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| POWER&RF Step-up DC-DC converter IC DC-DCIC TK11855F-G DESCRIPTION The TK11855F-G is a PWM step-up DC-DC converter IC designed for white LED driver applications suitable for 2 to 4 LEDs in series. The white LEDs are connected in series and driven at a constant current, resulting in uniform brightness and high efficiency. Its reference voltage is a very low 0.5V, achieving high efficiency operation with the constant current output. It can also be used in general applications as a step-up DCDC converter. TK11855F-G2~4LED PWMDC-DCIC LED 0.5V DC-DC FEATURES Very High Efficiency 85% Operating Voltage Range 2.65V to 16V Operating Frequency 570kHz Maximum Duty Cycle 85% Built in Switching Transistor Built in Open-circuit protection On/off Control Very Small Inductor Available 0.75mm Low Profile Package SON3024-8 85 2.65V to 16V 570kHz 85 On/off 0.75mmSON3024-8 APPLICATIONS The White LED Driving Systems: 2 to 4 For Back-lighting and Front-lighting, Flashlights etc. Mobile Communication Systems: Cellular Phone, PHS, DSC, PDA, Computer Peripheral Equipment Battery & Dry Cell Battery Systems Portable Equipment Step-up DC-DC Converter (Voltage Supply) Camera, Radio, Communications Equipment etc VCD Bias LED: , , : PHSDSCPDA DC-DC VCD PACKAGE OUTLINE Part name TK11855F-G Package Marking Pin configuration AB0 See next page ORDERING INFORMATION Ordering information TK11855FTL-G SON3024-8 Package code F: SON3024-8 Environment code G: Lead free Storage direction TL: Left type ABSOLUTE MAXIMUM RATINGS Parameter Operating Voltage Range Operating Temperature Range Power Dissipation Symbol VOP TOP PD Rating 2.65 to 16.0 -30 to +85 600 Unit Remarks V C mW Board mount 2005 SPRING POWER&RF ELECTRICAL CHARCTERISTICS Parameter Operating Frequency Quiescent Current Shutdown Supply Current VFB Pin Voltage VFB Switching Current Limit Switching Saturation Voltage SW EN Pin Voltage EN Symbol f IIN,ON IIN,OFF VFB ISW,LIMIT VSW,SAT VENHIGH VENLOW IENIN VOVP DMAX MIN 400 1.4 253 0.35 1.2 0 18.0 85 25 20.0 90 Value TYP 570 2.3 0.01 267 0.60 0.12 MAX 740 3.2 1.0 281 0.90 0.3 20 0.3 40 22.0 Units kHz mA A mV A V V V A V % VIN=VEN=3.0V, TA=25C Conditions VFB=1V VEN=0V EN Pin Bias Input Current EN Open-Circuit Voltage OVP Maximum Duty Cycle ISW200mA VOUT: On VOUT: Off VEN=3V VFB=0V BLOCK DIAGRAM Reference 1 2 3 4 0.6V Oscillator PWM comp Output drive control 8 7 6 5 Over current detector Err amp 0.267V 4 W-LEDs DRIVER APPLICATION Designed Performance Input Voltage LED Current Oscillation Frequency Inductor Peak Current Coil (TOKO) VIN=2.7 to 6.5V ILED=20mA 570kHz 220mA Type DB318C A997AS-150M L TK11855F on/off VIN CIN 4.7F 1 2 3 4 En VIN GND VFB PGND SW OVP EA.OUT 8 7 6 5 ILED RLED 12 CEA 0.22F SBD COUT 2.2F 15H 2005 SPRING |
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