MAX17536 datasheet(10/19 Pages) MAXIM

10 / 19 page

NAME

FUNCTION

1, 2, 14,15

VIN

Power-Supply Input. 4.5V to 60V input supply range. Connect the VINpinstogether.DecoupletoPGND

with two 2.2µF capacitors; place the capacitors close to the VINandPGNDpins.RefertotheMAX17536

evaluation kit data sheet for a layout example.

PGND

PowerGround.ConnectthePGNDpinexternallytothepower-groundplane.ConnecttheSGNDand

PGNDpinstogetheratthegroundreturnpathoftheVCCbypasscapacitor.RefertotheMAX17536

Evaluation kit data sheet for a layout example.

VCC

5VLDOOutput.BypassVCCwitha2.2µFceramiccapacitancetoSGND.

MODE/

SYNC

MODE/SYNCconfigurestheMAX17536tooperateinPWM,PFM,orDCMmodesofoperation.Leave

MODE/SYNC unconnected for PFM operation (pulse skipping at light loads). Connect MODE/SYNC

toSGNDforconstant-frequencyPWMoperationatallloads.ConnectMODE/SYNCtoVCC for DCM

operation.Thedevicecanbesynchronizedtoanexternalclockusingthispin.SeetheMode Selection

section and the External Frequency Synchronization section for more details.

RESET

Open-Drain RESET Output. The RESET output is driven low if FB drops below 92.2% of its set value.

RESET

goes high 1024 clock cycles after FB rises above 95.6% of its set value.

ProgrammableSwitchingFrequencyInput.ConnectaresistorfromRTtoSGNDtosettheregulator’s

switchingfrequency.LeaveRTopenforthedefault450kHzfrequency.SeetheSetting the Switching

Frequency (RT) section for more details.

SGND

AnalogGround

Atswitchingfrequencieslowerthan450kHz,connectacapacitorfromCFtoFB.LeaveCFopenifthe

switchingfrequencyisequaltoormorethan450kHz.SeetheLoop Compensation section for more details.

FeedbackInput.ConnectFBtothecentertapofanexternalresistor-dividerfromtheoutputtoSGNDto

set the output voltage. See the Adjusting Output Voltage section for more details.

EXTVCC

ExternalPower-SupplyInputfortheBootstrapInternalLDO.Applyingavoltagebetween4.84Vand24V

at the EXTVCC pin draws power for the control circuits and driver from the output by bypassing the VCC

internalLDOandimprovesefficiency.ConnectEXTVCCtotheBuckregulatoroutputcapacitorusingan

R-Cfilter(4.7Ω,0.1μF).BypasstheEXTVCCpintoSGND(seeFigure3).ConnecttheEXTVCCpinto

SGNDwhenthepinisnotbeingused.

MAX17536

TQFN

5mm x 5mm

TOP VIEW

SGND

RESET

BST

Maxim Integrated │ 10

MAX17536

4.5V to 60V, 4A, High-Efficiency, Synchronous

Step-Down DC-DC Converter

with Internal Compensation

www.maximintegrated.com

Pin Description

Pin Configuration

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