Datasheet

MaximIntegrated │ 2
Evaluates: MAX17504 in
3.3V Output-Voltage Application
MAX17504 3.3V Output Evaluation Kit
www.maximintegrated.com
Quick Start
Recommended Equipment
● MAX175043.3VoutputEVkit
● 5Vto60V,7ADCinputpowersupply
● Loadcapableofsinking3.5A
● 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3.5A 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 MAX17504 3.3V output EV kit provides a proven
design to evaluate the MAX17504 high-voltage, high-
efficiency, synchronous step-down DC-DC converter. The
EVkitispresetfor3.3Voutputfrom5Vto60Vinputat
load currents up to 3.5A 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 2.2mS soft-start time, C3
shouldbe12nF.
Note: Indicate that you are using the MAX17504 when contacting these component suppliers.
SUPPLIER PHONE WEBSITE
Coilcraft,Inc. 847-639-6400 www.coilcraft.com
CooperBussmann 636-394-2877 www.cooperindustries.com
Murata Americas 800-241-6574 www.murataamericas.com
PanasonicCorp. 800-344-2112 www.panasonic.com
Component Suppliers