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| TENTATIVE TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic TB62752AFUG TB62752AFUG Step Up Type DC/DC Converter for White LED Features The TB62752AFUG is a high efficient Step-Up Type DC/DC Converter specially designed for constant current driving of White LED. This IC can drive 2-8 white LEDs connected series using a Li-ion battery. This IC contains N-ch MOS-FET Transistor for Coil-Switching, and LED Current (IF) is set with an external resistor. This IC is especially for driving back light white LEDs in LCD of PDA, Cellular Phone, or Handy Terminal Equipment. Characteristics * * * * * * * 2-8 white LEDs connected series (Typ. 7LEDs) Variable LED Current IF is set with a external resistor : 20 mA (Typ.) @RSENS = 15 Output Power : Available for 800mW LED loading Weight: 0.016 g (Typ.) High Efficiency : 80% over (Using recommended external parts: Typ. 7LEDs) Output Over Voltage Shutdown Function : Switching Operation is shut downed when OVD terminal Voltage is over 37 V (typ.). IC Package : SSOP6=p=0.95B Switching Frequency : 1.1 MHz (Typ.) Pin Assignment (Top view) SHDN FB W OVD GND VIN SW Caution 1: This IC could be destroyed in some case if amounted in 180 inverse direction. Please be careful about IC direction in mounting. 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 225 Costa Mesa, California 92626 Toll Free: 800.984.5337 Fax: 714.850.9314 TENTATIVE Block Diagram VIN 22H TB62752AFUG SW OVD VIN OSC PWM Control Over Voltage Detection (1.1MHz) Reference 2.2F Current Limit Error AMP. Shutdown Function 300mV 15 @20mA GND FB 1.0F SHDN Pin Function Pin No. 1 Symbol SHDN Function Description Voltage-Input Terminal for IC-Enable / Disable LED-IF. IF adjustment with PWM input signal is also available. Over Voltage Detection Terminal. 2 3 4 5 6 OVD VIN SW GND FB IC Switching Operation is disabled with detection over voltage. If the voltage returns to detection level or less, Operation is enabled again. Supply Voltage Input Terminal. ( 2.8V to 5.5V) Switch Terminal for DC/DC Converter. Nch MOSFET Built-In. Ground Terminal. LED IF Setting Resister Connecting Terminal. 2 2005-08-5 TENTATIVE Absolute Maximum Ratings (Topr = 25C if without notice) Characteristics Power Supply Voltage Input Voltage Switching Terminal Voltage Switching Terminal Current Power Dissipation Thermal Resistance Operation Temperature Range Storage Temperature Range Maximum Junction Temperature Caution 2: Symbol VIN VSHDN Vo (SW) Io (SW) PD Rth (j-a) Topr Tstg Tj Ratings -0.3 to +6.0 -0.3 to +VIN + 0.3 -0.3 to 40 1500 0.41 (Device) 0.47 (on PCB) Caution 2 300 (Device) 260 (on PCB) -40 to +85 -55 to +150 150 Unit V V V mA W C/W C C C TB62752AFUG Power Dissipation must be calculated with subtraction of 3.8 mW/C from Maximum Rating with every 1C if Topr is upper 25C. (on PCB) Recommended Operating Condition (Ta = -40C to 85C if without notice) Characteristics Power Supply Voltage LED Current (Average Value) Symbol VIN Io1 VIN = 3.6 V, RSENS=15 4LEDs, Topr = 25C Test Circuit Test Condition Min 2.8 Typ 20 Max 5.5 Unit V mA Electrical Characteristics Characteristics Input Voltage Range Operating Consumption Current Quiescent Consumption Current SHDN Terminal 'H' Level Input Voltage SHDN Terminal 'L' Level Input Voltage SHDN Terminal Current Integrated MOS-Tr Switching Frequency Switching Terminal Current Switching Terminal Leak Current FB Terminal Feedback Voltage (VFB) FB Terminal Line Regulation FB Terminal Current OVD terminal Voltage OVD Terminal Leakage Current (Ta = 25C, VIN=2.8V to 5.5V if without notice) Symbol VIN IIN (On) IIN (Off) VSHDNH VSHDNL ISHDN fOSC IoZ (SW) Ioz (SW) VFB VFB IoZ (SW) VOVD IOVDZ VIN=3.6V, RSENS=15 VIN=3.6V,VSHDN=0V VIN=3.6V,VSHDN=3.6V VIN=3.6V,VSHDN=3.6V VIN=3.6V, RSENS=15 Topr=25C, L=22H VIN=3.6V center VIN=3.0 to 5.0V VOVD=30V Test Condition Min 2.8 1.3 0 0.77 285 -5 34.5 Typ TBD 0.5 0 1.1 600 0.5 300 TBD 37 0.5 Max 5.5 1.0 VIN 0.4 1.0 1.43 1 315 5 39.5 1 Unit V mA A V V A MHz mA A mV % A V A 3 2005-08-5 TENTATIVE TB62752AFUG Protection in LED opened condition The operation with OVD terminal is available for the protection in case LED Circuit opened. Please see the example of application circuit. If load of LED is detached, Nch MOS switching operation is disabled with detection of boost circuit voltage. Setting of external Capacitor In case not using PWM signal to SHDN terminal for brightness control, recommended values are C1 = Over 2.2 (F), C2 = Over 1.0 (F) In case with PWM signal to SHDN terminal for brightness control, recommended values are C1 = Over 4.7 (F), C2=Under 0.1 (F) to reduce fluctuation of input current and up accuracy of brightness. The recommended capacitor values depend on the Brightness Control Method. Setting of IO Resistance connects between RSENS pin and GND. The average current is set by this RSENS value and average current are obtained by the following equation. IF[mA] = 300[mV] RSENS [] Current Value error is within 5%. 4 2005-08-5 TENTATIVE Package Dimensions TB62752AFUG Weight : 0.016 g (Typcal) 5 2005-08-5 TENTATIVE TB62752AFUG About solderability, following conditions were confirmed * Solderability (1) Use of Sn-63Pb solder Bath * solder bath temperature = 230C * dipping time = 5 seconds * the number of times = once * use of R-type flux (2) Use of Sn-3.0Ag-0.5Cu solder Bath * solder bath temperature = 245C * dipping time = 5 seconds * the number of times = once * use of R-type flux 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. 6 2005-08-5 |
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