Additional features such as adjustable switching frequency, synchronisation 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.
Features
- Synchronous Rectification
- Wettable Flanks QFN Package (WQFN)
- Low Quiescent Current
- 0.8µA in Shutdown (typical)
- 15µA in Active Mode with No Load (typical)
- Wide Voltage Conversion Range:
- tON_MIN = 60ns (typical)
- tOFF_MIN = 70ns (typical)
- Low MOSFET ON-Resistance:
- RDS_ON_HS = 53mΩ (typical)
- RDS_ON_LS = 31mΩ (typical)
- External Bias Input to Improve Efficiency
- Pin-Selectable Auto Mode or Forced PWM Operation
- Adjustable Frequency Range: 350kHz to 2.2MHz
- Synchronisable 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
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