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MAX8866TEUA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX8866TEUA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page Dual, Low-Dropout, 100mA Linear Regulators 10 ______________________________________________________________________________________ Reverse Battery Protection The MAX8865/MAX8866 have a unique protection scheme that limits the reverse supply current to less than 1mA when either VIN or V SHDN__ falls below ground. The circuitry monitors the polarity of these pins, disconnecting the internal circuitry and parasitic diodes when the battery is reversed. This feature pre- vents the device from overheating and damaging the battery. __________Applications Information Capacitor Selection and Regulator Stability Normally, use two 1µF surface-mount ceramic capaci- tors on the input and a 1µF surface-mount ceramic capacitor on each output of the MAX8865/MAX8866. Larger input capacitor values and lower ESR provide better supply-noise rejection and transient response. A higher-value input capacitor (10µF) may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. Improve load-transient response, stability, and power-supply rejection by using large output capacitors. For stable operation over the full temperature range, with load cur- rents of 100mA, a minimum of 1µF is recommended (see the Region of Stable COUT ESR vs. Load Current graph in the Typical Operating Characteristics). Noise The MAX8865/MAX8866 exhibit 350µVRMS noise during normal operation. When using the MAX8865/MAX8866 in applications that include analog-to-digital converters of greater than 12 bits, consider the ADC’s power-sup- ply rejection specifications (see the Output Noise DC to 1MHz photo in the Typical Operating Characteristics). Power-Supply Rejection and Operation from Sources Other than Batteries The MAX8865/MAX8866 are designed to deliver low dropout voltages and low quiescent currents in battery- powered systems. Power-supply rejection is 60dB at low frequencies and rolls off above 400Hz. As the frequency increases above 100kHz, the output capacitor is the major contributor to the rejection of power-supply noise (see the Power-Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics. When operating from sources other than batteries, improve supply-noise rejection and transient response by increasing the values of the input and output capac- itors, and using passive filtering techniques (see the supply and load-transient responses in the Typical Operating Characteristics). Load-Transient Considerations The MAX8865/MAX8866 load-transient response graphs (see Typical Operating Characteristics) show two components of the output response: a DC shift of the output voltage due to the different load currents, and the transient response. Typical overshoot for step changes in the load current from 0mA to 50mA is 12mV. Increasing the output capacitor’s value and decreasing its ESR attenuates transient spikes. Cross-Regulation Cross-regulation refers to the change in one output voltage when the load changes on the other output. For the MAX8865/MAX8866, cross-regulation for a 0mA to 50mA load change on one side results in less than 1mV change of output voltage. If the power dissipation on one output causes the junction temperature to exceed 125°C, ensure regulation of the other output with a mini- mum load current of 100µA. Input-Output (Dropout) Voltage A regulator’s minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply volt- age. In battery-powered systems, this will determine the useful end-of-life battery voltage. Because the MAX8865/MAX8866 use P-channel MOSFET pass transis- tors, their dropout voltages are a function of RDS(ON) multi- plied by the load currents (see Electrical Characteristics). ___________________Chip Information TRANSISTOR COUNT: 259 |
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