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LM73605-Q1
Automotive qualified 3.5-V to 36-V, 5-A synchronous step-down voltage converter
Data sheet
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This product continues to be available for existing customers. New designs should consider an alternate product.
Same functionality with different pin-out to the compared device
LM73605-Q1
- AEC-Q100-qualified for automotive applications
- Device temperature grade 1: –40°C to +125°C ambient operating temperature
- Device HBM ESD classification level 2 kV
- Device CDM ESD classification level C5
- Wettable flanks QFN package (WQFN)
- Low EMI and low switching noise
- 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)
- Adjustable frequency range: 350 kHz to 2.2 MHz
- Pin-selectable auto mode or forced PWM mode
- Start-up into pre-biased load, fixed or adjustable soft-start time, and tracking
- Synchronizable to external clock, internal compensation, power-good flag, and precision enable
- Cycle-by-cycle current limiting, hiccup, UVLO, and thermal shutdown protections
- Create a custom design with the WEBENCH power designer using LM73605-Q1 or LM73606-Q1
The LM73605-Q1/LM73606-Q1family of devices are easy-to-use synchronous step-down DC/DC converters capable of driving up to 5 A (LM73605-Q1)or 6 A (LM73606-Q1) of load current from a supply voltage ranging from 3.5 V to 36 V. The LM73605-Q1/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, 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 lookout, cycle-cy-cycle current limiting, and hiccup short-citcuit protection. The LM73605-Q1 and LM73606-Q1 devices are pin-to-pin compatible for easy current scaling.
Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM7360x-Q1 3.5-V to 36-V, 5-A or 6-A Synchronous Step-Down Voltage Converter datasheet (Rev. B) | PDF | HTML | 14 May 2021 |
| Functional safety information | LM73605-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 12 Jul 2022 | |
| Application note | Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) | PDF | HTML | 26 Jul 2021 | |
| Selection guide | Buck Converter Quick Reference Guide (Rev. B) | 08 Apr 2021 | ||
| Application note | Designing High Performance, Low-EMI, Automotive Power Supplies | 30 Sep 2017 | ||
| EVM User's guide | LM73605/LM73606 EVM User's Guide | 20 Sep 2017 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM73605EVM-5V-2MHZ — LM73605 Synchronous Step-Down Converter Evaluation Module
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 6V to 36V input and provides a 5V output voltage with 5A maximum load current.
User guide: PDF
Evaluation board
LM73605EVM-5V-400K — LM73605 Synchronous Step-Down Converter Evaluation Module
The LM73605EVM-5V-400K evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM73605 synchronous step-down voltage converter. The EVM operates from 6V to 36V input and provides a 5V output voltage with 5A maximum load current.
User guide: PDF
Simulation model
LM73605 Inverting and non-inverting PSpice Transient Model
SNVMBD7.ZIP (955 KB) - PSpice Model
Simulation model
LM73605 TINA-TI Transient Reference Design
SNVMBE0.TSC (2316 KB) - TINA-TI Reference Design
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RNP) | 30 | Ultra Librarian |
Ordering & quality
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