Features

• 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 V_ON Delay
• Three Integrated Schottky Diodes
• PGOOD Pin for AV_DD Output Disconnect
• PanelProtect™ Circuitry Disables V_ON Upon Fault
• Thermally Enhanced 38-Lead 5mm × 7mm QFN Package

Typical Application

Description

The LT3513 5-output adjustable switching regulator provides power for large TFT-LCD panels. The 38-pin 5mm × 7mm QFN device can generate a 3.3V or 5V logic supply along with the triple output supply required for the TFT-LCD panel. A lower voltage secondary logic supply may also be generated with the addition of an external NPN driven by the internal linear regulator. A step-down regulator provides a low voltage output, V_LOGIC, with up to 1.2A of current while capable of operating from a wide input range of 4.5V to 30V. A high power step-up converter, a lower power step-up converter and an inverting converter provide the three independent output voltages: AV_DD, V_ON and V_OFF required by the LCD panel. A high-side PNP provides delayed turn-on of the V_ON signal and can handle up to 30mA. Protection circuitry ensures that V_ON is disabled if any of the four outputs are more than 10% below the programmed voltage.