The TPS6040x family of devices generates an unregulated negative output voltage from an
input voltage ranging from 1.6 V to 5.5 V. The devices are typically supplied by a preregulated
supply rail of 5 V or 3.3 V. Due to its wide input voltage range, two or three NiCd, NiMH, or
alkaline battery cells, as well as one Li-Ion cell can also power them.
Only three external 1-µF capacitors are required to build a complete DC-DC charge pump
inverter. Assembled in a 5-pin SOT-23 package, the complete converter can be built on a
50-mm2 board area. Additional board area and component count reduction
is achieved by replacing the Schottky diode that is typically needed for start-up into load by
The TPS6040x can deliver a maximum output current of 60 mA with a typical conversion
efficiency of greater than 90% over a wide output current range. Three device options with 20-kHz,
50-kHz, and 250-kHz fixed-frequency operation are available. TPS60400 comes with a variable
switching frequency to reduce operating current in applications with a wide load range and enables
the design with low-value capacitors.
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