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MP20041DGT-MG-LF-Z Datasheet(PDF) 8 Page - Monolithic Power Systems |
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MP20041DGT-MG-LF-Z Datasheet(HTML) 8 Page - Monolithic Power Systems |
8 / 11 page MP20041-DUAL, ULTRA LOW NOISE, HIGH PSRR, 300mA LINEAR REGULATOR MP20041 Rev. 1.0 www.MonolithicPower.com 8 1/17/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. BLOCK DIAGRAM Figure1—Function Block Diagram OPERATION The MP20041 integrates two low noise, low dropout, low quiescent current and high PSRR linear regulators. It is intended for use in devices that require very low voltage, low quiescent current power such as wireless LAN, battery- powered equipment and hand-held equipment. The MP20041 uses internal PMOSs as the pass elements and features internal thermal shutdown and internal current limit circuits. 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 MP20041 is very low. Shutdown The MP20041 can be switched ON or OFF by a logic input at the EN pin. A high voltage at this pin will turn the device on. When the EN pin is low, the regulator output is off. The EN pin should be tied to VIN to keep the regulator output always on if the application does not require the shutdown feature. Do not float the EN pin. Current Limit The MP20041 includes two independent current limit structures which monitor and control each PMOS’s gate voltage limiting the guaranteed maximum output current to 300mA. Thermal Protection Thermal protection turns off the PMOS when the junction temperature exceeds +140ºC, allowing the IC to cool. When the IC’s junction temperature drops by 10ºC, the PMOS will be turned on again. Thermal protection limits total power dissipation in the MP20041. For reliable operation, junction temperature should be limited to 125 ºC maximum. Load-Transient Considerations The output response of load-transient consists of a DC shift and transient response. Because of the excellent load regulation of MP20041, the DC shift is very small. The output voltage transient depends on the output capacitor’s value and the ESR. Increasing the capacitance and decreasing the ESR will improve the transient response. Typical output voltage transient spike of MP20041 for a step change in the load current from 10mA to 100mA is tens mV. |
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