LTC3450

U U LTC3450 Triple Output Power Supply for Small TFT-LCD Displays FEATURES ■ Generates Three Voltages: 5.1V at 10mA – 5V, –10V, or –15V at 500µA 10V or 15V at 500µA ■ Better than 90% Efficiency ■ Low Output Ripple: Less than 5mVP-P ■ Complete 1mm Component Profile Solution ■ Controlled Power-Up Sequence: AVDD/VGL/VGH ■ All Outputs Disconnected and Actively Discharged in Shutdown ■ Low Noise Fixed Frequency Operation ■ Frequency Reduction Input for High Efficiency in Blank Mode ■ Ultralow Quiescent Current: 75µA (Typ) in Scan Mode ■ Available in a 3mm × 3mm 16-Pin QFN Package U APPLICATIO S ■ Cellular Handsets with Color Display ■ Handheld Instruments ■ PDA DESCRIPTIO The LTC®3450 is a complete power converter solution for small thin film transistor (TFT) liquid crystal display (LCD) panels. The device operates from a single Lithium-Ion cell, 2- to 3-cell alkaline input or any voltage source between 1.5V and 4.6V. The synchronous boost converter generates a low noise, high efficiency 5.1V, 10mA supply. Internal charge pumps are used to generate 10V, 15V, and –5V, –10V or –15V. Output sequencing is controlled internally to insure proper initialization of the LCD panel. A master shutdown input reduces quiescent current to <2µA and quickly discharges each output for rapid turn off of the LCD panel. The LTC3450 is offered in a low profile (0.75mm), 3mm × 3mm 16-pin QFN package, minimizing the solution profile and footprint. , LTC and LT are registered trademarks of Linear Techn...