Datasheet

Maxim Integrated │ 2
www.maximintegrated.com
Evaluates: MAX17505 in
5V Output-Voltage Application
MAX17505 5V Output Evaluation Kit
Quick Start
Recommended Equipment
● MAX17505 5V output EV kit
● 6.5V 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 6.5V 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 terminal
of the 1.7A load to the VOUT PCB pad and the nega-
tive 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 5V.
Detailed Description
The MAX17505 5V 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 5V output from 6.5V to 60V input at
load currents up to 1.7A and features a 500kHz 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.
Note: Indicate that you are using the MAX17505 when contacting these component suppliers.
SUPPLIER PHONE WEBSITE
Coilcraft, Inc. 847-639-6400 www.coilcraft.com
CooperBussmann 713-209-8400 www.cooperindustries.com
Murata Americas 800-241-6574 www.murataamericas.com
Panasonic Corp. 800-344-2112 www.panasonic.com
Component Suppliers