Tentative
TB62750FTG
TOSHIBA BiCD Digital INTEGRATED CIRCIUTS SILICON MONOLITHIC
TB62750FTG
Step-up type DC/DC Converter for White LED
Development specification
TOSHIBA MICROELECTRONICS CORP.
APPLICATION ENGINEERING GROUP 3
Data Sheet
Version No.
0.10
0.20
Data
2004-11-27
2005-3-31
NEW
External parts value refine
Note
Charge
Kobayashi
Kobayashi
0
28-Apr-05 (Rev0.2) TB627350FTG (Page. /11)
Tentative
TB62750FTG
TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic
TB62750FTG
Step Up Type DC-DC Converter for White LED
TB62750FTG 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 white LEDs whose constant output current is 800mA
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.
This IC is the most suitable as a driver of camera flashes and strobes in
the cellular phone, the PDA, the DSC, and other mobiles.
■
Features
・Switching
terminal current
・Maximum
output power
・Maximum
output voltage
・Operating
frequency
・Four
operating modes
Light mode
Flash mode
・High
efficiency
:ILED=350mA(Typ.) (R3=8.2kΩ,R2=62kΩ)
:ILED=800mA(Typ.) (RSENS=0.375Ω)
:Maximum efficiency : 80%(In the flash mode)
Application
VIN(3.0½4.2)
L
S-Di
:1.8A(Typ.)
:
:10V
:2MHz
（
ＶQON24-0404-0.65
）
Weight：
0.09g
現品表示 ；
(Typ.)
Shutdown mode :Icc=0.01µA(Typ.)
Cin
OVP
Cout
VIN
SW1SW2 SW3
K1
K2
K3
800mA (TYP)
EN2
EN1
SS
Css
PGND1
PGND3
GND
PGND2
IL
RSENS1
RSENS2
RSENS3
FB+
FB-
R3
R4
R2
1
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■
Pin
TB62750FTG
Assignment (top view)
PGND1
17
PGND2
PGND3
18
OVP
EN2
EN1
AGND
VIN
NC
SW1
16
SW2
SW3
14
15
13
12 SS
11 IL
10 NC
9 NC
8 FB-
7 FB+
19
20
21
22
23
24
1
K3
2
RSENS3
3
K2
4
RSENS2
2
5
K1
6
RSENS1
28-Apr-05 (Rev0.2) TB627350FTG (Page. /11)
Tentative
■
Block Diagram
L
VIN
Cin
VIN
23
OVP
14
16
18
S-Di
TB62750FTG
Cout
19
SW1
SW3
SW2
K1
EN2
EN1
IL
R2
SS
Css
20
21
11
FB+
12
AGND
22
17
15
13
PGND1 PGND2 PGND3
FB-
8
7
R3
6
RSENS2
RSENS1
4
R1
RSENS3
2
K2
K3
5
3
1
3
28-Apr-05 (Rev0.2) TB627350FTG (Page. /11)
Tentative
■
Explanation of the Terminal
No.
Symbol
Function
TB62750FTG
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
K3
RSENS3
K2
RSENS2
K1
RSENS1
FB+
FB-
NC
NC
IL
SS
PGND3
SW3
PGND2
SW2
PGND1
SW1
OVP
EN2
Connected to the LED cathode.
Connected to the current-setting resistor: R1 for the flash.
Connected to the LED cathode.
Connected to the current-setting resistor: R1 for the flash.
Connected to the LED cathode.
Connected to the current-setting resistor: R1 for the flash.
Detecting the voltage of the current-setting resistor: R1 for the flash. It can change
the light-mode-current with the resistor: R3 which is connected to FB+.
No Connect
No Connect
Connected to the ILED setting resistor: R2 in the light mode.
The light-mode-current is changed depending on the setting ratio of R2 and R3.
Setting the constant to limit the current when DC-DC operation starts.
The rising time is changed depending on the constant of the condenser.
Ground terminal for the power device.
Switching the DC-DC converter. Nch MOSFET is built-in.
Ground terminal for the power device.
Switching the DC-DC converter. Nch MOSFET is built-in.
Ground terminal for the power device.
Switching the DC-DC converter. Nch MOSFET is built-in.
Detecting the over-voltage.
Inputting the logic signals which set the modes.
"ON"
"OFF"
:Flash mode
:Lighting mode
:DC-DC operation
21
EN1
Inputting the logic signals which set the modes.
"ON"
"OFF" :Stop
22
23
24
AGND
VIN
NC
Ground terminal for analog.
Inputting the power supply voltage to the IC. The operating voltage is 2.8 to 5.5V.
No Connect
4
28-Apr-05 (Rev0.2) TB627350FTG (Page. /11)
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