28-V, 400-mA Switch Boost Converter In SOT-23 For LCD And White LED Applications

The TPS61040 41 is a high-frequency boost converter dedicated for small to medium LCD bias supply 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 generate standard 3.3-V/5-V to 12-V power conversions.
The TPS61040 41 operates with a switching frequency up to 1 MHz. This allows the use of small external components using ceramic as well as tantalum output capacitors. Together with the thin SON package, the TPS61040 41 gives a very small overall solution size. The TPS61040 has an internal 400 mA Switch current limit, while the TPS61041 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 A) together with an optimized control scheme, allows device operation at very high efficiencies over the entire load current range.
By Texas Instruments