LTC3450 - Triple Output Power Supply for Small TFT-LCD Displays

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.

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

Typical Application

Applications

Cellular Handsets with Color Display
Handheld Instruments
PDA

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3450EUD#PBF	3x3 QFN-16	E	$3.57	$2.50
LTC3450EUD#TRPBF	3x3 QFN-16	E		$2.60

Demo Boards

Part Number	Description	Price
DC553A	LTC3450EUD \| Triple Output TFT-LCD Supply, Vin = 1.5V to 4.6V, Vout = 5.1V/10mA, 15V/500uA, -10V/500uA	Contact Factory