LM53635-Q1

ACTIVE

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

A newer version of this product is available

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Same functionality with different pin-out to the compared device
LM63635-Q1 ACTIVE 3.5-V to 32-V, 3.25-A step-down voltage converter with spread spectrum Available in wettable flank WSON package
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.

Product details

Rating Automotive Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 3.5 Vin (min) (V) 3.5 Vin (max) (V) 42 Switching frequency (min) (kHz) 1850 Switching frequency (max) (kHz) 2350 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package Control mode current mode Vout (min) (V) 3.2 Vout (max) (V) 10 Iq (typ) (µA) 18 Duty cycle (max) (%) 98
Rating Automotive Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 3.5 Vin (min) (V) 3.5 Vin (max) (V) 42 Switching frequency (min) (kHz) 1850 Switching frequency (max) (kHz) 2350 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package Control mode current mode Vout (min) (V) 3.2 Vout (max) (V) 10 Iq (typ) (µA) 18 Duty cycle (max) (%) 98
VQFN-HR (RNL) 22 20 mm² 5 x 4
  • 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.

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Technical documentation

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Type Title 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 29 Jul 2021
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
White paper Time-Saving and Cost-Effective Innovations for EMI Reduction (Rev. A) PDF | HTML 28 Nov 2023
Selection guide Automotive Infotainment EE Buck Converter/Controller Selection Guide (Rev. B) 15 Apr 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
White paper 透過節省時間和成本的創新技術 降低電源中的EMI 04 Dec 2020
White paper 전원 공급 장치의 EMI 절감을 위한 시간 및 비용 효율적 혁신 04 Dec 2020
Technical article Optimizing flip-chip IC thermal performance in automotive designs PDF | HTML 11 Dec 2019
Technical article How a DC/DC converter package and pinout design can enhance automotive EMI perform PDF | HTML 04 Sep 2018
Technical article A review of EMI standards, part 2 – radiated emissions PDF | HTML 05 Jul 2018
Technical article Effects of IC package on EMI performance PDF | HTML 22 May 2018
Application note Designing High Performance, Low-EMI, Automotive Power Supplies 30 Sep 2017
Technical article Discrete SBCs: versatile and scalable solutions for any application PDF | HTML 27 Jul 2017
Technical article Build a sub-20W CISPR25 Class 5 power design for automotive infotainment processor PDF | HTML 02 May 2017
Design guide Automotive Battery to Point-of-Load Power Solution for TDA2xx Design Guide (Rev. B) 31 Jan 2017
Technical article What to consider when designing an automotive power supply PDF | HTML 27 Jun 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
Not available on TI.com
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
Not available on TI.com
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
Not available on TI.com
Evaluation board

LM53635NQEVM — LM53635N-Q1 3.5A 3.3V Fixed Output Wide Vin Synchronous 2.1MHz Automotive Step-Down Converter EVM

This EVM demonstrates the capabilities of the LM53635N 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
Not available on TI.com
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
Not available on TI.com
Simulation model

LM536353-Q1 PSpice Transient Model

SNVMAN4.ZIP (116 KB) - PSpice Model
Simulation model

LM536353-Q1 Unencrypted PSpice Transient Model

SNVMAN3.ZIP (8 KB) - PSpice Model
Simulation model

LM536355-Q1 PSpice Transient Model

SNVMAN2.ZIP (118 KB) - PSpice Model
Simulation model

LM536355-Q1 Unencrypted PSpice Transient Model

SNVMAN1.ZIP (8 KB) - PSpice Model
Simulation model

LM53635A-Q1 PSpice Transient Model

SNVMAO0.ZIP (119 KB) - PSpice Model
Simulation model

LM53635A-Q1 Unencrypted PSpice Transient Model

SNVMAN9.ZIP (8 KB) - PSpice Model

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