Datasheet

MAX17501 60V, 500mA, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
www.maximintegrated.com
Maxim Integrated │ 11
Pin Description
Pin Conguration
PIN NAME FUNCTION
1 PGND
PowerGround.ConnectPGNDexternallytothepowergroundplane.ConnectGNDandPGNDpins
together at the ground return path of the V
CC
bypass capacitor.
2 V
IN
Power-Supply Input. The input supply range is from 4.5V to 60V.
3 EN/UVLO
Enable/Undervoltage Lockout Input. Drive EN/UVLO high to enable the output voltage. Connect to the
center of the resistive divider between V
IN
andGNDtosettheinputvoltage(undervoltagethreshold)at
which the device turns on. Pull up to V
IN
for always on.
4 V
CC
5VLDOOutput.BypassV
CC
with1µFceramiccapacitancetoGND.
5 FB/VO
FeedbackInput.Forxedoutputvoltagedevices,directlyconnectFB/VOtotheoutput.Foradjustable
outputvoltagedevices,connectFB/VOtothecenteroftheresistivedividerbetweenV
OUT
andGND.
6 SS Soft-StartInput.ConnectacapacitorfromSStoGNDtosetthesoft-starttime.
7 N.C./COMP
ExternalLoopCompensation.Foradjustableoutputvoltage(MAX17501G/H)connecttoanRCnetwork
fromCOMPtoGND.SeetheExternal Loop Compensation for Adjustable Output Versions section for
moredetails.Foraxed-outputvoltage(MAX17501A/B/E/F),thispinisanoconnect(N.C.)andshould
be left unconnected.
8 RESET
Open-Drain RESET Output. The RESEToutputisdrivenlowifFBdropsbelow92.5%ofitssetvalue.
RESETgoeshigh1024clockcyclesafterFBrisesabove95.5%ofitssetvalue.RESET is valid when
the device is enabled and V
IN
is above 4.5V.
9 GND AnalogGround
10 LX
Switching Node. Connect LX to the switching side of the inductor. LX is high impedance when the device
is in shutdown mode.
— EP
ExposedPad.ConnecttotheGNDpinoftheIC.ConnecttoalargecopperplanebelowtheICtoimprove
heat dissipation capability.
TOP VIEW
*EP = EXPOSED PAD. CONNECT TO GND
TDFN
(3mm x 2mm)
MAX17501
1
2
3
4
5
PGND
V
IN
EN/UVLO
V
CC
FB/VO
LX
GND
RESET
N.C./COMP
SS
+
EP*
10
9
8
7
6