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LC-22LE250
LC-24LE250
FDC642P
General Description and Features
TPS65251
a) General Description
The TPS65251 features three synchronous wide input range high efficiency buck
converters. The converters are designed to simplify its application while giving the designer
the option to optimize their usage according to the target application.
The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power
transistors. The output voltage can be set externally using a resistor divider to any value
between 0.8 V and close to the input supply. Each converter features enable pin that allows a
delayed start-up for sequencing purposes, soft start pin that allows adjustable soft-start time
by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to
adjust current limit by selecting an external resistor and optimize the choice of inductor. The
current mode control allows a simple RC compensation.
The switching frequency of the converters can either be set with an external resistor
connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if
needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. 180° out
of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) minimizes the
input filter requirements.
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