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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. This device is Pb-free product.
VQFN16-P-0404-0.65 Weight: 0.016 g (Typ.)
Characteristics
* * * * * * * *
* * Fabricating with CMOS Process Package : VQFN16-P-0404-0.65 Input Voltage : 2.8V (Min) Switching Frequency : 1MHz (Typ.) Output Drive Current Capability : Greater than 120mA 4 Channels Built in Constant Sink Current Drivers (3 or 4 LEDs can be driven.) Sink Current Adjustment by External Resistance Soft Start Function Output Open Detection Function Thermal Shut Down Function (TSD)
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Pin Assignment (top view)
ILED1
ILED2
ILED3
ILED4
EN CTL0 CTL1 CTL2
GND C2+ C2- C1-
ISET
VOUT
Explanation of Terminals
No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol EN CTL0 CTL1 CTL2 ISET VOUT VIN C1+ C1- C2- C2+ GND ILED4 ILED3 ILED2 ILED1 Constant Sink Current Driver terminal. GND terminal. Capacitance connection terminal for charge pump. Resistance connection terminal for setting up output current. Output terminal. Power supply terminal. Function 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 15.
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Block Diagram
C2+ C2- C1+ C1-
VIN
Charge pump Circuit
VOUT
Feed Back Circuit Up Converting Time Change
Feed Back
ILED1 EN ILED2 CTL0 CTL1 CTL2 Control Logic ILED3 ILED4
Constant Current Regulator
ISET
GND
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I/O Equivalent Circuits
1. ILED1~4 2. ISET
VIN
ILED1~4
ISET
3. EN, CTL0, CTL1, CTL2
4. VOUT
VIN VIN
VOUT
EN,CTL0,CTL1,CTL2
5. C1+, C2+
6. C1-
C1+, C2+
C1-
7. C2-
C2-
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Absolute Maximum Ratings (Ta = 25C if without notice)
Characteristics Power Supply Voltage Input Output Voltage Current Symbol VIN VIN(LOGIC) 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
Operating Temperature Storage Temperature Junction Temperature *1 : please do not exceed 6V.
Recommended Operating Condition (Ta=-40C to 85C if without notice)
Characteristics Power Logic Supply Voltage Symbol VIN VIN(LOGIC) C1,C2 COUT CIN RSET Test Condition EN,CTL0,CTL1,CTL2 Min 2.8 0 0.8 0.8 0.8 8.2 Typ 1.0 1.0 2.2 12 Max 4.2 VIN 2.2 4.7 10.0 47 Unit V V F F F k
Input
Capacitance for Charge Pump Capacitance for output Capacitance for input R
SET
resistance
Electrical Characteristics
DC-DC Regulator part (VIN=3.6V, Ta=25C, if it is not specified.)
Characteristics Symbol Test Circuits Test Condition 2 time up converting Output Current Ability Consumption Current Stand By Consumption Current Logic Input Voltage Logic Clock T O T Input A L H L i o g h w IOUT(MAX) IIN(ON) IIN(OFF) VIH VIL Ileak fOSC RON VTRANS1X 1 2 2 3 3 3 4 1 4 1.5 time up converting 1 time up converting EN="H", RSET=47k EN="L" EN, CTL0,CTL1,CTL2 VIN=2.8V~4.2V EN,CTL0,CTL1,CTL2 VIN=2.8V~4.2V EN,CTL0,CTL1,CTL2 1.5 time up converting LED Vf=3.6V, RSET=12k 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
Current R
Frequency
O N
1X mode to 1.5X mode transition voltage
Constant Current Driver part (VIN=3.6V, Ta=25C, if it is not specified.)
Characteristics Symbol Test Circuits 5 5 5 5 5 5 Test Condition RSET=47k RSET=12k RSET=8.2k RSET=8.2k VIN=3.6V center,VIN=2.8~4.2V IOUT=80mA EN="L" Min Typ 5.1 19.6 28 0.61 2.5 5 1 1 Max Unit
Constant Current Drive Setting
ILED1~4
mA V % % % A
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 |ILED| Supply Voltage Regulation Output leakage current ILEAK1~4
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Test Circuits
Test Circuit1: Output Current Ability, TOTAL RON
VIN=2.8V~4.2V
CIN=2.2F C1=1.0F VIN VOUT ISET C1+ COUT=1.0F
VIN
V
C1C2=1.0F C2C2+ ILED3
CTL2 CTL1 CTL0
ILED2
ILED4
ILED1
GND
EN
VOUT (VINx1.5) - VOUT IOUT
V
A
IOUT=120mA
RON=
Test Circuit2: Consumption Current, Stand By Consumption Current
RSET=47k
VIN=3.6V
A
C1=1.0F VIN VOUT ISET C1+ COUT=1.0F
CIN=2.2F
C1C2=1.0F C2C2+ ILED3
CTL2 CTL1 CTL0
ILED2
ILED4
ILED1
EN
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Test Circuit3: Logic Input Voltage, Logic Input Current
RSET=47k
VIN=2.8V~4.2V
CIN=2.2F C1=1.0F VIN VOUT ISET C1+ COUT=1.0F VIN(LOGIC)=0V 4.2V
C1C2=1.0F C2C2+ ILED3
CTL2 CTL1 CTL0
A
VIN(LOGIC)=0V 4.2V
A A A V V V V
VIN(LOGIC)=0V 4.2V VIN(LOGIC)=0V 4.2V
ILED2
Test Circuit4: Clock Frequency, 1X mode to 1.5X mode transition voltage
RSET=12k
ILED4
ILED1
EN
VIN=2.8V~4.2V
A
C1=1.0F VIN VOUT ISET C1+ COUT=1.0F
CIN=2.2F
V
C1C2=1.0F C2C2+ ILED3
CTL2 CTL1 CTL0
ILED2
ILED4
ILED1
F
GND
EN
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Test Circuit5: Constant Current Drive Setting, ISET Terminal Output Voltage, Constant Current Accuracy Test Circuit5: Constant Sink Current Supply Voltage Regulation, Output leakage current
V
RSET=47k, 12k, 8.2k
VIN=2.8V~4.2V
CIN=2.2F C1=1.0F VIN VOUT ISET ILED1 C1+ COUT=1.0F
C1C2=1.0F C2C2+ ILED3 ILED4
CTL2 CTL1 CTL0
A
A
ILED2
EN
A
A
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Reference data
*This data is provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design.
Efficiency vs. IOUT
Efficiency (%)
Efficiency (%)
100 90 80 70 60 50 40 30 20 10 0 0
100 90 80 70 60 50 40 30 20 10 0
Efficiency vs. VIN
VIN=3.0V VIN=3.3V VIN=3.6V
LED Vf=3.3V Ta=25C
VIN=3.9V VIN=4.2V
4LEDs at 20mA LED Vf=3.51V
Ta=25C
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
Ta=25C
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
Ta=25C
3.0
3.2
3.4 3.6 VIN (V)
3.8
4.0
4.2
40
60 80 100 IOUT Current (mA)
120
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IOUT Current vs. VIN
4LEDs at 30mA 4LEDs at 20mA 4LEDs at 5mA
160 140 IOUT Current (mA) 120 100 80 60 40 20 0 2.8 3.0
40
Ta=25C
ILED Current vs. VIN
4LEDs at 30mA 4LEDs at 20mA 4LEDs at 5mA
35 ILED Current (mA) 30 25 20 15 10 5 0
Ta=25C
3.2
3.4 3.6 VIN (V)
3.8
4.0
4.2
2.8
3.0
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
Ta=25C
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~47k A
VIN=2.8V~4.2V
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.) : C1608JB1C225K (TDK Corp.) CIN COUT : C1608JB1C105K (TDK Corp.) C1 : C1608JB1C105K (TDK Corp.) C2 : C1608JB1C105K (TDK Corp.)
C2=1.0F
C2C2+ ILED3 ILED4 ILED2 GND
ILED1
V
A
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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]
RSET vs ILED 35 30 25 ILED(mA) 20 15 10 5 0 0 5 10 15 20 25 RSET (k) 30 35 40 45 50
RSET
VIN=2.8V~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
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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 COUT. Please note it.
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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~0.61V R2=47k R1=16k
VIN=2.8V~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.
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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 ON M2 ON R[k] RSET[k] x R1[k] x R2[k] R1[k]xRSET[k] + R2[k]xRSET[k] RSET[k] x R1[k] RSET[k] + R1[k] RSET[k] x R2[k] RSET[k] + R2[k] RSET[k] + R1[k]xR2[k]
ON
OFF
OFF
ON
OFF
OFF
M2
R2
M1
R1
RSET VIN=2.8V~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.
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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 ILED3 Output ILED2 ILED1
Please do not set it.
OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF
ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF
ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF
ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF
Attention in use
*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 1.0 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.
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Package Dimensions
VQFN16-P-0404-0.65
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.)
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Notes on Contents
1. Block Diagrams
Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for explanatory purposes. The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes. Timing charts may be simplified for explanatory purposes. The application circuits shown in this document are provided for reference purposes only. Thorough evaluation is required, especially at the mass production design stage. Toshiba does not grant any license to any industrial property rights by providing these examples of application circuits. Components in the test circuits are used only to obtain and confirm the device characteristics. These components and circuits are not guaranteed to prevent malfunction or failure from occurring in the application equipment.
2. Equivalent Circuits 3. Timing Charts
4. Application Circuits
5. Test Circuits
IC Usage Considerations
Notes on handling of ICs
[1] The absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceeded, even for a moment. Do not exceed any of these ratings. Exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. [2] Use an appropriate power supply fuse to ensure that a large current does not continuously flow in case of over current and/or IC failure. The IC will fully break down when used under conditions that exceed its absolute maximum ratings, when the wiring is routed improperly or when an abnormal pulse noise occurs from the wiring or load, causing a large current to continuously flow and the breakdown can lead smoke or ignition. To minimize the effects of the flow of a large current in case of breakdown, appropriate settings, such as fuse capacity, fusing time and insertion circuit location, are required. [3] If your design includes an inductive load such as a motor coil, incorporate a protection circuit into the design to prevent device malfunction or breakdown caused by the current resulting from the inrush current at power ON or the negative current resulting from the back electromotive force at power OFF. IC breakdown may cause injury, smoke or ignition. Use a stable power supply with ICs with built-in protection functions. If the power supply is unstable, the protection function may not operate, causing IC breakdown. IC breakdown may cause injury, smoke or ignition. [4] Do not insert devices in the wrong orientation or incorrectly. Make sure that the positive and negative terminals of power supplies are connected properly. Otherwise, the current or power consumption may exceed the absolute maximum rating, and exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. In addition, do not use any device that is applied the current with inserting in the wrong orientation or incorrectly even just one time. [5] Carefully select external components (such as inputs and negative feedback capacitors) and load components (such as speakers), for example, power amp and regulator. If there is a large amount of leakage current such as input or negative feedback condenser, the IC output DC voltage will increase. If this output voltage is connected to a speaker with low input withstand voltage, overcurrent or IC failure can cause smoke or ignition. (The over current can cause smoke or ignition from the IC itself.) In particular, please pay attention when using a Bridge Tied Load (BTL) connection type IC that inputs output DC voltage to a speaker directly.
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