MAX8550EVKIT Maxim Integrated Products, MAX8550EVKIT Datasheet - Page 2

• 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

• 5VDC power supply (500mA rated)
• 9VDC to 20VDC power supply (5A rated)
• Two digital voltmeters (DVM)
MAX8550 Evaluation Kit
Note: Indicate that you are using the MAX8550 when contact-
ing these component suppliers.
2
Central
Semiconductor
International
Rectifier
Kemet
Sanyo USA
TDK
TOKO America
DESIGNATION QTY
R9, R10, R11
R6, R7, R8
_______________________________________________________________________________________
SUPPLIER
R2, R3
None
None
R12
R13
Q1
Q2
U1
R1
R4
R5
L1
Component List (continued)
Recommended Equipment
1
1
1
1
2
1
1
2
3
1
1
1
6
1
631-435-1110 www.centralsemi.com
310-322-3331 www.irf.com
864-963-6300 www.kemet.com
619-661-6835 www.sanyo.com
847-803-6100 www.component.tdk.com
847-297-0070 www.tokoam.com
Component Suppliers
PHONE
1.0µH, 20A, 1.6mΩ power inductor
(12.6mm x 12.6mm x 5.2mm)
TOKO FDA1254-1R0M
n-channel MOSFET 30V, 9mΩ (SO-8)
International Rectifier IRF7821
n-channel MOSFET 30V, 5mΩ (SO-8)
International Rectifier IRF7832
10Ω ±5% resistor (0603)
100kΩ ±5% resistors (0603)
75kΩ ±1% resistor (0603)
124kΩ ±1% resistor (0603)
Not installed (0603)
0Ω resistors (0603)
Not installed (1812)
20Ω ±5% resistor (0603)
MAX8550ETI (28-pin 5mm x 5mm Thin
QFN)
Shunts
MAX8550 EV kit PC board
DESCRIPTION
WEBSITE
The MAX8550 EV kit is fully assembled and tested. Follow
these steps to verify board operation. Do not turn on the
power supplies until all connections are completed.
1) Ensure a shunt is placed across pins 1-4 of jumper
2) Ensure a shunt is placed across pins 1-2 of jumper
3) Ensure a shunt is placed across pins 1-2 of jumper
4) Ensure a shunt is placed across pins 2-3 of jumper
5) Ensure a shunt is placed across pins 1-2 of jumper
6) Ensure a shunt is placed across pins 2-3 of jumper
7) Connect the 5VDC power supply across the VDD
8) Connect the 12VDC power supply across the VIN
9) Turn on both of the power supplies.
10)Set JU4 (1-2). This turns VDDQ on.
11)Using one of the DVMs, verify that the VDDQ voltage
12)Using the other DVM, verify that the VTT voltage
Table 1. Overvoltage/Undervoltage
Control Input (OVP/UVP)
*Default position.
Note: Refer to the MAX8550/MAX8551 or MAX8550A data
sheet for additional information on OVP/UVP. This mode does
not directly apply to the MAX8551.
JUMPER
JU1 to enable OVP and UVP.
JU2 to set the switching frequency to approximately
600kHz.
JU3 to enable low-noise PWM mode.
JU4 to disable the VDDQ buck output.
JU5 to enable the VTT and VTTR outputs.
JU6 to set the board in normal operation mode.
pad and the PGND pad nearest VIN.
pad and the corresponding PGND pad.
between the VDDQ and PGND pads is 2.5V (±2%).
between the VTT and PGND pads is 1.25V (±2%).
JU1
JU1
JU1
JU1
POSITION
SHUNT
Open
1-4*
1-2
1-3
Detailed Description
Disable OVP and UVP.
Enable UVP. Disable OVP.
Enable OVP and UVP.
Enable OVP. Disable UVP.
Jumper Selection
DESCRIPTION
Quick Start