4.5V to 18V Input Voltage, 3A/2A/2A Output Current Triple Synchronous Buck Converter

The TPS65261, TPS65261-1 is a

monolithic triple synchronous step-down (buck) converter with 3-A/2-A/2-A output

currents. A wide 4.5-V to 18-V input supply voltage range encompasses the most

intermediate bus voltages operating off 5-V, 9-V, 12-V or 15-V power bus. The

converter, with constant frequency peak current mode, is designed to simplify its

application while giving designers options to optimize the system according to

targeted applications. The switching frequency of the converters can be adjusted

from 250 kHz to 2 MHz with an external resistor. The 180° out-of-phase operation

between Buck1 and Buck2, 3 (Buck2 and 3 run in phase) minimizes the input filter

requirements.

The TPS65261, TPS65261-1 features an

automatic power sequence with connecting MODE pin to V7V and configuring EN1/2/3

pins. The device also features an open drain RESET signal to monitor power down.

At light load, the TPS65261

automatically operates in pulse skipping mode (PSM) and the TPS65261-1 operates in

force continuous current mode (FCC). PSM mode provides high efficiency by reducing

switching losses at light loads and FCC mode reduces noise susceptibility and RF

interference.

The device features overvoltage

protection, overcurrent and short-circuit protection and over-temperature

protection. A power-good pin asserts when any output voltages are out of

regulation.