Datasheet

Maxim Integrated │ 2
www.maximintegrated.com
Evaluates: MAX17505 in
3.3V Output-Voltage Application
MAX17505 3.3V Output Evaluation Kit
Quick Start
Recommended Equipment
● MAX17505 3.3V output EV kit
● 4.5V to 60V, 4A DC input power supply
● Load capable of sinking 2A
● Digital voltmeter (DVM)
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify the board operation. Caution: Do not turn
on power supply until all connections are completed.
● 1) Set the power supply at a voltage between 5V and
60V. Disable the power supply.
● 2) Connect the positive terminal of the power supply
to the VIN PCB pad and the negative terminal to the
nearest PGND PCB pad. Connect the positive termi-
nal of the 1.7A load to the VOUT PCB pad and the
negative terminal to the nearest PGND PCB pad.
● 3) Connect the DVM across the VOUT PCB pad and
the nearest PGND PCB pad.
● 4) Verify that shunts are installed across pins 1-2 on
jumper JU1 and pins 2-3 on jumper JU3 (see Tables 1
and 3 for details).
● 5) Select the shunt position on jumper JU2 according
to the intended mode of operation (see Table 2 for
details).
● 6) Turn on the DC power supply.
● 7) Enable the load.
● 8) Verify that the DVM displays 3.3V.
Detailed Description
The MAX17505 3.3V output EV kit provides a proven
design to evaluate the MAX17505 high-voltage, high-
efficiency, synchronous step-down DC-DC converter. The
EV kit is preset for 3.3V output from 4.5V to 60V input at
load currents up to 1.7A and features a 450kHz switching
frequency for optimum efficiency and component size.
The EV kit includes an EN/UVLO PCB pad and jumper
JU1 to enable the output at a desired input voltage. The
SYNC PCB pad and jumper JU3 allow an external clock
to synchronize the device. Jumper JU2 allows the selec-
tion of a particular mode of operation based on light-load
performance requirements. An additional RESET PCB
pad is available for monitoring whether the converter out-
put is in regulation.
Soft-Start Input (SS)
The device utilizes an adjustable soft-start function to
limit inrush current during startup. The soft-start time is
adjusted by the value of C3, the external capacitor from
SS to GND. The selected output capacitance (C
SEL
) and
the output voltage (V
OUT
) determine the minimum value
of C3, as shown by the following equation:
C3 ≥ 28 x 10
-6
x C
SEL
x V
OUT
The soft-start time (t
SS
) is related to C3 by the following
equation:
t
SS
= C3/(5.55 x 10
-6
)
For example, to program a 1ms soft-start time, C3 should
be 5.6nF.
Component Suppliers
Note: Indicate that you are using the MAX17505 when contacting these component suppliers.
SUPPLIER PHONE WEBSITE
Coilcraft, Inc. 847-639-6400 www.coilcraft.com
Murata Americas 800-241-6574 www.murataamericas.com
Panasonic Corp. 800-344-2112 www.panasonic.com
Sumida Corp. 408-321-9660 www.sumida.com