The TPS6102x family of devices provide a power supply solution for products powered by
either a one-cell, two-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 battery, and
discharge it down to 0.9 V. The device can also be used for generating 5 V at 500 mA from a 3.3-V
rail 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 in the boost switch is limited to a value of 800 mA, 1500 mA,
or 1800 mA depending on the version of the device.
The TPS6102x devices keep the output voltage regulated even when the input voltage
exceeds the nominal output voltage. The output voltage 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 device is packaged in a 10-pin VSON
PowerPAD package measuring 3 mm x 3 mm
(DRC).
