MAX8632EVKIT [MAXIM]
Evaluation Kit; 评估套件
| 型号： | MAX8632EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit |
| 文件： | 总9页 (文件大小：893K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3840; Rev 0; 10/05
MAX8632 Evaluation Kit
General Description
Features
♦ VDDQ Preset to 1.8V/10A
The MAX8632 evaluation kit (EV kit) is designed to evalu-
ate the MAX8632 DDR power-supply solution for note-
books, desktops, and graphics cards. The EV kit board
produces VDDQ at the output of the synchronous PWM
buck, VTT at the output of the sourcing/sinking LDO linear
regulator, and VTTR at the output of the reference buffer.
♦ VTT 0.9V Source/Sink 1.5A Continuous/3A Peak
♦ VTTR 0.9V Source/Sink 10mA
♦ V Range: 7V to 20.5V
IN
♦ Optimized Switching Frequency: 300kHz
♦ Overvoltage/Undervoltage Protection
♦ Independent Shutdown and Standby Controls
♦ Power OK
The VDDQ output is preset to 1.8V and sources up to
10A. The VTT output is always VDDQ/2 and can
source/sink up to 3A of peak current and 1.5A of continu-
ous current. The VTTR output is also always VDDQ/2
and can source/sink up to 10mA.
The MAX8632 EV kit was conveniently designed with
jumpers to select the OVP/UVP, TON, SKIP, STBY, and
SHDN modes. The board’s default settings enable OVP
(overvoltage protection), 300kHz switching frequency,
low-noise PWM mode, VDDQ, VTT, and VTTR.
Ordering Information
PART
TEMP RANGE
IC PACKAGE
The VIN input accepts voltages from 7V to 20.5V and
VDD requires a 5V bias supply.
MAX8632EVKIT
0°C to +70°C
28 Thin QFN 5mm x 5mm
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.1µF 10ꢀ, 16V X7R (0603) ceramic
capacitor
Taiyo Yuden EMK107BJ104MA
4700pF 10ꢀ, 50V X7R (0603)
C1
1
ceramic capacitor
Kemet C0603C472K5RAC or
equivalent
C9
1
10µF 10ꢀ, 6.3V X5R (0805) ceramic
capacitors
Kemet C0805C106K9PAC
Taiyo Yuden JMK212BJ106MG
150µF, 4V, 18mΩ POS capacitors
Sanyo 4TPE150MI
C2, C4A,
C4B
C11, C12
D1
2
1
3
Schottky diode, 30V, 100mA (SOD-323)
Central CMDSH-3
1µF 10ꢀ, 10V X5R (0603) ceramic
capacitors
TDK C1608X5R1A105K
C3, C6
C5
2
1
2
3-pin headers, 0.1in center
36-pin header, 0.1in center
Sullins PTC36SAAN or equivalent
Digi-key S1012-36-ND
JU1–JU4, JU6
5
4.7µF 20ꢀ, 6.3V (0805) X5R ceramic
capacitor
TDK C2012X5R0J475M
1.4µH, 15.5A, 2.8mΩ power inductor
Sumida CEP125-1R4MC-U
L1
Q1
Q2
1
1
1
0.22µF 20ꢀ, 16V X7R (0603)
ceramic capacitors
TDK C1608X7R1C224M
30V, 12mΩ (SO-8) n-channel MOSFET
International Rectifier IRF7821
C7, C10
30V, 4mΩ (SO-8) n-channel MOSFET
International Rectifier IRF7832
10µF 20ꢀ, 25V X5R (1210) ceramic
capacitors
C8A, C8B, C8C
3
Taiyo Yuden TMK325BJ106MM
TDK C3225X5R1E106M
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAX8632 Evaluation Kit
3) Ensure a shunt is placed across pins 1-2 of jumper
JU3 to enable low-noise PWM mode.
Component List (continued)
DESIGNATION QTY
DESCRIPTION
10Ω 5ꢀ (0603) resistor
100kΩ 5ꢀ (0603) resistors
36.5kΩ 1ꢀ (0603) resistor
20Ω 5ꢀ (0603) resistor
0Ω 5ꢀ (0603) resistor
4) Ensure a shunt is placed across pins 2-3 of jumper
JU4 to disable the VDDQ buck output.
R1
R2, R3, R4
R5
1
3
1
1
1
5) Ensure a shunt is placed across pins 2-3 of jumper
JU6 to set the board in normal operation mode.
R13
6) Connect the 5VDC power supply across the VDD
pad and the GND pad nearest VIN.
R18
7) Connect the 12VDC power supply across the VIN
pad and the corresponding GND pad.
Integrated DDR power supply
(28-pin, 5mm x 5mm, Thin QFN)
MAX8632ETI+
U1
—
1
5
8) Turn on both of the power supplies.
9) Set JU4 (1-2). This turns VDDQ on.
Shunts
10)Using one of the DVMs, verify that the VDDQ voltage
between the VDDQ and PGND pads is 1.8V ( 2ꢀ).
Sullins STC02SYAN
Digi-key S9000-ND or equivalent
11)Using the other DVM, verify that the VTT voltage
between the VTT and PGND pads is 0.9V ( 2ꢀ).
Component Suppliers
Detailed Description
SUPPLIER
PHONE
WEBSITE
Central
Semiconductor
Jumper Selection
631-435-1110 www.centralsemi.com
310-322-3331 www.irf.com
Table 1. Overvoltage/Undervoltage
Control Input (OVP/UVP)
International
Rectifier
SHUNT
POSITION
Kemet
864-963-6300 www.kemet.com
619-661-6835 www.sanyo.com
847-545-6700 www.sumida.com
800-348-2496 www.t-yuden.com
847-803-6100 www.component.tdk.com
JUMPER
DESCRIPTION
Sanyo USA
Sumida
JU2
JU2
JU2
JU2
1-2
1-3
Disable OVP and UVP.
Enable UVP. Disable OVP.
Enable OVP and UVP.
Taiyo Yuden
TDK
1-4*
Open
Enable OVP. Disable UVP.
Note: Indicate that you are using the MAX8632 when contact-
ing these component suppliers.
*Default position.
Note: Refer to the MAX8632 data sheet for additional informa-
tion on OVP/UVP.
Recommended Equipment
• 5VDC power supply (500mA rated)
Setting the Buck Regulator Output
Voltage (VDDQ)
The output voltage of the buck regulator is preset to
1.8V on the MAX8632 EV kit for DDR memory applica-
tions. To pin-strap the output voltage to 2.5V, follow the
steps below:
• 7VDC to 20.5VDC power supply (5A rated)
• Two digital voltmeters (DVM)
Quick Start
The MAX8632 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) Remove R18.
2) Solder the 0Ω resistor from step 1 in the R9 location.
1) Ensure a shunt is placed across pins 1-4 of jumper
JU2 to enable OVP and UVP.
Refer to the MAX8632 data sheet to change the external
components for optimum performance.
2) Ensure jumper JU1 is open to set the switching fre-
quency to approximately 300kHz.
2
_______________________________________________________________________________________
MAX8632 Evaluation Kit
Table 2. On-Time Selection Input (TON)
Table 4. Shutdown Control Input (SHDN)
SHUNT
POSITION
SHUNT
POSITION
JUMPER
DESCRIPTION
JUMPER
JU4
DESCRIPTION
JU1
JU1
JU1
JU1
1-2
1-3
600kHz switching frequency
450kHz switching frequency
200kHz switching frequency
300kHz switching frequency
1-2
The VDDQ buck output is enabled.
The VDDQ buck output is shut
down.
JU4
2-3*
1-4
*Default position.
Open*
Note: Refer to the MAX8632 data sheet for additional informa-
tion on SHDN.
*Default position.
Note: Refer to the MAX8632 data sheet for additional informa-
tion on TON.
Table 3. Pulse-Skipping Control Input
Table 5. Standby Control Input (STBY)
(SKIP)
SHUNT
POSITION
JUMPER
DESCRIPTION
SHUNT
POSITION
JUMPER
DESCRIPTION
JU6
JU6
2-3
The VTT output is shut down.
Normal operation.
1-2*
JU3
JU3
1-2*
2-3
Low-noise PWM mode.
Pulse-skipping mode.
*Default position.
Note: Refer to the MAX8632 data sheet for additional informa-
tion on STBY.
*Default position.
Note: Refer to the MAX8632 data sheet for additional informa-
tion on SKIP.
_______________________________________________________________________________________
3
MAX8632 Evaluation Kit
AMX8623
Figure 1. MAX8632 EV Kit Schematic
_______________________________________________________________________________________
4
MAX8632 Evaluation KitMAX8632 Evaluation Kit
Figure 2. MAX8632 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
5
MAX8632 Evaluation Kit
Figure 3. MAX8632 EV Kit PC Board Layout—Component Side
6
_______________________________________________________________________________________
MAX8632 Evaluation Kit
Figure 4. MAX8632 EV Kit PC Board Layout—Inner Layer 2
_______________________________________________________________________________________
7
MAX8632 Evaluation Kit
Figure 5. MAX8632 EV Kit PC Board Layout—Inner Layer 3
8
_______________________________________________________________________________________
MAX8632 Evaluation KitMAX8632 Evaluation Kit
Figure 6. MAX8632 EV Kit PC Board Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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