The TPS6014x step-up, regulated charge pumps generate a 5-V ±4% output voltage from a
1.8-V to 3.6-V input voltage range. The devices are typically powered by two alkaline, NiCd, or
NiMH battery cells and provide an output current of minimum 100 mA from a 2-V input. Only four
external capacitors are needed to build a complete voltage tripler charge pump.
The devices regulate the output by using the pulse-skip topology. The controller is
optimized for lowest output voltage ripple over the complete output current range. The output peak
current and therefore the output voltage ripple are drastically reduced compared to a conventional
pulse-skip topology by regulating the charge pump output resistance. At light loads the maximum
output resistance is limited to assure a low quiescent current.
The TPS60140 includes a low-battery comparator that issues a warning if the battery
voltage drops below a user-adjustable threshold voltage. The TPS60141 features a power-good output
that goes active when the output voltage reaches 90% of its nominal value.
The logic shutdown function disables the converter, reduces the supply current to a
maximum of 1 µA and disconnects the output from the input. Special current-control circuitry
prevents excessive current from being drawn from the battery during start-up. This DC/DC converter
requires no inductors, therefore, EMI is of little concern. The TPS6014x operates over a free-air
temperature range of 40°C to 85°C. It is available in the small, thermally enhanced 20-pin HTSSOP