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LM63615-Q1

ACTIVE

3.5-V to 36-V, 1.5-A step-down voltage converter with spread spectrum

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Data sheet

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LMR43620-Q1 ACTIVE Automotive, 3-V to 36-V, 2-A low-EMI synchronous buck regulator with low IQ 1.5-uA Iq, 2-A current limit, 2-mm x2-mm QFN package

LM63615-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck Iout (max) (A) 1.5 Vin (max) (V) 36 Vin (min) (V) 3.5 Vout (max) (V) 24 Vout (min) (V) 1 Features Enable, Fixed Output, Fixed soft start, Forced PWM, Frequency synchronization, Light-load efficiency, Power good, Spread Spectrum, Synchronous rectification, UVLO fixed EMI features Spread Spectrum Control mode current mode Switching frequency (min) (kHz) 250 Switching frequency (max) (kHz) 2200 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 23 Duty cycle (max) (%) 99 Type Converter
Rating Automotive Topology Buck Iout (max) (A) 1.5 Vin (max) (V) 36 Vin (min) (V) 3.5 Vout (max) (V) 24 Vout (min) (V) 1 Features Enable, Fixed Output, Fixed soft start, Forced PWM, Frequency synchronization, Light-load efficiency, Power good, Spread Spectrum, Synchronous rectification, UVLO fixed EMI features Spread Spectrum Control mode current mode Switching frequency (min) (kHz) 250 Switching frequency (max) (kHz) 2200 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 23 Duty cycle (max) (%) 99 Type Converter
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: 3.5V to 36V
    • Short 50ns minimum on time
    • Good EMI performance Pseudo-random spread spectrum Compatible with CISPR 25
    • 23µA low operating quiescent current
    • –40°C to +150°C junction temperature range
  • High design flexibility
    • Pin selectable VOUT: 3.3V, 5V, adjustable 1V to 20V
    • Pin compatible with the LM63610 and LM63635 (1A, 3.25A)
    • Pin selectable frequency: 400kHz, 2.1MHz, adjustable 250kHz to 2200kHz
    • Pin selectable FPWM, auto, sync modes
    • TSSOP: thermally enhanced package
    • WSON: for space-constrained applications
  • Small design size
    • As small as 10mm × 10mm for 2.5A, 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 50ns minimum on time
    • Good EMI performance Pseudo-random spread spectrum Compatible with CISPR 25
    • 23µA low operating quiescent current
    • –40°C to +150°C junction temperature range
  • High design flexibility
    • Pin selectable VOUT: 3.3V, 5V, adjustable 1V to 20V
    • Pin compatible with the LM63610 and LM63635 (1A, 3.25A)
    • Pin selectable frequency: 400kHz, 2.1MHz, adjustable 250kHz to 2200kHz
    • Pin selectable FPWM, auto, sync modes
    • TSSOP: thermally enhanced package
    • WSON: for space-constrained applications
  • Small design size
    • As small as 10mm × 10mm for 2.5A, 2.2MHz with WSON package
    • Highly integrated design
    • Low component count

The LM636x5-Q1 is an easy-to-use, synchronous, step-down DC/DC converter designed for rugged automotive applications. The LM636x5-Q1 can drive up to 1.5A or 2.5A of load current from an input of up to 36V. 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 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 LM636x5-Q1 is available in the HTSSOP 16-pin power package, with PowerPAD™ integrated circuit packageand the WSON 12-pin power package.

The LM636x5-Q1 is an easy-to-use, synchronous, step-down DC/DC converter designed for rugged automotive applications. The LM636x5-Q1 can drive up to 1.5A or 2.5A of load current from an input of up to 36V. 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 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 LM636x5-Q1 is available in the HTSSOP 16-pin power package, with PowerPAD™ integrated circuit packageand the WSON 12-pin power package.
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Technical documentation

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Type Title Date
* Data sheet LM636x5-Q1 3.5V to 36V, 1.5A and 2.5A, Automotive, Step-Down Voltage Converter datasheet (Rev. I) 16 May 2025
Application note Precautions for LM636XX-Q1: Regarding a Failure Analysis in PFM Mode PDF | HTML 23 Jan 2026
Functional safety information LM636x5C-Q1 Functional Safety FIT Rate, FMD, and Pin FMA (Rev. B) PDF | HTML 19 Jun 2025
Functional safety information LM636xx-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. E) PDF | HTML 18 Mar 2024
White paper Demystifying Input Supply Current in DC/DC Regulators:From Shutdown to Full Load (Rev. A) 06 Jun 2023
Application note Inverting Buck-Boost Application for the LM63615-Q1 PDF | HTML 12 Mar 2023
Application note Working with Inverting Buck-Boost Converters (Rev. B) PDF | HTML 18 Oct 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
Certificate LM63615QDRREVM EU Declaration of Conformity (DoC) (Rev. A) 15 Sep 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

Design & development

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

Evaluation board

LM63615QDRREVM — Evaluation module for 3.5-V to 36-V, 1.5-A step-down voltage converter with spread spectrum

The LM63615QDRREVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM63625-Q1 synchronous step-down converter.
User guide: PDF | HTML
Not available on TI.com
Simulation model

LM63615-Q1 PSpice Transient Model

SNVMBR6.ZIP (102 KB) - PSpice Model
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Calculation tool

SNVC239 — LM636x3Q Component Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
  • LM63610-Q1 — 3.5-V to 36-V, 1.0-A step-down voltage converter with spread spectrum
  • LM63615-Q1 — 3.5-V to 36-V, 1.5-A step-down voltage converter with spread spectrum
  • LM63625-Q1 — 3.5-V to 36-V, 2.5-A step-down voltage converter with spread spectrum
  • LM63635-Q1 — Automotive, 3.5V to 36V, 3.25A step-down voltage converter with spread spectrum
Download
Reference designs

PMP22063 — Automotive cluster and display power reference design with warm/cold-crank capability

This reference design provides the system rails for automotive HUD, center information display, cluster display, or other automotive displays. A 3.3-V bus is generated by an off-battery buck converter. A boost converter provides 3.3-V to 5-V conversion and a buck provides 1.8 V from the 3.3-V (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP22030 — Efficient, low-heat, CISPR 25 class 5-compliant power reference design for infotainment display

This reference design is focused on the power tree for an automotive infotainment display unit covering various power supply rails including two off-battery converters providing 5.0-V and 3.3-V, and intermediary system rails of 1.8-V and 1.1-V. The test results demonstrate high efficiency, low (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 16 Ultra Librarian
WSON (DRR) 12 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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