TB62736FUG TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic TB62736FUG Step-up Type DC-DC Converter for White LEDs The TB62736FUG is a high efficiency step-up type DC/DC converter that is designed especially for use as a constant current driver of white LEDs. It is possible to drive 2 - 6 white LEDs connected in series using a lithium-ion battery. (Typ. 4 White LEDs) This IC incorporates an N-ch-MOS transistor required for switching of an external inductor. The forward current of the LEDs can be controlled by an external resistor. An analog voltage input and a pulse input system (PWM) can be used as a brightness control function. The switching frequency is fixed at around 1.1 MHz. This IC is best suited for use as a driver of white LED back lighting in color LCDs in PDAs, cellular phones and handy terminal devices. Weight: 0.016 g (typ.) Features • Brightness control function : LED forward current 25~100% • Maximum output voltage : over 24V • LED current values controlled by external resistance • Output power : 20mA (typ.) @ RSENS=16Ω : 400 mW • Package : SSOP6-P-0.95 (SOT23-6) • High efficiency : maximum 87% (when used with components as recommended herein) • Thermal Shutdown Function incorporated : 150 degree (typ.) Pin Assignment (top view) SHDN VIN M (NC) FB GND SW Note 1: The IC may break if mounted 180 degrees in reverse. Ensure the device is correctly orientated before assembley. Note 2: The control pin must be set to a certain logic level, as unstable output could result if the pin is left open.. Note 3: Regarding soldering, the following conditions were confirmed (1) Use of Sn-63Pd 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 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 TB62736FUG Block Diagram 4 SW 2 NC 3 VIN Off Time Control Mono Multi Reference Mono Multi CTL AMP. Level Detect 6 Error AMP. CTL AMP. 1 SHDN GND 5 Pin Functions No. Symbol Function Input pin for IC ON/OFF control and variable LED IF. 0 to 0.5V : Shutdown Mode (IC shutdown) 1.0V to 2.5V : IF = 25 to 100% Variable (Linear Control) Over 2.5V : IF = 100% PWM signal input for IF control (see p.5) 1 SHDN 2 NC No Connection or Connected to GND 3 VIN Supply voltage pin. Supply voltage range : 2.8V to 5.5V 4 SW DC-DC converter switching pin – switch incorporates N-ch MOSFET 5 GND 6 FB Ground pin Connected to the cathode of LED Note: The NC terminal is not connected to the internal circuit. 2 2004-10-29 TB62736FUG Absolute Maximum Ratings (Topr = 25°C, unless otherwise specified) Characteristics Symbol Ratings Unit Power supply voltage VIN −0.3 to 6.0 V Input voltage Vin −0.3 to VCC + 0.3 V Switching pin voltage VO (SW) −0.3 to 24 V Switching pin current IO (SW) 380 mA 0.41 (IC only) Power Dissipation PD 0.47 (IC mounted on PCB) (Note) W Rth (j-a) 1 300 (IC only) Rth (j-a) 2 260 (IC mounted on PCB) °C/W Operating temperature range Topr −40 to 85 °C Storage temperature Tstg −40 to 150 °C Tj 125 °C Thermal resistance Maximum junction temperature Note: Power dissipation is reduced by 3.8mW/°C from the maximum rating for every 1°C exceeding the ambient temperature of 25°C (when the IC is mounted on a PCB). Recommended Operating Condition (Topr = −40 to 85°C, unless otherwise specified) Characteristics Power supply voltage Symbol Test Conditions Min. Typ. Max. Unit VIN ⎯ 2.8 ⎯ 5.5 V SHDN pin H level input voltage VSHDN (H) ⎯ 2.7 ⎯ VIN V SHDN pin L level input voltage VSHDN (L) ⎯ 0 ⎯ 0.5 V SHDN pin input pulse width tpw ON/OFF duty width 33 ⎯ ⎯ µs LED current (Average value) IO1 ⎯ 20 ⎯ ｍA VIN = 3.6 V, RSENS = 16 Ω 4LEDs, Topr = 25°C Electrical Characteristics (Topr = −40~85°C VCC = 2.8~5.5 V, unless otherwise specified) Characteristics Symbol Test Conditions Min. Typ. Max. Unit Operating consumption current IIN (ON) Standby consumption current IIN (OFF) VIN = 6.0 V, RSENS = 16 Ω ⎯ 0.9 1.5 mA VIN = 3.6 V, VSHDN = 0 V ⎯ 0.5 1.0 µA ISHDN VIN = 3.6 V, VSHDN = 3.6 V −10 0 10 µA Integrated MOS-FET switching frequency fOSC VIN = 3.6 V, VSHDN = 3.6 V 0.77 1.1 1.43 MHz Switching pin protection voltage VO (SW) ⎯ ⎯ 25 ⎯ V Switching pin current IO (SW) ⎯ ⎯ 400 ⎯ mA Switching pin leakage current IOZ (SW) ⎯ ⎯ 0.5 1 µA 308 325 342 mV −5 ⎯ 5 % SHDN pin current FB pin feedback voltage FB pin line regulation VFB VIN = 3.6 V, RSENS = 16 Ω Topr = 25°C, L = 4.7µH VIN = 3.6 V center VIN = 3.0V to 5.0V ∆VFB 3 2004-10-29 TB62736FUG Application Circuit Example VIN 4.7-10µH 4 SW 2 NC 3 VIN Off Time Control Mono Multi Reference Mono Multi Vz=24V CTL AMP. 2.2µF 1µF Level Detect 500Ω Error AMP. 1.0-2.5V Analog FB 16Ω @20mA CTL AMP. 1 PWM 6 SHDN GND 5 Protection at the time of LED opening The zener diode in the application circuit example is necessary for the provision of over-voltage protection for when the LED becomes open. As the IC does not incorporate a voltage protection circuit, it is strongly advised that a zener diode be connected. The zener diode should satisfy the following conditions: i) Less than maximum output voltage of 24V ii) Greater than the total series LED VF iii) Less than the maximum output capacitance C2. Moreover, by connecting a protection circuit such as R_ZD in the figure below, it is possible to control the output current when the LED becomes open, and to use a zener diode of lower tolerance. An example of IZD control by R_ZD connection. (RSENS = 16 Ω) S-Di R_DZ (Ω) IZD (mA) 500 0.6 100 1.0 SW IZD 1 µF C2 IF R_ZD GND FB In order to avoid adverse effects on driver characteristics, RSENS Toshiba recommends a resistance of 500 ohms or less. Protection circuit application 4 2004-10-29 TB62736FUG Output-side Capacitor Setting It is recommended that the value of C2 be equal to, or greater than 1.0 (µF). External Inductor Size Setting For each number of LEDs, the selected inductance should be greater than the value indicated in the table below. Number of LEDs Inductance (Unit: µH) 2 4.7 3 6.8 IF = 20 mA 4 5 Note 10 6 Control of IF The resistance RSENS is connected between the FB pin and the GND pin. The average current is controlled by the RSENS value, and calculated using the following equation: IF (mA) = [ 325mV / RSENS(Ω) ] Margin of error is ±5%. Current control using SHDN pin This IC can carry out variable of the IF current by external resistance Variable range : 30 to 100% SHDN Voltage VSHDN=0V~0.5V VSHDN=1V~2.5V VSHDN>2.5V Note Io Valuable Rate 0 25 - 100 100 UNIT : % SHDN input - output rate/output current VIN=3.0V 25 80 20 60 15 40 10 IF rate 20 IF(mA) IF rate (%) 100 5 IF 0 0 1.0 1.3 1.6 1.9 VSHDN(V) 2.2 2.5 Dimming using PWM signal input A dimming function can also by applied using a PWM signal. [Notes] ▪When using a PWM signal, the minimum pulse width of the PWM should be greater than 33µs. ▪Duty ratio of PWM function should be set at 10% - 90%. ▪The recommended PWM frequency should be 100Hz - 10kHz. <<Output current is calculated using the following equation>> IF(mA) = 325[mV] × ON Duty [%] RSENS [Ω] 5 2004-10-29 TB62736FUG I/O Equivalent Pin Circuits 1. SHDN pin 2. NC pin VIN 50k SHDN NC 1 2 The NC pin is not connected to any internal circuit. 3. SW pin SW 4. FB pin 4 VIN 1k FB 6 20k 5k 20k 6 2004-10-29 TB62736FUG 1. Application Circuit Example and Measurement Data (Reference data) S-Di SW 2~6 WLEDs SHDN RSENS = 1.6 Ω FB • Evaluation conditions L : CXLD120 series (NEO MAX CO.,Ltd.) (Size 2.5 × 3.0 × 1.2 mm) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) LED : NSCW215T (NICHIA Corp.) C1 : C2012JB1E105K (TDK Corp.) C2 : C2012JB1E105K (TDK Corp.) GND Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH 35 100 35 100 30 90 30 90 25 80 25 80 70 IOUT Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IOUT(mA) 20 Efficiency(%) IOUT(mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH 70 20 60 15 50 10 5.5 IOUT Efficiency 50 2.8 3.1 3.4 3.7 VIN(V) 4.3 4.6 4.9 5.2 5.5 Input Voltage - Efficiency/Output Current 6LED Drive, L=10µH 35 100 35 100 30 90 30 90 25 80 25 80 70 IOUT Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IOUT(mA) 20 Efficiency(%) IOUT(mA) 4 VIN(V) Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH 70 20 60 15 50 10 IOUT Efficiency 3.1 30 90 25 80 20 70 IOUT Efficiency 15 60 50 10 3.7 4 4.3 VIN(V) 4 4.3 4.6 4.9 5.2 5.5 Efficiency in the range of VIN = 2.8 to 5.5 V Average Efficiency Efficiency (%) (%) Efficiency(%) 100 3.4 3.7 <Measurement Data> 35 3.1 3.4 VIN(V) Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH 2.8 60 50 2.8 5.5 VIN(V) IOUT(mA) 60 Efficiency(%) C1 = 2.2 µF VCC Efficiency(%) L1 C2 = 1.0 µF VIN = 2.8~5.5 V 4.6 4.9 5.2 5.5 2 LED 82.60 to 88.46 86.29 3 LED 82.69 to 87.78 85.95 4 LED 80.73 to 86.22 83.05 5 LED 80.73 to 87.28 83.45 6 LED 79.78 to 85.55 81.15 Output current in the range of VIN = 3.0 to 5.0 V Tolerance (%) Output Current (mA) VIN = 3.6 V center MIN MAX 7 2 LED 21.13 -3.50 1.77 3 LED 20.60 -1.95 1.38 4 LED 20.87 -1.75 1.11 5 LED 20.06 -1.81 1.15 6 LED 19.90 -1.95 1.28 2004-10-29 TB62736FUG 2. Application Circuit Example and Measurement Data (Reference data) S-Di L1 C1 = 2.2 µF VCC SW 2~6 WLEDs SHDN RSENS = 1.6 Ω FB • Evaluation conditions L : 1001AS series (TOKO, INC) (Size 3.6 × 3.6 × 1.2 mm) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) LED : NSCW215T (NICHIA Corp.) C1 : C2012JB1E105K (TDK Corp.) C2 : C2012JB1E105K (TDK Corp.) C2 = 1.0 µF VIN = 2.8~5.5 V GND Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH 100 35 100 30 90 30 90 25 80 25 80 Efficiency IOUT 15 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 IOUT(mA) 70 20 70 20 60 15 50 10 IOUT Efficiency 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 Input Voltage - Efficiency/Output Current 6LED Drive, L=10µH 100 35 100 30 90 30 90 25 80 25 80 20 70 IOUT Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IOUT(mA) 70 20 60 15 50 10 5.5 IOUT Efficiency 3.1 100 30 90 25 80 70 20 IOUT Efficiency 60 50 10 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 Efficiency in the range of VIN = 2.8 to 5.5 V Average Efficiency Efficiency (%) (%) Efficiency(%) 35 3.1 3.4 <Measurement Data> Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH 2.8 60 50 2.8 VIN(V) 15 Efficiency(%) 35 Efficiency(%) IOUT(mA) 60 50 5.5 Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH IOUT(mA) Efficiency(%) 35 Efficiency(%) IOUT(mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH 5.2 5.5 2 LED 83.10 to 88.60 86.55 3 LED 81.32 to 86.47 84.54 4 LED 79.15 to 84.63 81.30 5 LED 79.72 to 86.39 82.87 6 LED 78.91 to 85.10 80.47 Output current in the range of VIN = 3.0 to 5.0 V Tolerance (%) Output Current (mA) VIN = 3.6 V center MIN MAX 8 2 LED 21.17 -3.32 1.73 3 LED 20.85 -1.95 1.38 4 LED 20.56 -1.79 1.15 5 LED 20.10 -1.82 1.22 6 LED 19.95 -1.94 1.26 2004-10-29 TB62736FUG 3. Application Circuit Example and Measurement Data (Reference data) S-Di SW 2~6 WLEDs SHDN • Evaluation conditions L : LQH2M series (Murata Manufacturing Co.,Ltd.) (Size 2.0 × 1.6 × 0.95 mm) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) LED : NSCW215T (NICHIA Corp.) C1 : C2012JB1E105K (TDK Corp.) C2 : C2012JB1E105K (TDK Corp.) RSENS = 1.6 Ω FB GND Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH 100 35 100 30 90 30 90 25 80 25 80 20 70 70 Efficiency IOUT 15 10 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 60 15 50 10 5.5 IOUT Efficiency 60 50 2.8 VIN(V) 4 4.3 VIN(V) Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH Input Voltage - Efficiency/Output Current 6LED Drive, L=10µH 3.1 3.4 3.7 4.6 4.9 5.2 5.5 35 100 35 100 30 90 30 90 25 80 25 80 70 20 IOUT Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IOUT(mA) IOUT(mA) 2.8 IOUT(mA) 20 Efficiency(%) 35 Efficiency(%) IOUT(mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH 70 20 60 15 50 10 5.5 Efficiency(%) C1 = 2.2 µF VCC IOUT Efficiency Efficiency(%) L1 C2 = 1.0 µF VIN = 2.8~5.5 V 60 50 2.8 3.1 VIN(V) 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 <Measurement Data> 35 100 30 90 25 80 20 70 IOUT Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 Efficiency in the range of VIN = 2.8 to 5.5 V Average Efficiency Efficiency (%) (%) Efficiency(%) IOUT(mA) Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH 2 LED 82.37 to 88.70 86.38 3 LED 80.19 to 86.55 84.12 4 LED 78.11 to 84.54 80.16 60 5 LED 74.79 to 84.94 79.94 50 6 LED 74.14 to 83.47 77.17 5.5 Output current in the range of VIN = 3.0 to 5.0 V Tolerance (%) Output Current (mA) VIN = 3.6 V center MIN MAX 9 2 LED 21.19 -3.26 1.69 3 LED 20.90 -1.87 2.17 4 LED 20.63 -1.78 1.01 5 LED 20.09 -1.88 1.25 6 LED 19.93 -1.99 1.07 2004-10-29 TB62736FUG 4. Application Circuit Example and Measurement Data (Reference data) S-Di L1 SW 2~6 WLEDs SHDN RSENS = 1.6 Ω FB • Evaluation conditions L : VLF3010A series (TDK Corp.) (Size 3.0 × 3.0 × 1.0 mm) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) LED : NSCW215T (NICHIA Corp.) C1 : C2012JB1E105K (TDK Corp.) C2 : C2012JB1E105K (TDK Corp.) GND 100 35 100 30 90 30 90 25 80 25 80 70 20 Efficiency IOUT 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IOUT(mA) 35 70 20 60 15 50 10 5.5 IOUT Efficiency 3.1 3.4 3.7 4.3 4.6 4.9 5.2 5.5 Input Voltage - Efficiency/Output Current 6LED Drive, L=10µH 100 30 90 30 90 25 80 25 80 70 20 IOUT Efficiency 15 10 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IOUT(mA) 35 Efficiency(%) 100 35 IOUT(mA) 4 VIN(V) Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH 60 15 50 10 5.5 70 20 IOUT Efficiency 3.1 30 90 25 80 20 70 IOUT Efficiency 15 10 3.7 4 4.3 4 4.3 4.6 4.9 5.2 5.5 4.6 4.9 5.2 Efficiency in the range of VIN = 2.8 to 5.5 V Average Efficiency Efficiency (%) (%) Efficiency(%) 100 3.4 3.7 <Measurement Data> 35 3.1 3.4 VIN(V) Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH 2.8 60 50 2.8 VIN(V) IOUT(mA) 60 50 2.8 VIN(V) 2.8 Efficiency(%) Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH Efficiency(%) IOUT(mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH Efficiency(%) C1 = 2.2 µF VCC C2 = 1.0 µF VIN = 2.8~5.5 V 2 LED 79.85～86.97 84.02 3 LED 80.19～85.32 83.39 60 4 LED 78.77～83.60 80.69 50 5 LED 79.72～86.39 82.87 6 LED 78.91～85.10 80.49 5.5 VIN(V) Output current in the range of VIN = 3.0 to 5.0 V Tolerance (%) Output Current (mA) VIN = 3.6 V center MIN MAX 10 2 LED 21.19 -3.08 1.67 3 LED 20.89 -1.86 1.33 4 LED 20.64 -1.68 1.11 5 LED 20.10 -1.82 1.22 6 LED 19.95 -1.94 1.26 2004-10-29 TB62736FUG 5. Application Circuit Example and Measurement Data (Reference data) S-Di L1 C1 = 2.2 µF VCC SW 2~3 WLEDs SHDN RSENS = 1.6 Ω FB • Evaluation conditions L : 32R51 (KOA Corp.) (Size 3.2 × 2.5 × 0.6 mm) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) LED : NSCW215T (NICHIA Corp.) C1 : C2012JB1E105K (TDK Corp.) C2 : C2012JB1E105K (TDK Corp.) C2 = 1.0 µF VIN = 2.8~5.5 V GND 35 100 30 90 25 80 20 70 IOUT Efficiency 15 Efficiency(%) IOUT(mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=5.1µH 60 10 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 35 100 30 90 25 80 70 20 IOUT Efficiency 15 Efficiency(%) IOUT(mA) Input Voltage - Efficiency/Output Current 3LED Drive, L=5.1µH 60 50 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 <Measurement Data> Efficiency in the range of VIN = 2.8 to 5.5 V Average Efficiency Efficiency (%) (%) 2 LED 81.78～88.79 85.84 3 LED 76.84～85.48 82.17 Output current in the range of VIN = 3.0 to 5.0 V Tolerance (%) Output Current (mA) VIN = 3.6 V center MIN MAX 2 LED 21.19 -2.99 1.64 3 LED 20.71 -1.98 1.44 11 2004-10-29 TB62736FUG Package Dimensions Weight: 0.016 g (typ.) 12 2004-10-29 TB62736FUG 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. 13 2004-10-29