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MAX17544 Dataheets PDF



Part Number MAX17544
Manufacturers Maxim Integrated
Logo Maxim Integrated
Description Synchronous Step-Down DC-DC Converter
Datasheet MAX17544 DatasheetMAX17544 Datasheet (PDF)

MAX17544 EVALUATION KIT AVAILABLE 4.5V–42V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter With Internal Compensation General Description The MAX17544 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over 4.5V to 42V input. The converter can deliver up to 3.5A and generates output voltages from 0.9V up to 0.9 x VIN. The feedback (FB) voltage is accurate to within ±1.1% over -40°C to +125°C. The MAX17544 uses peak-current-mode c.

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MAX17544 EVALUATION KIT AVAILABLE 4.5V–42V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter With Internal Compensation General Description The MAX17544 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over 4.5V to 42V input. The converter can deliver up to 3.5A and generates output voltages from 0.9V up to 0.9 x VIN. The feedback (FB) voltage is accurate to within ±1.1% over -40°C to +125°C. The MAX17544 uses peak-current-mode control. The device can be operated in pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous conduction mode (DCM) control schemes. The device is available in a 20-pin (5mm x 5mm) TQFN package. Simulation models are available. Applications ●● Industrial Power Supplies ●● Distributed Supply Regulation ●● High-Voltage Single-Board Systems ●● Base Station Power Supply ●● General-Purpose Point-of-Load For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX17544.related. Benefits and Features ●● Reduces External Components and Total Cost • No Schottky—Synchronous Operation • Internal Compensation for Any Output Voltage • Built-In Soft-Start • All-Ceramic Capacitors, Compact Layout ●● Reduces Number of DC-DC Regulators to Stock • Wide 4.5V to 42V Input • Adjustable 0.9V to 0.9 x VIN Output • 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization ●● Reduces Power Dissipation • Peak Efficiency > 90% • PFM/DCM Enables Enhanced Light-Load Efficiency • 2.8µA Shutdown Current ●● Operates Reliably in Adverse Industrial Environments • Peak Current-Limit Protection • Built-In Output Voltage Monitoring with RESET • Programmable EN/UVLO Threshold • Monotonic Startup into Prebiased Load • Overtemperature Protection • -40°C to +125°C Operation Ordering Information appears at end of data sheet. Typical Application Circuit—5V, 500kHz Switching Frequency VIN (7.5V TO 42V) C2 2.2µF EN/UVLO VIN VIN RT SYNC MODE VCC SGND MAX17544 VIN BST LX LX LX FB RESET CF SS PGND PGND PGND C3 12000pF C1 2.2µF C8 2.2µF C5 0.1µF L1 10µH VOUT 5V, 3.5A C4 22µF C9 22µF R3 100kΩ fSW = 500kHz R4 22.1kΩ 19-7055; Rev 0; 9/14 MAX17544 4.5V–42V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter With Internal Compensation Absolute Maximum Ratings VIN to PGND..........................................................-0.3V to +48V EN/UVLO to SGND................................................-0.3V to +48V LX to PGND................................................-0.3V to (VIN + 0.3V) BST to PGND.........................................................-0.3V to +53V BST to LX..............................................................-0.3V to +6.5V BST to VCC............................................................-0.3V to +48V CF, RESET, SS, MODE, SYNC, RT to SGND......................................................-0.3V to +6.5V FB to SGND..........................................................-0.3V to +1.5V VCC to SGND........................................................-0.3V to +6.5V SGND to PGND.....................................................-0.3V to +0.3V LX Total RMS Current.........................................................±5.6A Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70ºC) (multilayer board) TQFN (derate 30.3mW/ºC above TA = +70ºC).......2424.2mW Operating Temperature Range.......................... -40°C to +125°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -65°C to +160°C Lead Temperature (soldering, 10s).................................. +300°C Soldering Temperature (reflow)........................................+260°C 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. Package Thermal Characteristics (Note 1) TQFN Junction-to-Ambient Thermal Resistance (θJA)...........30°C/W Junction-to-Case Thermal Resistance (θJC)..................2°C/W 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 www.maximintegrated.com/thermal-tutorial. Electrical Characteristics (VIN = VEN/UVLO = 24V, RRT = 40.2kΩ (500kHz), CVCC = 2.2μF, VPGND = VSGND = VMODE = VSYNC = 0V, LX = SS = RESET = open, VBST to VLX = 5V, VFB = 1V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to SGND, unless other.


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