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Data sheet
A newer version of this product is available
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
- New product available: LM61460 60-V, 6-A synchronous converter
- Synchronous rectification
- Wettable flanks QFN package (WQFN)
- 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)
- 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
- Create a custom design with the WEBENCH® power designer using LM73605 or LM73606
The LM73605 and LM73606 family of devices are easy-to-use synchronous step-down DC/DC converters capable of driving up to 5 A or 6 A of load current from a supply voltage ranging from 3.5 V to 36 V. The LM73605 and LM73606 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 improves efficiency over the entire load range. Protection features include thermal shutdown, cycle-by-cycle current limiting, and short-circuit protection. The devices are pin-to-pin compatible for easy current scaling. The new product, LM61460-Q1, offers higher efficiency, lower stand-by quiescent current, and improved EMI performance. See the device comparison table to compare specifications. Start a Webench design with LM61460-Q1. Use the LMZM33606 module for faster time to market.
Technical documentation
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View all 9 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM73605/LM73606 3.5-V to 36-V, 5-A or 6-A Synchronous Step-Down Voltage Converter datasheet (Rev. A) | PDF | HTML | 21 Jul 2017 |
| Functional safety information | LM73605 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 | ||
| Technical article | How to add hysteresis to a DC/DC converter | PDF | HTML | 12 Nov 2018 | |
| Technical article | Effects of IC package on EMI performance | PDF | HTML | 22 May 2018 | |
| Technical article | Vary the output voltage in an inverting buck-boost topology | PDF | HTML | 12 Oct 2017 | |
| 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
Reference designs
TIDA-01458 — Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser
This reference design allows a digitally programmable power supply to power an ultrasound transmit circuit for continuous wave (CW) mode from a 24-V bus. There are two outputs adjustable from ±2.5 to ±12 V under user software control. These outputs can provide up to 2 A with very low (...)
Reference designs
TIDA-010011 — High efficiency power supply architecture reference design for protection relay processor module
This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RNP) | 30 | Ultra Librarian |
Ordering & quality
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