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MP1497S Datasheet(PDF) 7 Page - Monolithic Power Systems |
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MP1497S Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 15 page MP1497S – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS MP1497S Rev. 1.01 www.MonolithicPower.com 7 9/7/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. PIN FUNCTIONS Package Pin # Name Description 1 SS Soft-Start. Connect an external capacitor to program the soft start time for the switch-mode regulator. 2 IN Supply Voltage. The MP1497S operates from a 4.5V-to-16V input rail. Use C1 to decouple the input rail. Connect using a wide PCB trace. 3 SW Switch Output. Connect using a wide PCB trace. 4 GND System Ground. The regulated output voltage reference ground. Connect to GND with copper and vias. 5 BST Bootstrap. Connect a capacitor between SW and BST pins to form a floating supply across the high-side switch driver. A 10Ω resistor placed between SW and BST cap is strongly recommended to reduce SW spike voltage. 6 EN/SYNC Enable/Synchronize. EN high to enable the MP1497S. Apply an external clock to change the switching frequency. 7 VCC Bias Supply. Decouple with a 0.1μF-to-0.22μF capacitor. Avoid a capacitance that exceeds 0.22μF. VCC capacitor should be put closely to VCC pin and GND pin. 8 FB Feedback. Connect to the tap of an external resistor divider from the output to GND to set the output voltage. The comparator lowers the oscillator frequency when the FB voltage drops below 400mV to prevent current-limit run-away during a short-circuit fault. |
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