MAXM17574

MAXM17574 MAXIM | Alldatasheet

Document overview

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Technical content

The Himalaya series of voltage regulator ICs and power modules enable cooler, smaller, and simpler power- supply solutions. The MAXM17574 is an easy-to-use power module that combines a synchronous step-down DC-DC converter, fully shielded inductor, and compen - sation components in a low-profile, thermally-efficient, system-in-package (SiP). The device operates over a wide input-voltage range of 4.5V to 60V, delivers up to 3A continuous output current, and has excellent line and load regulation over an output-voltage range of 0.9V to 15V. The device only requires five external components to complete the total power solution. The high level of inte - gration significantly reduces design complexity, manufac- turing risks, and offers a true plug-and-play power-supply solution, reducing time-to-market. The device can be operated in pulse-width modulation (PWM) or discontinuous conduction mode (DCM). The MAXM17574 is available in a low-profile, highly ther - mal-emissive, compact, 33-pin, 9mm x 15mm x 2.92mm SiP package that reduces power dissipation in the package and enhances efficiency. The feedback voltage- regulation accuracy over -40°C to +125°C is ±0.9%. The package is easily soldered onto a printed circuit board and suitable for automated circuit board assembly.

Applications

Industrial Power Supplies
Distributed Supply Regulation
FPGA and DSP Point-of-Load Regulator
Base Station Point-of-Load Regulator
HVAC and Building Control Ordering Information appears at end of data sheet. 19-100076; Rev 1; 9/17 Benefits and Features
Reduces Design Complexity, Manufacturing Risks, and Time-to-Market
Integrated Synchronous Step-Down DC-DC converter
Integrated Inductor
Integrated Compensation Components
Saves Board Space in Space-Constrained
Complete Integrated Step-Down Power Supply in a Single Package
Small Profile 9mm x 15mm x 2.92mm SiP Package
Simplified PCB Design with Minimal External BOM Components
Offers Flexibility for Power-Design Optimization
Wide Input-Voltage Range from 4.5V to 60V
Output-Voltage Adjustable Range from 0.9V to 15V
Adjustable Frequency with External Frequency Synchronization (100kHz to 2.2MHz)
Soft-Start Programmable
Auxiliary bootstrap LDO for improved Efficiency
Optional Programmable EN/UVLO
Operates Reliably in Adverse Industrial Environments
Integrated Thermal Protection
Hiccup Mode Overload Protection
RESET Output-Voltage Monitoring
High Industrial Ambient Operating Temperature Range (-40°C to +125°C) / Junction Temperature Range (-40°C to +150°C) Typical Application Circuit OUT MAXM17574 47µF 3.3V, 3A 105kΩ 39.2kΩ PGND EN/UVLO 0.022µF VIN 4.7µF 4.5V TO 60V SS SGND MODE/SYNC LX BST EXTVCC VCC RESET RT CF FB MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor EVALUATION KIT AVAILABLE

Stresses 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. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 1: Junction temperature greater than +125°C degrades operating lifetimes. Note 2: Package thermal resistance is measured on evaluation board with natural convection. PACKAGE TYPE: 33-PIN SiP Package Code L33915#3 Outline Number 21-100175 Land Pattern Number 90-100057 THERMAL RESISTANCE, FOUR-LAYER BOARD (Note 2) Junction to Ambient Thermal Resistance (θJA) 22.6°C/W For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.

Package Information

www.maximintegrated.com Maxim Integrated │ 2 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

(VIN = V EN/UVLO = 24V, R RT = 40.2kΩ (f SW = 500kHz), V SGND = V PGND = V MODE/SYNC = V EXTVCC = 0V, V FB = 1V, SS = CF = RESET = LX = OUT = BST = VCC = OPEN, T A = -40°C to 125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to SGND, unless otherwise noted.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS INPUT SUPPLY (VIN) Input Voltage Range VIN 4.5 60 V Input Shutdown Current IIN-SH VEN/UVLO = 0V, shutdown mode 10 15 μA Input Quiescent Current IQ_DCM DCM Mode, VLX = 0.1V 1.2 1.8 mA IQ_PWM Normal Switching Mode, fSW = 650kHz, VOUT = EXTVCC = 5V 12.5 ENABLE/UVLO (EN) EN/UVLO Threshold VENR VEN/UVLO rising 1.19 1.215 1.26 VVENF VEN/UVLO falling 1.068 1.09 1.131 VEN-TRUESD VEN/UVLO falling, true shutdown 0.8 Enable Pullup resistor RENP Pullup resistor between IN and EN/UVLO pins 3.15 3.3 3.45 MΩ LDO (VCC) VCC Output-Voltage Range VCC 1mA < IVCC < 25mA 4.75 5 5.25 V 6V ≤ VIN ≤ 60V; IVCC=1mA 4.75 5 5.25 VCC Current Limit IVCC(MAX) VCC = 4.3V, VIN = 7V 40 65 130 mA VCC Dropout VCC(DO) VIN = 4.5V, IVCC = 20mA 0.3 V VCC UVLO VCC(UVR) Rising 4.05 4.2 4.3 V VCC(UVF) Falling 3.65 3.8 3.9 EXT LDO (EXTVCC) EXTVCC Operating Voltage Range 4.84 24 V EXTVCC Switchover Threshold EXTVCC rising 4.55 4.7 4.84 V EXTVCC falling 4.3 4.48 4.6 EXTVCC Dropout EXTVCC(DO) EXTVCC = 4.85V, IVCC = 20mA 0.4 V EXTVCC Current Limit IVCC(MAX) VCC = 4.5V, EXTVCC = 8V 40 80 150 mA SOFT-START (SS) Charging Current ISS VSS = 0.5V 4.7 5 5.3 μA OUTPUT SPECIFICATION Line-Regulation Accuracy VIN = 10V to 60V, VOUT = 5V 0.1 mV/V Load-Regulation Accuracy IOUT = 0A to 1.5A 1 mV/A FB Regulation Voltage VFB_REG MODE/SYNC = SGND or VCC 0.892 0.9 0.908 V FB Input Leakage Current IFB VFB = 1V, TA = 25°C -50 50 nA VFB Undervoltage Trip Level to Cause HICCUP VOUT(HICF) 0.56 0.58 0.65 V HICCUP Timeout 32768 Cycles

Electrical Characteristics

www.maximintegrated.com Maxim Integrated │ 3 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

Note 3: Electrical specifications are production tested at T A = +25°C. Specifications over the entire operating temperature range are guaranteed by design and characterization. (VIN = V EN/UVLO = 24V, R RT = 40.2kΩ (f SW = 500kHz), V SGND = V PGND = V MODE/SYNC = V EXTVCC = 0V, V FB = 1V, SS = CF = RESET = LX = OUT = BST = VCC = OPEN, T A = -40°C to 125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to SGND, unless otherwise noted.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS MODE/SYNC MODE Threshold VM(DCM) MODE/SYNC = VCC (DCM Mode) VCC - 0.65 V VM(PWM) MODE/SYNC = SGND (PWM Mode) 0.75 SYNC Frequency Capture Range 1.1 x fSW 1.4 x fSW kHz SYNC Pulse Width 50 ns SYNC Threshold VIH 2.1 V VIL 0.8 CURRENT LIMIT Average Current-Limit Threshold IAVG-LIMIT VOUT = 5V, fSW = 650kHz 4.6 A RT Switching Frequency fSW RRT = OPEN 460 500 540 kHz RRT = 40.2k 475 500 525 RRT = 8.06K 1950 2200 2450 RRT = 210K 90 100 110 Minimum On-Time tON(MIN) 60 80 ns Minimum Off-Time tOFF(MIN) 140 160 ns RESET RESET Output Level Low IRESET = 10mA 0.4 V RESET Output leakage Current TA = TJ = +25°C, VRESET = 5.5V -0.1 0.1 μA FB Threshold for RESET Deassertion VFB-OKR VFB rising 93.8 95 97.8 % FB Threshold for RESET Assertion VFB-OKF VFB falling 90.5 92 94.6 % RESET Deassertion Delay After FB Reaches 95% Regulation

1024 Cycles

THERMAL SHUTDOWN (TEMP) Thermal Shutdown Threshold Temperature rising 165 °C Thermal Shutdown Hysteresis 10 °C Electrical Characteristics (continued) www.maximintegrated.com Maxim Integrated │ 4 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

(VIN = V EN/UVLO = 24V, V GND = V PGND = 0V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless otherwise noted.) Typical Operating Characteristics 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc01 VIN = 4.5V VIN = 12V MODE: PWM VOUT = 0.9V 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc04 VIN = 4.5V VIN = 24V MODE: PWM VOUT = 2.5V VIN = 12V VIN = 48V 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc07 VIN = 60V VIN = 48V MODE: PWM VOUT = 8V VIN = 24V 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc02 VIN = 24V VIN = 4.5V VIN = 12V MODE: PWM VOUT = 1.2V 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc05 VIN = 24V VIN = 4.5V VIN = 12V VIN = 48V VIN = 60V MODE: PWM VOUT = 3.3V 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc08 VIN = 60V VIN = 24V MODE: PWM VOUT = 12V VIN = 48V 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc03 VIN = 36V VIN = 4.5V VIN = 24V MODE: PWM VOUT = 1.8V VIN = 12V 100 0 500 1000 1500 2000 2500 3000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc06 VIN = 24V VIN = 12V VIN = 48V VIN = 60V MODE: PWM VOUT = 5V 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc09 VIN = 4.5V VIN = 12V MODE: DCM VOUT = 0.9V Maxim Integrated │ 5 www.maximintegrated.com MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

(VIN = V EN/UVLO = 24V, V GND = V PGND = 0V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless otherwise noted.) Typical Operating Characteristics (continued) 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc10 VIN = 24V VIN = 4.5V VIN = 12V MODE: DCM VOUT = 1.2V 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc11 VIN = 36V VIN = 4.5V VIN = 24V MODE: DCM VOUT = 1.8V VIN = 12V 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc12 VIN = 4.5V VIN = 24V MODE: DCM VOUT = 2.5V VIN = 12V VIN = 48V 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc13 VIN = 24V VIN = 4.5V VIN = 12V VIN = 48V VIN = 60V MODE: DCM VOUT = 3.3V 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc14 VIN = 24V VIN = 12V VIN = 48V VIN = 60V MODE: DCM VOUT = 5V 0 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc15 VIN = 60V VIN = 24V MODE: DCM VOUT = 8V VIN = 48V 100 10 100 1000 EFFICIENCY (%) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT toc16 VIN = 60V VIN = 24V MODE: DCM VOUT = 12V VIN = 48V 3.29 3.298 3.306 3.314 3.322 3.33 0 500 1000 1500 2000 2500 3000 OUTPUT VOLT AGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc17 VIN = 4.5V VIN = 60V VIN = 48V VIN = 24VVIN = 12V MODE: PWM VOUT = 3.3V 3.292 3.298 3.304 3.31 3.316 3.322 3.328 0 500 1000 1500 2000 2500 3000 OUTPUT VOLT AGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc18 VIN = 4.5V VIN = 60VVIN = 48V VIN = 24VVIN = 12V MODE: DCM VOUT = 3.3V Maxim Integrated │ 6 www.maximintegrated.com MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

(VIN = V EN/UVLO = 24V, V GND = V PGND = 0V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless otherwise noted.) Typical Operating Characteristics (continued) 5.05 5.055 5.06 5.065 5.07 5.075 5.08 5.085 5.09 0 500 1000 1500 2000 2500 3000 OUTPUT VOLT AGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc19 VIN = 60V VIN = 48V VIN = 24VVIN = 12V MODE: PWM VOUT = 5V 5.05 5.058 5.066 5.074 5.082 5.09 0 500 1000 1500 2000 2500 3000 OUTPUT VOLT AGE (V) LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT toc20 VIN = 60V VIN = 48V VIN = 24V VIN = 12V MODE: DCM VOUT = 5V 3.3 3.305 3.31 3.315 3.32 0 5 10 15 20 25 30 35 40 45 50 55 60 OUTPUT VOLT AGE (V) INPUT VOLT AGE (V) OUTPUT VOLTAGE vs. INPUT VOLTAGE toc21 IOUT = 0A IOUT = 3A IOUT = 1.5A MODE: PWM VOUT = 3.3V 5.06 5.062 5.064 5.066 5.068 5.07 5.072 5.074 5.076 5.078 5.08 0 5 10 15 20 25 30 35 40 45 50 55 60 OUTPUT VOLT AGE (V) INPUT VOLT AGE (V) OUTPUT VOLTAGE vs. INPUT VOLTAGE toc22 IOUT = 0A IOUT = 1.5A IOUT = 3A MODE: PWM VOUT = 5V toc23 2µs/div VOUT (AC) 20mV/div OUTPUT-VOLTAGE RIPPLE (FULL LOAD) MODE: PWM VOUT = 3.3V toc24 1µs/div VOUT (AC) 10mV/div OUTPUT-VOLTAGE RIPPLE FULL LOAD MODE: PWM VOUT = 5V 100mV/div 2A/div toc25 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE (LOAD CURRENT STEPPED FROM 0A TO 1.5A) MODE: PWM VOUT = 3.3V 100mV/div 2A/div toc26 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE (LOAD CURRENT STEPPEDFROM 1.5A TO 3A) MODE: PWM VOUT = 3.3V 100mV/div 2A/div toc27 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE (LOAD CURRENT STEPPED FROM 0A TO 1.5A) MODE: PWM VOUT = 5V Maxim Integrated │ 7 www.maximintegrated.com MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

(VIN = V EN/UVLO = 24V, V GND = V PGND = 0V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless otherwise noted.) Typical Operating Characteristics (continued) 100mV/div 2A/div toc28 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE (LOAD CURRENT STEPPED FROM 1.5A TO 3A) MODE: PWM VOUT = 5V 100mV/div 1A/div toc29 100µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE (LOAD CURRENT STEPPED FROM 50mA TO 1.5A) MODE: DCM VOUT = 3.3V 100mV/div 1A/div toc30 200µs/div VOUT (AC) IOUT LOAD TRANSIENT RESPONSE (LOAD CURRENT STEPPED FROM 50mA TO 1.5A) MODE: DCM VOUT=5V 5V/div toc31 1ms/div VEN/UVLO VOUT 20V/div 5V/div STARTUP THROUGH ENABLE (LOAD RESISTANCE = 1.1Ω) LX 2V/div MODE: PWM VOUT = 3.3V RESET toc32 1µs/div VOUT 20V/div STEADY-STATE SWITCHING WAVEFORMS LX 2V/div MODE: PWM VOUT = 3.3V 5V/div toc33 100µs/div VEN/UVLO VOUT 20V/div 5V/div SHUTDOWN THROUGH ENABLE (LOAD RESISTANCE = 1.1Ω) LX 2V/div RESET MODE: PWM VOUT = 3.3V 5V/div toc34 2ms/div VEN/UVLO VOUT 20V/div 5V/div STARTUP THROUGH ENABLE (LOAD RESISTANCE = 1.67Ω) LX 2V/div MODE: PWM VOUT = 5VRESET toc35 1µs/div VOUT 20V/div 5V/div STEADY-STATE SWITCHING WAVEFORMS LX MODE: PWM VOUT = 5V 5V/div toc36 100µs/div VEN/UVLO VOUT 20V/div 5V/div SHUTDOWN THROUGH ENABLE (LOAD RESISTANCE = 1.67Ω) LX 5V/div RESET MODE: PWM VOUT = 5V Maxim Integrated │ 8 www.maximintegrated.com MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

(VIN = V EN/UVLO = 24V, V GND = V PGND = 0V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless otherwise noted.) Typical Operating Characteristics (continued) 5V/div toc37 4ms/div VEN/UVLO VOUT 20V/div 5V/div START-UP INTO PREBIAS 2.5V TO VO = 5V (NO-LOAD PWM) LX 5V/div MODE: PWM VOUT = 5V RESET 20V/div toc38 20ms/div VOUT 200mV/div OUTPUT SHORT DURING STARTUP 20V/div LX VIN MODE: PWM VOUT = 3.3V IOUT 20V/div toc39 20ms/div SHORT VOUT 5V/div OUTPUT SHORT IN STEADY STATE (LOAD CURRENT 3A) 5V/div LX 2A/divIOUT MODE: PWM VOUT = 3.3V 20V/div toc40 20ms/div VOUT 200mV/div OUTPUT SHORT DURING STARTUP 20V/div LX VIN MODE: PWM VOUT = 5V IOUT 5A/div 20V/div toc41 20ms/div SHORT VOUT 5V/div OUTPUT SHORT IN STEADY STATE (LOAD CURRENT 3A) 5V/div LX IOUT 5A/div MODE: PWM VOUT = 5V 2V/div toc42 4µs/div 20V/div 5V/div LX SYNC MODE: PWM VOUT = 3.3V CONNECTED 22pF FROM CF TO SGND EXTERNAL SYNCHRONIZATION (LOAD CURRENT 3A) VOUT 2V/div toc43 2µs/div 20V/div EXTERNAL SYNCHRONIZATION (LOAD CURRENT 3A) 5V/div LX SYNC VOUT MODE: PWM VOUT=5V CONNECTED 22pF FROM CF TO SGND toc44 400µs/div VCC CHANGE OVER FROM VIN TO EXTVCC 1V/div VCC 1V/div VOUT MODE: PWM VOUT = 5V toc45 FREQUENCY(Hz) BODE PLOT VIN = 12V, VOUT = 0.9V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 -40 103 105 100 CROSSOVER FREQUENCY = 52.1kHz, PHASE MARGIN = 59.7° 104 -50 Maxim Integrated │ 9 www.maximintegrated.com MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

(VIN = V EN/UVLO = 24V, V GND = V PGND = 0V, T A = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C. All voltages are referenced to GND, unless otherwise noted. The circuit values for different output voltage applications are as in Table 1, unless otherwise noted.) Typical Operating Characteristics (continued) toc46 FREQUENCY(Hz) BODE PLOT VIN = 12V, VOUT = 1.2V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 -40 103 105 -50 100 CROSSOVER FREQUENCY = 55.4kHz, PHASE MARGIN = 61.24° 104 toc47 FREQUENCY (Hz) BODE PLOT VIN = 24V, VOUT = 1.8V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 -30 -10 -20 103 104 105 -40 100 CROSSOVER FREQUENCY = 53.6kHz PHASE MARGIN = 63.2° 120 toc48 FREQUENCY (Hz) BODE PLOT VIN = 24V, VOUT = 2.5V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 103 104 105 -20 100 CROSSOVER FREQUENCY = 50.9kHz PHASE MARGIN = 63.2° toc49 FREQUENCY(Hz) BODE PLOT VIN = 24V, VOUT = 3.3V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 -30 -10 -50 103 104 105 -100 100 -40 CROSSOVER FREQUENCY = 65.4kHz PHASE MARGIN = 60° toc50 FREQUENCY (Hz) BODE PLOT VIN = 24V, VOUT = 5V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 -50 103 104 105 -100 100 -40 150 CROSSOVER FREQUENCY = 59.1kHz PHASE MARGIN = 68.3° toc51 FREQUENCY(Hz) BODE PLOT VIN = 24V, VOUT = 8V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 -10 -20 103 104 105 -40 100 CROSSOVER FREQUENCY = 59kHz PHASE MARGIN = 70.68° toc52 FREQUENCY (Hz) BODE PLOT VIN = 24V, VOUT = 12V, IOUT = 3A GAIN (dB) PHASE MARGIN (°) -20 -50 103 104 105 -100 100 -40 150 CROSSOVER FREQUENCY = 52.1kHz PHASE MARGIN = 70.8° 0.5 1.5 2.5 3.5 0 20 40 60 80 100 120 140 OUTOPUT CURRENT (A) AMBIENT TEMPERATURE (°C) OUTPUT CURRENT vs. AMBIENT TEMPERATURE toc53 VOUT = 12V VOUT = 3.3V VOUT = 5V Maxim Integrated │ 10 www.maximintegrated.com MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

10 11 12 1713 14 15 16 1887 32 31 30 29 2428 27 26 25 2333 NC NC EN/ UVLO PGND VCC RESET MODE/ SYNC SS CF FB BSTEXTVCCSGNDRT LX NC NC OUT NC NC NC OUT OUT OUTOUTOUTOUTOUTPGNDPGNDPGNDV IN VIN EP3 33-PIN SiP 9mm × 15mm × 2.92mm TOP VIEW MAXM17574 www.maximintegrated.com Maxim Integrated │ 11 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

1, 2, 16-20, EP3 NC Not connected 3 EN/UVLO Enable/Undervoltage-Lockout Input. Connect a resistor from EN/UVLO to SGND to set the UVLO threshold. See the Input Undervoltage-Lockout Level section for more details. 4, 29-31 PGND Power Ground. Connect the PGND pins to the power ground plane.

5 VCC

5V LDO Output. The VCC is bypassed to PGND internally through a 2.2µF capacitor. Do not connect any external components to the VCC pin. 6 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.

7 MODE/SYNC

Configures Device Mode of Operation. MODE pin configures the device to operate either in PWM or DCM modes of operation. Connect MODE to SGND for constant-frequency PWM operation at all loads. Connect MODE to VCC for DCM operation. The device can be synchronized to an external clock using this pin. See the Mode Selection (MODE) section and the External Frequency Synchronization section for more details. 8 SS Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start time. 9 CF Compensation Pin. Connect a capacitor from CF to FB when the switching frequency is below 500kHz. Leave CF open for switching frequency greater than 500kHz. See the Loop Compensation section for more details. 10 FB Feedback Input. Connect FB to the center tap of an external resistor-divider from the output to SGND to set the output voltage. See the Adjusting Output Voltage section for more details 11 RT Pin for Programming Switching Frequency. Connect a resistor from RT to SGND to set the regulator’s switching frequency between 100kHz and 2.2MHz. Leave RT open for the default 500kHz frequency. See the Setting the Switching Frequency section for more details. 12 SGND Analog Ground pin. 13 EXTVCC External Power Supply Input for the Internal LDO. Applying a voltage between 4.84V and 24V at EXTVCC pin bypasses the internal LDO and improves the efficiency. 14 BST Boost Flying Capacitor. Internally a 0.1µF is connected from BST to LX. Do not connect any externalcomponents to BST pin. 15 LX Switching Node. Do not connect any external components to the LX pin. 21-28 OUT Regulator Output Pin. Connect required capacitor from OUT to PGND. 32-33 VIN Power-Supply Input. Connect the VIN pins together. Decouple to PGND with a capacitor. Place the capacitor close to the VIN and PGND pins. EP1 SGND Exposed Pad. Connect to the SGND of the Module. Connect to a large copper plane below the IC to improve heat dissipation capability. EP2 OUT Exposed Pad. Connect this pad to the OUT pin of the Module. Connect to a large copper plane below the Module to improve heat dissipation capability. Pin Description www.maximintegrated.com Maxim Integrated │ 12 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

4.7µF 0.1µF 0.22µF 2.2µF 3.3MΩ 1.215V HICCUP VIN MAXM17574 6.8µH 0.1µF 0.1µF SGND 4.7Ω 0.1µF SLOPE COMPENSATION VIN Functional Diagram www.maximintegrated.com Maxim Integrated │ 13 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

The MAXM17574 is a high-efficiency, high-voltage step- down power module with dual-integrated MOSFETs that operates over a 4.5V to 60V input and supports a pro - grammable output voltage from 0.9V to 15V, delivering up to 3A current. The module integrates all the necessary components required for the switching converter. Built-in compensation for the entire output-voltage range elimi - nates the need for external components. The device features a peak-current-mode control architec- ture with a MODE feature that can be used to operate the device in pulse-width modulation (PWM) or discontinuous- conduction mode (DCM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. DCM features constant frequency operation and disables negative inductor currents at light loads. DCM operation offers higher efficiency at light loads than PWM mode. A 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. An open-drain RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage. Mode Selection (MODE) The logic state of the MODE pin is latched when VCC and EN/UVLO voltages exceed the respective UVLO rising thresholds and all internal voltages are ready to allow LX switching. If the MODE pin is grounded during power-up, the device operates in constant frequency PWM mode at all loads. If the MODE pin is connected to V CC dur- ing power-up, the device operates in constant frequency DCM mode at light loads. State changes on the MODE pin are ignored during normal operation. Modes of Operation PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to variable switching frequency. In PWM mode, the inductor current is allowed to go negative. DCM mode of operation doesn’t allow the inductor current to go negative. Because of this, the PWM mode of operation gives lower efficiency at light loads compared to DCM mode of operation. Setting the Switching Frequency The switching frequency of the device can be pro - grammed from 100kHz to 2.2MHz by using a resistor con- nected from the RT pin to SGND. The switching frequency (fSW) is related to the resistor(R RT) connected between RT and SGND pins by the following equation: RT SW 21 10R 1.7f ×= − where RRT is in kΩ and fSW is in kHz. Leaving the RT pin open causes the device to operate at the default switching frequency of 500kHz. External Frequency Synchronization The inte rnal oscillator of the MAXM17574 can be syn - chronized to an external clock signal on the MODE/ SYNC pin. The external synchronization clock frequency must be between 1.1 × f SW and 1.4 × f SW, where f SW is the frequency programmed by the R RT resistor. When an external clock is applied to MODE/SYNC pin, the internal oscillator frequency changes to external clock frequency (from original frequency based on RT setting) after detecting 16 external clock edges. The converter operates in PWM mode during synchronization operation. When the external clock is applied on-fly then the mode of operation changes to PWM from the initial state of DCM/ PWM. When the external clock is removed on-fly then the internal oscillator frequency changes to the RT set frequency and the converter still continues to operate in PWM mode until either power cycling or enable cycling. For applications that need external clock synchronization, a 22pF capacitor should be connected from the CF to the SGND pin for robust operation. The minimum external clock pulse-width high should be greater than 50ns. See the MODE/SYNC section in th e Electrical Characteristics table for details. Linear Regulator (VCC and EXTVCC) The MAX M17574 has two internal low-dropout (LDO) regulators that powers V CC. During power-up, when the EN/UVLO pin voltage is above the true shutdown volt - age, then the V CC is powered from INLDO. When V CC voltage is above the V CC UVLO threshold and EXTVCC voltage is greater than 4.7V the V CC is powered from EXTVCC LDO. Only one of the two LDOs is in opera - tion at a time, depending on the voltage levels present at EXTVCC. Powering VCC from EXTVCC increases effi- ciency at higher input voltages. EXTVCC voltage should not exceed 24V. Typical V CC output voltage is 5V. Internally, V CC is bypassed with a 2.2μF ceramic capacitor to PGND. See the Electrical Characteristics table for the current limit details for both the regulators. In applications where the buck converter output is connected to the EXTVCC pin, if the output is shorted to ground, then the transfer from EXTVCC LDO to INLDO happens seamlessly without any impact on the normal functionality. www.maximintegrated.com Maxim Integrated │ 14 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

The minimum and maximum operating input voltages for a given output voltage should be calculated as follows: ( ) ( )( ) ( )OUT OUT IN(MIN) OUT SW(MAX) OFF MAX V I 0.195V I 0.075 1f t +×= +× OUTIN(MAX) SW(MAX) ON(MIN) VV ft= × where, VOUT = Steady-state output voltage, IOUT = Maximum load current fsw(MAX) = Maximum switching frequency, tOFF(MAX) = Worst-case minimum switch off-time (160ns), tON(MIN) = Worst-case minimum switch on-time (80ns). Table 1 provides operating input-voltage range and the optimum switching frequency for different selected output voltages. RESET Output The device includes a RESET comparator to monitor the output voltage. The open-drain RESET output requires an external pullup resistor. RESET goes high (high imped - ance) 1024 switching cycles after the regulator output increases above 95% of the designed nominal regulated voltage. RESET goes low when the regulator output volt - age drops to below 92% of the nominal regulated voltage. RESET also goes low during thermal shutdown. Thermal Shutdown Protection Thermal shutdown protection limits total power dis - sipation in the device. When the junction temperature of the device exceeds +165°C (typ), a thermal sen - sor shuts down the device, allowing the device to cool. The thermal sensor turns the device on again after the junction temperature cools by 10°C. Soft-start resets during thermal shutdown. Carefully evaluate the total power dissipation (see the Power Dissipation and Output-Current Derating section) to avoid unwanted triggering of the thermal shutdown protection in normal operation. Overcurrent Protection (OCP) / Hiccup Mode The device is provided with a robust overcurrent pro - tection (OCP) scheme that protects the device under overload and output short-circuit conditions. When the overcurrent occurs, the module enters hiccup mode of operation. In hiccup mode, the converter is protected by suspending switching for a hiccup timeout period of 32,768 clock cycles. Once the hiccup timeout period expires, soft-start is attempted again. Hiccup mode of operation ensures low power dissipation under output short-circuit conditions. Applications Information Input-Capacitor Selection The input capacitor serves to reduce the current peaks drawn from the input power supply and reduces switching noise to the IC. The input capacitor values in Table 1 are the minimum recommended values for desired input and output voltages. Applying capacitor values larger than those indicated in Table 1 are acceptable to improve the dynamic response. For other operating conditions, the total input capacitance must be greater than or equal to the value given by the following equation in order to keep the input-voltage ripple within specifications and minimize the high-frequency ripple current being fed back to the input source: ( )OUT(MAX) IN SW IN I D 1D C fV ××− = η× ×∆ where, D = The duty ratio of the controller (V OUT/VIN), fSW = The switching frequency, ΔVIN = The allowable input voltage ripple, IOUT(MAX) = The maximum load current, η = The efficiency. In applications, where the source is located distant from the device input, an electrolytic capacitor should be added in parallel to the ceramic capacitor to provide necessary damping for potential oscillations caused by the inductance of the longer input power path and input ceramic capacitor. www.maximintegrated.com Maxim Integrated │ 15 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

capacitor should be connected from the SS pin to SGND. age for each desired output voltage. their stability over temperature in industrial applications. frequency is more than 500kHz, select f C to be 55kHz. COUT = Actual derated value of output capacitance (μF). Figure 1. Setting the Input Undervoltage-Lockout Level

Table 1. Selection of Components Figure 2. Setting the Output Voltage

Table 2 to select the value of capacitor (C CF). mum allowed junction temperature. TJMAX = Maximum allowed junction temperature. TA = Operating ambient temperature. θJA = Junction to ambient thermal resistance. data sheet for a good sample layout. possible to MAXM17574 respective pins. VIN and PGND of the MAXM17574. OUT and PGND of the MAXM17574. copper pour or plane area (GND) on the top layer. external components and the MAXM17574. pads decreases the heat-dissipating capability. Table 2. Loop Compensation

47µF 4.7µF 0.022µF 5V,3A10V to 60V 140kΩ 30.1kΩ R1 487kΩ 10kΩ 30.1kΩ C1-GRM32ER71K475KE14 C2-GRM32ER71A476KE15 SWITCHING FREQUENCY 650kHz SGND Typical Application Circuits Typical Application Circuit-5V Output Application www.maximintegrated.com Maxim Integrated │ 19 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

PART NUMBER TEMP RANGE PIN-PACKAGE MAXM17574ALC#T -40°C to +125°C 33 SiP # Denotes a RoHS-compliant device that may include lead(Pb) that is exampt under the RoHS requirements. T = Tape and reel.

Ordering Information

SWITCHING FREQUENCY 500KHZ VIN OUT EN/UVLO SS RT EXTVCC PGND LX RESET MODE/SYNC CF BST VCC FB MAXM17574 47µF 4.7µF 0.022µF 3.3V,3A4.5V to 60V 105kΩ 39.2kΩ 10kΩ SGND Typical Application Circuits (continued) Typical Application Circuit-3.3V Output Application www.maximintegrated.com Maxim Integrated │ 20 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor

0 6/17 Initial release — 1 9/17 Updated Package Information table, Ordering Information table, and Table 1. Updated Linear Regulator (VCC and EXTVCC) section. 1, 14, 17, 20

Revision History

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2017 Maxim Integrated Products, Inc. │ 21 MAXM17574 4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

Summary

4.5V to 60V, 3A High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor Rev 1; 9/17

Description