ROHM BD82103GWL Technical data
LED Drivers for LCD Backlights
Backlight LED Driver
for Small LCD Panels (Charge Pump Type)
BD82103GWL
●Description
BD82103GWL is charge pump type 2 light or 3 light parallel LED driver for the portable instruments.
This IC not only ensures efficient boost by automatically changing the boost rate but also works as a constant current driver
in 16 steps, so that the driving current can be adjusted finely. This IC is best suited to turn on white LEDs that require
high-accuracy LED brightness control.
●Features
1) 2light or 3light parallel LED driver is mounted
2) 16-step LED current adjust function
3) Inter-LED relative current accuracy: 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, x2)
6) High efficiency achieved (Maximum over 93%)
7) It transits for the most suitable power operating by the LED terminal process
of the 3rd light when 2 light driving
8) Various protection functions such as output voltage protection and thermal shutdown circuit are mounted.
9) Package : UCSP50L1 (Thick 0.55mm MAX, Pin pitch 0.4mm) CSP11pin package
●Absolute Maximum Ratings (Ta=25℃)
Parameter Symbol Ratings Unit
Power supply voltage VMAX 7 V
No.11040EBT34
Input voltage ( EN ) Vdin GND-0.3 ~ VBAT+0.3 V
Power dissipation Pd 730 mW
Operating temperature range Topr -30 ~ +85 ℃
Storage temperature range Tstg -55 ~ +150 ℃
Note 1) The measurement value which was mounted on the PCB by ROHM.
When a glass epoxy substrate (70mm × 70mm × 1.6mm) has been mounted, this loss will decrease
5.84mW/℃ if Ta is higher than or equal to 25℃.
●Operating Conditions (Ta = -30 ~ 85
Parameter Symbol
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.
℃)
Ratings
Unit
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© 2011 ROHM Co., Ltd. All rights reserved.
2011.06 - Rev.B
BD82103GWL
●Electrical Characteristics (Unless otherwise noted, Ta = +25℃, VBAT=3.6V)
Parameter Symbol
Current Consumption
Quiescent Current Iq - 0.1 1 μA EN=0V
Current Consumption1 Idd1 - 1.0 2.4 mA x1.0 Mode, Except LED current
Current Consumption2 Idd2 - 2.0 3.5 mA x2.0 Mode, Except LED current
Charge Pump
Oscillator frequency fOSC 0.56 0.85 1.14 MHz
Current Source
LED maximum current ILED-max 18 20 22 mA VBAT≥3.0V
Min. Typ. Max.
Limits
Unit Condition
Technical Note
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
Low threshold voltage VIL - - 0.4 V EN
High threshold voltage VIH 1.4 - - V EN
High level Input current IIH - 0 1 μA EN=Vin
Low level Input current IIL -1 0 - μA EN=0V
Minimum EN High time THI 0.05 - 100 μsec Described in Fig.5
Minimum EN Low time TLO 0.3 - 100 μsec Described in Fig.5
EN Off Timeout TOFF 1 - - msec Described in Fig.5
Latch time TLAT 1 - - msec Described in Fig.5
Access available time Tacc 1 - - msec Described in Fig.5
When LED current 10.0mA
setting and LED terminal voltage 1.0V
When LED current 10.0mA
setting and LED terminal voltage 1.0V
minimum voltage
at LED1~LED3 pins
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© 2011 ROHM Co., Ltd. All rights reserved.
2011.06 - Rev.B
BD82103GWL
●Block Diagram
VBAT
EN
Charge Pump
Mode Control
Enable/
Brightness
Control
4
GND
C1N
C1P
C2P
C2N
×1, ×1.5, ×2
Charge pump
Over Voltage
Protect
OSC
TSD
LED3 DET
Current
DAC
Pin number 11pin
Fig. 1 Block Diagram
Technical Note
VOUT
Vout Cont rol
LED1
LED2
LED3
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© 2011 ROHM Co., Ltd. All rights reserved.
2011.06 - Rev.B
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