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MAX6330_UR-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6330_UR-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page Precision Shunt Regulators with Reset in SOT23-3 _______________________________________________________________________________________ 5 ______________________________________________________________Pin Description PIN FUNCTION 1 1 Ground 2 — Inverting Reset Output. RESET remains low while VSHUNT is below the reset threshold and for 140ms after VSHUNT rises above the threshold. — 2 Noninverting Reset Output. RESET remains high while VSHUNT is below the reset threshold and for 140ms after VSHUNT rises above the threshold. 3 3 Regulated Shunt Voltage (+5V, +3.3V, or +3.0V) NAME GND RESET RESET SHUNT MAX6331 MAX6330 _______________Detailed Description Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. The MAX6330/MAX6331 µP supervisory circuits assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for VSHUNT > 1V. Once VSHUNT exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high. If a brownout condition occurs (VSHUNT dips below the reset threshold), RESET goes low. When VSHUNT falls below the reset threshold, the internal timer resets to zero and RESET goes low. The internal timer starts after VSHUNT returns above the reset threshold, and RESET then remains low for the reset timeout period. The MAX6331 has an active-high RESET output that is the inverse of the MAX6330’s RESET output. Shunt Regulator The shunt regulator consists of a pass device and a controlling circuit, as illustrated in Figure 1. The pass device allows the regulator to sink current while regu- lating the desired output voltage within a ±1.5% toler- ance. The shunt current range (ISHUNT) is 100µA to 50mA. The pass transistor in the MAX6330/MAX6331 main- tains a constant output voltage (VSHUNT) by sinking the necessary amount of shunt current. When ILOAD (see Typical Operating Circuit) is at a maximum, the shunt current is at a minimum, and vice versa: IIN = ISHUNT + ILOAD = (VIN - VSHUNT) / RS Consider the following information when choosing the external resistor RS: 1) The input voltage range, (VIN) 2) The regulated voltage, (VSHUNT) 3) The output current range, (ILOAD) Choose RS as follows: (VIN(max) - VSHUNT (min)) / (50mA + ILOAD(min)) ≤ RS ≤ (VIN(min) - VSHUNT (max)) / (100µA + ILOAD(max)) Choose the largest nominal resistor value for RS that gives the lowest current consumption. Provide a safety margin to incorporate the worst-case tolerance of the MAX6330 MAX6331 VIN RS VSHUNT ILOAD ISHUNT IIN CL SHUNT RESET GENERATOR 140ms TIMEOUT RESET (RESET) 1.2V GND ( ) ARE FOR MAX6331 Figure 1. Functional Diagram |
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