TCA62735AFLG TOSHIBA CMOS INTEGRATED CIRCIUTS SILICON MONOLITHIC TCA62735AFLG Charge Pump type DC/DC Converter for White LED Driver The TCA62735AFLG is a charge pump type DC/DC Converter specially designed for constant current driving of White LED. This IC can outputs LED current 120mA or more to 2.8-4.2V input. This IC observes the power-supply voltage and the output voltage, and does an automatic change to the best of step up mode 1, 1.5 or 2 times. It is possible to prolong the battery longevity to its maximum. This IC is especially for driving back light white LEDs in LCD of PDA, Cellular Phone, or Handy Terminal Equipment. Weight: 0.016 g (Typ.) Characteristics • • • • • • • • • Fabricating with CMOS Process Package : QFN16 (4mm × 4mm × 0.8mm) Input Voltage : 2.8V (Min) Output Voltage : 4.2V (Min) Switching Frequency : 1MHz(Typ.) Output Drive Current Capability : Greater than 120mA 4 Channels Built in Constant Sink Current Drivers Sink Current Adjustment by External Resistance Soft Start Function • Output Open Detection Function • Integrated protection circuit TSD (Thermal Shut Down) Pin Assignment (top view) ILED4 ILED3 ILED2 ILED1 Application Diagram C1 1.0µF EN GND CTL0 C2+ CTL1 C2− CTL2 C1− C1– C2– VIN ILED1 ILED2 ILED3 ILED4 GND ISET VIN=2.8~4.2V C2 1.0µF VOUT C1+ VIN VOUT ISET C2+ EN CTL0 CTL1 CTL2 CIN 2.2µF Company Headquarters 3 Northway Lane North Latham, New York 12110 Toll Free: 800.984.5337 Fax: 518.785.4725 C1+ Web: www.marktechopto.com | Email: [email protected] COUT 1.0µF 30mA 30mA 30mA 30mA RSET 8kΩ California Sales Office: 950 South Coast Drive, Suite 225 Costa Mesa, California 92626 Toll Free: 800.984.5337 Fax: 714.850.9314 TCA62735AFLG TENTATIVE Block Diagram C2+ C2− C1+ C1− VIN VOUT Feed Back Circuit Up Converting Time Change Feed Back ILED1 ON/OFF EN ILED 2 CTL0 ILED 3 Control Logic CTL1 ILED 4 CTL2 Constant Current Regulator ISET GND Explanation of Terminals No Symbol 1 EN 2 CTL0 3 CTL1 4 CTL2 5 ISET Resistance connection terminal for setting up output current. 6 VOUT Output terminal. 7 VIN 8 C1+ 9 C1− 10 C2− 11 C2+ 12 GND 13 ILED4 14 ILED3 15 ILED2 16 ILED1 Function Logic input terminal. (input a chip enable signal) EN = ”H” → Operation mode, EN = ”L” → Shutdown mode Logic input terminal. (Selection of an output number) Please refer to the truth table on page 10. Power supply terminal. Capacitance connection terminal for charge pump. GND terminal. Constant Sink Current Driver terminal. ILED(mA) = 0.61V × 400 / RSET(kΩ) This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 2 of 12) TCA62735AFLG TENTATIVE Absolute Maximum Ratings (Topr = 25°C if without notice) Characteristics Symbol Ratings Unit Voltage VIN −0.3~+6.0 V V o l t a g e Vin −0.3~VIN+0.3(*1) mA O u t p u t C u r r e n t IOUT 200 mA/ch Operating Temperature Topr −40~+85 °C Storage Temperature Tstg −55~+150 °C Junction Temperature Tj 150 °C Power Supply I n p u t *1 : please do not exceed 6V. Recommended Operating Condition (Topr=-40°C to 85°C if without notice) Characteristics P o w e r S u p p l y Symbol Test Condition Min Typ Max Unit VIN - 2.8 - 4.2 V Logic Input Voltage Vin EN,CTL0,CTL1,CTL2 0 - VIN V Input Ripple Voltage VIN(ripple) - - - 40 mVpp Capacitance for Charge Pump C1,C2 - 0.8 1.0 2.2 µF Capacitance for output COUT - 0.8 2.2 4.7 µF CIN - 0.8 2.2 10.0 µF RSET - 2 8 80 kΩ Unit Capacitance R for input r e s i s t a n c e S E T Electrical Characteristics DC-DC Regulator part (VIN=3.6V, Topr=-40 to 85°C, if it is not specified.) C h a r a c t e r i s t i c s Output Current Consumption Ability Symbol IOUT(MAX) Current IIN(ON) Stand By Consumption Current IIN(OFF) T O T Typ Max 2 time up converting 120 - - 1.5 time up converting 120 - - 1 time up converting 120 - - IOUT=5mA - 1 2 mA - 0 1 µA - - IOUT=0mA EN=”L” mA EN, CTL0,CTL1,CTL2 VIN=2.8V to 4.2V 0.7VIN w VIL EN,CTL0,CTL1,CTL2 VIN=2.8V to 4.2V - - 0.3VIN Current Ileak EN,CTL0,CTL1,CTL2 - - 0.1 µA F r e q u e n c y fOSC - - 1000 - kHz RON 1.5 time up converting - 5 10 Ω VTRANS1X LED Vf=3.6V,IOUT=80mA VIN falling - 4.0 - V H L Input C l o c k Min VIH Logic Input V o l t a g e Logic Test Condition A L i g h o R O N 1X mode to 1.5X mode t r a n s i t i o n v o l t a g e This datasheet is tentative, the values and contents are subject to change without any notice. V 2005-04-26 (Page 3 of 12) TCA62735AFLG TENTATIVE Constant Current Driver part (VIN=2.8V to 4.2V, Topr=-40 to 85°C, if it is not specified.) Characteristics Symbol Constant Current Drive Setting ILED1~4 ISET Terminal Output Voltage VSET Constant Current Between Chs |ILED-LED-ERR| A c c u r a c y Between ICs |ILED-ERR| Constant Sink Current S u p p l y Vo l t a g e R e g u l a t i o n |∆ILED| Output leakage current ILEAK1~4 Test Condition Min Typ Max Unit RSET=47kΩ RSET=12kΩ RSET=8.2kΩ RSET=8.2kΩ VIN=3.6V center VIN=2.8 to 4.2V IOUT=80mA CIN=2.2µF EN="H" ILED1 to4="OFF" − − 5.1 19.6 28 0.61 2.5 5 − − − 1 − % − − 1 µA mA V % % Reference data Efficiency vs. IOUT Efficiency vs. VIN 100 90 80 50 40 30 20 10 0 Efficiency (%) Efficiency (%) 100 90 80 70 60 VIN=3.0V VIN=3.3V VIN=3.6V LED Vf=3.3V 70 60 50 40 30 VIN=3.9V 20 VIN=4.2V 10 4LEDs at 20mA LED Vf=3.51V 0 0 20 40 60 80 IOUT (mA) 100 4.3 120 Quiescent Current vs. VIN 4.0 4.1 3.9 3.7 3.5 3.3 VIN (V) 3.1 2.9 2.7 Quiescent Current vs. IOUT Current 4.0 VIN=2.7V 3.5 Quiescent Current (mA) Quiescent Current (mA) 3.5 3.0 2.5 2.0 1.5 1.0 4LEDs at 30mA 4LEDs at 20mA 0.5 4LEDs at 5mA 0.0 VIN=3.6V VIN=4.3V 3.0 2.5 2.0 1.5 1.0 0.5 0.0 2.8 3.0 3.2 3.4 3.6 VIN (V) 3.8 4.0 4.2 20 This datasheet is tentative, the values and contents are subject to change without any notice. 40 60 80 100 IOUT Current (mA) 2005-04-26 (Page 4 of 12) 120 TCA62735AFLG TENTATIVE IOUT Current vs. VIN 160 4LEDs at 30mA 4LEDs at 30mA 4LEDs at 20mA 35 4LEDs at 20mA 4LEDs at 5mA 4LEDs at 5mA ILED Current (mA) IOUT Current (mA) 140 ILED Current vs. VIN 40 30 120 25 100 20 80 15 60 10 40 20 5 0 0 2.8 3.0 3.2 3.4 3.6 VIN (V) 3.8 4.0 4.2 2.8 3.0 3.2 3.4 3.6 VIN (V) 3.8 4.0 1x Mode Transition V oltage vs. ILED Current 4.1 VIN_transition voltage (V) 4.0 3.9 3.8 3.7 3.6 LED Vf=3.2V,4c h ON 3.5 LED Vf=3.4V,4c h ON LED Vf=3.6V,4c h ON 3.4 5 10 15 20 ILED Current (mA ) Evaluation Circuit 25 30 VIN=2.8V to 4.2V RSET=8.2kΩ to 47kΩ A COUT=1.0µF C1- CTL2 ILED1 CTL0 ILED2 C2+ ILED3 CTL1 ILED4 C2- GND CIN=2.2µF ISET VOUT VIN C1+ C1=1.0µF C2=1.0µF V EN V A • Evaluation conditions LED : NACW215 (NICHIA Corp.) CIN : C1608JB1C225K (TDK Corp.) : C1608JB1C105K (TDK Corp.) COUT C1 : C1608JB1C105K (TDK Corp.) C2 : C1608JB1C105K (TDK Corp.) This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 5 of 12) 4.2 TCA62735AFLG TENTATIVE Method of setting ILED The current of the terminal ILED1 to 4 is set by resistance RSET connected with the terminal ISET. ILED can be set according to the next expression. ILED[mA] = 400 × 0.61[V] RSET[kΩ] RSET vs. ILED 35 30 ILED(mA) 25 20 15 10 5 0 0 20 40 RSET（kΩ） 60 RSET VIN=2.8V to 4.2V CIN=2.2µF COUT=1.0µF CTL2 CTL0 GND ILED1 C2+ ILED2 CTL1 ILED3 C2- ILED4 C2=1.0µF ISET C1- VOUT VIN C1+ C1=1.0µF EN This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 6 of 12) TCA62735AFLG TENTATIVE Method of Current Dimming control 1) Input PWM signal to SHDN terminal ILED can be set according to the next expression. ILED[mA] = 0.61[V] × 400 × ON Duty[%] RSET[kΩ] fPWM will recommend 100Hz. PWM Duty vs . IOUT 100 Ch1 : VPWM IOUT (mA) 80 Ch2 : IIN Ch3 : VOUT 60 40 20 Ch4 : IOUT 0 0 RSET=12kΩ 20 40 60 PWM Duty (%) 80 100 VIN=3.6V CIN=2.2µF COUT=1.0µF CTL2 CTL0 GND ILED1 C2+ ILED2 CTL1 ILED3 C2- ILED4 C2=1.0µF ISET C1- VOUT VIN C1+ C1=1.0µF EN PWM signal fPWM=100Hz, ON Duty50% *In this PWM control operation, This IC repeats ON/OFF. In this result, rush current is occur when ON timing with supplying charge to C2OUT. Please note it. This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 7 of 12) TCA62735AFLG TENTATIVE 2) Input analog voltage to ISET terminal 1. Precondition • Please set the range of the analog voltage input by 0 to 0.61V. 2. The maximum current is defined as αmA. R1[kΩ] + R2[kΩ] α[mA] = 0.61[V] × × 400 R1[kΩ] × R2[kΩ] 3. A minimum current is defined as βmA. β[mA] = 0.61[V] × 1 × 400 R2[kΩ] 4. ILED can be set according to the next expression. β[mA] - α[mA] ILED[mA] = VADJ[V] × 0.61[V] + α[mA] ILED vs. VADJ 25 ILED (mA) 20 15 10 5 0 0 0.2 0.4 0.6 VADJ (V) VADJ=0V to 0.61V R2=47kΩ VIN=2.8V to 4.2V R1=16kΩ CIN=2.2µF COUT=1.0µF C1- ISET CTL2 CTL0 GND ILED1 C2+ ILED2 CTL1 ILED3 C2- ILED4 C2=1.0µF VOUT C1+ VIN C1=1.0µF EN *This method is without repeating IC ON/OFF, and no need to consider holding rash current. This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 8 of 12) TCA62735AFLG TENTATIVE 3) Input Logic signal User can adjust ILED with Logic signal input as indicated in recommended circuit. The Resistor connected the ON-State Nch MOS Drain and RSET determines ILED. ILED can be set according to the next expression. ILED[mA] = 400 × 0.61[V] R[kΩ] About combined resistance R[kΩ] M1 M2 ON ON ON OFF OFF ON OFF OFF R[kΩ] RSET[kΩ] × R1[kΩ] × R2[kΩ] R1[kΩ]×RSET[kΩ] + R2[kΩ]×RSET[kΩ] + R1[kΩ]×R2[kΩ] RSET[kΩ] × R1[kΩ] RSET[kΩ] + R1[kΩ] RSET[kΩ] × R2[kΩ] RSET[kΩ] + R2[kΩ] RSET[kΩ] R2 M2 R1 M1 RSET VIN=2.8V to 4.2V CIN=2.2µF CTL2 CTL0 GND ILED1 C2+ ILED2 CTL1 ILED3 C2- ILED4 C2=1.0µF VOUT VIN C1+ C1- ISET COUT=1.0µF C1=1.0µF EN *This method is without repeating IC ON/OFF, and no need to consider holding rash current. This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 9 of 12) TCA62735AFLG TENTATIVE Selection of an output number by CTL0, CTL1, and CTL2 Terminal Truth Table Input CTL2 L L L L H H H H L L L L H H H H CTL1 L L H H L L H H L L H H L L H H Output CTL0 L H L H L H L H L H L H L H L H EN H H H H H H H H L L L L L L L L ILED4 OFF OFF OFF ON OFF OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF ILED3 OFF OFF ON OFF OFF ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF ILED2 OFF ON OFF OFF ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF ILED1 ON OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF *Soft Start Function This device is integrated Soft start function. When the power supply is ON or output is started to operate, the transition time is controlled in order to decrease the rush current. (Reference data: The output voltage is time 200µs of made from 0 to 4.0V at the VIN=2.8V time.) *Inrush Current of Input Current The inrush current flows when start-up and mode switching. (Reference data: Inrush current at CE1/CE2="L" to “H” is 500mA.) *Thermal Shut Down Function This device has Thermal Shutdown Function to protect from thermal damage when the output is shorted. The temperature to operate this function is set around from 140 to 160°C. (This is not guaranteed Value.) *The Selection of Capacitor for Charge Pump, Input and Output The input capacitor is effective to decrease the impedance of power supply and also input current is averaged. The input capacitor should be selected by impedance of power supply, it is better to choose with lower ESR (Equivalent Series Resistor). (i.e. ceramic capacitor etc.) Regarding to the capacitance values, it is recommended to choose in the range from 0.8 µF to 10 µF, however larger than 2.2 µF should be better. The output capacitor is effective to decrease the ripple noise of the output line. Also, it is better to choose the capacitor.) Regarding to the capacitance values, it is recommended to choose in the range from 0.8 µF to 4.7 µF, however larger than 2.2 µF should be better. The capacitor for charge pump operation is also selected the capacitor with low ESR. .) Regarding to the capacitance values, it is recommended to choose in the range from 0.8 µF to 2.2 µF, however larger than 1.0 µF should be better. This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 10 of 12) TCA62735AFLG TENTATIVE Package Dimensions QFN16 Unit : mm 4.00Typ. 4.00Typ. 3.75Typ. 3.75Typ. 0.9MAX + 0.07 0.28 - 0.05 0.25MIN + 0.15 0.60 0.10 0.65Typ. Weight: 0.016 g (Typ.) This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 11 of 12) TCA62735AFLG TENTATIVE Regarding solder ability Regarding solder ability, the following conditions have been confirmed. ● Solder ability (1) Use of Sn-63Pb solder bath • solder bath temperature = 230°C, dipping time = 5 seconds, number of times = once, use of R-type flux (2) Use of Sn-3.0Ag-0.5Cu solder bath • solder bath temperature = 245°C, dipping time = 5 seconds, number of times = once, use of R-type flux NOTES • Utmost care is necessary in the design of the output line, VCC, COMMON and GND line since IC may be destroyed due to short-circuit between outputs, air contamination fault, or fault by improper grounding. • Do not insert devices in the wrong orientation. Make sure that the positive and negative terminals of power supplies are connected correctly. Otherwise, the rated maximum current of power dissipation may be exceeded and the device may break down or undergo performance degradation, causing it to catch fire or explode and resulting in injury. • Please take care that IC might be destroyed in case external components were destroyed or not connected exactly. RESTRICTIONS ON PRODUCT USE 030619EBA • The information contained herein is subject to change without notice. • The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of TOSHIBA or others. • TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability Handbook” etc.. • The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer’s own risk. • The products described in this document are subject to the foreign exchange and foreign trade laws. • TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced and sold, under any law and regulations. This datasheet is tentative, the values and contents are subject to change without any notice. 2005-04-26 (Page 12 of 12)