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Conv DC-DC 3.5V to 42V Synchronous Step Down Single-Out 5V 3.5A Automotive 22-Pin VQFN-HR T/R

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LMS3635LQRNLRQ1 General Description

The LMS3635-Q1 and LMS3655-Q1 synchronous buck regulators are optimized for high performance applications, providing an output voltage of 3.3 V, 5 V, or an adjustable output of 1 V to 20 V. Seamless transition between PWM and PFM modes, along with a low quiescent current, ensures high efficiency and superior transient responses at all loads.

Advanced high-speed circuitry allows the LMS3655-Q1 to regulate an input of 24 V to an output of 3.3 V at a fixed frequency of 400 kHz while also enabling a continuous load current of 5.5 A. An innovative frequency foldback architecture allows this device to regulate a 3.3-V output from an input voltage of only 3.5 V. The input voltage can range up to 36 V, with transient tolerance up to 42 V, easing input surge protection design.

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.

Texas Instruments, Inc Inventory

Key Features

  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
    • Device HBM classification level 2
    • Device CDM classification level C6
  • 96% Peak efficiency while converting 12 V to 5 V
  • Low EMI and minimized switch node ringing
  • 400-kHz (±10%) fixed switching frequency
  • –40°C to +150°C junction temperature range
  • External frequency synchronization
  • RESET output with internal filter and 3-ms release timer
  • Automatic light load mode for improved efficiency
  • Pin-selectable forced PWM mode
  • Built-In compensation, soft start, current limit, thermal shutdown, and UVLO
  • 0.35-V dropout with 3.5-A Load at 25°C (Typical)
  • 18-μA IQ_VIN: quiescent current at 3.3 VOUT and no load (typical)
  • Output voltage: 5 V, 3.3 V, and ADJ (1 V to 20 V)
  • ±1.5% reference voltage tolerance
  • Create a custom design using the LMS3655-Q1 with the WEBENCH Power Designer
Texas Instruments, Inc Original Stock
Texas Instruments, Inc Inventory


Category Integrated Circuits (ICs)Power Management (PMIC)Voltage Regulators - DC DC Switching Regulators Mfr Texas Instruments
Series Automotive, AEC-Q100 Package Tape & Reel (TR)
Product Status Active Function Step-Down
Output Configuration Positive Topology Buck
Output Type Fixed Number of Outputs 1
Voltage - Input (Min) 3.9V Voltage - Input (Max) 36V
Voltage - Output (Min/Fixed) 5V Voltage - Output (Max) -
Current - Output 3.5A Frequency - Switching 250kHz ~ 500kHz
Synchronous Rectifier No Operating Temperature -40°C ~ 125°C (TA)
Mounting Type Surface Mount, Wettable Flank Package / Case 22-VFQFN
Supplier Device Package 22-VQFN-HR (5x4)


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Our products are mainly transported and delivered by DHL, FedEx, UPS and other logistics partners on site -- Available to 200+ countries.

Delivery Time

The delivery time is usually within 2-7 days, depending on the logistics provider and the area of delivery.

The following are the estimated delivery times of some logistics service providers.

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We accept TT prepayment (bank transfer), paypal, credit cards, Western Union, Money Gram.

Checks and other instruments are not supported to pay for orders and customers are required to pay all possible fees, including sales tax,
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Our policies and procedures are designed to ensure compliance with various quality specifications and to quickly resolve quality-related issues.

We promise to provide 365 days quality assurance service for all our products.

If you have any dissatisfaction with the quality of the product you received, you can contact us for a refund or exchange, as long as the product is kept in its original condition.


AVAQ determines and packages all devices based on electrostatic discharge (ESD) and moisture sensitivity level (MSL) protection requirements.
  • ESD


  • Tape and Reel

    Tape and Reel

  • Cut Tape

    Cut Tape

  • Tube or Tray

    Tube or Tray


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LMS3635LQRNLRQ1 Datasheet PDF

Preliminary Specification LMS3635LQRNLRQ1 PDF Download


Buying Guide

  • What is the lifespan of LMS3635LQRNLRQ1?

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