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MAX6138C Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX6138C Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 13 page 0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages ______________________________________________________________________________________ 11 Detailed Description The MAX6138 shunt reference uses the bandgap prin- ciple to produce a stable, accurate voltage. The device behaves similarly to an ideal zener diode; a fixed volt- age is maintained across its output terminals when biased with 60µA to 15mA of reverse current. The MAX6138 behaves similarly to a silicon diode when biased with forward currents up to 10mA. Figure 3 shows a typical operating circuit. The MAX6138 is ideal for providing a stable reference from a high-voltage power supply. Applications Information The MAX6138’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 15mA 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 X 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: PDR = ISHUNT ✕ (VS(MAX) - VSHUNT) Output Capacitance The MAX6138 does not require an external capacitor for operational stability and is stable for any output capacitance. Temperature Performance The MAX6138 typically exhibits an output voltage tem- perature coefficient within ±4ppm/°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. Chip Information TRANSISTOR COUNT: 70 PROCESS: BiCMOS Pin Description PIN NAME FUNCTION 1 + Positive Terminal of the Shunt Reference 2 - Negative Terminal of the Shunt Reference 3 N.C. No Connection. Leave this pin unconnected or connect to Pin 2. MAX6138 ILOAD ISHUNT RS VS VR ISHUNT + ILOAD Figure 3. Typical Operating Circuit |
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