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AP6508 Dataheets PDF



Part Number AP6508
Manufacturers Diodes
Logo Diodes
Description 500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER
Datasheet AP6508 DatasheetAP6508 Datasheet (PDF)

AP6508 500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER Description The AP6508 is a 500kHz switching frequency internal compensated synchronous DCDC buck converter. It has integrated compensation, and low RDSON high and low side MOSFETs. The AP6508 enables continues load current of up to 3A with efficiency as high as 93%. The AP6508 features current mode control operation, which enables fast transient response times and easy loop stabilization. The AP6508 has external programmable softstart and a .

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AP6508 500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER Description The AP6508 is a 500kHz switching frequency internal compensated synchronous DCDC buck converter. It has integrated compensation, and low RDSON high and low side MOSFETs. The AP6508 enables continues load current of up to 3A with efficiency as high as 93%. The AP6508 features current mode control operation, which enables fast transient response times and easy loop stabilization. The AP6508 has external programmable softstart and a Power Good indicator enabling sequencing and ramp control. The AP6508 simplifies board layout and reduces space requirements with its high level of integration and minimal need for external components, making it ideal for distributed power architectures. The AP6508 is available in a standard Green DFN4030-14 package with exposed PAD for improved thermal performance and is RoHS compliant. Pin Assignments (Top View) IN SW SW SW SW BST EN 1 2 3 4 5 6 7 14 13 12 AGND GND GND VCC SS PG FB Exposed Pad 11 10 9 8 NEW PRODUCT DFN4030-14 Features • • • • • • • VIN 4.5V to 21V VOUT adjustable to 0.8V 500kHz switching frequency Enable pin External Softstart Power Good Protection o OCP o Thermal Shutdown Lead Free Finish/ RoHS Compliant (Note 1) Applications • • • • • • Gaming Consoles TV sets and Monitors Set Top Boxes Distributed power systems Home Audio Consumer electronics http://www.DataSheet4U.net/ • Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit 100 VOUT = 2.5V 90 EFFICIENCY (%) 80 70 60 50 VIN = 12V VIN = 5V 40 0 Typical Application Circuit 3 2 1 LOAD CURRENT (A) Efficiency vs. Load Current AP6508 Document number: DS33437 Rev. 4 - 2 1 of 14 www.diodes.com July 2011 © Diodes Incorporated datasheet pdf - http://www.DataSheet4U.net/ AP6508 500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER Pin Descriptions Pin # 1 2,3,4,5 6 7 Name IN SW BST EN Description Supply Voltage. The AP6508 operates from a 4.5V to 21V input rail. C1 is needed to decouple the input rail. Use wide PCB trace to make the connection. Switch Output. Use wide PCB trace to make the connection. Bootstrap. A capacitor connected between SW and BS pins is required to form a floating supply across the high-side switch driver. EN=1 to enable the chip. For automatic start-up, connect EN pin to VIN by proper EN resistor divider as Figure 1 shows. 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. Power Good External Softstart BIAS Supply. Decouple with 0.μ1F – 0.22μF cap. And the capacitance should be no more than 0.22μF 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. Analog Ground No internal connection. It is recommended to connect exposed pad to GND plane for optimal thermal performance http://www.DataSheet4U.net/ NEW PRODUCT 8 FB 9 10 11 PG SS VCC GND AGND Exposed PAD 12, 13 14 Functional Block Diagram AP6508 Document number: DS33437 Rev. 4 - 2 2 of 14 www.diodes.com July 2011 © Diodes Incorporated datasheet pdf - http://www.DataSheet4U.net/ AP6508 500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER Absolute Maximum Ratings (Note 2) Symbol VIN VSW VBS VFB VEN VCOMP TST TJ TL HBM MM CDM Supply Voltage Switch Node Voltage Bootstrap Voltage Feedback Voltage Enable/UVLO Voltage Comp Voltage Storage Temperature Junction Temperature Lead Temperature Human Body Model Machine Model Charged Device Model Parameter Rating 22 -0.3 to 23 VSW + 6 –0.3V to +6 –0.3V to +6 –0.3V to +6 -65 to +150 +150 +260 4 400 1 Unit V V V V V V °C °C °C kV V kV NEW PRODUCT ESD Susceptibility (Note 3) Thermal Resistance (Note 4) Symbol θJA θJC Junction to Case Parameter Junction to Ambient http://www.DataSheet4U.net/ Rating 48 11 Unit °C/W °C/W Recommended Operating Conditions (Note 5) Symbol VIN TA Notes: Parameter Supply Voltage Operating Ambient Temperature Range Min 4.5 -20 Max 21 +85 Unit V °C 2. Exceeding these ratings may damage the device. 3. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these device. 4. Test condition for DFN4030-14: Measured on approximately 1” square of 1 oz copper. 5. The device function is not guaranteed outside of the recommended operating conditions. AP6508 Document number: DS33437 Rev. 4 - 2 3 of 14 www.diodes.com July 2011 © Diodes Incorporated datasheet pdf - http://www.DataSheet4U.net/ AP6508 500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER Electrical Characteristics (VIN = 12V, TA = +25°C, unless otherwise.


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