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.
Characteristics
Fabricating with CMOS Process
Package : QFN16 (4mm
4mm 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)
Weight: 0.016 g (Typ.)
EN
CTL0
CTL1
CTL2
GND
C2+
C2
-
C1
-
ILED1
ILED2
ILED3
ILED4
ISET
VO
UT
VIN
C1+
30mA
V
IN
=2.8~4.2V
C
1
1.0F
C1
C1+
EN
CTL0
CTL1
CTL2
VIN
GND
C
2
1.0F
C
OUT
1.0F
C
IN
2.2F
R
SET
8k
ISET
30mA
30mA
30mA
ILED4
ILED3
ILED2
ILED1
VOUT
C2
C2+
Application Diagram
Web: www.marktechopto.com | Email: info@marktechopto.com
Company Headquarters
3 Northway Lane North
Latham, New York 12110
Toll Free: 800.984.5337
Fax:
518.785.4725
California Sales Office:
950 South Coast Drive, Suite 2
25
Costa Mesa, California 92626
Toll Free: 800.984.5337
Fax: 714.850.9314
TCA62735AFLG
TENTATIVE
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 2 of 12)
Block Diagram
Explanation of Terminals
No
Symbol
Function
1
EN
Logic input terminal. (input a chip enable signal)
EN = "H"
Operation mode, EN = "L" Shutdown mode
2
CTL0
3
CTL1
4
CTL2
Logic input terminal. (Selection of an output number)
Please refer to the truth table on page 10.
5
ISET
Resistance connection terminal for setting up output current.
6
VOUT
Output terminal.
7
VIN
Power supply terminal.
8
C1
+
9
C1
-
10
C2
-
11
C2
+
Capacitance connection terminal for charge pump.
12
GND
GND terminal.
13
ILED4
14
ILED3
15
ILED2
16
ILED1
Constant Sink Current Driver terminal.
ILED(mA) = 0.61V
400 / R
SET
(k)
ISET
Feed Back
GND
Constant Current
Regulator
ILED1
ILED 2
ILED 3
ILED 4
C1+
C1
-
VIN
VOUT
C2+
C2
-
Feed Back Circuit
Up Converting Time Change
CTL0
EN
CTL1
CTL2
Control
Logic
ON/OFF
TCA62735AFLG
TENTATIVE
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 3 of 12)
Absolute Maximum Ratings (T
opr
= 25
C if without notice)
Characteristics Symbol
Ratings
Unit
P o w e r S u p p l y V o l t a g e
V
IN
-0.3~+6.0 V
I n p u t V o l t a g e
V
in
-0.3~V
IN
+0.3(*1) mA
O u t p u t C u r r e n t I
OUT
200
mA/ch
O p e r a t i n g T e m p e r a t u r e T
opr
-40~+85 C
S t o r a g e T e m p e r a t u r e T
stg
-55~+150 C
J u n c t i o n T e m p e r a t u r e
T
j
150 C
*1 : please do not exceed 6V.
Recommended Operating Condition (T
opr
=-40C to 85C if without notice)
Characteristics Symbol
Test
Condition
Min
Typ
Max
Unit
P o w e r S u p p l y
V
IN
-
2.8
-
4.2
V
L o g i c I n p u t V o l t a g e
V
in
EN,CTL0,CTL1,CTL2 0 - V
IN
V
I n p u t R i p p l e V o l t a g e
V
IN(ripple)
-
- -
40
mVpp
Capacitance for Charge Pump
C
1
,C
2
-
0.8 1.0 2.2
F
C a p a c i t a n c e f o r o u t p u t
C
OUT
-
0.8 2.2 4.7
F
C a p a c i t a n c e f o r i n p u t
C
IN
-
0.8 2.2 10.0
F
R
S E T
r e s i s t a n c e
R
SET
-
2 8 80
k
Electrical Characteristics
DC-DC Regulator part (V
IN
=3.6V, T
opr
=-40 to 85C, if it is not specified.)
C h a r a c t e r i s t i c s Symbol
Test
Condition
Min
Typ
Max Unit
2 time up converting
120
-
-
1.5 time up converting
120
-
-
O u t p u t C u r r e n t A b i l i t y I
OUT(MAX)
1 time up converting
120
-
-
mA
C o n s u m p t i o n C u r r e n t
I
IN(ON)
I
OUT
=5mA -
1
2
mA
Stand By Consumption Current
I
IN(OFF)
I
OUT
=0mA
EN="L"
- 0 1
A
H
i
g
h
V
IH
EN, CTL0,CTL1,CTL2
V
IN
=2.8V to 4.2V
0.7V
IN
- -
L o g i c I n p u t
V o l t a g e
L
o
w
V
IL
EN,CTL0,CTL1,CTL2
V
IN
=2.8V to 4.2V
- -
0.3V
IN
V
L o g i c I n p u t C u r r e n t
I
leak
EN,CTL0,CTL1,CTL2 -
- 0.1
A
C l o c k F r e q u e n c y
f
OSC
- - 1000 -
kHz
T
O
T
A
L
R
O
N
R
ON
1.5 time up converting
-
5 10
1 X m o d e t o 1 . 5 X m o d e
t r a n s i t i o n v o l t a g e
V
TRANS1X
LED V
f
=3.6V,I
OUT
=80mA
V
IN
falling
- 4.0 -
V
TCA62735AFLG
TENTATIVE
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 4 of 12)
Constant Current Driver part
(V
IN
=2.8V to 4.2V, T
opr
=-40 to 85C, if it is not specified.)
Characteristics Symbol
Test
Condition
Min
Typ
Max
Unit
R
SET
=47k
-
5.1
-
R
SET
=12k
-
19.6
-
Constant Current Drive Setting
I
LED1~4
R
SET
=8.2k
-
28
-
mA
ISET Terminal Output Voltage
V
SET
R
SET
=8.2k
-
0.61
- V
Between Chs |I
LED-LED-ERR
|
-
-
2.5 - %
Constant Current
A c c u r a c y Between ICs |I
LED-ERR
|
-
-
5 - %
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
|I
LED
|
V
IN
=3.6V center
V
IN
=2.8 to 4.2V
I
OUT
=80mA
C
IN
=2.2
F
-
1
-
%
O u t p u t l e a k a g e c u r r e n t
I
LEAK1~4
EN="H"
ILED1 to4="OFF"
-
-
1
A
Reference data
Quiescent Current vs. IOUT Current
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
20
40
60
80
100
120
IOUT Current (mA)
Q
u
i
e
s
c
e
n
t
C
u
rre
n
t
(
m
A
)
VIN=2.7V
VIN=3.6V
VIN=4.3V
Efficiency vs. VIN
0
10
20
30
40
50
60
70
80
90
100
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
VIN (V)
Ef
f
i
ci
e
n
cy
(
%
)
4LEDs at 20mA LED Vf=3.51V
Quiescent Current vs. VIN
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
VIN (V)
Q
u
i
e
s
c
e
n
t
C
u
rre
n
t
(m
A
)
4LEDs at 30mA
4LEDs at 20mA
4LEDs at 5mA
Efficiency vs. IOUT
0
10
20
30
40
50
60
70
80
90
100
0
20
40
60
80
100
120
IOUT (mA)
E
f
f
i
ci
e
n
c
y (
%
)
VIN=3.0V
VIN=3.3V
VIN=3.6V
VIN=3.9V
VIN=4.2V
LED V
f
=3.3V
TCA62735AFLG
TENTATIVE
This datasheet is tentative, the values and contents are subject to change without any notice.
2005-04-26 (Page 5 of 12)
Evaluation Circuit
IOUT Current vs. VIN
0
20
40
60
80
100
120
140
160
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
VIN (V)
I
O
UT
Cu
r
r
e
n
t
(
m
A
)
4LEDs at 30mA
4LEDs at 20mA
4LEDs at 5mA
ILED Current vs. VIN
0
5
10
15
20
25
30
35
40
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
VIN (V)
IL
E
D
C
u
r
r
e
n
t
(
m
A
)
4LEDs at 30mA
4LEDs at 20mA
4LEDs at 5mA
1x Mode Transition Voltage vs. ILED Current
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
5
10
15
20
25
30
ILED Current (mA)
V
I
N
_
t
r
ans
i
t
i
on v
o
l
t
age
(
V
)
LED Vf=3.2V,4ch ON
LED Vf=3.4V,4ch ON
LED Vf=3.6V,4ch ON
C1-
C2-
C2+
CTL2
CTL1
CTL0
EN
ILED4
ILED3
ILED2
ILED1
R
SET
=8.2k to 47k
C
IN
=2.2
F
C
OUT
=1.0
F
C
1
=1.0
F
V
IN
=2.8V to 4.2V
C
2
=1.0
F
C1+
VIN
VO
UT
ISET
V
A
A
V
GND
Evaluation conditions
LED
: NACW215 (NICHIA Corp.)
C
IN
: C1608JB1C225K (TDK Corp.)
C
OUT
: C1608JB1C105K (TDK Corp.)
C
1
: C1608JB1C105K (TDK Corp.)
C
2
: C1608JB1C105K (TDK Corp.)
PDF 
ZIP