 ME431 Packaging Type: SOT23 Millimeters Inches DIM V03 Min Max Min Max A 2.7 3.1 0.1063 0.122 B 1.7 2.1 0.0669 0.0827 b 0.35 0.5 0.0138 0.0197 C 1.0 1.2 0.0394 0.0472 c 0.1 0.25 0.0039 0.0098 d 0.2 - 0.0079 - E 2.1 2.64 0.0827 0.1039 e 1.2 1.4 0.0472 0.0551 www.microne.com.cn Page 11 of 12 ME431   The information described herein is subject to change without notice. Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design.   Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Nanjing Micro One Electronics Inc is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro One Electronics Inc.  Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. V03 www.microne.com.cn Page 12 of 12