TOSHIBA TCA62735AFLG

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
•
Output Open Detection Function
•
Thermal Shut Down Function (TSD)
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
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2007-06-21
TCA62735AFLG
ILED4
ILED3
ILED2
ILED1
Pin Assignment (top view)
CTL1
C2−
CTL2
C1−
C1+
C2+
VIN
CTL0
VOUT
GND
ISET
EN
Explanation of Terminals
No
Symbol
Function
1
EN
2
CTL0
3
CTL1
4
CTL2
5
ISET
Resistance connection terminal for setting up output current.
6
VOUT
Output terminal.
7
VIN
8
C1+
9
C1−
10
C2−
11
C2+
12
GND
13
ILED4
14
ILED3
15
ILED2
16
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 15.
Power supply terminal.
Capacitance connection terminal for charge pump.
GND terminal.
Constant Sink Current Driver terminal.
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TCA62735AFLG
Block Diagram
C2+
VIN
C2–
C1+
C1–
Charge pump Circuit
Feed Back Circuit
Up Converting
Time Change
VOUT
Feed Back
ILED1
EN
ILED2
CTL0
CTL1
ILED3
Control
Logic
ILED4
CTL2
Constant
Current
Regulator
GND
ISET
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TCA62735AFLG
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-
C1+, C2+
7. C2-
C2-
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TCA62735AFLG
Absolute Maximum Ratings (Ta = 25°C if without notice)
Characteristics
Symbol
Ratings
Unit
Power Supply Voltage
VIN
−0.3~+6.0
V
VIN(LOGIC)
−0.3~VIN+0.3(*1)
mA
C u r r e n t
IOUT
200
mA/ch
Operating Temperature
Topr
−40~+85
°C
Storage Temperature
Tstg
−55~+150
°C
Junction Temperature
Tj
150
°C
I n p u t
V o l t a g e
O u t p u t
*1 : please do not exceed 6V.
Recommended Operating Condition (Ta=-40°C to 85°C if without notice)
Characteristics
P o w e r
Symbol
Min
Typ
Max
Unit
VIN
-
2.8
-
4.2
V
VIN(LOGIC)
EN,CTL0,CTL1,CTL2
0
-
VIN
V
Capacitance for Charge Pump
C1,C2
-
0.8
1.0
2.2
µF
Capacitance for output
COUT
-
0.8
1.0
4.7
µF
Capacitance for input
CIN
-
0.8
2.2
10.0
µF
RSET
-
8.2
12
47
kΩ
Test Condition
Min
Typ
Max
Unit
2 time up converting
120
-
-
1.5 time up converting
120
-
-
Logic
R
S u p p l y
Test Condition
Input
Voltage
r e s i s t a n c e
S E T
Electrical Characteristics
DC-DC Regulator part (VIN=3.6V, Ta=25°C, if it is not specified.)
C h a r a c t e r i s t i c s
Symbol
Test
Circuits
Output Current Ability
IOUT(MAX)
1
1 time up converting
120
-
-
Consumption Current
IIN(ON)
2
EN=”H”, RSET=47kΩ
-
1
2
mA
Stand By Consumption Current
IIN(OFF)
2
EN=”L”
-
0
1
µA
VIH
3
EN, CTL0,CTL1,CTL2
VIN=2.8V~4.2V
0.7VIN
-
-
-
-
0.3VIN
Logic Input
V o l t a g e
Logic
T
O
T
i
g
h
V
w
VIL
3
EN,CTL0,CTL1,CTL2
VIN=2.8V~4.2V
Current
Ileak
3
EN,CTL0,CTL1,CTL2
-
-
0.1
µA
F r e q u e n c y
fOSC
4
-
-
1000
-
kHz
RON
1
1.5 time up converting
-
5
10
Ω
4
LED Vf=3.6V, RSET=12kΩ
VIN falling
-
4.0
-
V
Test Condition
Min
Typ
Max
Unit
RSET=47kΩ
RSET=12kΩ
RSET=8.2kΩ
RSET=8.2kΩ
VIN=3.6V center,VIN=2.8~4.2V
IOUT=80mA
EN="L"
−
−
5.1
19.6
28
0.61
2.5
5
−
−
−
1
−
%
−
−
1
µA
Input
C l o c k
H
mA
A
L
L
o
R
O
N
1X mode to 1.5X mode
transition voltage
VTRANS1X
Constant Current Driver part (VIN=3.6V, Ta=25°C, if it is not specified.)
Characteristics
Symbol
Test
Circuits
Constant Current Drive Setting
ILED1~4
5
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
5
5
5
5
5
5/18
mA
2007-06-21
V
%
%
TCA62735AFLG
Test Circuits
Test Circuit1: Output Current Ability, TOTAL RON
VIN=2.8V~4.2V
CIN=2.2µF
VIN
COUT=1.0µF
CTL2
C2+
CTL0
ILED4
GND
ILED1
CTL1
ILED2
C2-
ILED3
C2=1.0µF
EN
VOUT
RON=
V
ISET
C1-
VOUT
VIN
C1+
C1=1.0µF
V
A
↓
(VIN×1.5) - VOUT
IOUT=120mA
IOUT
Test Circuit2: Consumption Current, Stand By Consumption Current
VIN=3.6V
RSET=47kΩ
A
COUT=1.0µF
ISET
C1-
VOUT
VIN
C1+
C1=1.0µF
CTL2
CTL0
ILED1
C2+
ILED2
CTL1
ILED3
C2-
ILED4
C2=1.0µF
CIN=2.2µF
EN
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TCA62735AFLG
Test Circuit3: Logic Input Voltage, Logic Input Current
VIN=2.8V~4.2V
RSET=47kΩ
CIN=2.2µF
COUT=1.0µF
ISET
VOUT
VIN
C1+
C1=1.0µF
VIN(LOGIC)=0V∼4.2V
CTL2
A
C2-
CTL1
A
C2+
CTL0
A
EN
A
C1-
VIN(LOGIC)=0V∼4.2V
C2=1.0µF
VIN(LOGIC)=0V∼4.2V
ILED1
ILED2
ILED3
ILED4
VIN(LOGIC)=0V∼4.2V
V
V
V
V
Test Circuit4: Clock Frequency, 1X mode to 1.5X mode transition voltage
VIN=2.8V~4.2V
RSET=12kΩ
A
COUT=1.0µF
CTL0
GND
ILED1
C2+
ILED2
CTL1
ILED3
F
CTL2
C2-
ILED4
C2=1.0µF
ISET
C1-
VOUT
VIN
C1+
C1=1.0µF
CIN=2.2µF
V
EN
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TCA62735AFLG
Test Circuit5: Constant Current Drive Setting, ISET Terminal Output Voltage, Constant Current Accuracy
Test Circuit5: Constant Sink Current Supply Voltage Regulation, Output leakage current
RSET=47kΩ, 12kΩ, 8.2kΩ
V
VIN=2.8V~4.2V
CIN=2.2µF
COUT=1.0µF
CTL2
CTL0
ILED1
C2+
ILED2
CTL1
ILED3
C2-
ILED4
C2=1.0µF
ISET
C1-
VOUT
VIN
C1+
C1=1.0µF
A
A
A
A
EN
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TCA62735AFLG
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
90
50
40
30
20
10
0
Efficiency (%)
80
VIN=3.0V
VIN=3.3V
VIN=3.6V
LED Vf=3.3V
Ta=25°C
70
60
50
40
30
VIN=3.9V
20
VIN=4.2V
10
4LEDs at 20mA LED Vf=3.51V
Ta=25°C
0
0
20
40
60
80
IOUT (mA)
100
4.3
120
Quiescent Current vs. VIN
4.0
2.5
2.0
1.5
4LEDs at 30mA
4LEDs at 20mA
0.5
3.9
3.7
3.5 3.3
VIN (V)
3.1
2.9
2.7
VIN=2.7V
3.5
3.0
1.0
4.1
Quiescent Current vs. IOUT Current
4.0
Ta=25°C
3.5
Quiescent Current (mA)
Efficiency vs. VIN
100
Quiescent Current (mA)
Efficiency (%)
100
90
80
70
60
4LEDs at 5mA
0.0
VIN=3.6V
VIN=4.3V
3.0
2.5
2.0
1.5
1.0
0.5
Ta=25°C
0.0
2.8
3.0
3.2
3.4
3.6
VIN (V)
3.8
4.0
4.2
9/18
20
40
60
80
100
IOUT Current (mA)
2007-06-21
120
TCA62735AFLG
IOUT Current vs. VIN
160
4LEDs at 30mA
4LEDs at 20mA
4LEDs at 30mA
4LEDs at 20mA
35
Ta=25°C
4LEDs at 5mA
30
120
Ta=25°C
4LEDs at 5mA
ILED Current (mA)
IOUT Current (mA)
140
ILED Current vs. VIN
40
25
100
20
80
15
60
10
40
20
5
0
0
2.8
3.0
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
1x Mode Transition V oltage vs. ILED Current
4.1
Ta=25°C
VIN_transition voltage (V)
4.0
3.9
3.8
3.7
3.6
LED Vf=3.2V,4c h ON
3.5
LED Vf=3.4V,4c h ON
LED Vf=3.6V,4c h ON
3.4
5
10
15
20
ILED Current (mA )
Evaluation Circuit
25
30
VIN=2.8V~4.2V
RSET=8.2kΩ~47kΩ
A
COUT=1.0µF
C1-
CTL2
ILED1
CTL0
ILED2
C2+
ILED3
CTL1
ILED4
C2-
GND
CIN=2.2µF
ISET
VOUT
VIN
C1+
C1=1.0µF
C2=1.0µF
V
EN
V
A
10/18
• Evaluation conditions
LED
: NACW215 (NICHIA Corp.)
: C1608JB1C225K (TDK Corp.)
CIN
COUT
: C1608JB1C105K (TDK Corp.)
C1
: C1608JB1C105K (TDK Corp.)
C2
: C1608JB1C105K (TDK Corp.)
2007-06-21
4.2
TCA62735AFLG
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.
400 × 0.61[V]
ILED[mA] =
RSET[kΩ]
RSET vs ILED
35
30
ILED(mA)
25
20
15
10
5
0
0
5
10
15
20
25
RSET (kΩ)
30
RSET
35
40
45
50
VIN=2.8V~4.2V
CIN=2.2µF
COUT=1.0µF
CTL2
CTL0
GND
ILED1
C2+
ILED2
CTL1
ILED3
C2-
ILED4
C2=1.0µF
ISET
C1-
VOUT
VIN
C1+
C1=1.0µF
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EN
2007-06-21
TCA62735AFLG
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] × 400 × ON Duty[%]
RSET[kΩ]
fPWM will recommend 100Hz.
PWM Duty vs . IOUT
100
Ch1 : VPWM
IOUT (mA)
80
Ch2 : IIN
Ch3 : VOUT
60
40
20
Ch4 : IOUT
0
0
RSET=12kΩ
20
40
60
PWM Duty (%)
80
100
VIN=3.6V
CIN=2.2µF
COUT=1.0µF
CTL2
CTL0
GND
ILED1
C2+
ILED2
CTL1
ILED3
C2-
ILED4
C2=1.0µF
ISET
C1-
VOUT
VIN
C1+
C1=1.0µF
EN
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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TCA62735AFLG
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 αmA.
R1[kΩ] + R2[kΩ]
α[mA] = 0.61[V] ×
× 400
R1[kΩ] × R2[kΩ]
3. A minimum current is defined as βmA.
β[mA] = 0.61[V] ×
1
× 400
R2[kΩ]
4. ILED can be set according to the next expression.
β[mA] - α[mA]
ILED[mA] = VADJ[V] ×
0.61[V]
+ α[mA]
ILED vs. VADJ
25
ILED (mA)
20
15
10
5
0
0
0.2
0.4
0.6
VADJ (V)
VADJ=0V~0.61V
R2=47kΩ
VIN=2.8V~4.2V
R1=16kΩ
CIN=2.2µF
COUT=1.0µF
C1-
ISET
CTL2
CTL0
GND
ILED1
C2+
ILED2
CTL1
ILED3
C2-
ILED4
C2=1.0µF
VOUT
C1+
VIN
C1=1.0µF
EN
*This method is without repeating IC ON/OFF, and no need to consider holding rash current.
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TCA62735AFLG
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 × 0.61[V]
R[kΩ]
About combined resistance R[kΩ]
M1
M2
ON
ON
ON
OFF
OFF
ON
OFF
OFF
R[kΩ]
RSET[kΩ] × R1[kΩ] × R2[kΩ]
R1[kΩ]×RSET[kΩ]
+
R2[kΩ]×RSET[kΩ]
+ R1[kΩ]×R2[kΩ]
RSET[kΩ] × R1[kΩ]
RSET[kΩ] + R1[kΩ]
RSET[kΩ] × R2[kΩ]
RSET[kΩ] + R2[kΩ]
RSET[kΩ]
R2
M2
R1
M1
RSET
VIN=2.8V~4.2V
CIN=2.2µF
CTL2
CTL0
GND
ILED1
C2+
ILED2
CTL1
ILED3
C2-
ILED4
C2=1.0µF
VOUT
VIN
C1+
C1-
ISET
COUT=1.0µF
C1=1.0µF
EN
*This method is without repeating IC ON/OFF, and no need to consider holding rash current.
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TCA62735AFLG
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
Output
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
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 200µs 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 160°C. (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 µF to 10 µF, however larger than 2.2 µF 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 µF to 4.7 µF, however larger than 1.0 µF 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 µF to 2.2 µF, however larger than 1.0 µF
should be better.
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TCA62735AFLG
Package Dimensions
Unit : mm
VQFN16-P-0404-0.65
4.00Typ.
4.00Typ.
3.75Typ.
3.75Typ.
0.9MAX
+ 0.07
0.28 -
0.05
0.25MIN
+ 0.15
0.60 0.10
0.65Typ.
Weight: 0.016 g (Typ.)
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TCA62735AFLG
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.
2. Equivalent Circuits
The equivalent circuit diagrams may be simplified or some parts of them may be omitted for
explanatory purposes.
3. Timing Charts
Timing charts may be simplified for explanatory purposes.
4. Application Circuits
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.
5. Test 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.
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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