Analog Devices MAX17553C EV Kit A Manual page 4

Evaluates: MAX17553 (MAX17553C) MAX17553C Evaluation
Kit
RESET Output
RESET
The MAX17553C pin has a maximum 6V voltage rating. The EV kit provides a VEXT PCB pad for connecting the
RESET RESET
pullup voltage of the pin. The EV kit also provides a PCB pad to monitor the stepdown converter output.
RESET
goes to high impedance 30µs after the step-down converter outputs rise above 95% of the programmed output
RESET
voltage. goes low when the regulator output voltage drops below 92% (typ) of the programmed output voltage.
RESET
also goes low when EN/UV voltage falls below its threshold value. Refer to the MAX17553 IC data sheet for more
information.
Hot Plug-In and Long Input Cables
The MAX17553CEVKIT# PCB layout provides an optional electrolytic capacitor (C5). This capacitor limits the peak
voltage at the input of the converter when the DC input source is hot-plugged to the EV kit input terminals with long input
cables. The equivalent series resistance (ESR) of the electrolytic capacitor dampens the oscillations caused by interaction
between the inductance of the long input cables and the ceramic capacitors at the buck converter input.
Electromagnetic Interference
Compliance to conducted emission (CE) standards requires an electromagnetic interference (EMI) filter at the input of a
switching power converter. The EMI filter attenuates high-frequency currents drawn by the switching power converter and
limits the noise injected back into the input power source.
The MAX17553CEVKIT# has designated footprints for the placement of conducted EMI filter components as per the bill
of materials (BOM). Use of these filter components results in lower conducted EMI below CISPR32 Class B limits. Cut
open the trace at L2 before installing conducted EMI filter components. The EV kit layout is also designed to limit radiated
emissions from switching nodes of the power converter and complies with CISPR32 Class B RE limits.
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