Datasheet

MAX17502 60V, 1A, Ultra-Small, High-Efciency,
Synchronous Step-Down DC-DC Converter
www.maximintegrated.com
Maxim Integrated │ 9
Pin Description
Pin Congurations
PIN
NAME FUNCTION
TDFN TSSOP
1 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 3 V
IN
Power-Supply Input. The input supply range is from 4.5V to 60V.
3 4 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 6 V
CC
5VLDOOutput.BypassV
CC
with1µFceramiccapacitancetoGND.
5 7 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 8 SS Soft-StartInput.ConnectacapacitorfromSStoGNDtosetthesoft-starttime.
7 9 N.C./COMP
ExternalLoopCompensation.Foradjustableoutputvoltage(MAX17502G/H),connecttoanRC
networkfromCOMPtoGND.SeeExternal Loop Compensation for Adjustable Output Versions
sectionformoredetails.Forxedoutputvoltage(MAX17502E/F),thispinisanoconnect(N.C.)
and should be left unconnected.
8 10 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 11 GND AnalogGround
10 13, 14 LX
Switching Node. Connect LX to the switching side of the inductor. LX is high impedance when
the device is in shutdown mode.
— 2, 5, 12 N.C. No Connection. Not internally connected.
— 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.
14
13
12
11
10
9
8
1
2
3
4
5
6
7
LX
LX
N.C.
GNDEN/UVLO
V
IN
N.C.
PGND
TOP VIEW
MAX17502
RESET
N.C./COMP
SSFB/VO
V
CC
N.C.
TSSOP
(5mm x 4.4mm)
+
TOP VIEW
*EP = EXPOSED PAD. CONNECT TO GND
TDFN
(3mm x 2mm)
MAX17502
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
EP*