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| Tentative TB62750FTG TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic TB62750FTG Step Up Type DC-DC Converter for White LED TB62750FTG is the high efficient STEP-UP type DC/DC converter by which the optimal design was carried out at constant current driver of white LED. It is possible to drive white LEDs whose constant output current is 800mA by the lithium ion battery. This IC contains the Nch-MOS transistor required for switching of external inductor. The forward current of LED is set up by the external resistor. This IC is the most suitable as a driver of camera flashes and strobes in the cellular phone, the PDA, the DSC, and other mobiles. Features Switching terminal current Maximum output power Maximum output voltage Operating frequency Four operating modes Light mode Flash mode High efficiency :ILED=350mA(Typ.) (R3=8.2k,R2=62k) :ILED=800mA(Typ.) (RSENS=0.375) :Maximum efficiency : 80%(In the flash mode) Application VIN(3.04.2) L S-Di :1.8A(Typ.) : :10V :2MHz QON24-0404-0.65 Weight 0.09g (Typ.) Shutdown mode :Icc=0.01A(Typ.) Cin OVP Cout VIN SW1SW2 SW3 K1 K2 K3 800mA (TYP) EN2 EN1 SS Css PGND1 PGND3 GND PGND2 IL RSENS1 RSENS2 RSENS3 FB+ FBR3 R4 R2 Company Headquarters 3 Northway Lane North Latham, New York 12110 Toll Free: 800.984.5337 Fax: 518.785.4725 Web: www.marktechopto.com | Email: info@marktechopto.com California Sales Office: 950 South Coast Drive, Suite 265 Costa Mesa, California 92626 Toll Free: 800.984.5337 Fax: 714.850.9314 Tentative Pin TB62750FTG Assignment (top view) PGND1 17 PGND2 PGND3 18 OVP EN2 EN1 AGND VIN NC SW1 16 SW2 SW3 14 15 13 12 SS 11 IL 10 NC 9 NC 8 FB7 FB+ 19 20 21 22 23 24 1 K3 2 RSENS3 3 K2 4 RSENS2 2 5 K1 6 RSENS1 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative Block Diagram L VIN Cin VIN 23 OVP 14 16 18 S-Di TB62750FTG Cout 19 SW1 SW3 SW2 K1 EN2 EN1 IL R2 SS Css 20 21 11 FB+ 12 AGND 22 17 15 13 PGND1 PGND2 PGND3 FB8 7 R3 6 RSENS2 RSENS1 4 R1 RSENS3 2 K2 K3 5 3 1 3 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative Explanation of the Terminal No. Symbol Function TB62750FTG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 K3 RSENS3 K2 RSENS2 K1 RSENS1 FB+ FBNC NC IL SS PGND3 SW3 PGND2 SW2 PGND1 SW1 OVP EN2 Connected to the LED cathode. Connected to the current-setting resistor: R1 for the flash. Connected to the LED cathode. Connected to the current-setting resistor: R1 for the flash. Connected to the LED cathode. Connected to the current-setting resistor: R1 for the flash. Detecting the voltage of the current-setting resistor: R1 for the flash. It can change the light-mode-current with the resistor: R3 which is connected to FB+. No Connect No Connect Connected to the ILED setting resistor: R2 in the light mode. The light-mode-current is changed depending on the setting ratio of R2 and R3. Setting the constant to limit the current when DC-DC operation starts. The rising time is changed depending on the constant of the condenser. Ground terminal for the power device. Switching the DC-DC converter. Nch MOSFET is built-in. Ground terminal for the power device. Switching the DC-DC converter. Nch MOSFET is built-in. Ground terminal for the power device. Switching the DC-DC converter. Nch MOSFET is built-in. Detecting the over-voltage. Inputting the logic signals which set the modes. "ON" "OFF" :Flash mode :Lighting mode :DC-DC operation 21 EN1 Inputting the logic signals which set the modes. "ON" "OFF" :Stop 22 23 24 AGND VIN NC Ground terminal for analog. Inputting the power supply voltage to the IC. The operating voltage is 2.8 to 5.5V. No Connect 4 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative Absolute Maximum Ratings (Topr = 25C if not specified) TB62750FTG Characteristics Symbol Ratings Unit Power supply voltage Input voltage Switching terminal voltage Output current Operating temperature range Storage temperature VCC Vin Vo(SW) Iout Topr Tstg - 0.3 6.0 - 0.3 VIN + 0.3 - 0.3 12 1000 - 40 85 - 55 150 V V V mA C C Recommended Operating Condition (Topr = -40 to 85C if not specified) Characteristics Symbol Test Conditions Min. Typ. Max. Unit Power supply voltage Logic HIGH Input LOW Voltage Constant-current output ISET Resistor Flash mode Light mode VIN VIH VIL Iout R1 R2 R3 Cin Cout Css L EN1,EN2 - 2.8 0.7XVIN -0.15 51 2200 - 800 0.375 62 8.2 20 10 3300 3.9 5.5 VIN +0.15 0.3X VIN 1000 75 10000 - V V mA k k F F pF H Input condenser Output condenser Condenser for soft start External inductor 5 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative TB62750FTG Electrical Characteristics (Topr = -40~85C VCC = 2.8~5.5 V if not specified.) Characteristics of DC-DC regulator. Characteristics (Topr = - 4085C, VIN = 2.85.5V if not specified) Symbol Test Conditions Min. Typ. Max. Unit Power supply voltage VIN EN1="H", EN2="L" 2.8 - 5.5 V Operating consumption current IIN(On) Vin=3.6V, R2=62k R3=8.2k, R1=0.375 - TBD - mA Quiescent consumption current Input current (Logic input terminal) Integrated MOS-Tr switching frequency IIN(Off) EN1="L", EN2="L" Vin=3.6V Vin=3.6V - 0.01 0.5 A IINEN1 IINEN2 - - 0.5 A fosc Vin=3.6V 1.6 2 2.4 MHz SW terminal protection voltage Vo(SW) - - 12 - V Switching terminal current Io(SW) - - 1.8 - A Switching terminal leakage current Ioz(SW) EN1="H", EN2="H" Vin=3.6V, R1=0.375 Topr=25 - 0.5 1 A 285 300 315 mV FB terminal feedback voltage VFB EN1="H", EN2="L" Vin=3.6V, R1=0.375 R2 = 62k,R3 =8.2k Topr=25 TBD 130 TBD mV FB terminal line regulation VFB Vin=3.6V (typ.) Vin=3.04.2V - 2 - % OVD voltage (OVD terminal) VOVD - - 10.7 - V TSD 120 157 180 6 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative Characteristics of constant-current of SINK(Topr = 25C, Vcc = 3.6V if not specified.) Characteristics Symbol Test Conditions Min. Typ. TB62750FTG Max. Unit ISET output current (Light mode) ISET output voltage (Light mode) Lighting time in flash mode ISET EN1 = "H" EN2 = "L" R2= 62k, R3= 8.2k R1 = 0.375 EN1 = "H" EN2 = "L" R2= 62k Tolerance time under EN2 = "H" and EN1 = "H". R1 = 0.375 - 20 - A VISET - TBD - V t FLASH - 100 300 ms 7 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative Explanation of operation Setting the operating mode 1.Selecting the four modes shown below with logic input terminals: EN1 and EN2. EN1 L L H H Flash mode EN2 L H L H MODE TB62750FTG Shutdown mode Light mode Flash mode It can be driven with the constant-current at 800mA (max.).The maximum lightning time is 300ms. Because it controls the FB+ at 300mV, the equation shown below is obtained. Iout(mA)=300(mV)/R1() Pay attentions to the differences of the connected resistors and the power consumption. The recommended resistor is as follows; Three or more resistors (1/4 W) in parallel. Light mode It can light continually by driving at constant-current (350mA in max.). It sets the current of K1 to K3 based on the resistors: R1, R2, and R3. 0.3V IoutmA R1 1.2VInternal VrefX R3 R2 The current value of IL is recommended at about 20A. Set R2 at 51k to 75k. When R3 is set at 0, the same current is set in the flash mode and the light mode. Shutdown mode It stops the operation. 8 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative Setting the input condenser TBD Setting the output condenser TBD Setting the external inductor Operating frequency : 2MHz TB62750FTG The circuit operation has the consecutive mode method. The ability of the output current is changed by the constant of the inductor. Soft start function This function is built-in to avoid the over-inserting current and the power drop when the flash mode and the light mode switch. When the condenser (Approximately 3300pF) is connected to the SS terminal, the rising time becomes about 300 s in the flash mode. OVD function OVP voltage: Detecting the over-load at 10.7V(TYP). When the loaded voltage of OVP rises because of the LED opening or something other, this function shutdowns the IC. The operation recovers just after the voltage of OVP falls to 10.7V or less. TSD function MAX 180 MIN 120 9 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) Tentative SOLDERABILITY The following conditions apply to solderability. Solderability (1) Use of Sn-63Pb solder bath TB62750FTG * solder bath temperature = 230C, dipping time = 5 seconds, number of times = once, use of R-type flux (2) Use of Sn-3.0Ag-0.5Cu solder bath CAUTION * Particular care is necessary in the design of the output, VCC, COMMON and GND lines since the IC may be destroyed by short circuits between outputs, air contamination faults, or faults arising from 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 or 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. * Note that the IC may be destroyed as a result of damage to or misconnection of external components. RESTRICTIONS ON PRODUCT USE * The information contained herein is subject to change without notice. 030619EBA * 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. 10 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) |
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