LM53635-Q1

ACTIVE

2.5/3.5A, 36 V Synchronous, 2.1MHz, Automotive Step Down DC-DC Converter

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Product details

Parameters

Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 3.2 Vout (Max) (V) 10 Iout (Max) (A) 3.5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 1850 Switching frequency (Max) (kHz) 2350 Features Enable, Fixed Output, Forced PWM, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable Flanks Package Control mode Current Mode Duty cycle (Max) (%) 98 Type Converter Operating temperature range (C) -40 to 150 Rating Automotive open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN-HR (RNL) 22 20 mm² 4 x 5 open-in-new Find other Buck converters (integrated switch)

Features

  • AEC-Q100 Automotive Qualified:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
    • Device HBM Classification Level 2
    • Device CDM Classification Level C6
  • –40°C to +150°C Junction Temperature Range
  • 15-µA Quiescent Current at no Load (Typical) with 3.3-V Output
  • 4 mm × 5 mm, 0.5-mm Pitch VQFN Package With Wettable Flanks and 0.6-mm VIN Spacing
  • Low EMI and Switch Noise
  • Spread Spectrum Option
  • External Frequency Synchronization
  • RESET Output with Internal Filter and 3-ms Release Timer
  • Pin-Selectable Forced PWM Mode
  • Built-In Compensation, Soft Start, Current Limit, Thermal Shutdown, and UVLO
  • 0.6-V Dropout at 3.5 A at 105°C TA
  • ±1% Output Voltage Tolerance (–40°C to 125°C TJ)
  • Available With Fixed 5-V, 3.3-V or Adjustable Output

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Description

The LM53625-Q1/LM53635-Q1 synchronous buck regulator is optimized for automotive applications, providing an output voltage of 5 V, 3.3 V, or an adjustable output. Advanced high-speed circuitry allows the LM53625-Q1/LM53635-Q1 to regulate from an input of 18 V to an output of 3.3 V at a fixed frequency of 2.1 MHz. Innovative architecture allows this device to regulate a 3.3-V output from an input voltage of only 3.55 V. All aspects of the LM53625-Q1/LM53635-Q1 are optimized for automotive and performance-driven industrial customers. An input voltage range up to 36 V, with transient tolerance up to 42 V, eases input surge protection design. The automotive-qualified Hotrod QFN package with wettable flanks reduces parasitic inductance and resistance while increasing efficiency, minimizing switch node ringing, and dramatically lowering electromagnetic interference (EMI). 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. Seamless transition between PWM and PFM modes and low quiescent current (only 15 µA for the 3.3 V option) ensure high efficiency and superior transient responses at all loads.

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Technical documentation

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
$49.00
Description
This EVM demonstrates the capabilities of the LM53635A automotive integrated buck converter. The EVM has an EMI filter on the back side that assists with noise reduction. The user can choose to bypass that EMI filter using  VIN1/GND1 posts . The EVM operates from an 3.5V to 36V input (up to 42V (...)
Features
  • High Efficiency with 2.1MHz and Auto Light Mode PFM/PWM or Forced PWM Mode operation
  • /RESET Power Good output with 3ms delay on timer
  • External Frequency Synchronisation Input
  • Low EMI
  • Fully Synchronous with integrated HS and LS FET
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
This EVM demonstrates the capabilities of the LM53635L automotive integrated buck converter. The EVM has an EMI filter on the back side that assists with noise reduction and Spread Spectrum build in. The user can choose to bypass that EMI filter using  VIN1/GND1 posts . The EVM operates from an (...)
Features
  • High Efficiency with 2.1MHz and Auto Light Mode PFM/PWM or Forced PWM Mode operation
  • /RESET Power Good output with 3ms delay on timer
  • External Frequency Synchronisation Input
  • Low EMI
  • Fully Synchronous with integrated HS and LS FET
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
This EVM demonstrates the capabilities of the LM53635M automotive integrated buck converter. The EVM has an EMI filter on the back side that assists with noise reduction and Spread Spectrum build in. The user can choose to bypass that EMI filter using  VIN1/GND1 posts . The EVM operates from an (...)
Features
  • High Efficiency with 2.1MHz and Auto Light Mode PFM/PWM or Forced PWM Mode operation
  • /RESET Power Good output with 3ms delay on timer
  • External Frequency Synchronisation Input
  • Low EMI
  • Fully Synchronous with integrated HS and LS FET
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
This EVM demonstrates the capabilities of the LM53635N automotive integrated buck converter. The EVM has an EMI filter on the back side that assists with noise reduction and Spread Spectrum build in. The user can choose to bypass that EMI filter using  VIN1/GND1 posts . The EVM operates from an (...)
Features
  • High Efficiency with 2.1MHz and Auto Light Mode PFM/PWM or Forced PWM Mode operation
  • /RESET Power Good output with 3ms delay on timer
  • External Frequency Synchronisation Input
  • Low EMI
  • Fully Synchronous with integrated HS and LS FET
EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

MMWAVEICBOOST carrier card platform enables rapid evaluation of an mmWave sensor by providing modular interface to various sensor and antenna kits. This carrier card enables debug, emulation, and direct interface to mmWave tools through USB connectivity. Raw analog-to-digital (...)

Features
  • Modular connectivity to mmWave antenna plug-in module
  • BoosterPack™ plug-in module interface
  • Debug and emulation through onboard XDS110
  • DCA1000EVM interface for raw ADC data capture
  • Compatible with mmWave studio (MMWAVE-STUDIO) tools, including mmWave demo visualizer (MMWAVE-DEMO-VISUALIZER)

Design tools & simulation

SIMULATION MODELS Download
SNVMAN1.ZIP (8 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAN2.ZIP (118 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAN3.ZIP (8 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAN4.ZIP (116 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAN9.ZIP (8 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAO0.ZIP (119 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
17W System-Level Power Reference Design for Automotive Infotainment Processor Power
TIDA-00746 — TIDA-00746 is a 17W system-optimized SMPS design for automotive infotainment processor power. The design has been tested for and passed CISPR25 Class 5 conducted EMI  limits.  All buck converters used in this design is switching above AM band (>1.85MHz).

The design is divided into four major blocks:
  1. (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Infotainment Power System Reference Design for Automotive
PMP15014 — This solution is designed to be an automotive off-battery front end power supply for infotainment systems. It was created using a one stage power system meeting high voltage input needs and providing low voltage for multi output rails for different load needs. The system also provides transient and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive Off-Battery Processor Power Reference Design for ADAS and Infotainment
TIDA-00805 — The TIDA-00805 reference design is an off-battery automotive power solution targeting processors in advanced driver assistance systems (ADAS) like surround view, front camera and driver monitoring, as well as infotainment systems such as cluster and head unit. The design operates directly from a 3.9 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive instrument cluster power reference design with three outputs
PMP21669 — This reference design implements an automotive power supply solution for use in analog gauge clusters, hybrid clusters and cluster display systems. It provides 5 volt, 3.3 volt and 1.2 volt outputs suitable for powering all subsystems within an automotive instrument cluster, a cluster display, or an (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High efficiency power supply architecture reference design for protection relay processor module
TIDA-010011 — This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
CISPR 25 Class 5 USB Type-C™ Port Reference Design with USB 3.0 Data Support
TIDA-00987 — TIDA-00987 is a reference design for Automotive Media Ports that require data transfer. This design has the capability to support USB 2.0 and USB 3.0 data through a 15W USB Type-C™ port. Customers can accelerate their media port systems by taking advantage of a complete reference design (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Multi-Rail Power Reference Design for Eliminating EMI Effects in High Performance DAQ Systems
TIDA-01054 — The TIDA-01054 reference design helps eliminate the performance degrading effects of EMI on Data Acquisition (DAQ) systems greater than 16 bits with the help of the LM53635 buck converter. The buck converter enables the designer to place power solutions close to the signal path without the unwanted (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
ADC Voltage Reference Buffer Optimization Reference Design for High Performance DAQ Systems
TIDA-01055 — The TIDA-01055 reference design for high performance DAQ Systems optimizes the ADC reference buffer to improve SNR performance and reduce power consumption with the TI OPA837 high-speed op amp. This device is used in a composite buffer configuration and provides a 22% power improvement over (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Automotive 8 Channel Class D Amplifier with 2.1 MHz Switching Power Supply Reference Design
TIDA-00733 — TIDA-00733 is a reference design for an eight-channel, Class-D amplifier that is capable of driving 2-Ω loads and an off-battery step-down power supply with 5-V and  3.3-V outputs. The amplifier design provides audio inputs for each audio channel. A  high-performance audio (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Reference Design Optimizing FPGA Utilization and Data Throughput for Automatic Test Equipment
TIDA-01051 — The TIDA-01051 reference design is used to demonstrate optimized channel density, integration, power consumption, clock distribution and signal chain performance of very high channel count data acquisition (DAQ) systems such as those used in automatic test equipment (ATE). Using serializers, such as (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN-HR (RNL) 22 View options

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