Linear introduces regulator for TFT-LCD panels
Linear Technology
LT3513 switching regulator
Linear Technology has announced the LT3513, a five output monolithic switching regulator packaged in a 5mm x 7mm QFN package.
It offers a 2.2A (ISW) buck regulator, a 1.5A (ISW) boost regulator, a 250mA (ISW) boost regulator, a 250mA (ISW) inverter and an LDO controller, all in a single package.
Each channel has an independent soft-start/run pin.
The LT3513's input voltage range of 4.5V to 30V makes it suitable for a wide array of TFT-LCD applications, including automotive, industrial and unregulated wall transformer-based systems.
Its 2MHz switching frequency keeps switching noise out of critical frequency bands, such as AM radio, and ensures tiny externals.
Combined with a 5mm x 7mm QFN package, the LT3513 offers a compact TFT-LCD power solution.
The LT3513's buck regulator can deliver up to 1.2A of output current for logic rails.
A lower voltage secondary logic supply may be generated via the LDO controller and an external NPN Mosfet.
A high-power step-up converter (ISW=1.5A), a lower power step-up converter (ISW=250mA) and an inverting converter (ISW=250mA) provide the three independent output voltages - AVDD, VON and VOFF - required by LCD panels.
An integrated high-side PNP provides a delayed turn on of the VON signal while panel-protect circuitry disables VON if any of the four outputs are more than 10 per cent below their programmed voltage, protecting the TFT-LCD panel.
Other features include integrated schottky diodes, PGOOD pin for AVDD output disconnect and inductor current sense for the buck regulator.
The LT3513EUHF is available from stock in a 38-lead 5mm x 7mm QFN package.
An industrial grade version, the LT3513IUHF, is tested and guaranteed to operate from a -40C to 125C operating junction temperature.
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