LM4041

UNISONIC TECHNOLOGIES CO., LTD LM4041 Preliminary LINEAR INTEGRATED CIRCUIT PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE DESCRIPTION As a shunt voltage reference integrated circuit, UTC LM4041 can be used for widespread applications with enhancement of the competitive advantage by saving use of external capacitors.. In order to ensure a stable output voltage, the reference not only offers low dynamic impedance, low noise and a low temperature coefficient, but also provides tight output tolerance (Max 1.0 %) and low temperature coefficient (150ppm/°C). However, for those applications which the output voltage needs to be adjusted between 1.225V and 10V, an external resistor divider is necessary. FEATURES * Output Tolerances and Temperature Coefficient: Max 1.0%, 150 ppm/°C * Low Output Noise : 20μVRMS (Typ.) * Operating Current range : 45μA ~ 12mA * Halogen Free ORDERING INFORMATION Order Number Package LM4041G-xx-AE3-R SOT-23 Note: xx: Output Voltage, refer to Marking Information. Packing Tape Reel www.unisonic.com.tw Copyright © 2009 Unisonic Technologies Co., Ltd 1 of 7 QW-R101-027.a LM4041 PACKAGE Preliminary LINEAR INTEGRATED CIRCUIT MARKING INFORMATION VOLTAGE CODE MARKING 3 SOT-23 AD: ADJ Voltage Code N4XXG 2 1 PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 PIN NAME Cathode FB Anode DESCRIPTION Output reference voltage, cathode terminal Feedback terminal Output reference voltage, anode terminal UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R101-027.a LM4041 BLOCK DIAGRAM Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 7 QW-R101-027.a LM4041 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (Ta = 25°C, unless otherwise specified.) PARAMETER SYMBOL RATINGS UNIT Continuous Cathode Voltage VZ 15 V Continuous Cathode Current IZ -10~+25 mA Junction Temperature TJ 150 °C Storage Temperature TSTG -65~+150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 206 °C/W Note: Maximum power dissipation is a function of TJ(max), θJA, and Ta. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/ θJA. Operating at the absolute maximum TJ of 150°C can affect reliability. RECOMMENDED OPERATING CONDITIONS PARAMETER Cathode Current (max) Reverse Breakdown Voltage Operating Temperature SYMBOL IZ VZ Ta RATINGS 12 10 -40~+85 UNIT mA V °C ELECTRICAL CHARACTERISTICS (Ta =-40°C~ +85°C, unless otherwise specified.) PARAMETER Reference Voltage Reference Voltage Tolerance (Note) Reference Voltage Change With Cathode Current Change Reference Voltage Change With Output Voltage Change Minimum Cathode Current Feedback Current Temperature Coefficient of Output Voltage (Note) SYMBOL TEST CONDITIONS MIN TYP MAX UNIT VREF VZ=5V, IZ = 100μA, Ta=25°C 1.233 V Ta=25°C -12 12 mV VZ=5V, IZ = 100μA Ta =-40°C~+85°C -24 24 mV Ta=25°C 0.7 2 mV IZ(MIN) < IZ < 1mA ΔVREF Ta=-40°C~+85°C 2.5 mV ΔIZ Ta=25°C 2 6 mV 1mA < IZ < 12mA Ta=-40°C~+85°C 8 mV ΔVREF Ta=25°C -1.55 -2 mV/V IZ=1mA ΔVKA Ta=-40°C~+85°C -3 mV/V Ta=25°C 45 75 μA IZ(MIN) Ta =-40°C~+85°C 80 μA Ta=25°C 60 150 nA IFB Ta=-40°C~+85°C 200 nA VZ=5V, IZ =10mA, Ta=25°C ±20 ppm/°C Ta=25°C ±15 ppm/°C TCVO VZ=5V, IZ=1mA Ta=-40°C~+85°C ±150 ppm/°C VZ=5V, IZ=100μA, Ta=25°C ±15 ppm/°C VZ=VREF, IZ=1mA, IAC=0.1IZ 0.3 Ω f=120Hz, Ta=25°C ZZ VZ=10V, IZ=1mA, IAC=0.1IZ 2 Ω f=120Hz, Ta=25°C VZ=VREF, IZ =100μA 20 μVrms eN 10Hz ≤ f ≤ 10 kHz, Ta=25°C ppm Reverse Dynamic Impedance Output Voltage Noise Long-term Stability of Reverse t=1000h, IZ=100μA, Ta = 25°C±0.1°C, 120 Breakdown Voltage Note: Reference voltage tolerance and average temperature coefficient change with output voltage (VZ). UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 7 QW-R101-027.a LM4041 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT IR (+) (-) v 2V/step LM4041 (Adj) Reverse Characteristics Test Circuit Output Capacitor Across CATHODE and ANODE, there’s no need to use output capacitor for the UTC LM4041 stability operation. Pin Connections There is a parasitic Schottky diode connected between Cathode (pin 1) and Anode (pin 3) .Thus, pin 3 must be left floating or connected to pin 1. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 7 QW-R101-027.a LM4041 Preliminary LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION VZ is set according to the equation shown as below which can be set by a user-defined resistor divider. VS RS VZ = VREF 1+ VREF LM4041 R2 R1 R2 R1 Adjustable Shunt Regulator Cathode and Load Currents The total current available to supply the load (IL) and bias the UTC LM4041 (IZ) is set by RS, so its value must be set properly. In all cases, IZ must stay in a specified range for proper operation of the reference; RS must be small enough to supply the minimum IZ. At maximum VS and minimum IL, to limit IZ to not exceed rating of 12 mA, RS must be large enough. RS= (VS − VZ ) (IL + I Z ) VS IZ + IL RS VZ IZ LM4041 IL Shunt Regulator UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 7 QW-R101-027.a LM4041 Preliminary LINEAR INTEGRATED CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 7 QW-R101-027.a