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MP20041 Datasheet(PDF) 9 Page - Monolithic Power Systems |
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MP20041 Datasheet(HTML) 9 Page - Monolithic Power Systems |
9 / 11 page MP20041-DUAL, ULTRA LOW NOISE, HIGH PSRR, 300mA LINEAR REGULATOR MP20041 Rev. 1.0 www.MonolithicPower.com 9 1/17/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. APPLICATION INFORMATION Power Dissipation The power dissipation for any package depends on the thermal resistance of the case and circuit board, the temperature difference between the junction and ambient air, and the rate of airflow. The power dissipation across the device can be represented by the equation: P = (VIN - VOUT) ×IOUT The allowable power dissipation can be calculated using the following equation: P(MAX) = (TJunction - TAmbient) / θJA Where (TJunction - TAmbient) is the temperature difference between the junction and the surrounding environment, θJA is the thermal resistance from the junction to the ambient environment. Connect the GND pin of MP20041 to ground using a large pad or ground plane helps to channel heat away. Input Capacitor Selection Using a capacitor whose value is >0.47µF on the MP20041 input and the amount of capacitance can be increased without limit. Larger values will help improve line transient response with the drawback of increased size. Ceramic capacitors are preferred, but tantalum capacitors may also suffice. Output Capacitor Selection The MP20041 is designed specifically to work with very low ESR ceramic output capacitor in space-saving and performance consideration. A ceramic capacitor in the range of 0.47µF and 10µF, and with ESR lower than 1.2Ω is suitable for the MP20041 application circuit. Output capacitor of larger values will help to improve load transient response and reduce noise with the drawback of increased size. 0.1 1 10 100 0 50 100 150 200 250 300 OUTPUT CURRENT(MA) Figure 2—Relationship between ESR and LDO Stability Reverse Current Path The PMOS used in the MP20041 has an inherent diode connected between input and output (see Figure3). If VOUT - VIN is more than a diode-drop, this diode gets forward biased and starts to conduct. To avoid misoperation, an external Schottky connected in parallel with the internal parasitic diode prevents it from being turned on by limiting the voltage drop across it to about 0.3V (see Figure 4). VIN VOUT Figure 3—Inherent Diode Connected between Each Regulator Input and Output Figure 4—External Schottky Diode Connected in Parallel with the Internal Parasitic Diode |
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