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SM8133B

更新时间： 2024-11-25 03:31:39
品牌 Logo 应用领域
NPC 驱动
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20页 166K
描述
White LED Driver IC

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中文翻译

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SM8133B 数据手册

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SM8133B  
White LED Driver IC  
OVERVIEW  
The SM8133B is a charge pump type white LED driver. It can drive 1 to 6 backlight white LED connected in  
parallel and 1 flash white LED. The output voltage circuit has a 3.0V LDO (Low Dropout Regulator), making  
the device ideal for camera-equipped cellular phones. The charge pump switches between ×1 to ×1.5 boost  
mode in response to LED drive current requirements to extend battery life to the maximum. The boost switch-  
ing occurs in response to the drive current of all the connected LED and thus supports variations in LED for-  
ward-bias voltage drop (VF). Each LED drive current is controlled by a 7-channel LED drive current control  
circuit. The 6 backlight channels can be subdivided into 2 groups, with each group having independent dim-  
ming and lighting control. The backlight grouping, backlight LED drive current and ON/OFF control, flash  
LED drive current and ON/OFF control, and LDO output ON/OFF control are all set by 3-wire serial interface  
data input. Also, the RESETB pin can be connected to the microcontroller supply for a system-wide shutdown  
function.  
FEATURES  
ꢀ Noise reduction due to charge pump boost circuit  
ꢀ Automatic charge pump switching to conserve  
power  
ꢀ Drives 1 to 6 backlight white LED  
(30mA/ch at maximum setting)  
ꢀ Drives a flash white LED  
ꢀ Input voltage range  
• No-load current (I  
= 0mA): 2.7 to 4.6V  
= 80mA): 3.0 to 4.6V  
= 200mA): 3.3 to 4.6V  
OUT  
• Load current (I  
• Load current (I  
ꢀ Quiescent current  
OUT  
OUT  
• LDO only: 0.3mA (typ)  
(150mA at maximum setting)  
ꢀ Backlight and flash white LED brightness  
adjustment  
ꢀ Group settings for 2-group backlight lighting  
control  
ꢀ 3-wire serial input interface for all setting and  
control  
ꢀ 3.0V output LDO circuit built-in  
ꢀ Shutdown function by RESETB pin  
ꢀ Soft start circuit built-in  
• Not -switching (×1.0 mode): 0.5mA (typ)  
• Switching (×1.5 mode): 2.5mA (typ)  
ꢀ Standby current: 0.01µA (typ)  
ꢀ Operating frequency: 750kHz (typ)  
ꢀ Backlight LED current: 30mA/ch (typ)  
ꢀ Flash LED current: 150mA (typ)  
ꢀ All LED total maximum current: 200mA (typ)  
ꢀ Backlight LED current matching (I  
= 30mA)  
LED  
:
3%  
ꢀ Flash LED current accuracy (I  
= 150mA)  
LED  
ꢀ Thermal protection circuit built-in  
:
5%  
ꢀ LDO (Low Dropout Regulator) output voltage  
: 3.0V 2%  
ꢀ Packages:20-pin QFN  
WL-CSP (under development)  
APPLICATIONS  
ORDERING INFORMATION  
ꢀ Cellular phone  
ꢀ Digital still camera  
ꢀ PDA  
Device  
Package  
20-pin QFN  
WL-CSP  
SM8133BB  
SM8133BW  
ꢀ Portable games  
NIPPON PRECISION CIRCUITS INC.—1  
1234567...20

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