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MP8801DJ-2.85 Datasheet(PDF) 4 Page - Monolithic Power Systems |
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MP8801DJ-2.85 Datasheet(HTML) 4 Page - Monolithic Power Systems |
4 / 7 page MP8801 – LOW DROPOUT, 150mA LINEAR REGULATOR MP8801 Rev. 1.6 www.MonolithicPower.com 4 3/6/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 IN Power Source Input. IN supplies the internal power to the MP8801 and is the source of the pass transistor. Bypass IN to GND with a 1µF or greater capacitor. 2 GND Ground. 3 EN Enable Input. Drive EN high to turn on the MP8801; low to turn it off. For automatic startup, connect EN to IN. 4 FB Feedback Input. Connect a resistive voltage divider from OUT to FB to set the output voltage. The OUT feedback threshold is 1.222V. 5 OUT Regulator Output. OUT is the output of the linear regulator. Bypass OUT to GND with a 1µF or greater capacitor. OPERATION The MP8801 is a low-current, low-noise, high-PSRR, low-dropout linear regulator. It is intended for use in devices that require very low noise power supplies and high-PSRR such as PLL VCO supplies for mobile handsets and 802.11 PC Cards, as well as audio codecs and microphones. The MP8801 uses a PMOS pass element and features internal thermal shutdown. The normally fixed output MP8801 may be converted to an adjustable output device by applying a resistor divider network as shown in Figure 2. An optional feed-forward capacitor, CBYP, may be added for an improved transient response. MP8801_F01_BD01 VIN VEN C3 GND FB OUT VOUT -- + BANDGAP REFERENCE INTERNAL RESISTOR DIVIDER CBYP Figure 1—Ultra-Low-Noise Fixed Output Regulator MP8801_F02_BD02 VIN VEN COUT CBYP R1 R2 VOUT -- + BANDGAP REFERENCE GND FB OUT EXTERNAL RESISTOR DIVIDER Figure 2—Ultra-Low-Noise Adjustable Regulator: VOUT = VFB(1+(R1/R2)) |
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