ROHM BD1206GUL Technical data
LED Drivers for LCD Backlights
Backlight LED Driver
for Small LCD Panels (Charge Pump Type)
BD1206GUL
●Description
BD1206GUL is 5ch or 6ch parallel LED driver for the portable instruments.
This IC is equipped with an automatic transition charge pump and 16-step LED drivers. Hence this IC realizes high efficiency
and high accuracy drive of LEDs. Additionally, this IC can synchronize LED drive with external PWM signal. This IC is best
suited to turn on white LEDs that require high-accuracy LED brightness control.
●Features
1) 5ch or 6ch parallel LED driver is mounted
2) 16-step LED current adjust function
3) LED current matching is 5% or less
4) Driving control via a single-line digital control interface
5) Automatic transition charge pump type DC/DC converter (×1, ×1.5, ×2)
6) High efficiency achieved (Maximum over 93%)
7) It transits for the most suitable power operating by the LED terminal process of the 6th light when only 5 lights driving
8) Various protection functions such as output voltage protection and thermal shutdown circuit are mounted.
9) The input external PWM is possible and the back light control interlocked with the motion picture is possible.
10) Package: VCSP50L2 (Thick 0.55mm MAX, Pin pitch 0.5mm) CSP15pin package
●Absolute Maximum Ratings (Ta=25ºC)
Parameter Symbol Ratings Unit
Power supply voltage VMAX 7 V
No.10040EAT08
Input voltage ( EN , PWMIN ) Vdin GND-0.3 ~ VBAT+0.3 V
Power dissipation Pd 900 mW
Operating temperature range Topr -30 ~ +85 ºC
Storage temperature range Tstg -55 ~ +150 ºC
(Note) Power dissipation deleting is 7.2mW/ ºC, when it’s used in over 25 ºC.(It’s deleting is on the board that is ROHM’s standard)
Dissipation by LSI should not exceed tolerance level of Pd.
●Operating Conditions (Ta = -30 ~ 85
Parameter Symbol Limits Unit
Operating power supply voltage VBAT 2.7 ~ 5.5 V
*This chip is not designed to protect itself against radioactive rays.
*This material may be changed on its way to designing.
*This material is not the official specification.
o
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BD1206GUL
●Electrical Characteristics (Unless otherwise noted, Ta = +25oC, VBAT=3.6V)
Parameter Symbol
Current Consumption
Quiescent Current Iq - 0.1 1 μA EN=0V
Current Consumption1 Idd1 - 62 64 mA
Current Consumption2 Idd2 - 123 126 mA
Charge Pump
Oscillator frequency fOSC 0.56 0.85 1.14 MHz
Current Source
LED maximum current ILED-max 18 20 22 mA VBAT≥3.2V
LED current accuracy ILED-diff - - 10.0 %
LED current matching ILED-match - 0.5 5.0 %
LED control voltage VLED - 0.15 0.25 V
Logic control terminal
Min. Typ. Max.
Limits
Units Condition
x 1.0 Mode
Include LED current (60mA)
x 2.0 Mode
Include LED current (60mA)
LED current setting is 10.0mA,
LED terminal voltage is 1.0V
LED current setting is 10.0mA,
LED terminal voltage is 1.0V
Minimum voltage from LED1 to LED6
pins
Technical Note
Low threshold voltage VIL - - 0.4 V EN, PWMIN
High threshold voltage VIH 1.4 - - V EN, PWMIN
High level Input current IIH - 0 1 μA EN = VBAT, PWMIN = VBAT
Low level Input current IIL -1 0 - μA EN = 0V, PWMIN = 0V
Minimum EN High time THI 0.05 - 100 μs Described in Fig.5
Minimum EN Low time TLO 0.3 - 100 μs Described in Fig.5
EN Off Timeout TOFF 1 - - ms Described in Fig.5
Latch time TLAT 1 - - ms Described in Fig.5
Access available time Tacc 1 - 5 ms Described in Fig.5
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2/12
2010.02 - Rev.A
BD1206GUL
●Block Diagram
VBAT
Charge Pump
Mode Control
EN
PWMIN
Enable/
Brightness
Control
GND
●Pin Configuration [Bottom View]
Technical Note
C2N
C1P
C1N
×1, ×1.5, ×2
Charge pump
Over Voltage
Protect
OSC
TSD
4
LED6 DET
Current
DAC
Pin number 14pin
Fig. 1 Block Diagram
C2P
Vout Control
VOUT
LED1
LED2
LED3
LED4
LED5
LED6
D LED1 LED2 PWMIN VBAT
C LED3 LED4 EN C1N
BLED5
A LED6 GND VOUT C2P
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© 2010 ROHM Co., Ltd. All rights reserved.
index
C2N C1P
1 2 3 4
Fig. 2 Pin Configuration
3/12
2010.02 - Rev.A
BD1206GUL
●Package Outline
Technical Note
1206
Lot No.
( UNIT : mm )
Fig. 3 Package Dimension
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© 2010 ROHM Co., Ltd. All rights reserved.
4/12
2010.02 - Rev.A
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