A12 60V 1A ltraSmall HighEfficienc Snchronos StepDown …

1 MAX1750260V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter General DescriptionThe MAX17502 high-efficiency, high-voltage, synchro nous step-down DC-DC converter with integrated MOSFETs operates over a to 60V input voltage range. This device is offered in a fixed , 5V or adjustable output voltage ( to 92%VIN) while delivering up to 1A of current. The output voltage is accurate to within over -40 C to +125 C. The MAX17502 is available in compact TDFN and TSSOP packages. Simulation models are device features peak-current-mode control with pulse-width modulation (PWM) and operates with fixed switching frequency at any load. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level.

2 An open-drain RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output Industrial Process Control HVAC and Building Control Base Station, VOIP, Telecom Home Theatre Battery-Powered Equipment General-Purpose Point-of-LoadBenefits and Features Eliminates External Components and Reduces Total Cost No Schottky-Synchronous Operation for High Efficiency and Reduced Cost Internal Compensation and Feedback Divider for and 5V Fixed Outputs All-Ceramic Capacitors, Ultra-Compact Layout Reduces Number of DC-DC Regulators to Stock Wide to 60V Input Voltage Range to 92%VIN Adjustable Output Voltage Delivers up to 1A 600kHz and 300kHz Switching Frequency Options Available in a 10-Pin, 3mm x 2mm TDFN and 14-Pin, 5mm x TSSOP Packages Reduces Power Dissipation Peak Efficiency > 90% Shutdown Current = A (typ) Operates Reliably in Adverse Industrial Environments Hiccup-Mode Current Limit, Sink Current Limit, and Autoretry Startup Built-In Output-Voltage Monitoring (Open-Drain RESET Pin) Resistor-Programmable EN/UVLO Threshold Adjustable Soft-Start and Prebiased Power-Up High Industrial -40 C to +125 C Ambient Operating Temperature Range/-40 C to +150 C Junction Temperature Range19-6245 Rev 5; 6/16 Ordering Information/Selector Guide appears at end of data , 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Integrated 2 Electrical Characteristics(VIN = 24V, VGND = VPGND = 0V, CVIN = F, CVCC = 1 F, VEN = , CSS = 3300pF, VFB = x VOUT, LX = unconnected, RESET = unconnected.)

3 TA = -40 C to +125 C, unless otherwise noted. Typical values are at TA = +25 C. All voltages are referenced to GND, unless otherwise noted.) (Note 2)Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to to to +70V EN/UVLO to to (VIN + ) LX to to (VIN + )FB, RESET, COMP, SS to GND .. to +6V VCC to to +6V GND to to + LX Total RMS Output Short-Circuit +150 C Storage Temperature -65 C to +160 C Lead Temperature (soldering, 10s)..+300 C Soldering Temperature (reflow)..+260 CStresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied.

4 Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Junction temperature greater than +125 C degrades operating Thermal Characteristics(Note 1)10 TDFNC ontinuous Power Dissipation (TA = +70 C) (derate C above +70 C) (multilayer board) . Thermal Resistance ( JA) .. C/WJunction-to-Case Thermal Resistance ( JC) .. C/W14 TSSOPC ontinuous Power Dissipation (TA = +70 C) (derate C above +70 C) .. Thermal Resistance ( JA) ..39 C/WJunction-to-Case Thermal Resistance ( JC) ..3 C/WAbsolute Maximum RatingsPARAMETERSYMBOLCONDITIONSMINTYPMA XUNITSINPUT SUPPLY (VIN)Input Voltage Supply CurrentIIN-SHVEN = 0V, shutdown AIIN-SWNormal switching mode, no loadMAX17502E/ (EN/UVLO)EN ThresholdVENRVEN falling, true Input Leakage CurrentIENVEN = VIN = 60V, TA = +25 C8200nALDOVCC Output Voltage RangeVCC6V < VIN < 12V, 0mA < IVCC < 10mA, 12V < VIN < 60V, 0mA < IVCC < Current LimitIVCC-MAXVCC = , VIN = 12V154080mAVCC DropoutVCC-DOVIN = , IVCC = UVLOVCC-UVRVCC , 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Integrated 3 Electrical Characteristics (continued)(VIN = 24V, VGND = VPGND = 0V, CVIN = F, CVCC = 1 F, VEN = , CSS = 3300pF, VFB = x VOUT, LX = unconnected, RESET = unconnected.)

5 TA = -40 C to +125 C, unless otherwise noted. Typical values are at TA = +25 C. All voltages are referenced to GND, unless otherwise noted.) (Note 2)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNIT SPOWER MOSFETsHigh-Side pMOS On-ResistanceRDS-ONHILX = (sourcing)TA = +25 TA = TJ = +125 C (Note 3) nMOS On-ResistanceRDS-ONLILX = (sinking)TA = +25 TA = TJ = +125 C (Note 3) Leakage CurrentILX_LKGVEN = 0V, TA = +25 C, VLX = (VPGND + 1V) to (VIN - 1V)1 ASOFT-START (SS)Charging CurrentISSVSS = AFEEDBACK (FB/VO)FB Regulation VoltageVFB_REGMAX17501 Input Bias CurrentIFBTA = +25 NCMAX17502E, VFB = AMAX17502F, VFB = , VFB = VOLTAGE (VOUT)Output Voltage x x VINTRANSCONDUCTANCE AMPLIFIER (COMP)TransconductanceGMICOMP = A, MAX17502G/H510590650 SCOMP Source CurrentICOMP_SRCMAX17502G/H193255 ACOMP Sink CurrentICOMP_SINKMAX17502G/H193255 ACurrent-Sense TransresistanceRCSMAX17502 , 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Integrated 4 Electrical Characteristics (continued)

6 (VIN = 24V, VGND = VPGND = 0V, CVIN = F, CVCC = 1 F, VEN = , CSS = 3300pF, VFB = x VOUT, LX = unconnected, RESET = unconnected. TA = -40 C to +125 C, unless otherwise noted. Typical values are at TA = +25 C. All voltages are referenced to GND, unless otherwise noted.) (Note 2)Note 2: All limits are 100% tested at +25 C. Limits over the operating temperature range and relevant supply voltage range are guaranteed by design and characterization. Note 3: Guaranteed by design, not production tested. PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSC URRENT LIMITPeak Current-Limit Current-Limit Current-Limit ThresholdISINK-LIMITMAX17502E/F/ FrequencyfSWVFB > VOUT-HICFMAX17502E/F/G560600640kHzMAX175 02H280300320 VFB < VOUT-HICF280300320 Events to Hiccup after Crossing Runaway Current Limit1 EventVOUT Undervoltage Trip Level to Cause HiccupVOUT-HICFVSS > (soft-start is done) Timeout32,768 CyclesMinimum On-TimetON_MIN75120nsMaximum Duty CycleDMAXVFB = x VFB-REGMAX17502E/F/G929496% Dead Time5nsRESETRESET Output Level LowIRESET = Output Leakage Current HighVFB = x VFB-REG, TA = +25 AVOUT Threshold for RESET FallingVOUT-OKFVFB Threshold for RESET RisingVOUT-OKRVFB Delay After FB Reaches 95% RegulationVFB rising1024 CyclesTHERMAL SHUTDOWNT hermal-Shutdown ThresholdTemperature rising165 CThermal-Shutdown Hysteresis10 CMaxim Integrated , 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC ConverterTypical Operating Characteristics(VIN = 24V, VGND = VPGND = 0V, CVIN = F, CVCC = 1 F, VEN = , CSS = 3300pF, VFB = x VOUT, LX = unconnected, RESET = unconnected, TA = -40 C to +125 C, unless otherwise noted.)

7 Typical values are at TA = +25 C. All voltages are referenced to GND, unless otherwise noted.)MAX17502 EEFFICIENCY vs. LOAD CURRENT, OUTPUT, FIGURE 7 CIRCUITLOAD CURRENT (mA)EFFICIENCY (%)9008006007003004005002006070809010010 01000 VIN = 36 VVIN = 24 VVIN = 12 VMAX17502 toc01 MAX17502 FEFFICIENCY vs. LOAD CURRENT, 5V OUTPUT, FIGURE 8 CIRCUITLOAD CURRENT (mA)EFFICIENCY (%)9008006007003004005002006070809010050 1001000 VIN = 12 VVIN = 24 VVIN = 36 VVIN = 48 VMAX17502 toc02 MAX17502 ELOAD AND LINE REGULATION, OUTPUT, FIGURE 7 CIRCUITLOAD CURRENT (mA)OUTPUT VOLTAGE (V) = 24 VVIN = 12 VVIN = 36V90080070060050040030020010001000 MAX17502 toc03 MAX17502 FLOAD AND LINE REGULATION,5V OUTPUT, FIGURE 8 CIRCUITLOAD CURRENT (mA)OUTPUT VOLTAGE (V) = 12 VVIN = 24 VVIN = 36 VVIN = 48 VMAX17502 toc04 SHUTDOWN CURRENTvs. TEMPERATUREMAX17502 toc05 TEMPERATURE ( C)SHUTDOWN CURRENT ( A) SWITCHING CURRENTvs. TEMPERATUREMAX17502 toc06 TEMPERATURE ( C)NO-LOAD SWITCHING CURRENT (mA) THRESHOLDvs.

8 TEMPERATUREMAX17502 toc07 TEMPERATURE ( C)EN/UVLO THRESHOLD VOLTAGE (V) VOLTAGEvs. TEMPERATURE (MAX17502E), OUTPUT, FIGURE 7 CIRCUITMAX17502 toc08 TEMPERATURE ( C)OUTPUT VOLTAGE (V) VOLTAGEvs. TEMPERATURE (MAX17502F), 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc09 TEMPERATURE ( C)OUTPUT VOLTAGE (V) Integrated , 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC ConverterTypical Operating Characteristics (continued)(VIN = 24V, VGND = VPGND = 0V, CVIN = F, CVCC = 1 F, VEN = , CSS = 3300pF, VFB = x VOUT, LX = unconnected, RESET = unconnected, TA = -40 C to +125 C, unless otherwise noted. Typical values are at TA = +25 C. All voltages are referenced to GND, unless otherwise noted.)FEEDBACK VOLTAGEvs. TEMPERATUREMAX17502 toc10 TEMPERATURE ( C)FEEDBACK VOLTAGE (V) AND RUNAWAY CURRENT LIMITvs. TEMPERATUREMAX17502 toc11 TEMPERATURE ( C)CURRENT LIMIT (A) FREQUENCYvs. TEMPERATUREMAX17502 toc12 TEMPERATURE ( C)SWITCHING FREQUENCY (kHz)100120806040200-2040030050060070020 0-40 SOFT-START/SHUTDOWN FROM EN/UVLO(MAX17502E), OUTPUT, FIGURE 7 CIRCUITMAX17502 toc131ms/divEN/UVLO2V/divVOUT1V/divIOUT5 00mA/divRESET2V/divSOFT-START/SHUTDOWN FROM EN/UVLO(MAX17502F), 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc141ms/divEN/UVLO2V/divVOUT2V/divIOUT5 00mA/divRESET5V/divFULL-LOAD SOFT-START FROM VIN(MAX17502E), OUTPUT, FIGURE 7 CIRCUITMAX17502 toc15400 s/divVIN20V/divVOUT1V/divIOUT500mA/divRE SET2V/divFULL-LOAD SOFT-START FROM VIN(MAX17502F), 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc16400 s/divVIN20V/divVOUT2V/divIOUT500mA/divRE SET5V/divMaxim Integrated , 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC ConverterTypical Operating Characteristics (continued)

9 (VIN = 24V, VGND = VPGND = 0V, CVIN = F, CVCC = 1 F, VEN = , CSS = 3300pF, VFB = x VOUT, LX = unconnected, RESET = unconnected, TA = -40 C to +125 C, unless otherwise noted. Typical values are at TA = +25 C. All voltages are referenced to GND, unless otherwise noted.)SOFT-START WITH 2V PREBIAS(MAX17502E), OUTPUT, FIGURE 7 CIRCUITMAX17502 toc17400 s/divEN/UVLO2V/divVOUT1V/divRESET2V/divS OFT-START WITH PREBIAS(MAX17502F), 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc18400 s/divEN/UVLO2V/divVOUT1V/divRESET5V/divL OAD TRANSIENT RESPONSE OF MAX17502E(LOAD CURRENT STEPPED FROM NO-LOAD TO 500mA), OUTPUT, FIGURE 7 CIRCUITMAX17502 toc1940 s/divVOUT (AC)50mV/divIOUT200mA/divLOAD TRANSIENT RESPONSE OF MAX17502F(LOAD CURRENT STEPPED FROM NO-LOAD TO 500mA), 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc2020 s/divVOUT100mV/divIOUT200mA/divLOAD TRANSIENT RESPONSE OF MAX17502E(LOAD CURRENT STEPPED FROM 500mA TO 1A), OUTPUT, FIGURE 7 CIRCUITMAX17502 toc2120 s/divVOUT (AC)50mV/divIOUT500mA/divLOAD TRANSIENT RESPONSE OF MAX17502F(LOAD CURRENT STEPPED FROM 500mA TO 1A)

10 , 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc2220 s/divVOUT100mV/divIOUT500mA/divMaxim Integrated , 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC ConverterTypical Operating Characteristics (continued)(VIN = 24V, VGND = VPGND = 0V, CVIN = F, CVCC = 1 F, VEN = , CSS = 3300pF, VFB = x VOUT, LX = unconnected, RESET = unconnected, TA = -40 C to +125 C, unless otherwise noted. Typical values are at TA = +25 C. All voltages are referenced to GND, unless otherwise noted.)BODE PLOT OF MAX17502 EAT 1A LOAD, OUTPUT, FIGURE 7 CIRCUITMAX17502 toc25fCR = = 53 45678912 MAX17502 toc 275V OUTPUT, 1A LOAD CU RR ENT,FIGURE 8 CI RCUIT, CONDU CTED EMI CU MITAVERAGE LIM ITAVERAGEEMISSIONSPEAKEMIS SIONSCOND UC TE D EMI(dB V)FR EQUENCY(MHz)10203040506070 MEASURED ON THE MAX17502 FTEVKIT WITH INPUT FILTER CIN = F, LIN = 10 HBODE PLOT OF MAX17502 FAT 1A LOAD, 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc26fCR = = 58 45678912 SWITCHING WAVEFORMS OF MAX17502 FAT 1A LOAD, 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc232 s/divVOUT (AC)50mV/divILX500mA/divLX20V/divOUTPUT OVERLOAD PROTECTIONOF MAX17502F, 5V OUTPUT, FIGURE 8 CIRCUITMAX17502 toc2420ms/divVOUT500mV/divIOUT500mA/divM AX1750260V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Integrated 9 Pin DescriptionPin ConfigurationsPINNAMEFUNCTIONTDFNTSSOP11 PGNDP ower Ground.