TOSHIBA
TB62734FMG
TOSHIBA BiCD Digital Silicon Monolithic Integrated Circuit
TB62734FMG
Step Up Type DC DC Converter for White LED
Features
TB62734FMG is the high efficient STEP-UP type
DC/DC converter by which the optimal design was
carried out at constant current driver of white LED.
It is possible to drive 2 ~ 6 white LEDs which connected
in series by the lithium ion battery. This IC contains the
Nch-MOS transistor required for switching of external inductor.
The forward current of LED is set up by the external
resistor. As the brightness control function, an analog
voltage input and a pulse input system (PWM) are possible.
The switching frequency is fixed at around 1.0Mhz.
This IC is the most suitable as a driver of white LED back
lighting of the color LCD in the PDA, the cellular phone
and the handy terminal machine.
Characteristics
Brightness control function : LED forward current 30~100%
Maximum output voltage : over 26V
Variable of the LED current by external resistance
20mA(TYP.) @ RSENS=7.5
Output power : 500 mW
Package : SON8-P-0.65 (Typical Height : 0.8mm)
High efficiency : 85% (Recommended parts in use)
Low resistance power MOS include
Ron=0.7
(TYP.) @ Vin=2.8~5.5V
Over voltage detection includes
Protection Voltage : OVD pin =20V (TYP.)
Note 1) This IC has the terminal (3 pin : HBM spec <
1.5kV) which is marginal
for ESD. The careful caution must be required for all handling stage.
And also, this device must be assembled in correct position, in case of
Assembled in the wrong direction, this IC might be destroyed.
Note 2) In case the control pin is open, unstable operation of the output should be caused.
Therefore, this control terminal must be fixed to the certain logic level.
Note 3) About solder ability, following conditions were confirmed
Solder ability
(1)Use of Sn-63Pd solder Bath
solder bath temperature = 230
C, dipping time = 5 seconds, the number of times = once, use of R-type flux
(2)Use of Sn-3.0Ag-0.5Cu solder Bath
solder bath temperature = 245
C, dipping time = 5 seconds, the number of times = once, use of R-type flux
VCC
CTL
OVD
A
K
RSENS
GND
PGND
B
2
6
B 3 6
Weight : 0.016g (Typical)
SON8-P-0.65
TB62734FMG
Company Headquarters
3 Northway Lane North
Latham, New York 12110
Toll Free: 800.984.5337
Fax:
518.785.4725
Web: www.marktechopto.com | Email: info@marktechopto.com
California Sales Office:
950 South Coast Drive, Suite 265
Costa Mesa, California 92626
Toll Free: 800.984.5337
Fax: 714.850.9314
Company Headquarters
3 Northway Lane North
Latham, New York 12110
Toll Free: 800.984.5337
Fax:
518.785.4725
Web: www.marktechopto.com | Email: info@marktechopto.com
California Sales Office:
950 South Coast Drive, Suite 265
Costa Mesa, California 92626
Toll Free: 800.984.5337
Fax: 714.850.9314
TOSHIBA
TB62734FMG
2/11
Block Diagram
Explanation of the terminal
No
Symbol
Function
1
VCC
Supply voltage pin. Supply voltage range : 2.8V to 5.5V
2
CTL
Input pin for IC ON/OFF control and variable LED Io.
0 to 0.4V : Shutdown Mode (IC shutdown)
1.0V to 2.5V : Io = 30 to 100% Variable (Linear Control)
Over 2.6V : Io = 100%
3
OVD
Feed-buck pin for output voltage
4
A
Sink driver pin for step- up DC-DC converter
5
PGND
Ground pin for power line
6
GND
Ground pin
7
RSENS
Resistance connects pin for LED Io setup.
8
K
Connected to the cathode of LED
*Please connect PGND and GND pin to the ground.
2.2 - 10 uH
V
CC
A
CTL
K
OVD
Vin
33us min.
Range
1.0 - 2.5 V
2
5
3
8
4
RSENS
6
7
V
ref
V
th
One
Shot
One
Shot
10k
PGND
GND
ADC
1
Vref=164mV
3.3
@Io=40mA
8.2
@Io=20mA
C2=0.47uF
TOSHIBA
TB62734FMG
3/11
Timing Chart
I A( peak )
LED Vo
OSC = 1.0 MHz
2.6V
1.0V
By controlling I A( peak )
Stabilized Io that is set
(Vctl > 2.6V , No Brightness Control Function by CTL)
A Terminal Voltage
A Terminal Current
(External Inductor)
CTL Terminal Current
TOSHIBA
TB62734FMG
4/11
Absolute Maximum Ratings (Topr = 25
C If not specified)
Item
Symbol
Ratings
Unit
Power supply
Voltage
Vcc
- 0.3 to + 6.0
V
Input Voltage
Vin
- 0.3 to + VCC + 0.3
V
Switching Terminal
Voltage
Vo(A)
- 0.3 to + 24
V
OVD Voltage
V(ovd)
- 0.3 to + 18
V
0.41 (Device)
Power Dissipation
Pd
0.47 (With PCB) Note1
W
Rth(j-a)1
300 (Device)
Thermal Resistance
Rth(j-a)2
260 (With PCB)
C/W
Operating
Temperature range
Topr
- 40 to + 85
Storage Temperature
Tstg
- 40 to + 150
Maximum Junction
Temperature
Tj
125
C
Note 1 : When every time the ambient temperature gets over 25 C with 1 C, the allowable loss must reduce
3.8mW/C more than maximum rated value. ( When on PCB.)
Recommended Operating Condition (Topr = -40 to 85
C If not Specified)
Item
Symbol
Measurement Condition
Min. Typ.
Max.
Unit
Power Supply
Voltage
Vcc
-
2.8
-
5.5
V
CTL Terminal
H level Input
Voltage
Vctl H
-
VCC
-0.5
-
VCC
CTL Terminal
L Level Input
Voltage
Vctl L
-
0
-
0.4
V
Io1
VCC=3.6V, RSENS=7.5
6 LED, Topr=25
C,
-
20
-
mA
Io2
VCC=3.6V, RSENS=7.5
4 LED, Topr=25
C
-
20
-
mA
LED Current
(Average Value)
Io3
VCC=3.6V, RSENS=3.3
3 LED, Topr=25
C
-
40
-
mA
TOSHIBA
TB62734FMG
5/11
Electrical Characteristics (Topr=-40 to 85
C, Vcc=2.8 to 5.5V, If not Specified)
Item
Symbol
Measurement Condition
Min.
Typ.
Max.
Unit
Operating
Consumption Current
Icc(On)
Vcc=3.6V, RSENS=8.2
-
0.9
1.5
mA
Quiescent
Consumption Current
Icc(Off)
Vcc=3.6V, VCTL=0V
-
0.5
1.0
uA
CTL Terminal Current I_CTL
Vcc=3.0V, VCTL=3V
+/-
7
+/-
12
+/-
21
uA
Integrated
MOS-Tr
ON Resistance
Ron
Io(A)= greater than 400mA
0.7
1.5
Integrated
MOS-Tr
Switching Frequency
fOSC
Vcc=3.6V, Vctl=3.0V
Topr=25
C
0.75
1.0
1.39
MHz
A Terminal Protection
Voltage
Vo(A)
6 Series white LED are also
driven
24
26
-
V
Switching Terminal
Current
Io(A)
-
-
600
-
mA
Switching Terminal
Leakage Current
Ioz(A)
Vo(A)=22V
-
0.5
1
uA
OVD Terminal
Voltage
Vovd
-
19
21
23
V
OVD Terminal
Leakage Current
Ioz(ovd)
Vovd=18V
-
0.5
1
uA
LED Current
(Average Value)
Io2
VCC=3.6V, RSENS=7.5
Topr=25
C, L=6.8uH
18
20
22
mA
TOSHIBA
TB62734FMG
6/11
[Setting of capacitance of output side]
The larger than C2=0.47(uF) should be recommended.
[Setting of external Inductor size]
Reference) According to the number of LED, the inductor size should be selected larger than the value
indicated in the table.
Number of LED
Vin=2.8V
Vin=4.3V
Note
2
3
4.7
3.6
4
6.8
4.7
5
8.1
6.8
6
10
8.1
Io=20mA
Unit : uH
[Setting of Io]
Resistance connects between RSENS pin and GND.
The resistor of RSENS (K terminal and Ground) is for setting of output current (Io).
The average current is set by this RSENS value and average current are obtained by the following equation.
(Please choose a equation according to the number of LED)
2LED : Io = 119.16 Rsens
-0.8399
3LED : Io = 115.32 Rsens
-0.854
4LED : Io = 113.08 Rsens
-0.8614
5LED : Io = 108.02 Rsens
-0.8534
6LED : Io = 106.71 Rsens
-0.836
It is an equation when setting up by inductor of the size which we recommend.
When different L from the size which we recommend is used, The average current cannot be computed with
the above-mentioned equation.
RSENS vs Iout
Vin=3.6V
10
15
20
25
30
35
40
45
50
0
2
4
6
8
10
12
RSENS()
I
out
(
m
A
)
2LED
3LED
4LED
5LED
6LED
TOSHIBA
TB62734FMG
7/11
[Current control by CTL pin]
This IC can carry out variable of the Io current by external resistance.Variable range : 30 to 100%
CTL Voltage
VCTL=0V to 0.4V
VCTL=1V to2.5V
VCTL>2.5V
Note
Io Valuable Rate
0
30 - 100
100
Unit : %
The tole rance of linearity when converting V-A is expecting to be +/- 10%.
CTL Input - Output Rate / Output Current
Vin=3.0V
0
20
40
60
80
100
1.0
1.5
2.0
2.5
VCTL (V)
Ra
te
(
%
)
0
5
10
15
20
25
Io
(
m
A
)
Io Rate
Io
TOSHIBA
TB62734FMG
8/11
RSENS=7.5
2 LED Drive
: L=4.7uH
3 to 5 LED Drive
: L=6.8uH
6 LED Drive
: L=10uH
Vcc
A
Vin =
2.8 to
5
.
5
V
ODV
CTL
K
PGND
GND
RSENS
C
2
=
1
.
0uF
TB62734FMG
C1
=
2.
2
F
S-Di
L
(1) The example of Application Circuit and Measurement data : Inductor 1001AS Series (Toko)
<Measurement Data>
Efficiency in the range of Vin=2.8 to 5.5V
Efficiency
(%)
Average
Efficiency(%)
2 LED
87.25 to 91.90
90.00
3 LED
85.04 to 88.75
87.24
4 LED
83.18 to 86.95
85.50
5 LED
81.15 to 85.36
83.93
6 LED
82.11 to 85.87
84.35
Output Current in the range of Vin=2.8 to 5.5V
Output Current
(mA)
Tolerance (%)
2 LED
20.90 to 23.96
14.65 (5.87)
3 LED
20.80 to 22.62
8.77 (3.88)
4 LED
20.18 to 21.78
7.89 (3.66)
5 LED
19.82 to 21.34
7.67 (3.47)
6 LED
19.95 to 21.40
7.26 (3.22)
( ) : renge of Vin=3.0 to 4.3 V
L
: 1001AS Series (Size 3.83.81.2mm)
S-Di : CUS02 1A/30V (TOSHIBA)
LED : NSCW215T (NICHIA)
Input - Efficiency / Output Current
2 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
f
f
i
c
i
enc
y
(%
)
Io
Efficiency
Input - Efficiency / Output Current
3 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
4 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
5 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
f
f
i
c
i
enc
y
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
6 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy (
%
)
Io
Efficiency
TOSHIBA
TB62734FMG
9/11
RSENS=7.5
2 LED Drive
: L=4.7uH
3 to 5 LED Drive
: L=6.8uH
6 LED Drive
: L=10uH
Vcc
A
V
i
n =
2
.
8 t
o
5.
5
V
ODV
CTL
K
PGND
GND
RSENS
C2 = 1.0u
F
TB62734FMG
C
1
=
2.
2
F
S-Di
L
(2) example of Application Circuit and Measurement data : Inductor CXLD120 Series (Sumitomo)
<Measurement Data>
Efficiency in the range of Vin=2.8 to 5.5V
Efficiency(%)
Average
Efficiency (%)
2 LED
87.34 to 91.82
89.87
3 LED
85.46 to 89.50
87.81
4 LED
84.22 to 87.99
86.33
5 LED
81.65 to 86.49
84.84
6 LED
83.53 to 87.63
86.15
Output Current in the range of Vin=2.8 to 5.5V
Output Current
(mA)
Tolerance (%)
2 LED
20.93 to 24.06
14.95 (6.01)
3 LED
20.69 to 22.56
9.02 (3.96)
4 LED
20.22 to 21.77
7.66 (3.49)
5 LED
19.78 to 21.30
7.69 (3.51)
6 LED
20.28 to 21.55
6.28 (2.71)
( ) : renge of Vin=3.0 to 4.3 V
L
: 1001AS Series (Size3.02.651.20mm)
S-Di : CUS02 1A/30V (TOSHIBA)
LED : NSCW215T (NICHIA)
Input - Efficiency / Output Current
2 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
f
f
i
c
i
enc
y
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
3 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
f
f
i
c
i
enc
y
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
4 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
5 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
6 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
f
f
i
c
i
enc
y
(
%
)
Io
Efficiency
TOSHIBA
TB62734FMG
10/11
RSENS=7.5
2 LEDDrive
: L=4.7uH
3 to 5 LED Drive
: L=6.8uH
6 LED Drive
: L=10uH
Vcc
A
V
i
n =
2
.
8 to
5.5
V
ODV
CTL
K
PGND
GND
RSENS
C
2
=
1.
0u
F
TB62734FMG
C1 = 2.2F
S-Di
L
(3) The example of Application Circuit and Measurement data : Inductor VLF3010 Series (TDK)
L
: VLF3010 Series (Size3.03.01.0mm)
S-Di : CUS02 1A/30V (TOSHIBA)
LED : NSCW215T (NICHIA)
<Measurement Data>
Efficiency in the range of Vin=2.8 to 5.5V
Efficiency(%)
Average
Efficiency (%)
2 LED
85.70 to 90.39
88.47
3 LED
84.51 to 88.15
86.76
4 LED
83.06 to 86.97
85.30
5 LED
80.94 to 85.78
84.07
6 LED
82.28 to 86.85
85.11
Output Current in the range of Vin=2.8 to 5.5V
Output Current
(mA)
Tolerance (%)
2 LED
21.00 to 24.01
14.35 (5.53)
3 LED
20.57 to 22.48
9.27 (4.06)
4 LED
20.03 to 21.69
8.24 (3.74)
5 LED
19.44 to 21.14
8.75 (4.07)
6 LED
19.96 to 21.46
7.52 (3.40)
( ) : renge of Vin=3.0 to 4.3 V
Input - Efficiency / Output Current
2 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
f
f
i
c
i
enc
y
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
3 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
4 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
5 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
6 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
ffi
ci
e
n
c
y
(
%
)
Io
Efficiency
TOSHIBA
TB62734FMG
11/11
RSENS=7.5
2 to 6 LED Drive
: L=15uH
Vcc
A
Vin
= 2.8
to 5.5
V
ODV
CTL
K
PGND
GND
RSENS
C
2
=
1.
0u
F
TB62734FMG
C1 = 2.2F
S-Di
L
(3) The example of Application Circuit and Measurement data : Inductor CXML322509-150 (Sumitomo)
<Measurement Data>
Efficiency in the range of Vin=2.8 to 5.5V
Efficiency(%)
Average
Efficiency (%)
2 LED
88.75 to 91.85
90.07
3 LED
86.77 to 88.22
87.13
4 LED
84.00 to 85.65
84.71
5 LED
82.13 to 84.38
83.34
6 LED
80.39 to 82.92
81.98
Output Current in the range of Vin=2.8 to 5.5V
Output Current
(mA)
Tolerance (%)
2 LED
22.00 to 24.04
9.30 (3.85)
3 LED
21.39 to 23.00
7.49 (3.56)
4 LED
20.82 to 22.41
7.61 (3.65)
5 LED
20.39 to 21.99
7.82 (3.75)
6 LED
19.84 to 21.57
8.69 (4.26)
( ) : renge of Vin=3.0 to 4.3 V
L :
CXML322509-150
(Size3.22.50.9mm)
S-Di : CUS02 1A/30V (TOSHIBA)
LED :
NSCW215T
(NICHIA)
Input - Efficiency / Output Current
2 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
3 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A)
80
85
90
95
100
E
f
f
i
ci
e
n
cy
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
4 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
ffi
ci
e
n
c
y
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
5 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
ffi
ci
e
n
c
y
(
%
)
Io
Efficiency
Input - Efficiency / Output Current
6 LED Drive
15
20
25
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Vin (V)
Io
(
m
A
)
80
85
90
95
100
E
ffi
ci
e
n
c
y
(
%
)
Io
Efficiency
TOSHIBA
TB62734FMG
12/11
Package (Dimensions)
Unit : mm
TOSHIBA
TB62734FMG
13/11
Marking
XXX
B36
Product
Name
Weekly Code
Ass'ly Code
1 PIN
XXXX
B36
1'st Half
od year
(1 to 26 week)
2'nd Half
of year
(27 to 53 week)
TOSHIBA
TB62734FMG
14/11
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