TB62752AFUG
TENTATIVE
TOSHIBA BiCD Digital Integrated Circuit Silicon Monolithic
TB62752AFUG
Step Up Type DC/DC Converter for White LED
Features
The TB62752AFUG is a high efficient Step-Up Type DC/DC
Converter specially designed for constant current driving of White
LED.
This IC can drive 2-8 white LEDs connected series using a Li-ion
battery.
This IC contains N-ch MOS-FET Transistor for Coil-Switching, and
LED Current (I
F
) is set with an external resistor.
This IC is especially for driving back light white LEDs in LCD of PDA,
Cellular Phone, or Handy Terminal Equipment.
Characteristics
2-8 white LEDs connected series (Typ. 7LEDs)
Variable LED Current I
F
is set with a external resistor :
20 mA (Typ.) @RSENS = 15
Output Power : Available for 800mW LED loading
High Efficiency : 80% over (Using recommended external parts: Typ. 7LEDs)
Output Over Voltage Shutdown Function :
Switching Operation is shut downed when OVD terminal Voltage is over 37 V (typ.).
IC Package : SSOP6=p=0.95B
Switching Frequency : 1.1 MHz (Typ.)
Pin Assignment
(Top view)
Caution 1:
This IC could be destroyed in some case if amounted in 180 inverse direction.
Please be careful about IC direction in mounting.
Weight: 0.016 g (Typ.)
SHDN
OVD
VIN
FB
GND
SW
W
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
TB62752AFUG
2005-08-5
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Block Diagram
Pin Function
Pin No.
Symbol
Function Description
1
SHDN
Voltage-Input Terminal for IC-Enable / Disable LED-I
F
.
I
F
adjustment with PWM input signal is also available.
2 OVD
Over Voltage Detection Terminal.
IC Switching Operation is disabled with detection over voltage.
If the voltage returns to detection level or less, Operation is enabled again.
3
VIN
Supply Voltage Input Terminal. ( 2.8V to 5.5V)
4
SW
Switch Terminal for DC/DC Converter. Nch MOSFET Built-In.
5 GND
Ground
Terminal.
6 FB
LED
I
F
Setting Resister Connecting Terminal.
Error
AMP.
PWM
Control
OSC
(1.1MHz)
VIN
SW
OVD
FB
SHDN
22H
1.0F
2.2F
VIN
15
@20mA
GND
300mV
Current
Limit
Shutdown
Function
Reference
Over Voltage
Detection
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Absolute Maximum Ratings (Topr = 25C if without notice)
Characteristics Symbol Ratings Unit
Power Supply Voltage
VIN
-0.3 to +6.0 V
Input Voltage
VSHDN
-0.3 to +VIN + 0.3
V
Switching Terminal Voltage
Vo (SW)
-0.3 to 40
V
Switching Terminal Current
Io (SW)
1500
mA
0.41 (Device)
Power Dissipation
PD
0.47 (on PCB) Caution 2
W
300 (Device)
Thermal Resistance
Rth (j-a)
260 (on PCB)
C/W
Operation Temperature Range
Topr
-40 to +85 C
Storage Temperature Range
Tstg
-55 to +150 C
Maximum Junction Temperature
Tj
150
C
Caution 2:
Power Dissipation must be calculated with subtraction of 3.8 mW/C from Maximum Rating
with every 1C if T
opr
is upper 25C. (on PCB)
Recommended Operating Condition
(Ta
=
-40C to 85C if without notice)
Characteristics Symbol
Test
Circuit
Test Condition
Min
Typ
Max
Unit
Power
Supply
Voltage
VIN
-
2.8 - 5.5 V
LED Current (Average Value)
Io1
-
VIN
= 3.6 V, RSENS=15
4LEDs, Topr = 25
C
- 20 - mA
Electrical Characteristics (Ta
=
25C, V
IN
=2.8V to 5.5V if without notice)
Characteristics Symbol Test
Condition Min
Typ
Max
Unit
Input Voltage Range
V
IN
2.8
-
5.5
V
Operating Consumption Current
I
IN
(On)
VIN=3.6V, RSENS=15 -
TBD
-
mA
Quiescent Consumption Current
I
IN
(Off)
VIN=3.6V,V
SHDN
=0V -
0.5
1.0
A
SHDN Terminal 'H' Level
Input Voltage
VSHDNH - 1.3
-
VIN
V
SHDN Terminal 'L' Level
Input Voltage
VSHDNL - 0
-
0.4
V
SHDN Terminal Current
I
SHDN
VIN=3.6V,V
SHDN
=3.6V -
0
1.0
A
Integrated MOS-Tr
Switching Frequency
f
OSC
VIN=3.6V,V
SHDN
=3.6V 0.77
1.1
1.43
MHz
Switching Terminal Current
I
oZ
(SW)
-
-
600
-
mA
Switching Terminal Leak Current
I
oz
(SW)
-
-
0.5
1
A
FB Terminal Feedback Voltage
(V
FB
)
V
FB
V
IN
=3.6V, RSENS=15
T
opr
=25
C, L=22H
285 300 315
mV
FB Terminal Line Regulation
V
FB
V
IN
=3.6V center
V
IN
=3.0 to 5.0V
-5 - 5 %
FB Terminal Current
I
oZ
(SW)
-
-
TBD
-
A
OVD terminal Voltage
V
OVD
-
34.5
37
39.5
V
OVD Terminal Leakage Current
I
OVDZ
V
OVD
=30V -
0.5
1
A
TB62752AFUG
2005-08-5
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TENTATIVE
Protection in LED opened condition
The operation with OVD terminal is available for the protection in case LED Circuit opened.
Please see the example of application circuit.
If load of LED is detached, Nch MOS switching operation is disabled with detection of boost circuit voltage.
Setting of external Capacitor
In case not using PWM signal to SHDN terminal for brightness control, recommended values are
C
1
= Over 2.2 (F), C
2
= Over 1.0 (F)
In case with PWM signal to SHDN terminal for brightness control, recommended values are
C
1
= Over 4.7 (F), C
2
=Under 0.1 (F) to reduce fluctuation of input current
and up accuracy of brightness.
The recommended capacitor values depend on the Brightness Control Method.
<Please see after page-8>
The capacitor value must be considered for gain enough accuracy of brightness with reduction of noise from
Input current changing.
Setting of I
O
Resistance connects between RSENS pin and GND.
The average current is set by this RSENS value and average current are obtained by the following equation.
I
F
[mA] =
Current Value error is within 5%.
300[mV]
RSENS [
]
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Package Dimensions
Weight : 0.016 g (Typcal)
TB62752AFUG
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TENTATIVE
The information contained herein is subject to change without notice.
The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of
TOSHIBA or others.
TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability
Handbook" etc..
The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this
document shall be made at the customer's own risk.
The products described in this document are subject to the foreign exchange and foreign trade laws.
TOSHIBA products should not be embedded to the downstream products which are prohibited to be produced
and sold, under any law and regulations.
030619EBA
RESTRICTIONS ON PRODUCT USE
About solderability, following conditions were confirmed
Solderability
(1) Use of Sn-63Pb solder Bath
solder bath temperature
= 230C
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
= 245C
dipping time
= 5 seconds
the number of times
= once
use of R-type flux
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