TB62756FUG TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic TB62756FUG Step-up Type DC/DC Converter for White LEDs The TB62756FUG 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. This IC incorporates an N-ch-MOS transistor requiredfor switching of an external inductor. The forward current of the LEDs can be controlled by an external resistor. A pulse input system (PWM) can be used as a brightness control function. 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. This device is Pb-free product. Weight: 0.016 g (typ.) Features • Can drive 2-6 white LEDs connected series • Variable LED Current IF is set with a external resistor : 20 mA (Typ.) @RSENS = 16 Ω • Output Power : Available for 400mW LED loading • High Efficiency : 87% @Maximum (Using recommended external parts: Typ. 4LEDs) • IC Package : SSOP6-P-0.95 (SOT23-6) • Switching Frequency : 1.1 MHz (Typ.) 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 225 Costa Mesa, California 92626 Toll Free: 800.984.5337 Fax: 714.850.9314 TB62756FUG Block Diagram 4 SW 2 NC VIN 3 Monostable multivibrator for reference Monostable multivibrator for off time control CTL AMP. Circuit on/off 6 Error AMP. FB SHDN 1 5 GND Pin Assignment (top view) 6 FB SHDN 1 Q (NC) 2 VIN 3 Note 1: 5 GND 4 SW The IC may break if mounted 180 degrees in reverse. Ensure the device is correctly orientated before assembley. Pin Functions No. Symbol Function Input pin for IC ON/OFF control and variable LED IF. SHDN=H → Operation Mode、SHDN=L → Shutdown Mode (IC shutdown) 1 SHDN PWM signal input for IF control (see p.5) This pin must be set to a certain logic level, as unstable output could result if the pin is left open. 2 NC No Connection or Connected to GND. (Note 2) 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 Note 2: Ground pin. Connected to the cathode of LED. The NC terminal is not connected to the internal circuit. 2 2005-11-8 TB62756FUG I/O Equivalent Pin Circuits 1. SHDN pin 2. NC pin VIN SHDN NC 1 2 The NC pin is not connected to any internal circuit. 3. SW pin SW 4. FB pin 4 VIN FB 3 6 2005-11-8 TB62756FUG Application Circuit Example VIN 4.7-10µH 4 VIN SW 2 NC 3 Monostable multivibrator for reference Monostable multivibrator for off time control Vz=24V CTL AMP. 2.2µF 1µF 500Ω Circuit on/off SHDN 6 Error AMP. FB 16Ω @20mA 1 PWM 5 GND 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 (Typ.) 100 2.8 (Typ.) SW IZD IF 1 µF C2 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 2005-11-8 TB62756FUG 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 4 5 Note IF = 20 mA 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%. 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 2005-11-8 TB62756FUG Absolute Maximum Ratings (Ta = 25°C, unless otherwise specified) Characteristics Symbol Ratings Unit VIN −0.3 to 6.0 V Input voltage VSHDN −0.3 to VIN + 0.3(Note3) V Switching pin voltage VO (SW) −0.3 to 24 V Switching pin current IO (SW) 380 mA Power supply voltage Power Dissipation PD 0.41 (IC only) 0.47 (IC mounted on PCB)(Note4) W Rth (j-a) 1 300 (IC only) Rth (j-a) 2 260 (IC mounted on PCB) Operating temperature range Topr −40 to 85 °C Storage temperature Tstg −55 to 150 °C Tj 150 °C Thermal resistance Maximum junction temperature °C/W Note3: However, do not exceed 6V. Note4: 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 (Ta = −40 to 85°C, unless otherwise specified) Characteristics Symbol Test Conditions Min. Typ. Max. Unit Power supply voltage VIN ⎯ 2.8 ⎯ 5.5 V SHDN pin input pulse width tpw ON/OFF duty width 33 ⎯ ⎯ µs LED current (Average value) IF1 ⎯ 20 ⎯ ｍA VIN = 3.6 V, RSENS = 16 Ω 4LEDs, Ta = 25°C Electrical Characteristics (Ta = 25°C VIN = 2.8~5.5 V, unless otherwise specified) Characteristics Symbol Test Conditions Min. Typ. Max. Unit Operating consumption current IIN (ON) VIN = 6.0 V, RSENS = 16 Ω ⎯ 0.9 1.5 mA Standby consumption current IIN (OFF) VIN = 3.6 V, VSHDN = 0 V ⎯ 0.5 1.0 µA SHDN pin H level input voltage VSHDN (H) ⎯ 1.3 ⎯ VIN V SHDN pin L level input voltage VSHDN (L) ⎯ 0 ⎯ 0.4 V SHDN pin current 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 % FB pin feedback voltage FB pin line regulation VFB VIN = 3.6 V, RSENS = 16 Ω L = 4.7µH VIN = 3.6 V center VIN = 3.0V to 5.0V ∆VFB 6 2005-11-8 TB62756FUG 1. Application Circuit Example and Measurement Data (reference data) VIN = 2.8 to 5.5 V L1 S-Di • Evaluation conditions (Ta = 25°C) SW WLEDs 2 to 6 SHDN FB RSENS = 16 Ω GND L1 C2 = 1.0 µF 100 35 100 30 90 30 90 25 80 25 80 70 20 IIOUT F Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IF (mA) IOUT(mA) 35 70 20 60 15 50 10 5.5 IIOUT F Efficiency 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH Input Voltage - Efficiency/Output Current 6LED Drive, L=10µH 100 35 100 30 90 30 90 25 80 70 20 IIOUT F Efficiency 15 10 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IOUT(mA) IF (mA) 35 Efficiency(%) IF (mA) IOUT(mA) 60 50 2.8 VIN(V) 2.8 Efficiency(%) Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH Efficiency(%) IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH : CXLD120 series (NEO MAX CO.,Ltd.) (Size: 2.5 mm × 3.0 mm × 1.2 mm) : C2012JB1E225K (TDK Corp.) C1 C2 : C2012JB1E105K (TDK Corp.) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) WLEDs : NSCW215T (NICHIA Corp.) RSENS : RK73B1ETBK (KOA Corp.) 80 25 70 20 60 15 50 10 IIOUT F Efficiency 60 50 2.8 5.5 Efficiency(%) C1 = 2.2 µF VIN 3.1 3.4 3.7 4 VIN(V) 4.3 4.6 4.9 5.2 5.5 VIN(V) <Measurement Data> Efficiency in the range of VIN = 2.8 to 5.5 V 35 100 30 90 25 80 70 20 IIOUT F Efficiency 15 60 50 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs Efficiency(%) IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH Efficiency (%) Average Efficiency (%) 82.60 to 88.46 82.69 to 87.78 80.73 to 86.22 80.73 to 87.28 79.78 to 85.55 86.29 85.95 83.05 83.45 81.15 Output current in the range of VIN = 3.0 to 5.0 V (VIN = 3.6 V typ.) 5.5 Output Current (mA) VIN = 3.6 V 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 21.13 20.60 20.87 20.06 19.90 Tolerance (%) Min Max −3.50 −1.95 −1.75 −1.81 −1.95 1.77 1.38 1.11 1.15 1.28 Note: These application examples are provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design. 7 2005-11-8 TB62756FUG 2. Application Circuit Example and Measurement Data (reference data) VIN = 2.8 to 5.5 V L1 S-Di • Evaluation conditions (Ta = 25°C) SW WLEDs 2 to 6 SHDN FB : 1001AS series (TOKO, INC) (Size: 3.6 mm × 3.6 mm × 1.2 mm) : C2012JB1E225K (TDK Corp.) C1 C2 : C2012JB1E105K (TDK Corp.) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) WLEDs : NSCW215T (NICHIA Corp.) RSENS : RK73B1ETBK (KOA Corp.) RSENS = 16 Ω GND L1 C2 = 1.0 µF 100 35 100 30 90 30 90 25 80 25 80 70 20 IIOUT F Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 IF (mA) IOUT(mA) 35 70 20 60 15 50 10 5.5 IIOUT F Efficiency 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 70 20 IIOUT F Efficiency 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IF (mA) IOUT(mA) 35 Efficiency(%) IF (mA) IOUT(mA) 60 50 2.8 Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH 15 Efficiency(%) Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH Efficiency(%) IOUT(mA) IF (mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH 60 15 50 10 5.5 IOUT IF Efficiency Efficiency(%) C1 = 2.2 µF VIN 60 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) VIN(V) 4.6 4.9 5.2 5.5 <Measurement Data> Efficiency in the range of VIN = 2.8 to 5.5 V 35 100 30 90 25 80 20 70 IIOUT F Efficiency 15 60 50 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs Efficiency(%) IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH Efficiency (%) Average Efficiency (%) 83.10 to 88.60 81.32 to 86.47 79.15 to 84.63 79.72 to 86.39 78.91 to 85.10 86.55 84.54 81.30 82.87 80.47 Output current in the range of VIN = 3.0 to 5.0 V (VIN = 3.6 V typ.) 5.5 Output Current (mA) VIN = 3.6 V 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 21.17 20.85 20.56 20.10 19.95 Tolerance (%) Min Max −3.32 −1.95 −1.79 −1.82 −1.94 1.73 1.38 1.15 1.22 1.26 Note: These application examples are provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design. 8 2005-11-8 TB62756FUG 3. Application Circuit Example and Measurement Data (reference data) VIN = 2.8 to 5.5 V L1 S-Di • Evaluation conditions (Ta = 25°C) SW WLEDs 2 to 6 SHDN FB : LQH2M series (Murata Manufacturing Co.,Ltd.) (Size: 2.0 mm × 1.6 mm × 0.95 mm) C1 : C2012JB1E105K (TDK Corp.) C2 : C2012JB1E105K (TDK Corp.) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) WLEDs : NSCW215T (NICHIA Corp.) RSENS : RK73B1ETBK (KOA Corp.) RSENS = 16 Ω GND L1 C2 = 1.0 µF 100 35 100 30 90 30 90 25 80 25 80 20 70 IF IOUT Efficiency Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 IF (mA) IOUT(mA) 35 20 60 15 50 10 5.5 70 IF IOUT Efficiency 3.1 3.4 3.7 4 4.3 VIN(V) 100 30 90 25 80 70 20 IF IOUT Efficiency 10 3.4 3.7 4 4.3 4.6 4.9 5.2 IF (mA) IOUT(mA) 35 3.1 4.6 4.9 5.2 5.5 Input Voltage - Efficiency/Output Current 6LED Drive, L=10µH Efficiency(%) IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH 2.8 60 50 2.8 VIN(V) 15 Efficiency(%) Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH Efficiency(%) IOUT(mA) IF (mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH 35 100 30 90 25 80 20 60 15 50 10 5.5 70 IOUT IF Efficiency Efficiency(%) C1 = 2.2 µF VIN 60 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) VIN(V) 4.6 4.9 5.2 5.5 <Measurement Data> Efficiency in the range of VIN = 2.8 to 5.5 V 35 100 30 90 25 80 20 70 IOUT IF Efficiency 15 60 10 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs Efficiency(%) IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH Efficiency (%) Average Efficiency (%) 82.37 to 88.70 80.19 to 86.55 78.11 to 84.54 74.79 to 84.94 74.14 to 83.47 86.38 84.12 80.16 79.94 77.17 Output current in the range of VIN = 3.0 to 5.0 V (VIN = 3.6 V typ.) 5.5 Output Current (mA) VIN = 3.6 V 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 21.19 20.90 20.63 20.09 19.93 Tolerance (%) Min Max −3.26 −1.87 −1.78 −1.88 −1.99 1.69 2.17 1.01 1.25 1.07 Note: These application examples are provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design. 9 2005-11-8 TB62756FUG 4. Application Circuit Example and Measurement Data (reference data) VIN = 2.8 to 5.5 V L1 S-Di • Evaluation conditions (Ta = 25°C) SW WLEDs 2 to 6 SHDN FB : VLF3010A series (TDK Corp.) (Size: 3.0 mm × 3.0 mm × 1.0 mm) : C2012JB1E225K (TDK Corp.) C1 C2 : C2012JB1E105K (TDK Corp.) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) WLEDs : NSCW215T (NICHIA Corp.) RSENS : RK73B1ETBK (KOA Corp.) RSENS = 16 Ω GND L1 C2 = 1.0 µF 100 30 90 25 80 70 20 IOUT IF Efficiency 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 35 100 30 90 25 80 70 20 60 15 50 10 5.5 IF IOUT Efficiency 3.1 3.4 3.7 4 90 25 80 70 20 IOUT IF Efficiency 15 10 4 4.3 4.6 4.9 5.2 IF (mA) IOUT(mA) 30 Efficiency(%) IF (mA) IOUT(mA) 100 3.7 4.6 4.9 5.2 5.5 Input Voltage - Efficiency/Output Current 6LED Drive, L=10µH 35 3.4 4.3 VIN(V) Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8µH 3.1 60 50 2.8 VIN(V) 2.8 Efficiency(%) 35 IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 5LED Drive, L=10µH Efficiency(%) IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7µH 35 100 30 90 25 80 20 60 15 50 10 5.5 70 IOUT IF Efficiency Efficiency(%) C1 = 2.2 µF VIN 60 50 2.8 3.1 3.4 3.7 4 VIN(V) 4.3 4.6 4.9 5.2 5.5 VIN(V) <Measurement Data> Efficiency in the range of VIN = 2.8 to 5.5 V 35 100 30 90 25 80 20 70 IIOUT F Efficiency 15 60 10 50 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs Efficiency(%) IF (mA) IOUT(mA) Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8µH Efficiency (%) Average Efficiency (%) 79.85 to 86.97 80.19 to 85.32 78.77 to 83.60 79.72 to 86.39 78.91 to 85.10 84.02 83.39 80.69 82.87 80.49 Output current in the range of VIN = 3.0 to 5.0 V (VIN = 3.6 V typ.) 5.5 Output Current (mA) VIN = 3.6 V VIN(V) 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 21.19 20.89 20.64 20.10 19.95 Tolerance (%) Min Max −3.08 −1.86 −1.68 −1.82 −1.94 1.67 1.33 1.11 1.22 1.26 Note: These application examples are provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design. 10 2005-11-8 TB62756FUG 5. Application Circuit Example and Measurement Data (reference data) VIN = 2.8 to 5.5 V L1 S-Di • Evaluation conditions (Ta = 25°C) SW L1 WLEDs 2 to 4 SHDN FB RSENS = 16 Ω GND : 32R51 (KOA Corp.) (Size: 3.2 mm × 2.5 mm × 0.6 mm) : C2012JB1E225K (TDK Corp.) C1 C2 : C2012JB1E105K (TDK Corp.) S-Di : CUS02 1 A/30 V (TOSHIBA Corp.) WLEDs : NSCW215T (NICHIA Corp.) RSENS : RK73B1ETBK (KOA Corp.) C2 = 1.0 µF 100 30 90 25 80 20 70 IIout F Efficiency Efficiency 15 IF (mA) 35 Output Current (mA) Input Voltage - Efficiency/Output Current 3LED Drive, L=5.1μH Efficiency(%) IF (mA) Output Current (mA) Input Voltage - Efficiency/Output Current 2LED Drive, L=5.1μH 60 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 100 30 90 25 80 70 20 IIout F Efficiency Efficiency 15 60 50 10 50 10 35 2.8 5.5 Efficiency(%) C1 = 2.2 µF VIN 3.1 3.4 3.7 4 VIN(V) 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 35 100 30 90 25 80 70 20 IIout F Efficiency Efficiency 15 60 Efficiency(%) IF (mA) Output Current (mA) Input Voltage - Efficiency/Output Current 4LED Drive, L=5.1μH 2 LEDs 3 LEDs 4 LEDs 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 Average Efficiency (%) 83.08 to 89.23 79.02 to 86.30 75.75 to 83.83 86.73 83.52 80.78 Output current in the range of VIN = 3.0 to 5.0 V (VIN = 3.6 V typ.) Output Current (mA) VIN = 3.6 V 50 10 Efficiency (%) 5.5 2 LEDs 3 LEDs 4 LEDs 21.06 20.57 20.22 Tolerance (%) Min Max −2.46 −2.39 −2.28 4.02 2.94 2.65 Note: These application examples are provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design. 11 2005-11-8 TB62756FUG Package Dimensions Weight: 0.016 g (typ.) 12 2005-11-8 TB62756FUG Notes on Contents Block Diagrams Some functional blocks, circuits, or constants may be omitted or simplified in the block diagram for explanatory purposes. Equivalent Circuitry Some parts of the equivalent circuitry may have been omitted or simplified for explanatory purposes. Maximum Ratings The absolute maximum ratings of a semiconductor device are a set of specified parameter values that must not be exceeded during operation, even for an instant. If any of these ratings are exceeded during operation, the electrical characteristics of the device may be irreparably altered and the reliability and lifetime of the device can no longer be guaranteed. Moreover, any exceeding of the ratings during operation may cause breakdown, damage and/or degradation in other equipment. Applications using the device should be designed so that no maximum rating will ever be exceeded under any operating conditions. Before using, creating and/or producing designs, refer to and comply with the precautions and conditions set forth in this document. Application Examples The application examples provided in this data sheet are provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design. In providing these application examples, Toshiba does not grant the use of any industrial property rights. Handling of the IC Ensure that the product is installed correctly to prevent breakdown, damage and/or degradation in the product or equipment. Short circuiting between output and line to ground faults may result in damage to the IC. Please exercise precaution in designing the output line, power line and GND line so as to prevent such damage. Be careful to insert the IC correctly. Inserting the IC the wrong way (e.g., wrong direction) may result in damage to the IC. Please exercise precaution in handling external components as shorting and opening such components may cause an overcurrent, which in turn may result in power overcurrent and/or in damage to the IC. Overcurrent and Thermal Protection Toshiba does not guarantee that these protection functions will prevent damage to the product. These functions are only intended as a temporary means of preventing output short circuiting and other abnormal conditions. If the guaranteed operating ranges of this product are exceeded, these protection functions may not function as intended and this product might be damaged due to output short circuiting. The overcurrent protection function is intended to protect this product from temporary short circuiting only. Short circuiting that last for a long time may cause excessive stress and damage to this product. 13 2005-11-8 TB62756FUG 14 2005-11-8