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TCA62735AFLG TOSHIBA CMOS INTEGRATED CIRCIUTS SILICON MONOLITHIC
TCA62735AFLG
Charge Pump type DC/DC Converter for White LED Driver
The TCA62735AFLG is a charge pump type DC/DC Converter specially designed for constant current driving of White LED. This IC can outputs LED current 120mA or more to 2.8-4.2V input. This IC observes the power-supply voltage and the output voltage, and does an automatic change to the best of step up mode 1, 1.5 or 2 times. It is possible to prolong the battery longevity to its maximum. This IC is especially for driving back light white LEDs in LCD of PDA, Cellular Phone, or Handy Terminal Equipment. Weight: 0.016 g (Typ.)
Characteristics
* * * * * * * * *
* * Fabricating with CMOS Process Package : QFN16 (4mm x 4mm x 0.8mm) Input Voltage : 2.8V (Min) Output Voltage : 4.2V (Min) Switching Frequency : 1MHz(Typ.) Output Drive Current Capability : Greater than 120mA 4 Channels Built in Constant Sink Current Drivers Sink Current Adjustment by External Resistance Soft Start Function Output Open Detection Function Integrated protection circuit TSD (Thermal Shut Down)
Pin Assignment (top view)
Application Diagram
ILED1 ILED2 ILED3 ILED4
C1 1.0F GND C2+ C2- C1- CIN 2.2F VIN=2.8~4.2V
C1+ C1- EN CTL0 CTL1 CTL2
C2+ C2- VOUT ILED1 ILED2 ILED3 ILED4 ISET 30mA 30mA 30mA 30mA
C2 1.0F
EN CTL0 CTL1 CTL2
COUT 1.0F
VIN GND
ISET
VOUT
Company Headquarters 3 Northway Lane North Latham, New York 12110 Toll Free: 800.984.5337 Fax: 518.785.4725
C1+
VIN
RSET 8k
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California Sales Office: 950 South Coast Drive, Suite 225 Costa Mesa, California 92626 Toll Free: 800.984.5337 Fax: 714.850.9314
TCA62735AFLG
TENTATIVE Block Diagram
C2+ C2- C1+ C1-
VIN VOUT
Feed Back Circuit Up Converting Time Change
Feed Back
EN CTL0 CTL1 CTL2
ON/OFF
ILED1 ILED 2
Control Logic
ILED 3 ILED 4
Constant Current Regulator
ISET
GND
Explanation of Terminals
No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Symbol Function
EN CTL0 CTL1 CTL2 ISET VOUT VIN C1+ C1- C2- C2+ GND ILED4 ILED3 ILED2 ILED1
Logic input terminal. (input a chip enable signal) EN = "H" Operation mode, EN = "L" Shutdown mode Logic input terminal. (Selection of an output number) Please refer to the truth table on page 10. Resistance connection terminal for setting up output current. Output terminal. Power supply terminal.
Capacitance connection terminal for charge pump.
GND terminal.
Constant Sink Current Driver terminal. ILED(mA) = 0.61V x 400 / RSET(k)
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 2 of 12)
TCA62735AFLG
TENTATIVE Absolute Maximum Ratings (Topr = 25C if without notice)
Characteristics Power Supply Voltage Symbol VIN Vin IOUT Topr Tstg Tj Ratings -0.3~+6.0 -0.3~VIN+0.3(*1) 200 -40~+85 -55~+150 150 Unit V mA mA/ch C C C
Input Output Operating Storage Junction
Voltage Current Temperature Temperature Temperature
*1 : please do not exceed 6V.
Recommended Operating Condition (Topr=-40C to 85C if without notice)
Characteristics Power Logic Input Supply Voltage Voltage Symbol VIN Vin VIN(ripple) C1,C2 COUT CIN RSET Test Condition EN,CTL0,CTL1,CTL2 Min 2.8 0 0.8 0.8 0.8 2 Typ 1.0 2.2 2.2 8 Max 4.2 VIN 40 2.2 4.7 10.0 80 Unit V V mVpp F F F k
Input Ripple
Capacitance for Charge Pump Capacitance for output Capacitance R
SET
for
input
resistance
Electrical Characteristics DC-DC Regulator part (VIN=3.6V, Topr=-40 to 85C, if it is not specified.)
Characteristics Symbol Test Condition 2 time up converting Output Current Ability Current IOUT(MAX) IIN(ON) IIN(OFF) VIH VIL Ileak fOSC RON VTRANS1X 1.5 time up converting 1 time up converting Consumption IOUT=5mA IOUT=0mA EN="L" EN, CTL0,CTL1,CTL2 VIN=2.8V to 4.2V EN,CTL0,CTL1,CTL2 VIN=2.8V to 4.2V EN,CTL0,CTL1,CTL2 1.5 time up converting LED Vf=3.6V,IOUT=80mA VIN falling Min 120 120 120 0.7VIN Typ 1 0 1000 5 4.0 Max 2 1 V 0.3VIN 0.1 10 A kHz V mA A mA Unit
Stand By Consumption Current H L i o g h w
Logic Input Voltage Logic Clock T O T
Input A L
Current R
Frequency
O N
1X mode to 1.5X mode transition voltage
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 3 of 12)
TCA62735AFLG
TENTATIVE Constant Current Driver part (VIN=2.8V to 4.2V, Topr=-40 to 85C, if it is not specified.)
Characteristics Constant Current Drive Setting Symbol ILED1~4 Test Condition RSET=47k RSET=12k RSET=8.2k RSET=8.2k VIN=3.6V center VIN=2.8 to 4.2V IOUT=80mA CIN=2.2F EN="H" ILED1 to4="OFF" Min Typ 5.1 19.6 28 0.61 2.5 5 1 Max Unit mA V % % %
ISET Terminal Output Voltage VSET Constant Current Between Chs |ILED-LED-ERR| A c c u r a c y Between ICs |ILED-ERR| Constant Sink Current S u p p l y Vo l t a g e R e g u l a t i o n Output leakage current |ILED|
ILEAK1~4
1
A
Reference data
100 90 80 70 60 50 40 30 20 10 0 0
Efficiency vs. IOUT
100 90 80 Efficiency (%) 70 60 50 40 30 20 10 0
Efficiency vs. VIN
Efficiency (%)
VIN=3.0V VIN=3.3V VIN=3.6V VIN=3.9V
LED Vf=3.3V
VIN=4.2V
4LEDs at 20mA LED Vf=3.51V
20
40
60 80 IOUT (mA)
100
120
4.3
4.1
3.9
3.7
3.5 3.3 VIN (V)
3.1
2.9
2.7
4.0 3.5 Quiescent Current (mA) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 2.8
Quiescent Current vs. VIN
4.0 3.5 Quiescent Current (mA) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 20
Quiescent Current vs. IOUT Current
VIN=2.7V VIN=3.6V VIN=4.3V
4LEDs at 30mA 4LEDs at 20mA 4LEDs at 5mA
3.0
3.2
3.4 3.6 VIN (V)
3.8
4.0
4.2
40
60 80 100 IOUT Current (mA)
120
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 4 of 12)
TCA62735AFLG
TENTATIVE
160 140 IOUT Current (mA) 120 100 80 60 40 20 0 2.8 3.0 3.2 3.4 3.6 VIN (V) 3.8 4.0 4.2 IOUT Current vs. VIN
4LEDs at 30mA 4LEDs at 20mA 4LEDs at 5mA
40 35 ILED Current (mA) 30 25 20 15 10 5 0 2.8 3.0
ILED Current vs. VIN
4LEDs at 30mA 4LEDs at 20mA 4LEDs at 5mA
3.2
3.4 3.6 VIN (V)
3.8
4.0
4.2
4.1 4.0 VIN_transition voltage (V) 3.9 3.8 3.7 3.6 3.5 3.4 5
1x Mode Transition V oltage vs. ILED Current
LED Vf=3.2V,4c h ON LED Vf=3.4V,4c h ON LED Vf=3.6V,4c h ON
10
15 20 ILED Current (mA )
25
30
Evaluation Circuit
RSET=8.2k to 47k
VIN=2.8V to 4.2V
A C1=1.0F
C1+ VIN VOUT
COUT=1.0F
ISET
V
CIN=2.2F
C1-
CTL2 CTL1 CTL0 EN * Evaluation conditions LED : NACW215 (NICHIA Corp.) CIN : C1608JB1C225K (TDK Corp.) : C1608JB1C105K (TDK Corp.) COUT C1 : C1608JB1C105K (TDK Corp.) C2 : C1608JB1C105K (TDK Corp.)
C2=1.0F
C2C2+ ILED3 ILED4 ILED2 GND
ILED1
V
A
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 5 of 12)
TCA62735AFLG
TENTATIVE Method of setting ILED
The current of the terminal ILED1 to 4 is set by resistance RSET connected with the terminal ISET. ILED can be set according to the next expression. ILED[mA] = 400 x 0.61[V] RSET[k]
35 30 ILED(mA) 25 20 15 10 5 0 0
RSET vs. ILED
20
40 RSET k
60
RSET
VIN=2.8V to 4.2V
CIN=2.2F COUT=1.0F C1=1.0F
C1+ VIN VOUT ISET ILED1
C1-
CTL2 CTL1 CTL0
C2=1.0F
C2C2+ ILED4 ILED3 ILED2 GND
EN
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 6 of 12)
TCA62735AFLG
TENTATIVE Method of Current Dimming control
1) Input PWM signal to SHDN terminal ILED can be set according to the next expression. ILED[mA] = 0.61[V] x 400 x ON Duty[%] RSET[k]
fPWM will recommend 100Hz.
100
Ch1 : VPWM
PWM Duty vs . IOUT
80 IOUT (mA) 60 40 20
Ch2 : IIN
Ch3 : VOUT
Ch4 : IOUT
0 0 20 40 60 PWM Duty (%) 80 100
RSET=12k
VIN=3.6V
CIN=2.2F COUT=1.0F C1=1.0F
C1+ VIN VOUT ISET
C1-
CTL2 CTL1 CTL0 EN
C2=1.0F
C2C2+ ILED4 ILED3 ILED2 GND
ILED1
PWM signal fPWM=100Hz, ON Duty50%
*In this PWM control operation, This IC repeats ON/OFF. In this result, rush current is occur when ON timing with supplying charge to C2OUT. Please note it.
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 7 of 12)
TCA62735AFLG
TENTATIVE
2) Input analog voltage to ISET terminal 1. Precondition * Please set the range of the analog voltage input by 0 to 0.61V. 2. The maximum current is defined as mA. R1[k] + R2[k] [mA] = 0.61[V] x x 400 R1[k] x R2[k] 3. A minimum current is defined as mA. [mA] = 0.61[V] x 1
x 400
R2[k] 4. ILED can be set according to the next expression. ILED[mA] = VADJ[V] x [mA] - [mA] 0.61[V] + [mA]
ILED vs. VADJ 25 20 ILED (mA) 15 10 5 0 0 0.2 VADJ (V) 0.4 0.6
VADJ=0V to 0.61V R2=47k R1=16k
VIN=2.8V to 4.2V
CIN=2.2F C1=1.0F
C1+ VOUT VIN
COUT=1.0F
ISET ILED1
C1-
CTL2 CTL1 CTL0 EN
C2=1.0F
C2C2+ ILED3 ILED4 ILED2 GND
This method is without repeating IC ON/OFF, and no need to consider holding rash current.
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 8 of 12)
TCA62735AFLG
TENTATIVE
3) Input Logic signal User can adjust ILED with Logic signal input as indicated in recommended circuit. The Resistor connected the ON-State Nch MOS Drain and RSET determines ILED. ILED can be set according to the next expression. ILED[mA] = 400 x 0.61[V] R[k]
About combined resistance R[k] M1 M2 ON ON R1[k]xRSET[k] +
R[k] RSET[k] x R1[k] x R2[k] R2[k]xRSET[k] + R1[k]xR2[k]
ON
OFF
RSET[k] x R1[k] RSET[k] + R1[k] RSET[k] x R2[k] RSET[k] + R2[k] RSET[k]
OFF
ON
OFF
OFF
M2
R2
M1
R1
RSET VIN=2.8V to 4.2V
CIN=2.2F C1=1.0F
VIN VOUT C1+
COUT=1.0F
ISET ILED1
C1-
CTL2 CTL1 CTL0 EN
C2=1.0F
C2C2+ ILED3 ILED4 ILED2 GND
This method is without repeating IC ON/OFF, and no need to consider holding rash current.
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 9 of 12)
TCA62735AFLG
TENTATIVE Selection of an output number by CTL0, CTL1, and CTL2 Terminal
Truth Table Input CTL2 L L L L H H H H L L L L H H H H CTL1 L L H H L L H H L L H H L L H H CTL0 L H L H L H L H L H L H L H L H EN H H H H H H H H L L L L L L L L ILED4 OFF OFF OFF ON OFF OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF ILED3 OFF OFF ON OFF OFF ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF Output ILED2 OFF ON OFF OFF ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF ILED1 ON OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF
*Soft Start Function This device is integrated Soft start function. When the power supply is ON or output is started to operate, the transition time is controlled in order to decrease the rush current. (Reference data: The output voltage is time 200s of made from 0 to 4.0V at the VIN=2.8V time.) *Inrush Current of Input Current The inrush current flows when start-up and mode switching. (Reference data: Inrush current at CE1/CE2="L" to "H" is 500mA.) *Thermal Shut Down Function This device has Thermal Shutdown Function to protect from thermal damage when the output is shorted. The temperature to operate this function is set around from 140 to 160C. (This is not guaranteed Value.) *The Selection of Capacitor for Charge Pump, Input and Output The input capacitor is effective to decrease the impedance of power supply and also input current is averaged. The input capacitor should be selected by impedance of power supply, it is better to choose with lower ESR (Equivalent Series Resistor). (i.e. ceramic capacitor etc.) Regarding to the capacitance values, it is recommended to choose in the range from 0.8 F to 10 F, however larger than 2.2 F should be better. The output capacitor is effective to decrease the ripple noise of the output line. Also, it is better to choose the capacitor.) Regarding to the capacitance values, it is recommended to choose in the range from 0.8 F to 4.7 F, however larger than 2.2 F should be better. The capacitor for charge pump operation is also selected the capacitor with low ESR. .) Regarding to the capacitance values, it is recommended to choose in the range from 0.8 F to 2.2 F, however larger than 1.0 F should be better.
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 10 of 12)
TCA62735AFLG
TENTATIVE Package Dimensions
QFN16 Unit : mm
4.00Typ. 3.75Typ.
3.75Typ. 0.28 + 0.07
0.9MAX
0.05
0.25MIN
+ 0.15 0.60 0.10
0.65Typ.
Weight: 0.016 g (Typ.)
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 11 of 12)
4.00Typ.
TCA62735AFLG
TENTATIVE
Regarding solder ability
Regarding solder ability, the following conditions have been confirmed. Solder ability (1) Use of Sn-63Pb solder bath * solder bath temperature = 230C, 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 = 245C, dipping time = 5 seconds, number of times = once, use of R-type flux
NOTES
* Utmost care is necessary in the design of the output line, VCC, COMMON and GND line since IC may be destroyed due to short-circuit between outputs, air contamination fault, or fault by 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 of 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. * Please take care that IC might be destroyed in case external components were destroyed or not connected exactly.
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.
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 12 of 12)

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