Home Power management DC/DC switching regulators DC/DC converters
Home
Power management
DC/DC switching regulators
DC/DC converters

LM53635-Q1

ACTIVE

3.5-A, 36-V synchronous, 2.1-MHz, automotive step-down DC-DC converter

Order now
Data sheet

A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device.
LMQ62440-Q1 ACTIVE Automotive 3-V to 36-V, 4-A, low-noise fixed frequency synchronous step-down converter Smaller footprint, lower EMI with dual-random spread spectrum and lower IQ.
LM63635-Q1 ACTIVE Automotive, 3.5V to 36V, 3.25A step-down voltage converter with spread spectrum Available in wettable flank WSON package

LM53635-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck Iout (max) (A) 3.5 Vin (max) (V) 42 Vin (min) (V) 3.5 Vout (max) (V) 10 Vout (min) (V) 3.2 Features Enable, Fixed Output, Fixed soft start, Forced PWM, Frequency synchronization, Light-load efficiency, Overcurrent protection, Power good, Prebias startup, Spread Spectrum, Synchronous rectification, Wettable flanks package EMI & noise features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000018 Duty cycle (max) (%) 98
Rating Automotive Topology Buck Iout (max) (A) 3.5 Vin (max) (V) 42 Vin (min) (V) 3.5 Vout (max) (V) 10 Vout (min) (V) 3.2 Features Enable, Fixed Output, Fixed soft start, Forced PWM, Frequency synchronization, Light-load efficiency, Overcurrent protection, Power good, Prebias startup, Spread Spectrum, Synchronous rectification, Wettable flanks package EMI & noise features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000018 Duty cycle (max) (%) 98
VQFN-HR (RNL) 22 20 mm² (5 mm × 4 mm)
  • AEC-Q100 automotive qualified:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM classification level 2
    • Device CDM classification level C6
  • –40°C to +150°C junction temperature range
  • 15-µA quiescent urrent at no load (typical) with 3.3-V output
  • 5.0-mm × 4.0-mm VQFN package with or without wettable flanks and 0.6-mm VIN spacing
  • Low EMI and switch noise
  • Spread spectrum option
  • External frequency synchronization
  • RESET output with internal filter and 3-ms release timer
  • Pin-selectable forced PWM mode
  • Built-in compensation, soft start, current limit, thermal shutdown, and UVLO
  • 0.6-V dropout at 3.5 A at 105°C TA
  • ±1% output voltage tolerance (–40°C to 125°C TJ)
  • Available with fixed 5-V, 3.3-V or adjustable output
  • AEC-Q100 automotive qualified:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM classification level 2
    • Device CDM classification level C6
  • –40°C to +150°C junction temperature range
  • 15-µA quiescent urrent at no load (typical) with 3.3-V output
  • 5.0-mm × 4.0-mm VQFN package with or without wettable flanks and 0.6-mm VIN spacing
  • Low EMI and switch noise
  • Spread spectrum option
  • External frequency synchronization
  • RESET output with internal filter and 3-ms release timer
  • Pin-selectable forced PWM mode
  • Built-in compensation, soft start, current limit, thermal shutdown, and UVLO
  • 0.6-V dropout at 3.5 A at 105°C TA
  • ±1% output voltage tolerance (–40°C to 125°C TJ)
  • Available with fixed 5-V, 3.3-V or adjustable output

The LM53625-Q1/LM53635-Q1 synchronous buck regulator is optimized for automotive applications, providing an output voltage of 5 V, 3.3 V, or an adjustable output. Advanced high-speed circuitry allows the LM53625-Q1/LM53635-Q1 to regulate from an input of 18 V to an output of 3.3 V at a fixed frequency of 2.1 MHz. Innovative architecture allows this device to regulate a 3.3-V output from an input voltage of only 3.55 V. All aspects of the LM53625-Q1/LM53635-Q1 are optimized for automotive and performance-driven industrial customers. An input voltage range up to 36 V, with transient tolerance up to 42 V, eases input surge protection design. The automotive-qualified Hotrod QFN package with wettable flanks reduces parasitic inductance and resistance while increasing efficiency, minimizing switch node ringing, and dramatically lowering electromagnetic interference (EMI). An open-drain reset output, with built-in filtering and delay, provides a true indication of system status. This feature negates the requirement for an additional supervisory component, saving cost and board space. Seamless transition between PWM and PFM modes and low quiescent current (only 15 µA for the 3.3 V option) ensure high efficiency and superior transient responses at all loads.

The LM53625-Q1/LM53635-Q1 synchronous buck regulator is optimized for automotive applications, providing an output voltage of 5 V, 3.3 V, or an adjustable output. Advanced high-speed circuitry allows the LM53625-Q1/LM53635-Q1 to regulate from an input of 18 V to an output of 3.3 V at a fixed frequency of 2.1 MHz. Innovative architecture allows this device to regulate a 3.3-V output from an input voltage of only 3.55 V. All aspects of the LM53625-Q1/LM53635-Q1 are optimized for automotive and performance-driven industrial customers. An input voltage range up to 36 V, with transient tolerance up to 42 V, eases input surge protection design. The automotive-qualified Hotrod QFN package with wettable flanks reduces parasitic inductance and resistance while increasing efficiency, minimizing switch node ringing, and dramatically lowering electromagnetic interference (EMI). An open-drain reset output, with built-in filtering and delay, provides a true indication of system status. This feature negates the requirement for an additional supervisory component, saving cost and board space. Seamless transition between PWM and PFM modes and low quiescent current (only 15 µA for the 3.3 V option) ensure high efficiency and superior transient responses at all loads.
filter Find other DC/DC converters
Download View video with transcript Video

Technical documentation

No results found. Please clear your search and try again.
View all 13
Top documentation Type Title Format options Date
* Data sheet LM53625/35-Q1, 2.5-A or 3.5-A, 36-V Synchronous, 2.1-MHz, Step-Down DC-DC Converter datasheet (Rev. B) PDF | HTML Jul 29, 2021
White paper Time-Saving and Cost-Effective Innovations for EMI Reduction (Rev. A) PDF | HTML Nov 28, 2023
Selection guide Automotive Infotainment EE Buck Converter/Controller Selection Guide (Rev. B) Apr 15, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr 8, 2021
Technical article Optimizing flip-chip IC thermal performance in automotive designs PDF | HTML Dec 11, 2019
Technical article How a DC/DC converter package and pinout design can enhance automotive EMI perform PDF | HTML Sep 4, 2018
Technical article A review of EMI standards, part 2 – radiated emissions PDF | HTML Jul 5, 2018
Technical article Effects of IC package on EMI performance PDF | HTML May 22, 2018
Application note Designing High Performance, Low-EMI, Automotive Power Supplies Sep 30, 2017
Technical article Discrete SBCs: versatile and scalable solutions for any application PDF | HTML Jul 27, 2017
Technical article Build a sub-20W CISPR25 Class 5 power design for automotive infotainment processor PDF | HTML May 2, 2017
Design guide Automotive Battery to Point-of-Load Power Solution for TDA2xx Design Guide (Rev. B) Jan 31, 2017
Technical article What to consider when designing an automotive power supply PDF | HTML Jun 27, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM53635AQEVM — LM53635A-Q1 3.5A 5.0V Adjustable Output Wide Vin Synchronous 2.1MHz Automotive Step-Down Converter

This EVM demonstrates the capabilities of the LM53635A automotive integrated buck converter. The EVM has an EMI filter on the back side that assists with noise reduction. The user can choose to bypass that EMI filter using  VIN1/GND1 posts . The EVM operates from an 3.5V to 36V input (up to (...)
User guide: PDF
Supported products & hardware
In stock
Limit:
??asset.out-of-stock-ti_en_US??
Not available
Evaluation board

LM53635LQEVM — LM53635L-Q1 3.5A 5.0V Fixed Output Wide Vin Synchronous 2.1MHz Automotive Step-Down Converter EVM

This EVM demonstrates the capabilities of the LM53635L automotive integrated buck converter. The EVM has an EMI filter on the back side that assists with noise reduction and Spread Spectrum build in. The user can choose to bypass that EMI filter using  VIN1/GND1 posts . The EVM operates from (...)
User guide: PDF
Supported products & hardware
In stock
Limit:
??asset.out-of-stock-ti_en_US??
Not available
Evaluation board

LM53635MQEVM — LM53635M-Q1 3.5A 5.0V Adjustable Output 2.1MHz Automotive Step-Down Converter With Spread Spectrum

This EVM demonstrates the capabilities of the LM53635M automotive integrated buck converter. The EVM has an EMI filter on the back side that assists with noise reduction and Spread Spectrum build in. The user can choose to bypass that EMI filter using  VIN1/GND1 posts . The EVM operates from (...)
User guide: PDF
Supported products & hardware
In stock
Limit:
??asset.out-of-stock-ti_en_US??
Not available
Evaluation board

MMWAVEICBOOST — mmWave sensors carrier card platform

The MMWAVEICBOOST carrier card expands capabilities of select 60 GHz mmWave evaluation modules. This board provides advanced software developement, debug features such as trace and single step via TI’s Code Composers compatible debuggers. On-board Launchpad interface enables pairing with (...)

User guide: PDF | HTML
Supported products & hardware
In stock
Limit:
??asset.out-of-stock-ti_en_US??
Not available
Simulation model

LM536353-Q1 PSpice Transient Model

SNVMAN4.ZIP (116 KB) - PSpice model
Supported products & hardware
Simulation model

LM536353-Q1 Unencrypted PSpice Transient Model

SNVMAN3.ZIP (8 KB) - PSpice model
Supported products & hardware
Simulation model

LM536355-Q1 PSpice Transient Model

SNVMAN2.ZIP (118 KB) - PSpice model
Supported products & hardware
Simulation model

LM536355-Q1 Unencrypted PSpice Transient Model

SNVMAN1.ZIP (8 KB) - PSpice model
Supported products & hardware
Simulation model

LM53635A-Q1 PSpice Transient Model

SNVMAO0.ZIP (119 KB) - PSpice model
Supported products & hardware
Simulation model

LM53635A-Q1 Unencrypted PSpice Transient Model

SNVMAN9.ZIP (8 KB) - PSpice model
Supported products & hardware

Many TI reference designs include the LM53635-Q1

Use our reference design selection tool to review and identify designs that best match your application and parameters.
Package Pins CAD symbols, footprints & 3D models
VQFN-HR (RNL) 22 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos