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AP6507 Datasheet(PDF) 2 Page - Diodes Incorporated |
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AP6507 Datasheet(HTML) 2 Page - Diodes Incorporated |
2 / 13 page AP6507 500 kHz 18V 3A SYNCHRONOUS DC/DC BUCK CONVERTER AP6507 Document number: DS33435 Rev. 2 - 2 2 of 13 www.diodes.com May 2011 © Diodes Incorporated Pin Descriptions Pin # Name Description 1 IN Supply Voltage. The AP6507 operates from a 4.5V to 18V input rail. C1 is needed to decouple the input rail. Use wide PCB trace to make the connection. 2, 3 SW Switch Output. Use wide PCB trace to make the connection. 4 BST Bootstrap. A capacitor connected between SW and BS pins is required to form a floating supply across the high-side switch driver. 5 EN EN=1 to enable the chip. For automatic start-up, connect EN pin to VIN by proper EN resistor divider as Figure 1 shows. 6 FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin, sets the output voltage. To prevent current limit run away during a short circuit fault condition the frequency fold-back comparator lowers the oscillator frequency when the FB voltage is below 500mV. 7 VCC BIAS Supply. Decouple with 0. μ1F – 0.22μF cap. The capacitance should be no more than 0.22 μF 8 GND Exposed PAD System Ground. This pin is the reference ground for the regulated output voltage. For this reason care must be taken in its PCB layout. Suggested to be connected to GND with copper and vias. Functional Block Diagram |
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