DC/DC Regulator Makes Efficient Use of PCB Space and Power

TinyBuck™ DC/DC regulators, from Fairchild Semiconductor®, enable power designers to achieve higher output current and efficiency using less PCB space.

The FAN2108 is an 8A, fully-integrated, synchronous buck converter that drives efficiency over a wide input-voltage range from 3V to 24V. Other solutions achieve efficiency by using additional discrete components, lengthening design time and increasing the size of the end application. The FAN2108, however, integrates the controller, MOSFETs, and boot diode into a 5mm x 6mm MLP package.

Designed with Fairchild’s PowerTrench® MOSFET process with a low Figure Of Merit (FOM), the FAN2108 reduces both conduction and switching losses. For example, at 12V input voltage and 8A load current, the FAN2108 delivers 92% efficiency with a 3.3V output or 87% efficiency with a 1.8V output.

At 5V input voltage and 3.3V output, this device achieves a peak efficiency of 95%.

Additionally, the FAN2108 offers multiple protection features that deal with over-voltage, over-current, short-circuit and over-temperature situations. The DC/DC regulator features pre-bias start-up and ensures that the output is not discharged during the soft-start cycle, protecting system ICs from damage. The extended device family includes a 3A version (FAN2103) and a 6A version (FAN2106).

 

FEATURES Integrated Schottky diode on low-side MOSFET Over 95% peak efficiency 3V to 24V input-voltage range Output-voltage range from 0.8V up to 80% of input voltage 8A output current 200kHz to 600kHz programmable-frequency operation Input under-voltage lockout Programmable current limit Under-voltage, over-voltage, and thermal-shutdown protections Internal soft-start

APPLICATIONS Servers Point-of-load regulation High-end computing systems Graphics cards Battery-powered equipment Set-top boxes

 

 

 

• Vishay’s 30CTT045/60CPT045, page 090211

 

Fairchild / FAN2108