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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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Product details

Parameters

Vin (Min) (V) 3.5 Vin (Max) (V) 32 Vout (Min) (V) 1 Vout (Max) (V) 20 Iout (Max) (A) 3.25 Iq (Typ) (mA) 0.024 Iq (Typ) (uA) 24 Switching frequency (Min) (kHz) 250 Switching frequency (Max) (kHz) 2200 Operating temperature range (C) -40 to 125, -40 to 150 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 16 32 mm² 5 x 6.4 WSON (DRR) 12 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)

Features

  • 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

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Description

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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM63635-Q1 3.5-V to 36-V, 3.25-A, Automotive Step-down Voltage Converter datasheet (Rev. C) Sep. 23, 2020
More literature LM63635QDRREVM EU Declaration of Conformity (DoC) Sep. 15, 2020
User guides LM63635DRREVM EVM User's Guide Jul. 24, 2020
White papers Streamlining Functional Safety Certification in Automotive and Industrial Jun. 09, 2020
White papers Streamlining Functional Safety Certification in Automotive and IndustrialN Jun. 09, 2020
White papers 자동차 및 산업 분야의 기능적 안전성 인증 간소화 Jun. 09, 2020
White papers Demystifying Input Supply Current in DC/DC Regulators:From Shutdown to Full Load May 18, 2020
Application notes Working with Inverting Buck-Boost Converters (Rev. A) May 14, 2020
Application notes LM63635-Q1 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) Apr. 21, 2020
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
49
Description
The LM63625 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM63625 synchronous step-down converter.
Features
  • Integrated synchronous rectification
  • Low operating quiescent current
  • High efficiency at light loads
  • Low minimum on-time
EVALUATION BOARDS Download
document-generic User guide
49
Description

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

Features
  • Integrated synchronous rectification
  • Low operating quiescent current
  • High efficiency at light loads
  • Low minimum on-time
EVALUATION BOARDS Download
document-generic User guide
49
Description
The LM63635QDRREVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM63635-Q1 synchronous step-down converter.
Features
  • Integrated synchronous rectification
  • Low operating quiescent current
  • High efficiency at light loads
  • Low minimum on-time

Software development

SUPPORT SOFTWARE Download
SNVC239A.ZIP (1622 KB)

Design tools & simulation

SIMULATION MODELS Download
SLVMD19.ZIP (99 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Four-output synchronous buck reference design for automotive telematics control units
PMP21939 — 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 users (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive wide VIN front-end reference design for digital cockpit processing units
PMP30670 — This reference design shows a complete 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 16 View options
SON (DRR) 12 View options

Ordering & quality

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