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Rohm Semiconductor Electronic Components Datasheet

BD9271KUT Datasheet

White LED Diver

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Datasheet
LED Drivers for LCD Backlights
White LED Diver for
Backlight of Medium/Large-sized LCDs
BD9271KUT
General Description
BD9271KUT is a white LED diver used on backlight of
Medium/Large-sized LCDs. This IC can achieve
dimming function by SPI control. And through the SPI
correspondence, it can set the ON/OFF of each switch,
analog dimming and etc. The signals of PWM dimming
can set the frequency, ON time and delay of PWM by
inputting the external signals to the register.
BD9271KUT has equipped several protection functions
to deal with the abnormal states, including LED OPEN
protection, LED SHORT protection, external current
setting resistance SHORT protection, external MOS
transistor SHORT protection, etc. So it can be used in a
wide output voltage range and various load conditions.
Key Specifications
VCC power supply range
DVDD power supply range
CLK frequency setting range
Operating Circuit current range
Operating temperature range
9.0V35.0V
3.0V3.6V
10010000kHz
2.4mA(typ.)
-40℃~+85
Applications
TV, PC display
Other LCD backlight
Typical Application Circuit
Features
16-ch constant current driver (external FET(NMOSis
equipped.)
LED voltage can be set externally.
PWM dimming and Analogue dimming can be
controlled by SPI.
LED Abnormal operation detection circuit (OPEN
protection/ SHORT protection) is equipped.
LED SHORT protection detection voltage is adjustable
(LSP terminal)
LED SHORT protection detection CH
FAIL INDICATION function is equipped by ERR_DET
terminal.
3 lines serial interface
Package: TQFP64U
Package
TQFP64U
Pin Pitch
W(Typ.) D(Typ.) H(Max.)
9.00mm×9.00mm×1.20mm
0.4mm
Figure 1. TQFP64U
Figure 2. Typical Application Circuit
Product structureSilicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays
1/34
TSZ02201-0F1F0C100260-1-2
22.Jul.2015 Rev.006


Rohm Semiconductor Electronic Components Datasheet

BD9271KUT Datasheet

White LED Diver

No Preview Available !

BD9271KUT
Datasheet
Absolute Maximum RatingsTa=25℃)
Parameter
Symbol
Ratings
Unit
Power Supply Voltage
VCC
36 V
Power Supply Voltage at digital part
DVDD
4.5 V
STB Terminal Voltage
VSTB
VCC
V
D116 Terminal Voltage
VD1VD16
40 V
ERR_DET Terminal Voltage
VERR_DET
VCC
V
S1S16, G1G16, VREF5V, LSP,
COMP1, COMP2 Terminal Voltage
CS, CLK, DI, DO, VSYNC, HSYNC Terminal
Voltage
Power Dissipation
VS1S16, VG1VG16,VREF5V,VLSP,
VCOMP1,VCOMP2
VCS,VCLK,VDI,VDO,VVSYNC,VHSYNC
Pd
7
4.5
1.37(Note 1)
V
V
W
Operating Temperature Range
Topr
-40+85
Storage temperature range
Tstg
-55+150
Junction temperature
Tjmax
150
(Note 1)When Ta = 25°C or higher, power dissipation is down with 11.0mW/°C (when a 70 mm x 70 mm x 16 mm 1-layer
glass epoxy board is mounted).
Operation rangeTa=25℃)
Parameter
Symbol
Limits
Unit
Power source voltage
VCC
9.035.0
V
Power Supply Voltage at digital part
DVDD
3.03.6
V
CLK oscillation frequency setting range
CLK
10010000
kHz
VSYNC input oscillation frequency range
VSYNC
80 1000
Hz
LSP terminal input voltage
VLSP
0.8 3.0
V
The operating ranges above are acquired by evaluating the IC separately. Please take care when set the IC in applications.
External Components Recommended Range
Parameter
Symbol
Range
Unit
VCC pin connection capacitance
CVCC
110
uF
VREF5V pin connection capacitance
CREF
0.110
uF
The operating ranges above are acquired by evaluating the IC separately. Please take care when set the IC in applications.
Block diagram
Package outline drawing
TQFP64U (TOP VIEW)
Marking
BD9271
Figure 3. Pin Configuration
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/34
Lot No.
1Pin Mark
Figure 4. Marking Diagram
TSZ02201-0F1F0C100260-1-2
22.Jul.2015 Rev.006


Part Number BD9271KUT
Description White LED Diver
Maker ROHM
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