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LM63635-Q1

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Automotive, 3.5V to 36V, 3.25A step-down voltage converter with spread spectrum

Product details

Rating Automotive Topology Buck Iout (max) (A) 3.25 Vin (max) (V) 32 Vin (min) (V) 3.5 Vout (max) (V) 20 Vout (min) (V) 1 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000024 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
Rating Automotive Topology Buck Iout (max) (A) 3.25 Vin (max) (V) 32 Vin (min) (V) 3.5 Vout (max) (V) 20 Vout (min) (V) 1 Features Enable, Fixed Output, Forced PWM, Frequency synchronization, Light Load Efficiency, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Spread Spectrum Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000024 Duty cycle (max) (%) 99 TI functional safety category Functional Safety-Capable
WSON (DRR) 12 9 mm² (3 mm × 3 mm) HTSSOP (PWP) 16 32 mm² (5 mm × 6.4 mm)
  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Supports automotive system requirements
    • Input voltage range: 3.5V to 36V
    • Short minimum on-time of 50ns
    • Good Electromagnetic Interference (EMI) performance
    • Psuedo-random spread spectrum
    • Compatible with CISPR 25
    • Low operating quiescent current of 23µA
    • Junction temperature range –40°C to +150°C
  • High design flexibility
    • Pin selectable VOUT: 3.3V, 5V, adjustable 1V to 20V
    • Output current: 3.25A
    • Pin selectable frequency: 400kHz, 2.1MHz, adjustable 250kHz to 2200kHz
    • Pin selectable FPWM, AUTO, sync modes
    • Pin compatible with: LM63610-Q1, LM63615-Q1, LM63625-Q1
    • TSSOP: Thermally-enhanced package
  • Small design size
    • As small as 14mm × 14mm for 3.25A, 2.2MHz with WSON package
    • Highly integrated design
    • Low component count
  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional Safety-Capable
  • Supports automotive system requirements
    • Input voltage range: 3.5V to 36V
    • Short minimum on-time of 50ns
    • Good Electromagnetic Interference (EMI) performance
    • Psuedo-random spread spectrum
    • Compatible with CISPR 25
    • Low operating quiescent current of 23µA
    • Junction temperature range –40°C to +150°C
  • High design flexibility
    • Pin selectable VOUT: 3.3V, 5V, adjustable 1V to 20V
    • Output current: 3.25A
    • Pin selectable frequency: 400kHz, 2.1MHz, adjustable 250kHz to 2200kHz
    • Pin selectable FPWM, AUTO, sync modes
    • Pin compatible with: LM63610-Q1, LM63615-Q1, LM63625-Q1
    • TSSOP: Thermally-enhanced package
  • Small design size
    • As small as 14mm × 14mm for 3.25A, 2.2MHz with WSON package
    • Highly integrated design
    • Low component count

The LM63635-Q1 regulator is an easy-to-use, synchronous, step-down DC/DC converter designed for rugged automotive applications. The LM63635-Q1 can drive up to 3.25A of load current from an input of up to 36V for WSON package and 32V for HTSSOP package. The converter has high light load efficiency and output accuracy in a small design size. Features such as a RESET flag and precision enable provide both flexible and easy-to-use designs for a wide range of applications. Automatic frequency foldback at light load improves efficiency while maintaining tight load regulation. Integration eliminates many external components and provides a pinout designed for simple PCB layout. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. The LM63635-Q1 is available in both the HTSSOP 16-pin power package, with PowerPAD™ integrated circuit package, and the WSON 12-pin power package.

The LM63635-Q1 regulator is an easy-to-use, synchronous, step-down DC/DC converter designed for rugged automotive applications. The LM63635-Q1 can drive up to 3.25A of load current from an input of up to 36V for WSON package and 32V for HTSSOP package. The converter has high light load efficiency and output accuracy in a small design size. Features such as a RESET flag and precision enable provide both flexible and easy-to-use designs for a wide range of applications. Automatic frequency foldback at light load improves efficiency while maintaining tight load regulation. Integration eliminates many external components and provides a pinout designed for simple PCB layout. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. The LM63635-Q1 is available in both the HTSSOP 16-pin power package, with PowerPAD™ integrated circuit package, and the WSON 12-pin power package.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM63635-Q1 3.5V to 36V, 3.25A, Automotive, Step-Down Voltage Converter datasheet (Rev. J) PDF | HTML Jun 8, 2026
Functional safety information LM636x5C-Q1 Functional Safety FIT Rate, FMD, and Pin FMA (Rev. B) PDF | HTML Jun 19, 2025
Functional safety information LM63635-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. C) PDF | HTML Mar 18, 2024
White paper Demystifying Input Supply Current in DC/DC Regulators:From Shutdown to Full Load (Rev. A) PDF | HTML Jun 6, 2023
Application note Design Consideration on Boot Resistor in Buck Converter PDF | HTML May 15, 2023
Application note Inverting Buck-Boost Application for the LM63615-Q1 PDF | HTML Mar 12, 2023
Application note Working with Inverting Buck-Boost Converters (Rev. B) PDF | HTML Oct 18, 2022
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr 8, 2021
Application note PCB Thermal Design Tips for Automotive DC/DC Converters PDF | HTML Nov 12, 2020
Certificate LM63635QDRREVM EU Declaration of Conformity (DoC) Sep 15, 2020
Functional safety information Streamlining Functional Safety Certification in Automotive and Industrial Jun 9, 2020

Design & development

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

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AWR2944PEVM — AWR2944PEVM evaluation module for the AWR2944P radar sensor

The AWR2944PEVM is evaluation board for the AWR2944P mmWave sensing device with direct connectivity to the DCA1000 EVM. This EVM kit contains everything needed to start developing software for the on-chip C66x DSP, ARM® Cortex®-R5F controller, and hardware accelerator (HWA 2.1). Also included is (...)
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Evaluation board

LM63625EVM — 3.5-V to 36-V, 2.5-A synchronous step-down converter evaluation module

The LM63625 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM63625 synchronous step-down converter.
User guide: PDF
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Evaluation board

LM63635DNEVM — LM63635DN evaluation module for 3.5-V to 36-V, 3.25-A step-down voltage converter with spread spectr

LM63635DNEVM evaluation module (EVM) helps designers evaluate the operation and performance of the LM636x5CAQDRRQ1 buck regulator. The LM636x5CAQDRRQ1 is a family of easy-to-use synchronous step-down DC/DC converters capable of driving up to 3.5-A of load current from an input voltage of 3.5-V to (...)
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Evaluation board

LM63635EVM — 3.5-A synchronous step-down converter evaluation module

The LM63635 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM63635 synchronous step-down converter.

User guide: PDF
Supported products & hardware
In stock
Limit:
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Evaluation board

LM63635QDRREVM — Evaluation module for 3.5-V to 36-V, 3.25-A step-down voltage converter with spread spectrum

The LM63635QDRREVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM63635-Q1 synchronous step-down converter.
User guide: PDF | HTML
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Simulation model

LM63635 PSpice Transient Model (Rev. A)

SLVMD19A.ZIP (308 KB) - PSpice model
Supported products & hardware
Calculation tool

SNVC239 — LM636x3Q Component Calculator

Supported products & hardware
Reference design

PMP21939 — Four-output synchronous buck reference design for automotive telematics control units

This reference design uses an LM63635-Q1 synchronous buck converter to output either a 3.3-V or 5-V rail. The bus converter switches at 2.1 MHz, and the load converters (TPS62810-Q1) switch at 2.2 MHz. The system is designed for telematics control unit power. Easily configurable jumpers allow (...)
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Reference design

PMP30670 — Automotive wide VIN front-end reference design for digital cockpit processing units

This reference design shows a power tree for automotive digital cockpit applications. The LM74700-Q1 provides low-loss reverse polarity protection to the system followed by an input filter. The LM5143-Q1 dual-synchronous buck converter provides a 3.3-V rail, which can support up to 15 A for a (...)

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Reference design

PMP30930 — EMI-optimized buck reference design

This reference design consists of three separable boards optimized for low EMI.

The three boards are labeled

  • PMP30930 Part A (using LM63635-Q1, PW package)
  • PMP30930 Part B (using LM63635-Q1, DR package)
  • PMP30930 Part C (Using LM61460-Q1)
Supported products & hardware
Reference design

TIPA-050053 — mmWave AWR2544 sensor power-supply design using the LP87725-Q1

This power supply design describes the optimized power IC (PMIC) to power the AWR2544 radar sensor. AWR2544LOPEVM showcases the typical connection between AWR2544LOP and LP87725-Q1 PMIC. LP87725-Q1 was optimized to meet the stringent power management requirements of the AWR2544LOP radar device.

Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
WSON (DRR) 12 Ultra Librarian
HTSSOP (PWP) 16 Ultra Librarian

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