LT3484-0/LT3484-1/LT3484-2 Photoflash Capacitor Chargers FEATURES DESCRIPTIO Highly Integrated IC in 2mm 3mm DFN Package The LT 3484 family of photoflash capacitor charger ICs is Reduces Solution Size designed for use in digital camera and mobile phone Uses Small Transformers: applications where space is at a premium. The LT3484s 5.8mm 5.8mm 3mm patented control technique allows it to use extremely small Fast Photoflash Charge Times: transformers, and the improved NPN power switch re- 4.6s for LT3484-0 (0V to 320V, 100F, V = 3.6V) quires no external Schottky diode clamp, reducing solu- IN 5.7s for LT3484-2 (0V to 320V, 100F, V = 3.6V) tion size. Output voltage detection requires no external IN 5.5s for LT3484-1 (0V to 320V, 50F, V = 3.6V) circuitry as the transformer turns ratio determines final IN Operates from Two AA Batteries, or Any Supply from charge voltage. 1.8V up to 16V The devices feature a V pin, which allows the use of 2 BAT Controlled Average Input Current alkaline cells to charge the capacitor. The LT3484-0, -2 500mA (LT3484-0) and -1 have primary current limits of 1.4A, 1A and 0.7A 350mA (LT3484-2) respectively, resulting in tightly controlled average input 225mA (LT3484-1) current of 500mA, 350mA and 225mA respectively. The No Output Voltage Divider Needed three versions are otherwise identical. No External Schottky Diode Required The CHARGE pin gives full control of the part to the user. Charges Any Size Photoflash Capacitor Driving CHARGE low puts the part in shutdown. The DONE Available in 6-Lead 2mm 3mm DFN Package pin indicates when the part has completed charging. The U LT3484 series of parts are housed in a tiny low profile APPLICATIO S 2mm 3mm DFN package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other Digital Camera and Cell Phone Flash Charger trademarks are the property of their respective owners. Protected by U.S. Patents including 6636021. TYPICAL APPLICATIO LT3484-0 Photoflash Charger Uses High Efficiency 3mm Tall Transformers LT3484-0 Charging Waveform DANGER HIGH VOLTAGE OPERATION BY HIGH VOLTAGE V = 3.6V IN TRAINED PERSONNEL ONLY C = 100F OUT 1:10.2 V BAT 320V 2AA OR 1 4 1 TO 2 Li-Ion 4.7F 2 5 V OUT + 150F 50V/DIV V SW BAT PHOTOFLASH V CC CAPACITOR V IN AVERAGE 5V INPUT 0.1F LT3484-0 CURRENT 100k GND 1A/DIV 1s/DIV 3484 TA02 DONE CHARGE 348412 TA01 3484012f 1 U ULT3484-0/LT3484-1/LT3484-2 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW V Voltage .............................................................. 16V IN V Voltage ............................................................ 16V DONE 1 6 V BAT BAT SW Voltage ................................................... 1V to 50V CHARGE 5 SW 2 7 SW Pin Negative Current ...................................... 0.5A V 4 SW 3 IN CHARGE Voltage...................................................... 10V DONE Voltage .......................................................... 10V DCB6 PACKAGE 6-LEAD (2mm 3mm) PLASTIC DFN Current into DONE Pin .......................................... 1mA T = 125C = 73.5C/W JMAX JA EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB Maximum Junction Temperature .......................... 125C Operating Temperature Range .................40C to 85C ORDER PART NUMBER DCB6 PART MARKING Storage Temperature Range ..................65C to 150C LT3484EDCB-0 LBTM LT3484EDCB-1 LBTN LT3484EDCB-2 LBTP Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: