LM73606RNPR

The LM73605/LM73606 series synchronous step-down DC/DC converters are easy to use and can drive load currents up to 5A (LM73605) or 6A (LM73606) from supply voltages ranging from 3.5V to 36V. The LM73605/LM73606 deliver excellent efficiency and output accuracy in an extremely compact solution size. Peak current mode control is employed. Additional features including adjustable switching frequency, external clock synchronization, FPWM option, power-good flag, precision enable, adjustable soft-start, and tracking provide a flexible and easy-to-use solution for a wide range of applications. Automatic frequency foldback at light loads and an optional external bias supply improve efficiency across the full load range. The product family requires minimal external components, and the pinout is designed to simplify PCB layout for optimum 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, enabling simple current scaling.

Applications

• Industrial distributed power applications
• Telecom systems
• General wide input voltage applications

Key features

• Synchronous rectification
• Wettable flank QFN package (WQFN)
• Low quiescent current: 0.8μA (typical) in shutdown mode, 15μA (typical) in no-load active mode
• Wide conversion voltage 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 pin for improved efficiency
• Selectable auto mode or forced PWM operation
• Adjustable frequency range: 350kHz to 2.2MHz
• Synchronizable to external clock
• Internal compensation
• Power good flag
• Precision enable for system UVLO programming
• Flexible soft-start: pre-biased load startup, fixed or adjustable soft-start time, output voltage tracking
• Cycle-by-cycle current limiting
• Short-circuit protection with hiccup mode
• Thermal shutdown protection
• Create custom designs using LM73605 or LM73606 with WEBENCH Power Designer