Peter Khairolomour Nov 2010 Mobile Power Solutions FAN5400 USB Switching Charger Product Presentation Peter Khairolomour Nov 2010

Where Does the USB Charger Fit In? Core Power and Battery management provides power for battery, I/O, core processors, memory, and interface processors. Specific applications include application processors, image processors, SD Flash memory, WiFi processors, and HDMI processors. Company Confidential

FAN5400 Switching Li-Ion Battery Charger More energy efficient charging = charge time savings! Linear charging IC 2.5W 1.8W USB POWER 5V @ 500mA Switching charging IC 2.5W 2.35W USB POWER 5V @ 500mA FAN5400 Company Confidential

Charging Cycle 4.2V 3.3V 3.0V Charge Time Most time spent between 3.3V and 4.2V during charging cycle Best you can do is charge current batteries at 1C….but batteries are now bigger Typical Smartphone will have >1500mA-h cell  1C=1.5A Anything less will likely be limited by two factors Max current available from source Thermal limitation of charging device Company Confidential

Linear Charger Charge Current ( Wall-Wart) 4.2V 3.3V 3.0V Charge Time Linear charger is nothing but an LDO Large dV leads to large power dissipation and thermal issues Consider MLP at 40C/W, typical of good thermal performance package Design for T=85C, and Tmax=125C, leave dT=40C for Temp Rise of Linear Charger Initial dV=1.7V (5.0-3.3) Imax=(40/40)*(1/1.7)=0.58A Company Confidential

Switching Charger Charge Current ( Wall-Wart) 4.2V Linear 3.3V 3.0V Charge Time Switching charger is nothing but a DC/DC Power Conversion using Inductor  High Efficiency Consider MLP at 40C/W, typical of good thermal performance package Design for T=85C, and Tmax=125C, leave dT=40C for Temp Rise of Charger Efficiency ~90% For Tj=40C/W and dT=40, @90%....1W can be the loss in the switching charger For 90%  10W from source @5V  2A!!!!  Limited to 1C battery!!!! Company Confidential

Currently FAN5400 has 20V Protection FAN5400 At a High Level Faster charge times with USB power / Fully USB Compliant Lower operating temperature compared to Linear charger Inductor can be re-used to support the USB-OTG function 20V integrated input protection Currently FAN5400 has 20V Protection Company Confidential

Package Options 20 bump WLCSP, 1.96x1.87mm, 0.4mm pitch Top View

FAN5400: USB Compliant, Faster Charging/Lower Thermals, and Better Usage of Battery Capacity Fully USB Compliant Selectable Input OCP with +/-5% accuracy. High accuracy allows for faster charge without violating current limit. 100mA 500mA 800mA No Limit Integrated 20V OVP Limit which protects against out of USB spec electrical events. Otherwise customers are often forced to use a standalone device adding cost. 300mA 5V boost for USB OTG (using the same inductor that is used for charging reduces cost) Faster Charging and Lower Thermal Dissipation Highly efficient switching regulator topology using a small 1uH inductor 1.25A Max Charge Current Better Usage of Battery Capacity High accuracy of +/-0.5% charge voltage accuracy allows for more “topping out” of battery which allows for more energy to be stored in a given battery Company Confidential

Design-In support and Contacts FAN5400 Datasheet http://www.fairchildsemi.com/ds/FA/FAN5400.pdf FAN5400 Product Overview http://www.fairchildsemi.com/pf/FA/FAN5400.html Evaluation Boards Request via Sales Center or contact product line Samples Available from samples warehouse or contact product line Marketing contacts Peter Khairolomour peter.khairolomour@fairchildsemi.com