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参数资料
| 型号： | LC41059GL |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, BGA15 |
| 封装： | WL-CSP-15 |
| 文件页数： | 1/4页 |
| 文件大小： | 59K |
| 代理商： | LC41059GL |
1
TENTATIVE
LC41059
Current Regulated White LED Supply with Brightness Control
///// General Description /////
The LC41059 is a fractional charge pump DC-DC converter with a regulator that provides four regulated
current sources.
It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current
determined by an external sense resistor.
The LC41059 delivers up to 105mA of load current to drive one, two, three, or four White LEDs.
When it
drives four LEDs, maximum 26mA of each LED is available.
When it drives three LEDs, maximum 35mA
of each LED is available.
Current of each LEDs are highly matched regardless of the input voltage range
from 2.7V to 5.5V, or the LED forward voltage range from 3V to 4V.
It operates with 500kHz
fixed-frequency switching without inductors, therefore the EMI noise is very limited, the pictures or tones
generated in the device will not disturbed.
LED brightness can be controlled by both analog voltage input and pulse input.
A voltage between 0V to
1.25V may be applied to the BRGT pin to vary the LED current linearly.
Alternatively, a pulse signal can
be applied to the SD pin to vary the perceived LED brightness.
An active-low input to the SD pin will
shutdown all the circuit, and the LED will turned off.
The LC41059 is available on WL-CSP, QFN or other packages.
///// Features /////
.
Low noise, high efficiency CMOS charge pump
Built-in current mirror with excellent accuracy
Built-in constant current circuit
2.7V to 5.5V input voltage
Drives one, two, three or four white LEDs with maximum total current 105mA
Self-changing of charge pump mode (Pass mode, 3/2 boost mode, 2 boost mode)
+-0.5% current matching of any two LED outputs
Soft start limits inrush current
Charge pump frequency 500kHz
Brightness control with Analog voltage input or Pulse voltage input
Maximum 1uA shutdown current
///// Applications /////
White LED display backlights
White LED keypad backlights
1-Cell Li-Ion battery-operated equipment including PDAs, hand-held PCs, cellular phones
Flat panel displays
///// Package /////
WL-CSP, QFN or other packages are available
.
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