System LED Drivers for Mobile Phones
ALC* PWM controller
(*ALC : Auto Luminous Control)
BD6092GU
No.09041EAY08
●Description
BD6092GU is the Auto Luminous Control IC, which adjusts PWM duty by surrounding ambient light.
Analog ambient light sensor is connected, and Auto Luminous Control does the automatic adjustment of the PWM output
duty by surrounding ambient light. By connecting to the LED driver’s control port, it can decrease the power consumption of
the back light system. It is possible to input the external PWM signal, and it can be mixed to PWM output.
This IC achieves compact size with the CSP package. (VCSP85H2).
●Features
1) Ambient Light Sensor interface
Main backlight can be controlled by ambient brightness.
Photo Diode, Photo Transistor, Photo IC(Linear/Logarithm) can be connected.
Bias source for ambient light sensor, ADC with an average filter, LOG conversion function, gain and offset
2) adjustment are built in.
PWM duty as ambient level can be customized.
Automatic gain control function can reduce sensor current at high brightness, and sensitivity up at dark brightness.
It can be input the external PWM. Output is mixed internal PWM and external PWM.
3) UVLO Function
2
4) I C BUS Fast-mode protocol compatible(max 400kHz)
2
5) Package : VCSP85H2 (2.8mm , 0.5mm pitch) CSP package
*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.
●Absolute Maximum Ratings (Ta=25 oC)
Parameter
Maximum voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Symbol
VMAX
Pd
Topr
Tstg
Limits
7
1250 note)
-40 ～ +85
-55 ～ +150
Unit
V
mW
℃
℃
note)Power dissipation deleting is 10mW/ oC, when it’s used in over 25 oC.(It’s deleting is on the board that is ROHM’s standard)
●Operating conditions (VBAT≧VIO, Ta=-40～85℃)
Parameter
Symbol
VBAT input voltage
VBAT1,2
VIO pin voltage
VIO
Limits
2.7 ～ 5.5
1.65 ～ 3.3
Unit
V
V
Note1) Using at VBAT≧VIO condition
Note2) Using at same voltage VBAT1 and VBAT2
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