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Buck converters (integrated switch)

LM63635-Q1

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3.5-V to 32-V, 3.25-A step-down voltage converter with spread spectrum

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Data sheet

LM63635-Q1

ACTIVE
Data sheet Order now

Product details

Vin (Min) (V) 3.5 Vin (Max) (V) 32 Vout (Min) (V) 1 Vout (Max) (V) 20 Iout (Max) (A) 3.25 Iq (Typ) (uA) 24 Switching frequency (Min) (kHz) 250 Switching frequency (Max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency Synchronization, Light Load Efficiency, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed Rating Automotive Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 99
Vin (Min) (V) 3.5 Vin (Max) (V) 32 Vout (Min) (V) 1 Vout (Max) (V) 20 Iout (Max) (A) 3.25 Iq (Typ) (uA) 24 Switching frequency (Min) (kHz) 250 Switching frequency (Max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency Synchronization, Light Load Efficiency, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, UVLO Fixed Rating Automotive Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 99
HTSSOP (PWP) 16 32 mm² 5 x 6.4 WSON (DRR) 12 9 mm² 3 x 3
  • 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: 3.5 V to 36 V
    • Short minimum on-time of 50 ns
    • Good EMI performance
    • Psuedo-random spread spectrum
    • Compatible with CISPR 25
    • Low operating quiescent current of 23 µA
    • Junction temperature range –40°C to +150°C
  • High design flexibility
    • Pin selectable VOUT: 3.3 V, 5 V, adjustable 1 V to 20 V
    • Output current: 3.25 A
    • Pin selectable frequency: 400 kHz, 2.1 MHz, adjustable 250 kHz to 2200 kHz
    • Pin selectable FPWM, AUTO, sync modes
    • Pin compatible with: LM63610-Q1/ LM63615-Q1/ LM63625-Q1
    • TSSOP: Thermally-enhanced package
  • Small solution size
    • As small as: 14 mm × 14 mm for 3.25 A, 2.2 MHz with WSON package
    • Highly integrated solution
    • 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: 3.5 V to 36 V
    • Short minimum on-time of 50 ns
    • Good EMI performance
    • Psuedo-random spread spectrum
    • Compatible with CISPR 25
    • Low operating quiescent current of 23 µA
    • Junction temperature range –40°C to +150°C
  • High design flexibility
    • Pin selectable VOUT: 3.3 V, 5 V, adjustable 1 V to 20 V
    • Output current: 3.25 A
    • Pin selectable frequency: 400 kHz, 2.1 MHz, adjustable 250 kHz to 2200 kHz
    • Pin selectable FPWM, AUTO, sync modes
    • Pin compatible with: LM63610-Q1/ LM63615-Q1/ LM63625-Q1
    • TSSOP: Thermally-enhanced package
  • Small solution size
    • As small as: 14 mm × 14 mm for 3.25 A, 2.2 MHz with WSON package
    • Highly integrated solution
    • 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 3.25-A of load current from an input of up to 36 V for WSON package and 32 V for HTSSOP package. The converter has high light load efficiency and output accuracy in a small solution size. Features such as a RESET flag and precision enable provide both flexible and easy-to-use solutions 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™, 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 3.25-A of load current from an input of up to 36 V for WSON package and 32 V for HTSSOP package. The converter has high light load efficiency and output accuracy in a small solution size. Features such as a RESET flag and precision enable provide both flexible and easy-to-use solutions 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™, and the WSON 12-pin power package.
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Technical documentation

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Type Title Date
* Data sheet LM63635-Q1 3.5-V to 36-V, 3.25-A, Automotive Step-down Voltage Converter datasheet (Rev. D) PDF | HTML 02 Sep 2022
Functional safety information LM636x5-Q1 Functional Safety FIT Rate, FMD, and Pin FMA PDF | HTML 22 Jun 2022
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Application note PCB Thermal Design Tips for Automotive DC/DC Converters PDF | HTML 12 Nov 2020
Functional safety information LM63635-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. B) PDF | HTML 21 Oct 2020
Certificate LM63635QDRREVM EU Declaration of Conformity (DoC) 15 Sep 2020
EVM User's guide LM63635DRREVM EVM User's Guide PDF | HTML 24 Jul 2020
Functional safety information Streamlining Functional Safety Certification in Automotive and Industrial 09 Jun 2020
White paper 簡化汽車及工業領域的功 能安全認證 09 Jun 2020
White paper 자동차 및 산업 분야의 기능적 안전성 인증 간소화 09 Jun 2020
White paper Demystifying Input Supply Current in DC/DC Regulators:From Shutdown to Full Load 18 May 2020
Application note Working with Inverting Buck-Boost Converters (Rev. A) 14 May 2020
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019

Design & development

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

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User guide: PDF
Not available on TI.com
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
Not available on TI.com
Evaluation board

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

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 (...)
User guide: PDF | HTML
Not available on TI.com
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
Not available on TI.com
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
Not available on TI.com
Support software

LM636x3Q Component Calculator (Rev. A)

SNVC239A.ZIP (1622 KB)
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Simulation model

LM63635 PSpice Transient Model (Rev. A)

SLVMD19A.ZIP (308 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

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)
Reference designs

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 (...)
Schematic: PDF
Reference designs

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 (...)
Schematic: PDF
Package Pins Download
HTSSOP (PWP) 16 View options
WSON (DRR) 12 View options

Ordering & quality

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  • Ongoing reliability monitoring

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