Datasheet

Introduction
1-2
TPS60100 and TPS60110 EVM
1.1 Introduction
The Texas Instruments TPS60100 and TPS60110 charge pumps are regu-
lated voltage doublers. The TPS60100 has an output voltage of 3.3 V from an
input signal between 1.8 V and 3.6 V. The TPS60110 has an output voltage
of 5 V from an input voltage between 2.7 V and 5.4 V. Both devices consist of
two single-ended charge pumps that can operate either in phase (for minimum
external components) or in anti-phase (for minimum output noise). For a de-
scription of the different operation modes and a functional description, please
refer to the datasheets [literature number SLVS213A (TPS60100) and
SLVS215 (TPS60110)].
The minimum number of external parts is three for the single-ended mode
(both charge pumps operate in phase) or four in push-pull mode (the two
charge pumps operate with 180 phase shift). The EVM is built up with six ex-
ternal parts for optimized performance.
The best performance of the charge pumps can be seen with ceramic capaci-
tors. Actually this would be the most expensive solution because of the higher
capacitive parts at the input and output. Therefore, on the TPS60100 or
TPS60110 EVMs tantalum capacitors are used for the higher capacitive parts.
To reduce the spikes during turnover from the transfer phase (charging of the
output capacitor) of one charge pump to that of the other one, a ceramic capac-
itor is used in parallel with the tantalum ones at the input and output. Tantalum
capacitors are not able to filter these spikes because their equivalent series
resistance (ESR) is too high to act as fast as a ceramic one.
The flying capacitors have to be ceramic because they must be charged and
discharged very fast and so their ESR has to be low. This criterion can only be
reached with ceramic capacitors.