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

2. 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

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

4. 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

5. 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 ( )
Imax=(40/40)*(1/1.7)=0.58A
Company Confidential

6. 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 can be the loss in the switching charger
For 90%  10W from  2A!!!!  Limited to 1C battery!!!!
Company Confidential

7. 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

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

9. 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

10. Design-In support and Contacts
FAN5400 Datasheet
FAN5400 Product Overview
Evaluation Boards
Request via Sales Center or contact product line
Samples
Available from samples warehouse or contact product line
Marketing contacts
Peter Khairolomour