MAX8550EVKIT Maxim Integrated Products, MAX8550EVKIT Datasheet - Page 4

• Manufacturer Part Number: MAX8550EVKIT
• Description: EVAL KIT FOR MAX8550
• Manufacturer: Maxim Integrated Products

Specifications of MAX8550EVKIT

• Main Purpose: Special Purpose DC/DC, DDR Memory Supply
• Outputs And Type: 3, Non-Isolated
• Power - Output: 31.8W
• Voltage - Output: 2.5V, 1.25V, 1.25V
• Current - Output: 12A, 1.5A, 10mA
• Voltage - Input: 9 ~ 20V
• Regulator Topology: Buck
• Frequency - Switching: 600kHz
• Board Type: Fully Populated
• Utilized Ic / Part: MAX8550
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

falling transitions and may interfere with circuit perfor-
mance and generate EMI. To dampen this ringing, an
optional series RC snubber circuit is added across the
low-side switch. Below is a simple procedure for select-
ing the value of the series RC for the snubber circuit:
1) Connect a scope probe to the LX node labeled on
2) Estimate the circuit parasitic capacitance (C
3) Estimate the circuit parasitic inductance (L
MAX8550 Evaluation Kit
4
the MAX8550 EV kit schematic and observe the ring-
ing frequency, f
LX by first finding a capacitor value, which, when
connected from LX to PGND1, reduces the ringing
frequency by half. C
as 1/3 the value of the capacitor value found.
the equation:
_______________________________________________________________________________________
L
PAR
R
.
=
(
2
π
PAR
×
f
R
can then be approximated
)
1
2
×
C
PAR
PAR
PAR
) from
) at
4) Calculate R12 for critical dampening from the equation:
Adjust the resistor value up or down to tailor the
desired damping and the peak voltage excursion.
5) Capacitor C15 should be at least 2 to 4 times the
The power loss of the snubber circuit (PWR_SNUB) is
dissipated in the resistor and can be calculated as:
where VIN is the input voltage and f
frequency. Choose the power rating of R12 according
to the specific application’s derating rule for the power
dissipation calculated in the equation above.
Recommended snubber values for this EV kit are 3Ω
(R12) and 2.2nF (C15).
value of C
PWR_SNUB = C15 x VIN
PAR
R12 =
to be effective.
2π × f
R
x L
PAR
SW
2
x f
is the switching
SW