TPS108x Versatile Boost Converter
This is Versatile Boost Converter circuit using TPS108x. The TPS1081 has chosen because it is suitable for application that requires up to 20 V and 100 mA to drive each column of a passive-matrix OLED (PMOLED). the TPS61080 is suitable for application that requires less than 10 V and only tens of milliamps per column for the active-matrix OLED (AMOLED). Here is the circuit:
The TPS61081 and TPS61080 require input voltages as low as 2.5 V and have adjustable outputs of up to 27 V. Current limit rating of the integrated power switches is the different of The TPS61081 and TPS61080 (typically 1.3 A and 0.5 A,respectively).
The TPS6108x boost converters have constant pulse-width-modulation (PWM) frequency and a traditional current-mode-control scheme for low-noise operation. Besides that, it has additional feature such as n adjustable reference voltage, high efficiency and redundant protection circuits—all of which make the TPS6108x ideal for boosting the 3.6-V Li-ion battery voltage used in most portable applications. The converter can also be used to power higher voltage application such as camera flashlights, OLED displays, WLED backlights and thin film-transistor (TFT) LCDs.
The switching frequency of the converter can be configured to 600 kHz for light-load efficiency or 1.2 MHz for smaller, external components. The 3 × 3-mm QFN package can enable an extremely small boost converter for a wide variety of applications because it has internal power switches, integrated feedback compensation and fast PWM switching. For example, a 24- or 12-V or industrial power rail from a 5-or 3.3-V bus. [Source: Texas Instruments Application Note]