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MP1492DS-A Datasheet(PDF) 4 Page - Monolithic Power Systems |
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MP1492DS-A Datasheet(HTML) 4 Page - Monolithic Power Systems |
4 / 18 page MP1492 – 2A, 4.2V-16V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER MP1492 Rev. 1.1 www.MonolithicPower.com 4 3/13/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. PIN FUNCTIONS SOIC8 Pin # Name Description 1 IN Supply Voltage. The MP1492 operates from a +4.2V to +16V input rail. C1 is needed to decouple the input rail. Use wide PCB traces and multiple vias to make the connection. 2 GND System Ground. This pin is the reference ground of the regulated output voltage. For this reason care must be taken in PCB layout. 3 SW Switch Output. Use wide PCB traces and multiple vias to make the connection. 4 BST Bootstrap. A capacitor connected between SW and BST pins is required to form a floating supply across the high-side switch driver. 5 BYP Internal LDO output. Decouple with a 1µF ceramic capacitor. X7R or X5R grade dielectric ceramic capacitors are recommended for their stable temperature characteristics. 6 EN EN=1 to enable the MP1492. For automatic start-up, connect EN pin to VIN with a pull-up resistor. 7 FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin, sets the output voltage. 8 FREQ Frequency. Setting Pin. Sets the full-load switching frequency driving CCM operation.. Connect a resistor R7 to IN to set the switching frequency. An optional 1nF decoupling capacitor can be added to improve any switching frequency jitter that may be present. |
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