MILPITAS, CA - October 7, 2008 - Linear Technology Corporation announces the LT3513, a five output monolithic switching regulator packaged in a 5mm x 7mm QFN package. It offers a 2.2A (I_SW) buck regulator, a 1.5A (I_SW) boost regulator, a 250mA (I_SW) boost regulator, a 250mA (I_SW) 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 ideal 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 very 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 (I_SW=1.5A), a lower power step-up converter (I_SW=250mA) and an inverting converter (I_SW=250mA) provide the three independent output voltages: AV_DD, V_ON and V_OFF required by LCD panels. An integrated high side PNP provides a delayed turn on of the V_ON signal while Panel Protect circuitry disables V_ON if any of the four outputs are more than 10% below their programmed voltage, protecting the TFT-LCD panel. Other features include integrated schottky diodes, PGOOD pin for AV_DD 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. Pricing starts at $4.25 each in 1,000-piece quantities. An industrial grade version, the LT3513IUHF, is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $5.00 each in 1,000-piece quantities. All versions are available from stock.

Summary of Features: LT3513 4.5V to 30V Input Voltage Range Four Integrated Switches: 2.2A Buck, 1.5A Boost, 0.25A Boost, 0.25A Inverter (Guaranteed Minimum Current Limit) External NPN LDO Driver Fixed Frequency, Low Noise Outputs Inductor Current Sense for Buck Soft-Start for All Outputs Externally Programmable VON Delay Three Integrated Schottky Diodes PGOOD Pin for AVDD Output Disconnect PanelProtect™ Circuitry Disables VON upon Fault Thermally Enhanced 38-Lead 5mm × 7mm QFN Package

2MHz Five Output Regulator for TFT-LCD Panels Click Photo for High-Res Image