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| POWER&RF Step-up DC-DC converter DC-DCIC TK11880FTL-G (SON3024-8) DESCRIPTION The TK11880FTL-G is a step-up DC-DC converter designed for White LED driver applications, using constant frequency PWM architecture, with the following built in: a very high current switching transistor 0.6A peak), a high speed oscillator (1.0MHz), a switch over current detector, a low voltage reference (VRef=0.495V), an error amplifier, a PWM comparator, a zener diode for open-circuit protection and ON/OFF control. TK11880FTL-G can drive up to six White LEDs in series. This IC works with a very wide operation supply range (2.65V~10V) and the adjustable output voltage can be set as high as 24.5V. The white LEDs are connected in series and driven at a constant current, resulting in uniform brightness and high efficiency. The reference voltage is a very low 0.495V, achieving high efficiency operation with the constant current output. The ON/OFF control is built-in and the circuit current can be decreased when the EN pin is low (shutdown mode). The built-in zener diode can be used for open-circuit protection in case the output load is disconnected, such as the string of LEDs opened. The internal zener diode reduces the external component count. The TK11880FTL-G can also be used in other applications as a step-up DC-DC converter. The TK11880FTL-G is available in the SON3024-8 surface mount package. TK11880FTL-GLED PWMDC-DCIC 6LEDLED 0.5V DC-DC FEATURES Very wide operating voltage range (2.65 to 10V) 1.0MHz operation Internal switching transistor Maximum duty cycle 93% 24.5vMAX output Very small inductor available Very small package SON3024-8 2.65 to 10V 1MHz 93 24.5V 0.75mmSON3024-8 ABSOLUTE MAXIMUM RATINGS Parameter Operating voltage range Operating temperature range Power dissipation Operating frequency range Symbol Rating VOP 2.65 to 10.0 TOP -30 to +85 PD 600 fOP 1.0 Unit Remarks V C mW *Board mounted MHz ELECTRICAL CHARCTERISTICS VIN=3V, TA=25C Parameter Symbol MIN. Value Unit TYP. MAX. Conditions Oscillator section f 0.7 1.0 1.3 Operating frequency Error amplifier section (Vfb pin, Eaout pin) (VFB , EAOUT ) MHz 2005 FALL POWER&RF Parameter Symbol VIN=3V, TA=25C Value Unit Conditions TYP. MAX. 495 515 mV VFB=0V -0.2 1.0 A 40 dB 2 MHz AV=0dB 0.87 V VFB=0V 0.05 0.2 V VFB=1.0V -36 -21 VEAOUT=0.45V A VEAOUT=0.45V 36 A 93 25 1.3 0.12 0.01 20 0.3 55 1.8 0.2 2.0 % V V A A V A V V mA A VFB=0V On mode Shutdown mode VEN=3V MIN. Threshold voltage VEA 475 Input bias current VFB IEAIN -1.0 AV Voltage gain GBW Gain band width 0.78 Output high voltage VEAOUT,HIGH Output low voltage VEAOUT,LOW Output source current IEAOUT,SOURCE Output sink current 21 IEAOUT,SINK Dead time control section DMAX 88 Maximum duty cycle Shutdown section (En pin) (EN ) En input voltage + EN VEN,HIGH 1.2 En input voltage EN VEN,LOW 0 En pin input bias current EN IENIN Output switch section (Sw pin) (SW ) ISW,LIMIT 0.6 Switch current limit VSW,SAT Switch saturation voltage Switch leakage current ISW,OFF Open-circuit protection section (OVP pin) LED (OVP VOVP 25.0 Open-circuit voltage OVP Vin section (vin pin) (VIN ) Low voltage stop VIN,LOW 2.20 Quiescent supply current IIN,ON 2.4 IIN,OFF Shutdown supply current ISW=200mA VFB=1V, VSW=24.5V Iz=0.6mA ) 26.6 28.6 2.45 3.9 0.01 2.65 5.4 1.0 VFB=1V VEN=0V BLOCK DIAGRAM Reference 1 PWM comp Oscillator Output drive control 8 TK11880F 7 1 2 En VIN GND VFB PGND SW OVP EA.OUT 8 7 6 5 2 0.6V 3 Over current detector 6 3 4 4 Err amp 0.495V 5 6 W-LEDs DRIVER APPLICATION Designed Performance Parameter Value Input Voltage VIN=3.0 to 9.0V LED Current ILED=20mA Oscillation Frequency 1.0MHz Inductor Peak Current 300mA Coil (TOKO) Type DB318C 15H A997AS-150M Type D52LC 10H A914BYW-100M L TK11880F on/off VIN 1 2 CIN 4.7F 3 4 En VIN GND VFB PGND SW OVP EA.OUT 8 7 6 5 CEA ILED 1.0F SBD COUT 2.2F RLED 24 2005 FALL |
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