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.

Features
  • 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
Applications
  • 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
LM73605RNPT datasheet linkIC REG BUCK ADJ 5A 30WQFNLM73605RNPTIC REG BUCK ADJ 5A 30WQFN0LM73605RNPT product page link
LM73606RNPT datasheet linkIC REG BUCK ADJ 6A 30WQFNLM73606RNPTIC REG BUCK ADJ 6A 30WQFN0LM73606RNPT 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 30WQFN1061 - Immediate
LM73605QRNPTQ1 product page link
LM73606QRNPTQ1 datasheet linkIC REG BUCK ADJ 6A 30WQFNLM73606QRNPTQ1IC REG BUCK ADJ 6A 30WQFN7 - 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
LM73605EVM-5V-2MHZ product page link
LM73605EVM-5V-400K datasheet linkEVAL BOARD FOR LM73605LM73605EVM-5V-400KEVAL BOARD FOR LM7360510 - Immediate
LM73605EVM-5V-400K product page link
LM73606EVM-5V-400K datasheet linkEVAL BOARD FOR LM73606LM73606EVM-5V-400KEVAL BOARD FOR LM736065 - Immediate
LM73606EVM-5V-400K product page link
Published: 2017-12-05