Analog Devices LTC3450 Product Info

• 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 5mV_P-P
• Complete 1mm Component Profile Solution
• Controlled Power-Up Sequence: AV_DD/V_GL/V_GH
• 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

The LTC3450 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.

Applications

• Cellular Handsets with Color Display
• Handheld Instruments
• PDA