TB62750FTG Tentative 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 :1.8A(Typ.) ・Maximum output power : ・Maximum output voltage :10V ・Operating frequency :2MHz （ＶQON24-0404-0.65） ・Four operating modes Light mode :ILED=350mA(Typ.) (R3=8.2kΩ,R2=62kΩ) Flash mode :ILED=800mA(Typ.) (RSENS=0.375Ω) Weight： 0.09g 現品表示 ； (Typ.) Shutdown mode :Icc=0.01µA(Typ.) ・High efficiency :Maximum efficiency : 80%(In the flash mode) Application VIN(3.0～4.2) L S-Di Cin Cout VIN OVP SW1SW2 SW3 K1 K2 K3 EN2 RSENS1 EN1 RSENS2 RSENS3 SS FB+ Css PGND1 PGND3 GND PGND2 800mA (TYP) IL R3 R4 FB- 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: [email protected] California Sales Office: 950 South Coast Drive, Suite 265 Costa Mesa, California 92626 Toll Free: 800.984.5337 Fax: 714.850.9314 TB62750FTG Tentative ■Pin Assignment (top view) SW1 PGND1 SW2 PGND2 SW3 PGND3 18 17 16 15 14 13 OVP 19 12 SS EN2 20 11 IL EN1 21 10 NC AGND 22 9 NC VIN 23 8 FB- NC 24 7 FB+ 1 2 3 4 5 6 K3 RSENS3 K2 RSENS2 K1 RSENS1 2 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) TB62750FTG Tentative ■ Block Diagram L S-Di VIN OVP Cin VIN EN2 EN1 IL R2 SS Css 14 16 18 Cout 19 SW1 SW3 SW2 23 20 21 K1 5 K2 3 K3 1 11 RSENS2 FB+ FB- 12 AGND 22 8 17 15 13 PGND1 PGND2 PGND3 RSENS1 7 6 R3 3 RSENS3 4 2 R1 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) TB62750FTG Tentative ■ Explanation of the Terminal No. Symbol Function 1 K3 2 RSENS3 3 K2 4 RSENS2 5 K1 6 RSENS1 7 FB+ Detecting the voltage of the current-setting resistor: R1 for the flash. It can change 8 FB- the light-mode-current with the resistor: R3 which is connected to FB+. 9 NC No Connect 10 NC No Connect 11 IL 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. 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. 12 SS Setting the constant to limit the current when DC-DC operation starts. The rising time is changed depending on the constant of the condenser. 13 PGND3 14 SW3 15 PGND2 16 SW2 17 PGND1 18 SW1 Switching the DC-DC converter. Nch MOSFET is built-in. 19 OVP Detecting the over-voltage. 20 EN2 Inputting the logic signals which set the modes. 21 EN1 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. "ON" :Flash mode "OFF" :Lighting mode Inputting the logic signals which set the modes. "ON" :DC-DC operation "OFF" :Stop 22 AGND Ground terminal for analog. 23 VIN Inputting the power supply voltage to the IC. The operating voltage is 2.8 to 5.5V. 24 NC No Connect 4 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) TB62750FTG Tentative ■ Absolute Maximum Ratings (Topr = 25°C if not specified) Characteristics Symbol Ratings Unit Power supply voltage VCC - 0.3 ～ 6.0 V Input voltage Vin - 0.3 ～ VIN + 0.3 V Switching terminal voltage Vo(SW) - 0.3 ～ 12 V Output current Iout 1000 mA Operating temperature range Topr - 40 ～ 85 °C Storage temperature Tstg - 55 ～ 150 °C ■ Recommended Operating Condition (Topr = −40 to 85°C if not specified) Characteristics Power supply voltage Logic HIGH Input LOW Voltage Constant-current output Symbol Test Conditions Min. Typ. Max. Unit VIN - 2.8 - 5.5 V 0.7XVIN - VIN +0.15 -0.15 - 0.3X VIN VIH VIL EN1,EN2 V Iout - - 800 1000 mA R1 R2 R3 - 51 - 0.375 62 8.2 75 - Ω kΩ kΩ Input condenser Cin - - 20 - µF Output condenser Cout - - 10 - µF Condenser for soft start Css - 2200 3300 10000 pF External inductor L - - 3.9 - µH ISET Resistor Flash mode Light mode 5 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) TB62750FTG Tentative ■ Electrical Characteristics (Topr = −40~85°C VCC = 2.8~5.5 V if not specified.) Characteristics of DC-DC regulator. (Topr = - 40～85°C, VIN = 2.8～5.5V if not specified) Characteristics Symbol Test Conditions Min. Typ. Max. Unit Power supply voltage VIN - 2.8 - 5.5 V - TBD - mA - 0.01 0.5 µA EN1=”H”, EN2=”L” Operating consumption current IIN(On) Vin=3.6V, R2=62kΩ R3=8.2kΩ, R1=0.375Ω EN1=”L”, EN2=”L” Quiescent consumption current IIN(Off) Input current IINEN1 IINEN2 Vin=3.6V - - 0.5 µA 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 Ioz(SW) - - 0.5 1 µA 285 300 315 mV TBD 130 TBD mV - 2 - % - 10.7 - V 120 157 180 ℃ (Logic input terminal) Integrated MOS-Tr switching frequency Switching terminal leakage current Vin=3.6V EN1=”H”, EN2=”H” Vin=3.6V, R1=0.375Ω Topr=25℃ FB terminal feedback voltage VFB EN1=”H”, EN2=”L” Vin=3.6V, R1=0.375Ω R2 = 62kΩ,R3 =8.2kΩ Topr=25℃ FB terminal line regulation ΔVFB OVD voltage (OVD terminal) VOVD Vin=3.6V (typ.) Vin=3.0～4.2V - TSD 6 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) TB62750FTG Tentative Characteristics of constant-current of SINK(Topr = 25°C, Vcc = 3.6V if not specified.) Characteristics ISET output current (Light mode) ISET output voltage (Light mode) Lighting time in flash mode Symbol Test Conditions Min. Typ. Max. Unit ISET EN1 = “H” EN2 = “L” R2= 62kΩ, R3= 8.2kΩ R1 = 0.375Ω - 20 - µA VISET EN1 = “H” EN2 = “L” R2= 62kΩ - TBD - V Tolerance time under EN2 = “H” and EN1 = “H”. R1 = 0.375Ω - 100 300 ms t FLASH 7 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11) TB62750FTG Tentative ■ Explanation of operation 【Setting the operating mode】 1.Selecting the four modes shown below with logic input terminals: EN1 and EN2. EN1 EN2 MODE L L L H H L Light mode H H Flash mode Shutdown 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(Ω) 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 - 1.2V（Internal Vref）X Iout（mA）＝ R3 R2 R1 The current value of IL is recommended at about 20μA. Set R2 at 51kΩ to 75kΩ. When R3 is set at 0Ω, 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) TB62750FTG Tentative 【Setting the input condenser】 TBD 【Setting the output condenser】 TBD 【Setting the external inductor】 Operating frequency : 2MHz 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 300μ 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 TB62750FTG SOLDERABILITY The following conditions apply to solderability. ● Solderability (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 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 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. 10 28-Apr-05 (Rev0.2) TB627350FTG (Page. /11)