MARKTECH TB62752AFUG

TENTATIVE
TB62752AFUG
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 (IF) 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.
Weight: 0.016 g (Typ.)
Characteristics
•
2-8 white LEDs connected series (Typ. 7LEDs)
•
Variable LED Current IF is set with a external resistor :
•
Output Power : Available for 800mW LED loading
•
High Efficiency : 80% over (Using recommended external parts: Typ. 7LEDs)
•
Output Over Voltage Shutdown Function :
•
IC Package : SSOP6=p=0.95B
•
Switching Frequency : 1.1 MHz (Typ.)
20 mA (Typ.) @RSENS = 15 Ω
Switching Operation is shut downed when OVD terminal Voltage is over 37 V (typ.).
Pin Assignment (Top view)
SHDN
VIN
Caution 1:
W
OVD
FB
GND
SW
This IC could be destroyed in some case if amounted in 180° inverse direction.
Please be careful about IC direction in mounting.
Company Headquarters
3 Northway Lane North
Latham, New York 12110
Toll Free: 800.984.5337
Fax: 518.785.4725
Web: www.marktechopto.com | Email: [email protected]
California Sales Office:
950 South Coast Drive, Suite 225
Costa Mesa, California 92626
Toll Free: 800.984.5337
Fax: 714.850.9314
TB62752AFUG
TENTATIVE
Block Diagram
22µH
VIN
OVD
SW
VIN
PWM
Control
OSC
(1.1MHz)
Over Voltage
Detection
Reference
2.2µF
1.0µF
Current
Limit
Error
AMP.
SHDN
FB
300mV
Shutdown
Function
15Ω
@20mA
GND
Pin Function
Pin No.
Symbol
1
SHDN
2
OVD
Function Description
Voltage-Input Terminal for IC-Enable / Disable LED-IF.
IF adjustment with PWM input signal is also available.
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
6
FB
Ground Terminal.
LED IF Setting Resister Connecting Terminal.
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TB62752AFUG
TENTATIVE
Absolute Maximum Ratings (Topr = 25°C if without notice)
Characteristics
Symbol
Power Supply Voltage
Input Voltage
Switching Terminal Voltage
Switching Terminal Current
VIN
VSHDN
Vo (SW)
Io (SW)
Power Dissipation
PD
Thermal Resistance
Rth (j-a)
Operation Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Topr
Tstg
Tj
Caution 2:
Ratings
−0.3 to +6.0
−0.3 to +VIN + 0.3
-0.3 to 40
1500
0.41 (Device)
0.47 (on PCB) Caution 2
300 (Device)
260 (on PCB)
−40 to +85
−55 to +150
150
Unit
V
V
V
mA
W
°C/W
°C
°C
°C
Power Dissipation must be calculated with subtraction of 3.8 mW/°C from Maximum Rating
with every 1°C if Topr is upper 25°C. (on PCB)
Recommended Operating Condition (Ta = -40°C to 85°C if without notice)
Characteristics
Power Supply Voltage
LED Current (Average Value)
Electrical Characteristics
Test
Circuit
Symbol
VIN
Test Condition
-
Io1
-
VIN = 3.6 V, RSENS=15Ω
4LEDs, Topr = 25°C
Min
Typ
Max
Unit
2.8
-
5.5
V
-
20
-
mA
(Ta = 25°C, VIN=2.8V to 5.5V if without notice)
Characteristics
Symbol
Input Voltage Range
VIN
Operating Consumption Current
IIN (On)
Min
Typ
Max
Unit
2.8
-
5.5
V
VIN=3.6V, RSENS=15Ω
-
TBD
-
mA
Quiescent Consumption Current
IIN (Off)
VIN=3.6V,VSHDN=0V
-
0.5
1.0
µA
VSHDNH
-
1.3
-
VIN
V
VSHDNL
-
0
-
0.4
V
ISHDN
VIN=3.6V,VSHDN=3.6V
-
0
1.0
µA
Integrated MOS-Tr
Switching Frequency
fOSC
VIN=3.6V,VSHDN=3.6V
0.77
1.1
1.43
MHz
Switching Terminal Current
IoZ (SW)
-
-
600
-
mA
Switching Terminal Leak Current
Ioz (SW)
-
-
0.5
1
µA
FB Terminal Feedback Voltage
(VFB)
VFB
VIN=3.6V, RSENS=15Ω
Topr=25°C, L=22µH
285
300
315
mV
FB Terminal Line Regulation
∆VFB
VIN=3.6V center
VIN=3.0 to 5.0V
-5
-
5
%
FB Terminal Current
IoZ (SW)
-
-
TBD
-
µA
OVD terminal Voltage
VOVD
-
34.5
37
39.5
V
OVD Terminal Leakage Current
IOVDZ
VOVD=30V
-
0.5
1
µA
SHDN Terminal 'H' Level
Input Voltage
SHDN Terminal 'L' Level
Input Voltage
SHDN Terminal Current
Test Condition
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TENTATIVE
TB62752AFUG
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
C1 = Over 2.2 (µF), C2 = Over 1.0 (µF)
In case with PWM signal to SHDN terminal for brightness control, recommended values are
C1 = Over 4.7 (µF), C2=Under 0.1 (µF) 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 IO
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.
IF[mA] =
300[mV]
RSENS [Ω]
Current Value error is within ±5%.
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TB62752AFUG
Package Dimensions
Weight : 0.016 g (Typcal)
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TENTATIVE
TB62752AFUG
About solderability, following conditions were confirmed
• Solderability
(1) Use of Sn-63Pb 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
RESTRICTIONS ON PRODUCT USE
030619EBA
• 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.
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