Datasheet

MaximIntegrated │ 2
Evaluates: MAX17503 in
5V Output-Voltage Application
MAX17503 5V Output Evaluation Kit
www.maximintegrated.com
Quick Start
Recommended Equipment
● MAX175035VoutputEVkit
● 6.5Vto60V,5ADCinputpowersupply
● Loadcapableofsinking2.5A
● 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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termi-
nalofthe2.5A 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5V.
Detailed Description
The MAX17503 5V output EV kit provides a proven
design to evaluate the MAX17503 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 2.5A 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 MAX17503 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
Taiyo Yuden 800-348-2496 www.t-yuden.com
Component Suppliers