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MAX17504 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX17504 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 18 page Maxim Integrated │ 10 MAX17504 4.5V–60V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation www.maximintegrated.com Pin Description Pin Configuration PIN NAME FUNCTION 1, 2, 3 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.RefertotheMAX17504 Evaluation Kit datasheet for a layout example. 4 EN/UVLO Enable/Undervoltage Lockout. Drive EN/UVLO high to enable the output voltage. Connect to the center of the resistor-divider between VINandSGNDtosettheinputvoltageatwhichtheMAX17504turnson. Pull up to VIN for always on operation. 5 RESET Open-Drain RESET Output. The RESET output is driven low if FB drops below 92% of its set value. RESET goes high 1024 clock cycles after FB rises above 95% of its set value. 6 SYNC Thedevicecanbesynchronizedtoanexternalclockusingthispin.SeetheExternal Frequency Synchronization section for more details. 7 SS Soft-StartInput.ConnectacapacitorfromSStoSGNDtosetthesoft-starttime. 8 CF Atswitchingfrequencieslowerthan500kHz,connectacapacitorfromCFtoFB.LeaveCFopenifthe switchingfrequencyisequaltoormorethan500kHz.SeetheLoop Compensation section for more details. 9 FB FeedbackInput.ConnectFBtothecentertapofanexternalresistor-dividerfromtheoutputtoSGNDto set the output voltage. See the Adjusting Output Voltage section for more details. 10 RT ConnectaresistorfromRTtoSGNDtosettheregulator’sswitchingfrequency.LeaveRTopenforthe default500kHzfrequency.SeetheSetting the Switching Frequency (RT) section for more details. 11 MODE MODEconfigurestheMAX17504tooperateinPWM,PFMorDCMmodesofoperation.LeaveMODE unconnectedforPFMoperation(pulseskippingatlightloads).ConnectMODEtoSGNDforconstant- frequency PWM operation at all loads. Connect MODE to VCC for DCM operation. See the Mode Selection (MODE) section for more details. 19 20 * EXPOSED PAD (CONNECT TO SIGNAL GROUND). 18 17 7 6 8 9 12 LX 45 15 14 12 11 LX BST FB CF SS SYNC + 3 13 LX 16 10 RT PGND TQFN 5mm × 5mm MAX17504 TOP VIEW |
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