LM73605/LM73606 Synchronous Step-Down Voltage Converters

Texas Instruments' LM73605, LM73606, LM73605-Q1, and LM73606-Q1 are 3.5 V to 36 V, 5 A synchronous step-down voltage converters

Image of Texas Instruments' LM73605/LM73606 Synchronous Step-Down Voltage ConvertersTexas Instruments' LM73605, LM73606, LM73605-Q1, and LM73606-Q1 family of devices are easy-to-use synchronous step-down DC-DC converters capable of driving up to 5 A (LM73605 and LM73605-Q1) or 6 A (LM73606 and LM73606-Q1) of load current from a supply voltage ranging from 3.5 V to 36 V. The LM73605, LM73606, LM73605-Q1, and LM73606-Q1 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, LM73606, LM73605-Q1, and LM73606-Q1 devices are pin-to-pin compatible for easy current scaling.

The LM73605EVM-5V-2MHZ evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM73605 synchronous step-down voltage converter. The EVM operates from 6 V to 36 V input and provides a 5 V output voltage with 5 A maximum load current.

  • AEC-Q100 qualified for automotive applications (LM73605-Q1 and LM73606-Q1)
    • Device temperature Grade 1: -40°C to +125°C junction operating temperature
    • Device HBM ESD Classification Level 2 kV
    • Device CDM ESD Classification Level C5
  • Synchronous rectification
  • Wettable flanks QFN package (WQFN)
  • Low quiescent current
    • 0.8 µA in shutdown (typ.)
    • 15 µA in active mode with no load (typ.)
  • Wide voltage conversion range:
    • tON_MIN = 60 ns (typ.)
    • tOFF_MIN = 70 ns (typ.)
  • Low MOSFET ON-resistance:
    • RDS(ON)_HS = 53 mΩ (typ.)
    • RDS(ON)_LS = 31 mΩ (typ.)
  • 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, LM73606LM73605-Q1, or LM73606-Q1
  • Automotive distributed power applications (LM73605-Q1 and LM73606-Q1)
  • Battery-powered applications
  • Industrial distributed power applications
  • Telecommunications systems
  • General-purpose wide VIN regulation

LM73605/LM73606 Synchronous Step-Down Voltage Converters

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
LM73606RNPT datasheet linkIC REG BUCK ADJ 6A 30WQFNLM73606RNPTIC REG BUCK ADJ 6A 30WQFN150 - Immediate
LM73606RNPT product page link
LM73605RNPT datasheet linkIC REG BUCK ADJ 5A 30WQFNLM73605RNPTIC REG BUCK ADJ 5A 30WQFN0LM73605RNPT product page link

LM73605-Q1/LM73606-Q1 Synchronous Step-Down Voltage Converters

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
LM73605QRNPTQ1 datasheet linkIC REG BUCK ADJ 5A 30WQFNLM73605QRNPTQ1IC REG BUCK ADJ 5A 30WQFN1149 - Immediate
LM73605QRNPTQ1 product page link
LM73606QRNPTQ1 datasheet linkIC REG BUCK ADJ 6A 30WQFNLM73606QRNPTQ1IC REG BUCK ADJ 6A 30WQFN420 - Immediate
LM73606QRNPTQ1 product page link

Evaluation Modules

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
LM73605EVM-5V-2MHZ datasheet linkEVAL BOARD FOR LM73605LM73605EVM-5V-2MHZEVAL BOARD FOR LM7360510 - Immediate
56 - Factory Stock
LM73605EVM-5V-2MHZ product page link
LM73605EVM-5V-400K datasheet linkEVAL BOARD FOR LM73605LM73605EVM-5V-400KEVAL BOARD FOR LM7360510 - Immediate
41 - Factory Stock
LM73605EVM-5V-400K product page link
LM73606EVM-5V-400K datasheet linkEVAL BOARD FOR LM73606LM73606EVM-5V-400KEVAL BOARD FOR LM736066 - Immediate
84 - Factory Stock
LM73606EVM-5V-400K product page link
Published: 2017-12-05