LM73605RNPR

The LM73605/LM73606 family of devices are easy-to-use synchronous step-down DC-DC converters capable of driving up to 5 A (LM73605) or 6 A (LM73606) of load current from a supply voltage ranging from 3.5 V to 36 V. The LM73605/LM73606 provide exceptional efficiency and output accuracy in a very small solution size. Peak current-mode control is employed. Additional features such as adjustable switching frequency, synchronization to an external clock, FPWM option, power-good flag, precision enable, adjustable soft start, and tracking provide both flexible and easy-to-use solutions for a wide range of applications. Automatic frequency foldback at light load and optional external bias improve efficiency over the entire load range. The family requires few external components and has a pinout designed for simple PCB layout with optimal EMI and thermal performance. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limiting, and hiccup short-circuit protection. The LM73605 and LM73606 devices are pin-to-pin compatible for easy current scaling.

Applications

• Industrial Distributed Power Applications
• Telecommunications Systems
• General-Purpose Wide VIN Regulation

Key features

• Synchronous Rectification
• Wettable Flanks QFN Package (WQFN)
• Low Quiescent Current: 0.8 μA in Shutdown (typical), 15 μA in Active Mode with No Load (typical)
• Wide Voltage Conversion Range: tON_MIN = 60 ns (typical), tOFF_MIN = 70 ns (typical)
• Low MOSFET ON-Resistance: RDS_ON_HS = 53 mΩ (typical), RDS_ON_lS = 31 mΩ (typical)
• External Bias Input to Improve Efficiency
• Pin-Selectable Auto Mode or Forced PWM Operation
• Adjustable Frequency Range: 350 kHz to 2.2 MHz
• Synchronizable to External Clock
• Internal Compensation
• Power-Good Flag
• Precision Enable to Program System UVLO
• Flexible Soft-Start Features: Start-up into Pre-Biased Load, Fixed or Adjustable Soft-Start Time
• Output Voltage Tracking
• Cycle-by-Cycle Current Limiting
• Short-Circuit Protection With Hiccup Mode
• Thermal Shutdown Protection
• Create a Custom Design With the WEBENCH Power Designer using LM73605 or LM73606