Typical applications

description

In LT^®In 1943, a four-output adjustable switching regulator provided power to large TFT LCD panels. The device, housed in a low-profile 28-pin thermally enhanced TSSOP package, can generate a 3.3V or 5V logic supply with three output supplies required for TFT LCD panels. The operating input voltage range is 4.5V to 22V, and the buck regulator provides a low voltage output V_logicUp to 2A current. A high power boost converter, a lowerpower boost converter and an inverting converter provide 3 independent outputs_voltageAV_DD，Vand V_{Shut down}Requirements for LCD display panels. A high-side PNP provides a delay-on signal V and can handle up to 30mA. Protect the circuit to ensure that the four outputs are disabled if the programmed voltage falls below 10% or more.

The internal 1.2MHz clock synchronization of all switches allows the use of flat inductors and ceramic capacitors throughout. The current-mode architecture provides excellent transient response. For optimal flexibility, all outputs are adjustable. Soft start, included in all four channels. A PGOOD pin drives an optional PMOS bypass device AV_DD'sThe output provides an output disconnect.