19-2611; Rev 0; 10/02
MAX1875 Evaluation Kit
General Description
The MAX1875 evaluation kit (EV kit) demonstrates a low-
cost application circuit. This dual-PWM synchronous DC-
to-DC converter operates from unregulated AC adapters
and generates precision, low-voltage rails for broad-
band gateways, digital TVs, cable modems, and set-
top boxes.
The MAX1875 EV kit provides dual 1.8V and 3.3V output
voltages from an 8V to 18V input voltage range. It delivers
up to 3.5A output current for the 1.8V output and the 3.3V
output, with greater than 90% efficiency. Both converters
operate 180 degrees out-of-phase to reduce input ripple
current. The EV kit operates at 100kHz switching frequency.
This EV kit is a fully assembled and tested circuit
board. It also allows evaluation of other output voltages
in the 0.75V to 15V range.
The MAX1875 EV kit can also be used to evaluate the
MAX1876 and MAX1858.
PART
MAX1875EVKIT
Features
o
8V to 18V Input Voltage Range
o
1.8V and 3.3V Adjustable Output Voltages
o
3.5A Output Current (1.8V Output)
o
3.5A Output Current (3.3V Output)
o
Lossless Foldback Current Limit
o
100kHz Switching Frequency
o
RST
Output with 140ms Delay
(MAX1876/MAX1858 only)
o
180 Degree Out-of-Phase Operation
o
24-Pin QSOP Package
o
Low-Cost Components
o
Fully Assembled and Tested
Evaluates: MAX1875/MAX1876/MAX1858
Ordering Information
TEMP RANGE
0擄C to +70擄C
IC PACKAGE
24 QSOP
Component List
DESIGNATION QTY
C1, C4
C5, C6, C12
C7
C8
C9, C10, C11,
C13, C14
C17
C18
C19
C20
2
3
1
1
5
1
1
1
1
DESCRIPTION
390碌F, 25V aluminum electrolytic
capacitors Sanyo 25MV390AX
0.1碌F ceramic capacitors (0805)
0.39碌F ceramic capacitor (0805)
0.33碌F ceramic capacitor (0805)
470碌F, 10V aluminum electrolytic
capacitors Sanyo 10MV470AX
2200pF ceramic capacitor (0805)
1500pF ceramic capacitor (0805)
0.22碌F, 16V X5R ceramic capacitor
(0805) Taiyo Yuden EMK212BJ224KG
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
0.01碌F ceramic capacitors (0805)
Not installed (open)
100mA, 30V dual Schottky diode 23-pin
SOT Central Semiconductor CMPSH-3A
15碌H 5A power inductor
DESIGNATION QTY
L2
N1A, N1B,
N2A, N2B
D2鈥揇5
R1
R2, R4
R3
R5
R6
R7
R8
R9
R10
R11
R12, R13
R14
R15
JU1, JU2
U1
None
None
1
2
0
1
2
1
1
1
1
1
1
1
1
2
1
1
2
1
2
1
DESCRIPTION
27碌H 5A power inductor
Dual N-channel MOSFETs 8-pin SO
Fairchild FDS6990A
Not installed (open)
8.06k鈩?/div>
鹵1%
resistor (0805)
10k鈩?/div>
鹵1%
resistors (0805)
23.2k鈩?/div>
鹵1%
resistor (0805)
60.4k鈩?/div>
鹵1%
resistor (0805)
2.7k鈩?/div>
鹵5%
resistor (0805)
2k鈩?/div>
鹵5%
resistor (0805)
49.9k鈩?/div>
鹵1%
resistor (0805)
69.8k鈩?/div>
鹵1%
resistor (0805)
100k鈩?/div>
鹵5%
resistor (0805)
20鈩?/div>
鹵5%
resistor (0805)
3.9鈩?/div>
鹵5%
resistors (0805)
154k鈩?/div>
鹵1%
resistor (0805)
84.5k鈩?/div>
鹵1%
resistor (0805)
3-pin headers
MAX1875EEG 24-pin QSOP
Shunts
MAX1875 PC board
C21
C22, C23
C2, C3, C15
D1
L1
1
2
0
1
1
________________________________________________________________
Maxim Integrated Products
1
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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