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LM4041BIX3-1.2-T Datenblatt(PDF) 5 Page - Maxim Integrated Products |
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LM4041BIX3-1.2-T Datenblatt(HTML) 5 Page - Maxim Integrated Products |
5 / 7 page Detailed Description The LM4041 shunt references use the bandgap princi- ple to produce a stable, accurate voltage. The device behaves similarly to an ideal zener diode; a fixed volt- age of +1.225V is maintained across its output termi- nals when biased with 60µA to 12mA of reverse current. The LM4041 behaves similarly to a silicon diode when biased with forward currents up 10mA. Figure 3 shows a typical operating circuit. The LM4041 is ideal for providing a stable reference from a high- voltage power supply. Applications Information The LM4041’s internal pass transistor is used to main- tain a constant output voltage (VSHUNT) by sinking the necessary amount of current across a source resistor. The source resistance (RS) is determined from the load current (ILOAD) range, supply voltage (VS) variations, VSHUNT, and desired quiescent current. Choose the value of RS when VS is at a minimum and ILOAD is at a maximum. Maintain a minimum ISHUNT of 60µA at all times. The RS value should be large enough to keep ISHUNT less than 12mA for proper regulation when VS is maximum and ILOAD is at a minimum. To prevent damage to the device, ISHUNT should never exceed 20mA. Therefore, the value of RS is bounded by the following equation: [VS(MIN) - VR ] / [60µA + ILOAD(MAX)] > RS > [VS(MAX) - VR ] / [20mA + ILOAD(MIN)] Choosing a larger resistance minimizes the total power dissipation in the circuit by reducing the shunt current (PD(TOTAL) = VS ✕ ISHUNT). Provide a safety margin to incorporate the worst-case tolerance of the resistor used. Ensure that the resistor’s power rating is ade- quate, using the following general power equation: PR = ISHUNT ✕ (VS(MAX) - VR) Output Capacitance The LM4041 does not require an external capacitor for frequency stability and is stable for any output capaci- tance. Temperature Performance The LM4041 typically exhibits an output voltage tem- perature coefficient within ±15ppm/°C. The polarity of the temperature coefficient may be different from one device to another; some may have positive coefficients, and others may have negative coefficients. Improved Precision Micropower Shunt Voltage Reference _______________________________________________________________________________________ 5 Pin Description PIN NAME FUNCTION 1 + Positive Terminal of the Shunt Reference 2 − Negative Terminal of the Shunt Reference 3 N.C. Leave this pin unconnected, or connect to pin 2. Figure 3. Typical Operating Circuit LM4041 ILOAD ISHUNT RS VS VR ISHUNT + ILOAD |
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