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LTC3201| Datasheet

By datasheet - November 4th, 2008

LTC3201| Datasheet

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LTC3201 100mA Ultralow Noise Charge Pump LED Supply with Output Current Adjust

FEATURES
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DESCRIPTIO

Input Noise Filter Minimizes Supply Noise Constant Frequency Operation 3-Bit LED Current Control No Inductors Low Shutdown Current: IIN < 1uA Output Current: 100mA VIN Range: 2.7V to 4.5V 1.8MHz Switching Frequency Soft-Start Limits Inrush Current at Turn-On Short-Circuit and Overtemperature Protected Available in 10-Pin MSOP Package

The LTC 3201 is an ultralow noise, constant frequency, charge pump DC/DC converter specifically designed for powering white LEDs. The part produces a low noise boosted supply capable of supplying 100mA of output current. LED current is regulated for accurate and stable backlighting. A 3-bit DAC provides output current adjust for brightness control. Low external parts count (one small flying capacitor and three small bypass capacitors) and small MSOP-10 package size make the LTC3201 ideally suited for space constrained applications. An input noise filter further reduces input noise, thus enabling direct connection to the battery. High switching frequency enables the use of small external capacitors. The LTC3201 contains overtemperature protection and can survive an indefinite output short to GND. Internal soft-start circuitry also prevents excessive inrush current on start-up. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1uA.

APPLICATIO S
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White LED Backlighting Programmable Boost Current Source

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

Ultralow Noise White LED Driver with Adjustable Current Control
0.22uF

CM + Li ION VIN 1uF 0.22uF LED CURRENT ADJUST 3 FILTER

CP VOUT 1uF

UP TO 6-WHITE LEDs

50mA/DIV

LTC3201 D0-D2 GND

FB 56 56 56
100ns/DIV
3201 TA01a
3201 TA01b

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Input Current Ripple
IOUT = 100mA IIN = 205mA VIN = 3.6V
3201f

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