FAN5358 2MHz, 500mA, SC70 Synchronous Buck Regulator Product Guide Peter Khairolomour, Aug 11th 2010

What is the FAN5358? FAN5358 is a 2MHz 500mA fixed output voltage step-down converter Vin: 2.7V – 5.5V Vout: 1.0V, 1.2V, 1.3V, 1.8V 2MHz Switching frequency 500mA Output current

Power in → Power out! Input sources Output loads: Vin: 2.7V – 5.5V Output loads: Vout: 1.0V, 1.2V, 1.3V, 1.8V USB Power 4.5V – 5.5V Memory ICs (Flash, SDRAM) Digital Asics DC supply FPGAs Microcontroller/processor cores Single cell Li-ion FAN5358 Digital Signal Processors (DSP) 3 battery cells Low Voltage LDOs High Voltage regulator

FAN5358 2MHz 500mA SC70 step-down DC/DC Features 2MHz Variable-Frequency Operation 500mA Output Current 24µA Typical Quiescent Current VOUT = 1.0V, 1.2V, 1.3V, 1.8V Up to 90% Efficiency L = 2.2uH CIN = 2.2μF COUT = 4.7μF 2.7V to 5.5V Input Voltage Range Synchronous Operation Soft-Start Capability UVLO, TSD, and SCP Protection SC70-6 Applications DMB, Mutimedia, Application processors Cell Phones, Smart-Phones WLAN DC-DC Converter Modules PDA, DSC, PMP, and MP3 Players Schedule Samples: NOW(1.0, 1.2, 1.8V) Production: Jun 2009 (1.8V) pin-to-pin with MAX8640Y but with higher efficiency and better transient response

Efficiency Comparison Both solutions are pin-to-pin compatible

Two type of loads: Digital and Analog Before diving into FAN5358 product details it is important to understand that there are two major point of load categories in portable applications Digital loads application processors baseband processors memory digital TV processors GPS processors graphics processors I/O rails Analog loads audio amplifiers RF amplifiers camera sensors PLL/FLL/VCO GPS receivers FAN5358 is targeted towards digital loads

Digital vs. Analog loads Digital Loads… Because of the inherent binary nature of digital loads, they are not as sensitive to power supply behavior such as ripple noise, thermal noise, or noise interference. They have fast dynamics as the application load can vary quickly and substantially so parameters such as power supply transient response and Iq during standby become critical They operate at low voltages due to fine geometries used in core processors. In addition, power is reduced by operating off lower voltage rails. Typical range is 1V to 1.8V. Analog Loads… Because of the inherent sensitive nature of analog loads, noise issues that were not so much a concern for digital loads can now create problems ripple and noise feed through are typically less tolerable for sensitive analog loads analog loads typically do not share power supply inputs in order to preserve signal integrity each analog IC may have different voltage levels optimized for performance and tend to operate at a higher voltage and lower current than digital ICs.

Many digital loads in cell phones! BaseBand Processor (BB) Keyboard controller Bluetooth transceiver with baseband processor Graphics Processing Unit (GPU) Digital Base Band Processor with Main Central Processor (CPU) and Digital Signal Processor (DSP) Image Sensor Processor (ISP)

Ultra-portables Example: Media Player

Computer accessories Example: Access card

Computer peripherals: Example: Printer

Industrial Example: Bar Code Scanner

Medical Example: Electronic Stethoscope

Instrumentation Example: National Instruments Data Acquisition card (Labview)

FAN5358 Value Proposition… SC70 package easy to pick and place Low cost total solution High performance in terms of efficiency and mode transition smoothness. The former extends battery life and the latter generates less system noise.

Design-In support FAN5358 Datasheet http://www.fairchildsemi.com/ds/FA/FAN5358.pdf FAN5358 Product Overview http://www.fairchildsemi.com/pf/FA/FAN5358.html Evaluation Boards Request via Sales Center or contact product line Samples Available from samples warehouse or contact product line

Contacts Marketing contacts Application support Cell phones and data cards Peter Khairolomour peter.khairolomour@fairchildsemi.com All other customers Stephen Stella stephen.stella@fairchildsemi.com Application support George Petre george.petre@fairchildsemi.com

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