The TPS65279V is a monolithic dual synchronous buck regulator with wide 4.5-V to 18-V
operating input voltage that can operate in 5-, 9-, 12- 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.
Each buck converter in TPS65279V has external feedback resistors that can be used for
setting the initial start up voltage. The feedback voltage reference for this start-up option is
0.6 V. Once the VID DAC is updated via the I2C, the buck converter
switches feedback resistors from external to internal. The output voltage in each buck can be
programmable from 0.68 V to 1.95 V in 10-mV steps with I2C Controlled
Each buck converter in TPS65279V can also be I2C controlled
for enabling/disabling output voltage, setting the pulse skipping mode and reading the power good
status and die temperature warning.
The switching frequency of the converters can be set from 200 kHz to 1.6 MHz with an
external resistor. Two converters have clock signal with 180° out-of-phase.
Two bucks in TPS65279V can be paralleled to deliver up to 10-A load current by floating
the MODE pin. Two phase operation in current sharing reduces system filtering capacitance and
inductance, alleviates EMI and improves output voltage ripple and noise.
TPS65279V features dedicated enable pin when I2C interface is not
used. Independent soft-start pin provides flexibility in power up programmability. Constant
frequency peak current mode control simplifies the compensation and provides fast transient
response. Cycle-by-cycle over current protection and hiccup mode operation limit MOSFET power
dissipation in short circuit or over loading fault conditions. Low side reverse over current
protection also prevents excessive sinking current from damaging the converter.
TPS65279V also features a light load pulse skipping mode (PSM) that can be controlled by
I2C or MODE pin configuration. The PSM mode allows a power loss
reduction on the input power supplied to the system to achieve high efficiency at light
The TPS65279V is available in a 32-pin thermally enhanced HTSSOP (DAP) package and 36-pin
QFN 6-mm × 6-mm (RHH) package.
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