19-2613; Rev 0; 10/02
MAX1858 Evaluation Kit
General Description
The MAX1858 evaluation kit (EV kit) demonstrates the
MAX1858鈥檚 standard application circuit. This dual PWM
synchronous DC-to-DC converter generates outputs
down to 0.75V for core, I/O, and logic supplies.
The MAX1858 EV kit provides dual 1.8V and 2.5V output
voltages from an 8V to 20V input voltage range. It delivers
up to 10A output current for the 2.5V output and 10A for
the 1.8V output with greater than 90% efficiency. Both
converters operate 180 degrees out-of-phase to reduce
input ripple current. The EV kit operates at 600kHz
switching frequency and has superior line- and load-
transient response.
This EV kit is a fully assembled and tested circuit board.
It allows evaluation of other output voltages in the 0.75V
to 15V range. The MAX1858 EV kit can also be used to
evaluate the MAX1875 and MAX1876.
o
8V to 20V Input Voltage Range
o
1.8V and 2.5V Adjustable Output Voltages
o
10A Output Current (2.5V Output)
o
10A Output Current (1.8V Output)
o
Lossless Foldback Current Limit
o
600kHz Switching Frequency
o
RST
Output with 140ms Delay
o
180 Degrees Out-of-Phase Operation
o
24-Pin QSOP Package
o
Low-Profile Components
o
Fully Assembled and Tested
Features
Evaluates: MAX1858/MAX1875/MAX1876
Ordering Information
PART
MAX1858EVKIT
TEMP RANGE
0擄C to +70擄C
IC PACKAGE
24 QSOP
Component List
DESIGNATION
C1鈥揅4
C5, C6, C22
C7
C8
C9鈥揅16
C17, C18
QTY
4
3
1
1
8
2
DESCRIPTION
10碌F, 25V ceramic capacitors (1812)
Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
0.1碌F ceramic capacitors (0805)
0.01碌F ceramic capacitor (0805)
0.0068碌F ceramic capacitor (0805)
220碌F, 4V, 40m鈩?low-ESR capacitors
Sanyo 4TPC220M
100pF ceramic capacitors (0805)
0.22碌F, 16V X5R ceramic capacitor
(0805)
Taiyo Yuden EMK212BJ224KG or
TDK2012X7R1H224KT
4.7碌F, 10V X5R ceramic capacitor
(1206)
Taiyo Yuden LMK316BJ475ML
0.22碌F, 50V X7R ceramic capacitor
(0805)
Taiyo Yuden UMK212BJ224MG or
TDK C2012X7R1H224M
100mA, 30V dual Schottky diode
Central Semiconductor CMPSH-3A
3A, 30V Schottky diodes
Nihon EC31QS03L
100mA, 30V Schottky diodes
Central Semiconductor CMSSH-3
N1鈥揘4
R1
R2, R4, R5
R3
R6
R7
R8
R9
R10
R11
R12, R13
R14
R15
None
U1
None
DESIGNATION
JU1, JU2
L1, L2
QTY
DESCRIPTION
2
3-pin headers
1.1碌H power inductors
2
Sumida CEP12D38-H-1R1 (18.1A,
6m鈩? 12.5mm x 12.5mm x 4.0mm)
N-channel MOSFETs 8-pin SO
4
International Rectifier IRF7811W or
Fairchild FDS6694
1
8.06k鈩?鹵1% resistor (0805)
3
1
1
1
1
1
1
1
2
1
1
2
1
1
10k鈩?鹵1% resistors (0805)
15k鈩?鹵1% resistor (0805)
8.2k鈩?鹵5% resistor (0805)
5.9k鈩?鹵5% resistor (0805)
97.6k鈩?鹵1% resistor (0805)
140k鈩?鹵1% resistor (0805)
100k鈩?鹵5% resistor (0805)
4.7鈩?鹵5% resistor (0805)
4.7鈩?鹵5% resistors (0603)
118k鈩?鹵1% resistor (0805)
84.5k鈩?鹵1% resistor (0805)
Shunts
MAX1858EEG 24-pin QSOP
MAX1858 PC board
C19
1
C20
1
C21
1
D1
D2, D3
D4, D5
1
2
2
________________________________________________________________
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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