The TPIC74100 is a switch-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 TPIC74100 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 pin. Additionally, an alarm (AOUT) feature is
activated when the input supply rail Vdriver is below a prescaled specified
value (set by the AIN pin).
The TPIC74100 has a frequency-modulation scheme to minimize EMI. The clock modulator
permits a modulation of the switching frequency to reduce interference energy in the frequency
The 5Vg output is a switched 5-V regulated output with internal current limiting to
prevent RESET from being asserted when powering a capacitive load on the supply line. This function
is controlled by the 5Vg_ENABLE pin. 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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