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MP20051DN Datasheet(PDF) 9 Page - Monolithic Power Systems |
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MP20051DN Datasheet(HTML) 9 Page - Monolithic Power Systems |
9 / 12 page MP20051 – LOW NOISE HIGH PSRR 1A LINEAR REGULATOR MP20051 Rev.1.11 www.MonolithicPower.com 9 12/26/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. OPERATION The MP20051 is a low-dropout linear regulator that can supply up to 1A current, which makes it suitable for very low voltage, low quiescent, low noise, and high PSRR applications such as wireless LAN transceivers, notebook computers, smartphones, and other low-power electronics. The MP20051 uses an internal PMOS as the pass element and includes both thermal shutdown and an internal current-limiting circuit. Dropout Voltage Dropout voltage is the minimum input to output differential voltage required for the regulator to maintain an output voltage within 100mV of its nominal value. Because the PMOS pass element behaves as a low-value resistor, the dropout voltage of MP20051 is only 140mV. Shutdown The MP20051 can be switched ON or OFF by a logic input at the EN pin: Logic high turns the regulator on and logic low turns it off. Tie the EN pin to VIN if the application does not require the shutdown feature. Do not float the EN pin. Current Limit The MP20051 includes a current limit structure that monitors and controls the PMOS gate voltage to limit the guaranteed maximum output current to 1.6A. Thermal Protection Thermal protection turns off the PMOS when the junction temperature exceeds 150°C, allowing the IC to cool. When the IC’s junction temperature drops by 20°C, the PMOS will turn on again. Thermal protection limits total power dissipation in the MP20051. For reliable operation, limit the junction temperature to a maximum of 125°C. Load-Transient Considerations The output response of the load-transient consists of a transient response and DC shift— the MP20051’s excellent load regulation effectively limits the DC shift. The output voltage transient depends on the output capacitor’s value and ESR. Increasing the capacitance and decreasing the ESR will improve the transient response. |
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