The TPS65270 is a monolithic, dual synchronous buck regulator with a wide operating input
voltage that can operate in 5-V, 9-V, 12-V, or 15-V bus voltages and battery chemistries. The
converters are designed to simplify its application while giving the designer the option to
optimize their usage according to the target application.
The TPS65270 features a precision 0.8-V reference and can produce output voltages up to
15 V. Each converter features an enable pin that allows dedicated control of each channel that
provides flexibility for power sequencing. Soft-start time in each channel can be adjusted by
choosing different external capacitors. TPS65270 is also able to start up with a prebiased output.
The converter begins switching when output voltage reaches the prebiased voltage.
Constant frequency peak current-mode control simplifies the compensation and provides
fast transient response. Cycle-by-cycle overcurrent protection and hiccup mode operation limits
MOSFET power dissipation in short-circuit or overloading fault conditions. Low-side reverse current
protection also prevents excessive sinking current from damaging the converter.
The switching frequency of the converters can be set from 300 KHz to 1.4 MHz with an
external resistor. Two converters have 180° out-of-phase clock signals to minimize the input filter
requirements and alleviate EMI and input capacitor requirements.
TPS65270 also features a light-load pulse skipping mode (PSM). The PSM mode allows a
power loss reduction on the input power supplied to the system at light loading in order to achieve
light-load high efficiency.
The TPS65270 is available in a 24-pin, thermally enhanced HTSSOP (PWP) package and 24-pin
VQFN (RGE) package.