MAX8550EVKIT View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8550EVKIT Datasheet PDF : 8 Pages
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MAX8550 Evaluation Kit
Table 2. On-Time Selection Input (TON)
JUMPER
SHUNT
POSITION
DESCRIPTION
JU2
1-2*
600kHz switching frequency
JU2
1-3
450kHz switching frequency
JU2
1-4
200kHz switching frequency
JU2
Open
300kHz switching frequency
*Default position.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on TON.
Table 3. Pulse-Skipping Control Input
(SKIP)
JUMPER
SHUNT
POSITION
DESCRIPTION
JU3
1-2*
Low-noise PWM mode.
Pulse-skipping mode.
JU3
2-3
Use only this position when
evaluating the MAX8551.
*Default position.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on SKIP.
Caution: Do not connect an external controller to the
SKIP pad while a shunt is on jumper JU3.
Table 4. Shutdown Control Input A
(SHDNA)
JUMPER
SHUNT
POSITION
DESCRIPTION
JU4
1-2
The VDDQ buck output is enabled.
JU4
2-3*
*Default position.
The VDDQ buck output is shut
down.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on SHDNA. SHDNA is SHDN
on the MAX8550A.
Caution: Do not connect an external controller to the
SHDNA pad while a shunt is on jumper JU4.
Table 5. Shutdown Control Input B
(SHDNB)
JUMPER
SHUNT
POSITION
DESCRIPTION
JU5
1-2*
The VTT and VTTR outputs are
enabled.
JU5
2-3
The VTT and VTTR outputs are
shut down.
*Default position.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on SHDNB. SHDNB is TP0 on
the MAX8550A.
Caution: Do not connect an external controller to the
SHDNB pad while a shunt is on jumper JU5.
Table 6. Standby Control Input (STBY)
JUMPER
SHUNT
POSITION
DESCRIPTION
JU6
1-2
The VTT output is shut down.
JU6
2-3*
Normal operation.
*Default position.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on STBY. STBY is STBY on the
MAX8550A.
Caution: Do not connect an external controller to the
STBY pad while a shunt is on jumper JU6.
Setting the Buck Regulator Output
Voltage (VDDQ)
The output voltage of the buck regulator is preset to
2.5V on the MAX8550 EV kit for DDR memory applica-
tions. To pin-strap the output voltage to 1.8V follow the
steps below:
1) Remove R9.
2) Solder the 0Ω resistor from step 1 in the R7 location.
Refer to the MAX8550/MAX8551 data sheet to change
the external components for optimum performance.
Low-Side MOSFET Snubber Circuit (Buck)
Fast switching transitions cause ringing because of the
resonating circuit formed by the parasitic inductance
and capacitance at the switching LX node. This high-
frequency ringing occurs at the LX node’s rising and
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