19-2961; Rev 0; 7/03
MAX1938 Evaluation Kit
General Description
The MAX1938 evaluation kit (EV kit) is a fully tested and
assembled power supply that demonstrates the full
functionality of the MAX1937/MAX1938/MAX1939 family
of synchronous, two-phase, step-down controllers. The
circuit operates from an input supply range of 8V to 14V
and provides VID-controlled CPU core voltage with up
to 60A of output current. The EV kit comes with the
MAX1938 installed, which provides a 5-bit VID code
interface to meet Intel
廬
Voltage-Regulator Module
(VRM) 9.0/9.1 specifications. The MAX1937 and
MAX1939 can also be evaluated using the same board
by replacing the MAX1938. The MAX1937 supports the
AMD Hammer CPU VID codes, and the MAX1939
supports the AMD Athlon鈩?Mobile CPU VID codes.
o
鹵0.75% Output Voltage Accuracy
o
Up to 90% Efficiency鈥擭o Heatsinks
o
Up To 60A Output Current
o
Quick-PWM鈩?Architecture Reduces Output
Capacitors
o
8V to 14V Input Range (8V to 22V with Component
Change)
o
500kHz Output Ripple Frequency
o
MAX1937: AMD Hammer Compatible
o
MAX1938: Intel VRM9.0/9.1 Compatible
o
MAX1939: AMD Athlon Mobile Compatible
o
Controlled (On-the-Fly) VID Voltage Transition
o
Power-Good (PWRGD) Output
o
User-Programmable Voltage Positioning
o
Fully Assembled and Tested
Features
Evaluates: MAX1937/MAX1938/MAX1939
Ordering Information
PART
MAX1938EVKIT
TEMP RANGE
-40擄C to +85擄C
IC PACKAGE
28 QSOP
Note:
To evaluate the MAX1937 or MAX1939, request free sam-
ples along with the MAX1938EVKIT.
Component List
DESIGNATION QTY
C1, C4
2
DESCRIPTION
2.2碌F, 10V X5R capacitors (0805)
Taiyo Yuden LMK212BJ225KG or
equivalent
2.2碌F, 16V X7R capacitor (1206)
Taiyo Yuden EMK316BJ225ML or
equivalent
0.22碌F, 10V X7R capacitors (0603)
Taiyo Yuden LMK107BJ224KA or
equivalent
0.47碌F, 10V X5R capacitor (0603)
Taiyo Yuden LMK107BJ474KA or
equivalent
47pF, 50V C0G capacitor (0603)
Murata GRM39C0G470J050AD or
equivalent
1000pF, 50V X7R capacitors (0603)
Murata GRM39X7R102K or equivalent
1碌F, 10V X7R capacitors (0805)
Taiyo Yuden LMK212BJ105MG or
equivalent
DESIGNATION QTY
C15
C16
C18鈥揅23
C24鈥揅31
C33, C34, C45,
C46
C35鈥揅44,
C54鈥揅57
C47鈥揅53
CON1鈥揅ON6
D1
D2
1
0
6
8
DESCRIPTION
0.01碌F, 50V X7R capacitor (0603)
Taiyo Yuden UMK107B103KZ or
equivalent
Not installed (0603)
330碌F, 25V Al electrolytic capacitors
Sanyo 25MV330WX
560碌F, 4V OSCON (E) capacitors
Sanyo 4SP560M
10碌F, 16V X5R capacitors (1210)
Taiyo Yuden TMK325BJ106MM or
equivalent
Open
Open
Banana jacks, noninsulated
Diode (SOD123)
Central Semiconductor CMHD4448
Dual Schottky diodes SOT23
Central Semiconductor CMPSH-3A
C2
1
C3, C7
2
C5
1
4
C6
C8, C9, C17,
C32
C10鈥揅14
1
0
0
6
1
1
4
5
Quick-PWM is a trademark of Maxim Integrated Products.
Intel is a registered trademark of Intel Corp.
Athlon is a trademark of Advanced Micro Devices, Inc.
___________________________________________________________________________________________
Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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