28V, 400mA switching boost converter in SOT-23 package for LCD and white LED applications.

Features of the TPS61040

1.8-V to 6-V Input Voltage Range

Adjustable Output Voltage Range up to 28 V

400-mA (TPS61040) and_250-mA (TPS61041) Internal Switch Current

Up to 1-MHz Switching Frequency

28-μA Typical No-Load Quiescent Current

1-μA Typical Shutdown Current

Internal Soft Start

Available in SOT23-5, TSOT23-5,

and_2-mm × 2-mm × 0.8-mm WSON Packages

Description of TPS61040

The TPS6104x is a high-frequency boost converter dedicated for small to medium LCD biassupply and_white LED backlight supplies. The device is ideal to generate output voltages up to 28 V from a dual-cell NiMH/NiCd or a single-cell Li-Ion battery. The part can also be used to generatestandard 3.3-V or 5-V to 12-V power conversions.

The TPS6104x operates with a switching frequency up to 1 MHz. This frequency allows the use of small external components using ceramic as well as tantalum output capacitors. Together with the thin WSON package, the TPS6104x gives a very small overall solution size. The TPS61040 devicehas an internal 400-mA switch current limit, while the TPS61041 device has a 250-mA switch current limit, offering lower output voltage ripple and_allows the use of a smaller form factor inductor for lower power applications. The low quiescent current (typically 28 μA) together with anoptimized control scheme that allows device operation at very high efficiencies over the entire loadcurrent range.