The TPS55065 is a switched-mode regulator with integrated switches for voltage-mode
control. With the aid of external components (LC combination), the device regulates the output to 5
V ±3% for a wide input-voltage range.
The TPS55065 device offers a reset function to detect and indicate when the 5-V output
rail is outside of the specified tolerance. This reset delay is programmable using an external
timing capacitor on the REST terminal. Additionally, an alarm (AOUT) feature
is activated when the input supply rail Vdriver is below a prescaled
specified value (set by the AIN terminal).
The TPS55065 device has a frequency-modulation scheme to minimize EMI. The clock
modulator permits a modulation of the switching frequency to reduce interference energy in the
The 5-Vg output is a switched 5-V regulated output with internal current limiting to
prevent assertion of RESET when powering a capacitive load on the supply line. This function is
controlled by the 5Vg_ENABLE terminal. If there is a short to ground on this output (5Vg output),
the output self-protects by operating in a chopping mode. This does, however, increase the output
ripple voltage on VOUT during this fault condition.
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