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MAX8892EXK+T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX8892EXK+T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page Thermal-Overload Protection Thermal-overload protection limits total power dissipation in the MAX8891/MAX8892. When the junction tempera- ture exceeds TJ = +160°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the IC’s junction tem- perature drops by 10°C, resulting in a pulsed output dur- ing continuous thermal-overload conditions. Thermal-overload protection is designed to protect the MAX8891/MAX8892 in the event of a fault condition. For continual operation, do not exceed the absolute maxi- mum junction temperature rating of TJ = +150°C. Operating Region and Power Dissipation The MAX8891/MAX8892 maximum power dissipation depends on the thermal resistance of the case and cir- cuit board, the temperature difference between the die junction and ambient, and the rate of airflow. The power dissipation across the device is: P = IOUT (VIN - VOUT) The maximum power dissipation is: PMAX = (TJ - TA)/( θJC + θCA) where TJ - TA is the temperature difference between the MAX8891/MAX8892 die junction and the surrounding air, θJC is the thermal resistance of the package, and θCA is the thermal resistance through the PCB, copper traces, and other materials to the surrounding air. The GND pin of the MAX8891/MAX8892 performs the dual function of providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using a large pad or ground plane. Applications Information Capacitor Selection and Regulator Stability Use a 1µF capacitor on the MAX8891/MAX8892 input and a 1µF capacitor on the output. Larger input capacitor values and lower ESRs provide better noise rejection and line-transient response. Reduce output noise and improve load-transient response, stability, and power- supply rejection by using large output capacitors. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, it may be necessary to use a 2.2µF or larger output capacitor to ensure stability at temperatures below -10°C. With X7R or X5R dielectrics, 1µF is sufficient at all operating temperatures. A graph of the region of stable COUT ESR vs. load current is shown in the Typical Operating Characteristics. PSRR and Transient Response The MAX8891/MAX8892 are designed to deliver high PSRR as well as low dropout and low quiescent currents in battery-powered systems. The MAX8891/MAX8892 power-supply rejection is 65dB at 10kHz. When operating from sources other than batteries, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors, and through passive fil- tering techniques. The Typical Operating Characteristics show the MAX8891/MAX8892 line- and load-transient responses. Dropout Voltage A regulator’s minimum dropout voltage determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX8891/MAX8892 use a p-channel MOSFET pass transistor, their dropout volt- age is a function of drain-to-source on-resistance (RDS(ON)) multiplied by the load current (see the Typical Operating Characteristics). High PSRR, Low-Dropout, 150mA Linear Regulators 6 Maxim Integrated MAX8891/MAX8892 |
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