Sales Training Presentation FAN5340: Synchronous Constant-Current Series Boost LED Driver with Integrated Load Disconnect Sales Training Presentation

Introduction FAN5340 is a synchronous constant-current series boost LED driver with load disconnect that drives 2 to 4 white LEDs Compact and cost effective solution that provides superior performance Up to 85% efficiency Excellent LED Current Linearity Integrated Load Disconnect Small form factor: WLCSP-8, 1.57mm x 1.57mm Driving the LEDs in series provides one excellent benefit – it ensures that all LEDs will have equal brightness

FAN5340 Synchronous Constant-Current Series Boost LED Driver Reduces Start-up Transients and Audible Interference Features Synchronous Operation Up to 85% Efficiency 500mW Output Power Drives 2 to 4 WLEDs @ 40mA Integrated Disconnect Load Lower Audible Noise Saves Power during PWM Dimming Excellent PWM Linearity 1.2MHz Switching Frequency Output Over-Voltage Protection Pkg: WLCSP-8 & 3x3mm MLP Status Mobile Handsets MP3 Players Mobile Internet Devices Rugged Handheld PCs Portable Medical Equipment

FAN5340 Key Advantages Integrated Load Disconnect LED Current Linearity Equal LED Brightness

FAN5340: Load Disconnect FAN5340 integrates true load disconnect It provides 3 benefits: Input to output isolation Prevents leakage current to LEDs from input when FAN5340 is OFF Reduces audible noise generated by COUT capacitor Large voltage ripples on this capacitor causes audible noise by mechanical deformation in the ferroelectric compounds

FAN5340: LED Current Linearity FAN5340 dims the LEDs through PWM dimming at 300Hz to 1kHz To achieve linear LED current especially at low brightness levels, dimming duty cycle is <5% and requires a low PWM frequency i.e. 300Hz The graph on the left shows LED current linearity over the full range while the one on the right is for dimming duty cycle <2% Most LED drivers do not provide linear dimming at low LED current levels with a low dimming duty cycle. At these low light levels, the LED brightness tends to jump down from one level to the next (behave logarithmically) instead of a gradual progression as exhibited by a linear LED current FAN5340 enables excellent LED current linearity even at very low LED current and dimming duty cycle.

3. Equal LED Brightness LED Current 20mA Driving LEDs in series provides equal brightness in each LED Same amount of current is applied to each LED No need to worry about LED current matching FAN5340 drives LEDs in series which enables each LED to have the same brightness level as one another because there is the same amount of current going through each LED Parallel LED drivers have multiple channels and will need to be matched in order to achieve similar brightness levels but it will not be exactly equal unlike LED driven in series All LEDs are turned on since sufficient output voltage from FAN5340 is delivered to the LEDs in a string be it 2 to 4 LEDs

FAN5340 Objections Cannot Drive 4+ White LEDs Larger Size LED Driver EMI Noise

1. Unable to Drive 4+ LEDs FAN5340 is only able to drive up to 4 LEDs in series However FAN5333 and FAN5336 can drive up to 8 or 9 LEDs in series Also FAN5343 is available and it will be able to drive up to 6 LEDs FAN5340 was developed specifically to address backlighting opportunities that needed 2 to 4 LEDs to backlight LCD displays If the customer has a requirements to drive more LEDs then FAN5333 and FAN5336 are solutions currently available FAN5343 is also available and have output voltage of 24V so that up to 6 LEDs can be supported

2. Larger LED Driver Size FAN5340 is in 3x3mm MLP package which is larger than most LED drivers in the market However these other LED drivers are usually not synchronous or have an integrated load disconnect If size is an issue than FAN5340 is available in CSP Dimensions: 1.57 x 1.57mm As outlined in previous slide, load disconnect provides a number of benefits.

3. EMI Noise A major concern about using series boost LED drivers is that they radiate EMI EMI can be minimized by doing the following Compact part placement Reduce current loop Minimize parasitic board capacitance and inductance Fairchild can provide an optimized PCB layout file for designs If this is still a concern Fairchild has charge pump LED drivers: FAN5701 and FAN5702 that can be used to backlight LCDs There are some customers who are reluctant to use series boost LED drivers like the FAN5340 due to EMI concerns Designers should make the part placement of passive components and FAN5340 as compact as possible Reduce the current loop to minimize EMI (also a result of compact part placement) Minimize the size of the switch node which is where the SW pin of FAN5340 is connected to the inductor and do not put a ground plane underneath it

FAN5340 + FAN5640 Keypad Lighting LCD Backlight FAN5340 can be combined with FAN5640 to provide a “turn-key” lighting solution that can support driving LEDs to backlight the LCD display and keypad lighting in a number of applications ranging from portable electronics such as mobile handsets to payment kiosks. This solution does not require 2 inductors to drive all the LEDs. All that is needed is the one inductor for FAN5340 and the output from it is supplied to FAN5640 which can drive 2 strings of 3 LEDs. The maximum LED current of FAN5640 is determined by the output power of FAN5340 based on its lighting requirements. FAN5340 cannot exceed 500mW and therefore the “system” is constrained to this value. Please see the data sheet for more details.

FAN5340 Applications Mobile Handset Space Industrial/Measurement LCD Modules Camera Modules Mobile Internet Devices Industrial/Measurement Ruggedized Handhelds Measurement/Test Equipment Oscilloscopes Spectrum Analyzers Network Analyzers Payment Kiosks/Systems PC Products Ultra-Mobile PCs PC All-In-One Printers Portable Consumer Digital Still Cameras Video Camcorders MP3 Players PMP Players GPS Handhelds

FAN5340 Applications Main Displays in Mobile Handsets Main Displays in Medical Devices

FAN5340 Applications Main Display in Industrial/Embedded Devices Consumer Electronics

Potential FAN5340 Customers Mobile Handsets MP3/PMP Players Cameras & Camcorders Printers & Fax Machines Industrial & Measurement Nokia Apple Sony HP Motorola Sony/Ericsson Samsung Brother Intermec JVC Verifone iRiver Olympus Lexmark Tektronix LG Mobile Creative Labs Panasonic Canon Agilent Philips Kodak Epson Lecroy Pantech/Curitel Microsoft Casio OKI Rhode & Schwarz Fujitsu Nextar Nikon Anritsu NEC SanDisk Qualcomm Nintendo Broadcom Infineon ST/EMP

Summary FAN5340 is a high performance synchronous series boost LED driver solution for portable electronics It provides a number of key benefits to facilitate a better visual experience and electrical performance: LED current linearity Lower audible noise and lower power consumption through integrated load disconnect Small form factor Can be used in a variety of applications and can be combined with FAN5640 for a “turn-key” lighting solution

Pricing & Availability Fairchild Part Number Package Unit Price @ 1ku Availability FAN5340UCX WLCSP-8 $0.75 Now FAN5340MPX MLP-8 $0.79 August 2010

Technical Materials FAN5340 Datasheet http://www.fairchildsemi.com/ds/FA/FAN5340.pdf FAN5340 Product Overview http://www.fairchildsemi.com/pf/FA/FAN5340.html Evaluation Boards Request via Sales Center Samples http://www.fairchildsemi.com/ShoppingExperience/action/displayItems?itemType=SAMPLE&gpn=FAN5340

Marketing & Apps Contacts Marketing Contact Wayne Seto wayne.seto@fairchildsemi.com +1-408-822-2197 Applications Support Mark Barycza mark.barycza@fairchildsemi.com +1-408-822-2315

Appendix

FAN5333A/B Serial Boost LED Driver w/ Integrated 30V FET Switch Features DC-DC Boost Converter w/ Integrated 30V FET Switch Supports up to 3 Strings of 6 WLEDs (3 x 6) 75mA @ 25V Feedback Voltage FAN5633A: 110mV FAN5633B: 315mV Up to 1.5A Peak Switch Current 1.6MHz Switching Frequency Thermal Shutdown Pkg: SOT23-5 Status Samples & EVBs: Now Production: Now

FAN5336 Serial Boost LED Driver w/ Integrated 33V FET Switch Features DC-DC Boost Converter w/ Integrated 33V FET Switch Various Output Voltage Configurations: VOUT = 12V @ 125mA VOUT = 21V @ 75mA VOUT = 33V @ 10mA Able to support up to 3 Strings of 6 WLEDs (3 x 6) @ 25mA Up to 1.5A Peak Switch Current 1.5MHz Switching Frequency Thermal Shutdown Pkg: 3x3mm MLP6 Status Samples & EVBs: Now Production: Now

FAN5343 24V Asynch. Series Boost LED Driver w/ Single-Wire Features Asynchronous Serial LED Driver w/ Integrated Schottky Diode Up to 82% efficiency Supports up to 6 LEDs Single-wire digital interface Program 32 different brightness levels 1.2MHz switching frequency VIN = 2.7V to 5.5V Over-Voltage Protection Thermal Shutdown Protection Pkg: 2.0 x 2.0 x 0.90mm MLP8 Applications Mobile Handsets MP3 Players Mobile Internet Devices

FAN5701 180mA, 6-ch. LED Driver with 2 PWM Control Pins Features 1x/1.5x Charge Pump LED driver 6 LED outputs at 30mA each Up to 92% efficiency 2 PWM enable pins to control 2 default groups of 4 and 2 LED outputs Supports PWM dimming up to 20kHz 1.2MHz switching frequency Pkg: WLCSP-16 & 3x3mm UMLP16 Applications Mobile Handsets PMP and MP3 Players Mobile Internet Devices

FAN5702 180mA, 6-ch. LED Driver with I2C Interface Features 1x/1.5x Charge Pump LED driver 6 LED outputs at 30mA each Up to 92% efficiency I2C interface Configure Group A outputs from 2 to 6 LEDs Logarithmic dimming with 64 steps for each LED output Support external PWM dimming up to 20kHz 1.2MHz switching frequency Pkg: WLCSP-16 & 3x3mm UMLP16 Applications Mobile Handsets PMP and MP3 Players Mobile Internet Devices