MAX8550EVKIT Maxim Integrated Products, MAX8550EVKIT Datasheet - Page 3

• 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

Table 2. On-Time Selection Input (TON)
*Default position.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on TON.
Table 3. Pulse-Skipping Control Input
(SKIP)
*Default position.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on
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)
*Default position.
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.
JUMPER
JUMPER
JUMPER
JU2
JU2
JU2
JU2
JU3
JU3
JU4
JU4
POSITION
POSITION
POSITION
SHUNT
SHUNT
SHUNT
Open
1-2*
1-2*
2-3*
1-3
1-4
2-3
1-2
_______________________________________________________________________________________
Low-noise PWM mode.
Pulse-skipping mode.
Use only this position when
evaluating the MAX8551.
The VDDQ buck output is enabled.
The VDDQ buck output is shut
down.
600kHz switching frequency
450kHz switching frequency
200kHz switching frequency
300kHz switching frequency
SKIP .
DESCRIPTION
DESCRIPTION
DESCRIPTION
MAX8550 Evaluation Kit
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.
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
Table 5. Shutdown Control Input B
(SHDNB)
*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)
*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.
JUMPER
Low-Side MOSFET Snubber Circuit (Buck)
JUMPER
JU5
JU5
JU6
JU6
Setting the Buck Regulator Output
POSITION
POSITION
SHUNT
SHUNT
1-2*
2-3*
2-3
1-2
The VTT and VTTR outputs are
enabled.
The VTT and VTTR outputs are
shut down.
The VTT output is shut down.
Normal operation.
DESCRIPTION
DESCRIPTION
Voltage (VDDQ)
3