PDF FAN8060 Data sheet ( Hoja de datos )

Número de pieza	FAN8060
Descripción	1A Synchronous Step-Down DC/DC Converter
Fabricantes	Fairchild Semiconductor
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No Preview Available ! November 2013 FAN8060 1.2 MHz, 1 A Synchronous Step-Down DC/DC Regulator Features  Current Mode Control  Over 96% Efficient  Selectable Continuous Output Current: 500 mA/1 A  2.5 V to 5.5 V Input Voltage Range  Output Voltage as Low as 1.2 V  1.2 MHz Operating Frequency  Less than 1 µA Shutdown Current  External Synchronization from 500 kHz to 2 MHz  100% Duty Cycle  Synchronous Switching FET; no Schottky Diode Required  Stable with Ceramic Capacitors  Light Load Mode with Pulse Skipping  External Compensation  External Soft-Start  Overload / Short-Circuit Protection  Under-Voltage Lockout  Thermal Shutdown  10-Lead 3x3 mm Green MLP Package Applications  PDAs  GPS Devices  MP3 Players  Mini PCI  Digital Cameras  Peripheral Ports  DSP Core  USB Devices  PCMCIA  Cable Modem  Data Cards Description The FAN8060 is a highly efficient, monolithic, current- mode, step-down synchronous regulator. It can provide 1 A continuous current from 2.5 V to 5.5 V input voltage. The output voltage can be adjusted from 1.2 V up to the input voltage with an external voltage divider. External compensation and soft-start allow for design optimization and flexibility. High-frequency operation allows for all-ceramic solutions and small footprints. In addition, a user-selectable current limit provides protection against output overload and short circuit. FAN8060 features pulse skipping to achieve higher efficiency during light load operation. 100% duty cycle capability enables power solutions to extend the drop out voltage. Provision for external synchronization allows users to minimize input capacitors and manage EMI in solutions. FAN8060 is available in a green, low profile, 10-Lead 3x3 mm MLP package. HI LO EN PVIN SYNC AVIN SS FAN8060 SW CSS CA COMP RC AGND CC FB PGND INPUT 2.5 to 5.5V OUTPUT LOUT 1.2V to 5.5V R2 CIN COUT R3 Figure 1. Typical Application Circuit Ordering Information Part Number FAN8060EMPX Operating Temperature Range -40 to +85°C Package 10-Pin, 3x3 mm Molded Leadless Package (MLP) Packing Method Tape & Reel For Fairchild’s definition of “green” Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2013 Fairchild Semiconductor Corporation FAN8060 • Rev. 1.0.1 www.fairchildsemi.com 1 page Functional Block Diagram SYNC AVIN 450k To Internal Supply EN Enable & Reference 4uA Vref ++ SS ++ GM -- FB + + Slope Compensation Oscillator OTP PWM + - 1 .4V Pulse Skip COMP Sho rt Circuit Protection Figure 3. Functional Block Diagram + Current Sense - Log ic & Driver + - Low Current Detect AGND PVIN SW PGND © 2013 Fairchild Semiconductor Corporation FAN8060 • Rev. 1.0.1 5 www.fairchildsemi.com 5 Page PCB Layout Recommendations The switching power supply PCB layout needs careful attention and is critical to achieving low losses and clean and stable operation. Although each design is different, below are some general recommendations for a good PCB layout.  Keep the high-current traces and load connectors as short and wide as possible. These traces consist of VIN, GND, VOUT, and SW.  Place the input capacitor, the inductor, and the output capacitor as close as possible to the IC terminals.  Keep the loop area between SW node, inductor, and output capacitors as small as possible; minimizing ground loops to reduce EMI issues.  Route high-dV/dt signals, such as SW node, away from the error amplifier input/output pins.  Keep components connected to the FB and COMP pins close to the pins. Figure 16. Recommended PCB Layout © 2013 Fairchild Semiconductor Corporation FAN8060 • Rev. 1.0.1 11 www.fairchildsemi.com 11 Page

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