LTC3201 Datasheet | Linear Technology

.. 100m A Ultralow Noise Charge Pump LED Supply with Output Current Adjust Features s s s s s s s s s s s DESCRIPTIO Input Noise Filter Minimizes Supply Noise Constant Frequency Operation 3-Bit LED Current Control No Inductors Low Shutdown Current: IIN < 1µA Output Current: 100m A 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 100m A 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 1µA. U APPLICATIO S s s 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 0.22µF CM + Li ION 1µF 0.22µF LED CURRENT ADJUST 3 VIN FILTER CP VOUT UP TO 6-WHITE LEDs 1µF - - - 50m A/DIV LTC3201 D0-D2 GND FB 56Ω 56Ω 56Ω 3201 TA01a Input Current Ripple IOUT = 100m A IIN = 205m A VIN = 3.6V 100ns/DIV 3201 TA01b 3201f .....