TPS61027

      The TPS6102x devices provide a power supply solution for products powered by either a one-cell, wo-cell, or three-cell alkaline, NiCd or NiMH, or one-cell Li-Ion or Li-polymer battery. Output currents can go as high as 200 mA while using a single-cell alkaline, and discharge it down to 0.9 V. TPS6102x can also be used for generating 5 V at 500 mA from a 3.3-V ail or a Li-Ion battery. The boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using a synchronous rectifier to obtain maximum efficiency. At low load currents the converter enters the Power Save mode to maintain a high efficiency over a wide load current range. The Power Save mode can be disabled, forcing the converter to operate at a fixed switching frequency. The maximum peak current of TPS6102x in the boost switch is limited to a value of 1500 mA.

      The TPS6102x devices keep the output voltage regulated even when the input voltage exceeds the nominal output voltage. The output voltage of TPS6102x can be programmed by an external resistor divider, or is fixed internally on the chip. The converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. A low-EMI mode is implemented to reduce ringing and, in effect, lower radiated electromagnetic energy when the converter enters the discontinuous conduction mode. The TPS6102x is packaged in a 10-pin QFN PowerPAD ™ package measuring 3 mm x 3 mm (DRC).