Datasheet Linear Technology LT1947 — Datenblatt

LT1947
Adjustable Output TFT-LCD
Triple Switching Regulator
U FEATURES DESCRIPTIO в–  The LTВ®1947 is a highly integrated multiple output DC/DC
converter designed for use in TFT-LCD panels. The device
contains two independent switching regulators. The main
regulator has an adjustable output voltage with an internal
1.1A switch that can generate a boosted voltage as high as
30V. The second regulator’s output is also adjustable up
to 30V and can deliver 10mA for positive bias. A simple
level-shift charge pump off the main switch node generates the negative bias voltage. An external capacitor sets
the delay time from AVDD’s final value to the rising edge at
the VON pin. The 3MHz switching frequency allows the use
of tiny low profile chip inductors and capacitors throughout, providing a low noise, low cost total solution with all
components under 1.2mm in height. The device operates
from an input range of 2.7V to 8V and is available in
10-lead MSOP and thermally enhanced 10-lead MSOP
packages. в– 
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