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MAX6329TH Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6329TH Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 11 page Capacitor Selection and Regulator Stability For stable operation over the full temperature range and with load currents up to 150mA, use a 1µF (min) output capacitor. To reduce noise and improve load transient response, stability, and power-supply rejec- tion, use large output capacitor values such as 10µF. Note that some ceramic dielectrics exhibit large capac- itance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use 2.2µF or more to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 1µF should be sufficient at all operating temperatures. A graph of the Region of Stable COUT ESR vs. Load Current is shown in the Typical Operating Characteristics. To improve power-supply rejection and transient response use a 1µF capacitor between IN and GND. Input-Output (Dropout) Voltage A regulator’s minimum input-output voltage differential (or dropout voltage) determines the lowest useable supply voltage. In battery powered systems, this will determine the useful end-of-life battery voltage. Since the MAX6329/MAX6349 use a P-channel MOSFET pass transistor, their dropout voltage is a function of RDS(ON) multiplied by the load current (see Electrical Characteristics). Negative Going OUT Transients These supervisors are relatively immune to short-dura- tion, negative going OUT transients. The Typical Operating Characteristics section shows a graph of the Maximum Transient Duration vs. Reset Threshold Overdrive for which reset is not asserted. The graph was produced using negative going OUT transients starting at OUT and ending below the reset threshold by the magnitude indicated (Reset Threshold Overdrive). The graph shows the maximum pulse width that a negative going OUT transient can typically have without triggering a reset pulse. As the amplitude of the transient increases (i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, an OUT transient that goes only 10mV below the reset threshold and lasts for 75µs will not trigger a reset pulse. 150mA, SOT23, Low Dropout Linear Regulators with Internal Microprocessor Reset Circuit _______________________________________________________________________________________ 9 Chip Information TRANSISTOR COUNT: 800 PROCESS: BiCMOS MAX6329 SET VCC SHDN RESET IN 2.5V TO 5.5V GND GND µP 1 µF RESET OUT Typical Operating Circuit |
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