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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 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.)
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TB62756FUG
Block Diagram
4 VIN 3 Monostable multivibrator for reference Monostable multivibrator for off time control CTL AMP. SW NC
2
Circuit on/off SHDN 1
Error AMP.
6 FB
5 GND
Pin Assignment (top view)
SHDN 1
6 FB
Q
(NC) 2
5 GND 4 SW
VIN 3
Note 1:
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 3 4 5 6 NC VIN SW GND FB No Connection or Connected to GND. (Note 2) Supply voltage pin. Supply voltage range : 2.8V to 5.5V DC-DC converter switching pin - switch incorporates N-ch MOSFET. Ground pin. Connected to the cathode of LED.
Note 2:
The NC terminal is not connected to the internal circuit.
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I/O Equivalent Pin Circuits
1. SHDN pin
VIN
2. NC pin
SHDN
1
NC
2
The NC pin is not connected to any internal circuit.
3.
SW pin
4.
FB pin
SW
4 VIN
FB
6
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Application Circuit Example
VIN 4.7-10H
4 VIN 3
Monostable multivibrator for reference
SW
2
NC
Monostable multivibrator for off time control CTL AMP.
Vz=24V
2.2F Circuit on/off 500 Error AMP.
1F
6 FB
16 @20mA
SHDN
PWM
1 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 )
S-Di R_DZ () 500 100 IZD (mA) 0.6 (Typ.) 2.8 (Typ.) R_ZD GND FB RSENS SW IZD IF 1 F C2
In order to avoid adverse effects on driver characteristics, Toshiba recommends a resistance of 500 ohms or less.
Protection circuit application
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Output-side Capacitor Setting
It is recommended that the value of C2 be equal to, or greater than 1.0 (F).
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 2 3 4 5 6 10 Inductance (Unit: H) 4.7 6.8 IF = 20 mA Note
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() ] 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 33s. Duty ratio of PWM function should be set at 10% - 90%. The recommended PWM frequency should be 100Hz - 10kHz. <> IF(mA) = 325[mV] x ON Duty [%] RSENS []
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Absolute Maximum Ratings (Ta = 25C, unless otherwise specified)
Characteristics Power supply voltage Input voltage Switching pin voltage Switching pin current Power Dissipation Symbol VIN VSHDN VO (SW) IO (SW) PD Rth (j-a) 1 Rth (j-a) 2 Topr Tstg Tj Ratings -0.3 to 6.0 -0.3 to VIN + 0.3(Note3) -0.3 to 24 380 0.41 (IC only) 0.47 (IC mounted on PCB)(Note4) 300 (IC only) 260 (IC mounted on PCB) -40 to 85 -55 to 150 150 Unit V V V mA W
Thermal resistance Operating temperature range Storage temperature Maximum junction temperature
C/W C C C
Note3: However, do not exceed 6V. Note4: Power dissipation is reduced by 3.8mW/C from the maximum rating for every 1C exceeding the ambient temperature of 25C (when the IC is mounted on a PCB).
Recommended Operating Condition (Ta = -40 to 85C, unless otherwise specified)
Characteristics Power supply voltage SHDN pin input pulse width LED current (Average value) Symbol VIN tpw IF1 Test Conditions ON/OFF duty width VIN = 3.6 V, RSENS = 16 4LEDs, Ta = 25C Min. 2.8 33 Typ. 20 Max. 5.5 Unit V s A
Electrical Characteristics (Ta = 25C VIN = 2.8~5.5 V, unless otherwise specified)
Characteristics Operating consumption current Standby consumption current SHDN pin H level input voltage SHDN pin L level input voltage SHDN pin current Integrated MOS-FET switching frequency Switching pin protection voltage Switching pin current Switching pin leakage current FB pin feedback voltage FB pin line regulation Symbol IIN (ON) IIN (OFF) VSHDN (H) VSHDN (L) ISHDN fOSC VO (SW) IO (SW) IOZ (SW) VFB VFB Test Conditions VIN = 6.0 V, RSENS = 16 VIN = 3.6 V, VSHDN = 0 V VIN = 3.6 V, VSHDN = 3.6 V VIN = 3.6 V, VSHDN = 3.6 V VIN = 3.6 V, RSENS = 16 L = 4.7H VIN = 3.6 V center VIN = 3.0V to 5.0V Min. 1.3 0 -10 0.77 308 -5 Typ. 0.9 0.5 0 1.1 25 400 0.5 325 Max. 1.5 1.0 VIN 0.4 10 1.43 1 342 5 Unit mA A V V A MHz V mA A mV %
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1. Application Circuit Example and Measurement Data (reference data)
VIN = 2.8 to 5.5 V L1 S-Di
* Evaluation conditions (Ta = 25C)
C1 = 2.2 F
SHDN
FB
Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7H 35 30 100 90 Efficiency(%) 35 30
RSENS = 16
GND
C2 = 1.0 F
VIN
SW
WLEDs 2 to 6
L1
: CXLD120 series (NEO MAX CO.,Ltd.) (Size: 2.5 mm x 3.0 mm x 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.)
Input Voltage - Efficiency/Output Current 5LED Drive, L=10H 100 90 80 70 IOUT IF Efficiency 60 50 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) Efficiency(%)
IF (mA) IOUT(mA)
IF (mA) IOUT(mA)
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) IOUT IF Efficiency
80 70 60 50
25 20 15 10
Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8H 35 30 100 90 Efficiency(%) 80 70 35 30 IOUT(mA) IF (mA) 25 20 15 10 2.8 3.1
Input Voltage - Efficiency/Output Current 6LED Drive, L=10H 100 90 80 70 IOUT IF Efficiency 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 60 50 VIN(V) Efficiency(%)
IF (mA) IOUT(mA)
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V)
IF IOUT Efficiency
60 50

Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8H 35 30 100 90 80 70 IOUT IF Efficiency 60 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 Efficiency(%)
Efficiency in the range of VIN = 2.8 to 5.5 V Efficiency (%) 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 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 Average Efficiency (%) 86.29 85.95 83.05 83.45 81.15
IF (mA) IOUT(mA)
25 20 15 10
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 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.
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2. Application Circuit Example and Measurement Data (reference data)
VIN = 2.8 to 5.5 V L1 S-Di
* Evaluation conditions (Ta = 25C)
C1 = 2.2 F
SHDN
FB
Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7H 35 30 IOUT(mA) IF (mA) 25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 100 90 Efficiency(%) 35 30
RSENS = 16
GND
C2 = 1.0 F
VIN
SW
WLEDs 2 to 6
L1
: 1001AS series (TOKO, INC) (Size: 3.6 mm x 3.6 mm x 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.)
Input Voltage - Efficiency/Output Current 5LED Drive, L=10H 100 90 80 70 IOUT IF Efficiency 60 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 Efficiency(%)
IF (mA) IOUT(mA)
80 70
25 20 15 10
IF IOUT Efficiency
60 50
Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8H 35 30 100 90 Efficiency(%) 35 30
Input Voltage - Efficiency/Output Current 6LED Drive, L=10H 100 90 80 70 IOUT IF Efficiency 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 60 50 Efficiency(%)
IF (mA) IOUT(mA)
IF (mA) IOUT(mA)
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) IOUT IF Efficiency
80 70 60 50
25 20 15 10

Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8H 35 30 100 90 80 70 Efficiency(%)
Efficiency in the range of VIN = 2.8 to 5.5 V Efficiency (%) 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 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 Average Efficiency (%) 86.55 84.54 81.30 82.87 80.47
IF (mA) IOUT(mA)
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5
IF IOUT Efficiency
60 50
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 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.
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3. Application Circuit Example and Measurement Data (reference data)
VIN = 2.8 to 5.5 V L1 S-Di
* Evaluation conditions (Ta = 25C)
C1 = 2.2 F
SHDN
FB
Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7H 35 30 IOUT(mA) IF (mA) 25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) 100 90 Efficiency(%) 35 30
RSENS = 16
GND
C2 = 1.0 F
VIN
SW
WLEDs 2 to 6
L1
: LQH2M series (Murata Manufacturing Co.,Ltd.) (Size: 2.0 mm x 1.6 mm x 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.)
Input Voltage - Efficiency/Output Current 5LED Drive, L=10H 100 90 80 70 Efficiency(%)
IF (mA) IOUT(mA)
80 70
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5
IF IOUT Efficiency Efficiency
60 50
IF IOUT Efficiency
60 50
Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8H 35 30 100 90 Efficiency(%) 35 30
Input Voltage - Efficiency/Output Current 6LED Drive, L=10H 100 90 80 70 IOUT IF Efficiency 60 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 Efficiency(%)
IF (mA) IOUT(mA)
IF (mA) IOUT(mA)
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V)
80 70
25 20 15 10
IF IOUT Efficiency
60 50

Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8H 35 30 100 90 80 70 IOUT IF Efficiency 60 50 2.8 3.1 3.4 3.7 4 4.3 VIN(V) 4.6 4.9 5.2 5.5 Efficiency(%)
Efficiency in the range of VIN = 2.8 to 5.5 V Efficiency (%) 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 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 Average Efficiency (%) 86.38 84.12 80.16 79.94 77.17
IF (mA) IOUT(mA)
25 20 15 10
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 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.
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4. Application Circuit Example and Measurement Data (reference data)
VIN = 2.8 to 5.5 V L1 S-Di
* Evaluation conditions (Ta = 25C)
C1 = 2.2 F
SHDN
FB
Input Voltage - Efficiency/Output Current 2LED Drive, L=4.7H 35 30
IF (mA) IOUT(mA)
RSENS = 16
GND
C2 = 1.0 F
VIN
SW
WLEDs 2 to 6
L1
: VLF3010A series (TDK Corp.) (Size: 3.0 mm x 3.0 mm x 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.)
Input Voltage - Efficiency/Output Current 5LED Drive, L=10H
100 90 Efficiency(%)
IF (mA) IOUT(mA)
35 30 25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V)
100 90 80 70 Efficiency(%)
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) IOUT IF Efficiency
80 70 60 50
IF IOUT Efficiency
60 50
Input Voltage - Efficiency/Output Current 3LED Drive, L=6.8H 35 30 100 90 Efficiency(%) 35 30
Input Voltage - Efficiency/Output Current 6LED Drive, L=10H 100 90 80 70 IOUT IF Efficiency 60 50 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) Efficiency(%)
IF (mA) IOUT(mA)
IF (mA) IOUT(mA)
25 20 15 10 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 VIN(V) IOUT IF Efficiency
80 70 60 50
25 20 15 10

Input Voltage - Efficiency/Output Current 4LED Drive, L=6.8H 35 30 100 90 80 70 IOUT IF Efficiency 2.8 3.1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 60 50 VIN(V) Efficiency(%)
Efficiency in the range of VIN = 2.8 to 5.5 V Efficiency (%) 2 LEDs 3 LEDs 4 LEDs 5 LEDs 6 LEDs 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 Average Efficiency (%) 84.02 83.39 80.69 82.87 80.49
IF (mA) IOUT(mA)
25 20 15 10
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 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.
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5. Application Circuit Example and Measurement Data (reference data)
VIN = 2.8 to 5.5 V L1 S-Di
* Evaluation conditions (Ta = 25C)
C1 = 2.2 F
SHDN
FB
IF (mA)
RSENS = 16
GND
IF (mA)
C2 = 1.0 F
VIN
SW
WLEDs 2 to 4
L1
: 32R51 (KOA Corp.) (Size: 3.2 mm x 2.5 mm x 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.)
IF Efficiency
IF Efficiency

Efficiency in the range of VIN = 2.8 to 5.5 V Efficiency (%) 2 LEDs 3 LEDs 4 LEDs
IF Efficiency
Average Efficiency (%) 86.73 83.52 80.78
IF (mA)
83.08 to 89.23 79.02 to 86.30 75.75 to 83.83
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 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.
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Package Dimensions
Weight: 0.016 g (typ.)
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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.
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