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MP1494S Folha de dados(PDF) 8 Page - Monolithic Power Systems |
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MP1494S Folha de dados(HTML) 8 Page - Monolithic Power Systems |
8 / 17 page MP1494S – SYNCHRONOUS STEP-DOWN CONVERTER MP1494S Rev. 1.0 www.MonolithicPower.com 8 12/13/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. PIN FUNCTIONS Package Pin # Name Description 1 AAM Advanced Asynchronous Modulation. Connect the tap of 2 resistor dividers to force the MP1494S into non-synchronous mode under light loads. Drive AAM pin high (VCC) to force the MP1494S into CCM. 2 IN Supply Voltage. The MP1494S operates from a 4.5V to 16V input rail. Requires 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. This pin is the reference ground of the regulated output voltage, and PCB layout requires special care. For best results, connect to GND with copper traces and vias. 5 BST Bootstrap. Requires a capacitor connected between SW and BST pins to form a floating supply across the high-side switch driver. A 10 Ω 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 MP1494S. Apply an external clock to the EN pin to change the switching frequency. 7 VCC Bias Supply. Decouple with 0.1 μF-to-0.22μF capacitor. Select a capacitor that does not exceed 0.22 μF. 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 frequency fold-back comparator lowers the oscillator frequency when the FB voltage is below 400mV to prevent current limit runaway during a short-circuit fault condition. |
Nº de peça semelhante - MP1494S |
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Descrição semelhante - MP1494S |
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