Calculation tool
Data sheet
LMR33640
- Functional Safety-Capable
- Configured for rugged industrial applications
- Input voltage range: 3.8 V to 36 V
- Output voltage range: 1 V to 24 V
- Peak-current mode control
- Junction temperature range: –40°C to +125°C
- Ease-of-use SOIC package
- Well-suited for scalable industrial power supplies
- High-efficiency solution
- Peak efficiency > 95%
- Low shutdown quiescent current of 5 µA
- Low operating quiescent current of 24 µA
- Flexible system interface
- Power-good flag and precision enable
- Create a custom design using the LMR33640 with the WEBENCH Power Designer
- Use TPSM53604 module for faster time to market
The LMR33640 SIMPLE SWITCHER regulator is an easy-to-use, synchronous, step-down DC/DC converter that delivers best-in-class efficiency for rugged industrial applications. The LMR33640 drives up to 4 A of load current from an input of up to 36 V. The LMR33640 provides high light-load efficiency and output accuracy. Features such as a power-good flag and precision enable provide both flexible and easy-to-use solutions for a wide range of applications. The LMR33640 automatically folds back frequency at light load to improve efficiency. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. Integration and internal compensation eliminates many external components and provides a pinout designed for a simple PCB layout. The feature set of the device is designed to simplify implementation for a wide range of end equipment. The LMR33640 is pin-to-pin compatible with the LMR33610, LMR33620, LMR33630 (36 V, 1 A/2, A/3 A), LMR36510 (65 V, 1 A), and LMR36520 (65 V, 2 A), completing the family of scalable SIMPLE SWITCHER power supplies. This minimizes the cost and effort associated with board layout modifications. The LMR33640 is available in an 8-pin HSOIC package.
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Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LMR33640 SIMPLE SWITCHER 3.8-V to 36-V, 4-A Synchronous Step-down Converter datasheet (Rev. C) | PDF | HTML | 24 Nov 2020 |
| Functional safety information | LMR336x0 Functional Safety, FIT Rate, FMD and Pin FMA (Rev. B) | PDF | HTML | 20 Mar 2024 | |
| Application note | Working with Inverting Buck-Boost Converters (Rev. B) | PDF | HTML | 18 Oct 2022 | |
| Technical article | 3 tips when designing a power stage for servo and AC drives | PDF | HTML | 20 Nov 2019 | |
| EVM User's guide | LMR33640EVM User's Guide | 01 Nov 2019 | ||
| Technical article | How to increase system reliability and simplify design using DC/DC converters | PDF | HTML | 13 Jun 2016 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LMR33640EVM — 3.8-V to 36-V, 4-A step-down converter evaluation module
The LMR33640 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR33640ADDA synchronous step-down converer.
User guide: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HSOIC (DDA) | 8 | Ultra Librarian |
Ordering & quality
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- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
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- Ongoing reliability monitoring
Information included:
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Support & training
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