19-1817; Rev 0; 10/00
MAX1744 Evaluation Kit
General Description
The MAX1744 evaluation kit (EV kit) provides a selec-
table 3.3V or 5V output voltage from input as high as
36V. The MAX1744 operates up to 100% duty cycle,
extending the usable input voltage range. The 100%
duty cycle and a low 100mV current-sense level permit
very low dropout voltages. The circuit is configured to
deliver up to 2A of output current with greater than 90%
conversion efficiency. The output current can be
increased by changing the external components.
This EV kit is a fully assembled and tested circuit
board. It can also be used to evaluate the MAX1745,
which has an adjustable output voltage, by selecting
feedback resistors R2 and R3.
o
High Input Voltage (up to 36V)
o
Selectable 3.3V or 5V Output Voltage (MAX1744)
o
1.25V to 18V Adjustable Output Voltage
(MAX1745)
o
Low Dropout Voltage
o
100% Maximum Duty Cycle
o
2A Output Current
o
Up to 330kHz Switching Frequency
o
4碌A(chǔ) IC Shutdown Current
o
10-Pin 碌MAX Package
o
Fully Assembled and Tested
Features
Evaluates: MAX1744/MAX1745
Ordering Information
PART
MAX1744EVKIT
TEMP. RANGE
0擄C to +70擄C
IC PACKAGE
10 碌MAX
Note:
To evaluate the MAX1745, request a MAX1745EUB free
sample with the MAX1744EVKIT.
Component List
DESIGNATION
C1, C2
QTY
2
DESCRIPTION
120碌F, 63V electrolytic
capacitors
Sanyo 63MV120GX
220碌F, 10V tantalum capacitor
AVX TPSE227M010R0100 or
Sprague 593D227X0010E 2W
4.7碌F, 16V tantalum capacitors
Sprague 595D475X0016A 2B
0.1碌F ceramic capacitor (1206)
0.47碌F ceramic capacitor (1206)
2A, 60V Schottky diode
Nihon EC21QS06 or
Central Semiconductor CMSH2-60
22碌H inductor
Sumida CDRH104R-220MC
(shielded), Sumida CDRH124-
220MC (shielded),
Coilcraft DO3316P-223
(unshielded), or Coiltronics
UP2B-220 (unshielded)
DESIGNATION
P1
R1
R2, R3
U1
JU1, JU2
None
None
None
None
QTY
1
1
0
1
2
2
1
1
1
DESCRIPTION
60V P-channel MOSFET
Fairchild NDS9407
0.033鈩?/div>
鹵1%
resistor (2010)
Dale WSL-2010-R033F or
IRC LR2010-R033F
Not installed
MAX1744EUB (10-pin 碌MAX)
3-pin headers
Shunts
MAX1744/MAX1745 PC board
MAX1744/MAX1745 data sheet
MAX1744 EV kit data sheet
C3
C4, C5
C6
C7
D1
1
2
1
1
1
L1
1
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.
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