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LM53625-Q1

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2.5-A, 36-V synchronous, 2.1-MHz, automotive step-down DC-DC converter

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Data sheet

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LMQ66430-Q1 ACTIVE Automotive 36-V, 3-A low EMI synchronous step-down converter with 1.5-µA IQ Smaller footprint, lower EMI with dual-random spread spectrum and lower IQ.
LMR33630AP-Q1 ACTIVE Automotive 3.8-V to 36-V, 3-A synchronous step-down voltage converter Lower output current

LM53625-Q1

ACTIVE
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Product details

Rating Automotive Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 2.5 Vin (min) (V) 3.5 Vin (max) (V) 42 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 EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Vout (min) (V) 3.2 Vout (max) (V) 10 Iq (typ) (µA) 18 Duty cycle (max) (%) 98
Rating Automotive Operating temperature range (°C) -40 to 150 Topology Buck Type Converter Iout (max) (A) 2.5 Vin (min) (V) 3.5 Vin (max) (V) 42 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 EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Vout (min) (V) 3.2 Vout (max) (V) 10 Iq (typ) (µA) 18 Duty cycle (max) (%) 98
VQFN-HR (RNL) 22 20 mm² 5 x 4
  • 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 urrent at no load (typical) with 3.3-V output
  • 5.0-mm × 4.0-mm VQFN package with or without 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
  • 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 urrent at no load (typical) with 3.3-V output
  • 5.0-mm × 4.0-mm VQFN package with or without 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

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.

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

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Type Title Date
* Data sheet LM53625/35-Q1, 2.5-A or 3.5-A, 36-V Synchronous, 2.1-MHz, Step-Down DC-DC Converter datasheet (Rev. B) PDF | HTML 29 Jul 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Technical article Optimizing flip-chip IC thermal performance in automotive designs PDF | HTML 11 Dec 2019
Technical article How to meet European Commission ADAS requirements with TI DC/DC converters PDF | HTML 09 May 2019
Design guide Automated Parking System Reference Design Using 77-GHz mmWave Sensor 24 Jan 2019
Technical article How a DC/DC converter package and pinout design can enhance automotive EMI perform PDF | HTML 04 Sep 2018
Application note Designing High Performance, Low-EMI, Automotive Power Supplies 30 Sep 2017
Technical article Discrete SBCs: versatile and scalable solutions for any application PDF | HTML 27 Jul 2017
Technical article What to consider when designing an automotive power supply PDF | HTML 27 Jun 2016

Design & development

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

Evaluation board

DS90UB9702-Q1EVM — DS90UB9702-Q1 evaluation module

The DS90UB9702-Q1EVM evaluation module (EVM) is a functional board design for evaluating the DS90UB9702-Q1 FPD-Link IV deserializer hub. The DS90UB9702-Q1 is a versatile deserializer capable of receiving data from up to four independent video sources using FPD-Link III and FPD-Link IV serializers. (...)
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Evaluation board

LM536253QEVM — LM536253-Q1 2.5A 3.3V Fixed Output Wide Vin Synchronous 2.1MHz Automotive Step-Down Converter EVM

This EVM demonstrates the capabilities of the LM536253 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 (...)
User guide: PDF
Not available on TI.com
Evaluation board

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The MMWAVEICBOOST carrier card expands capabilities of select 60 GHz mmWave evaluation modules. This board provides advanced software developement, debug features such as trace and single step via TI’s Code Composers compatible debuggers. On-board Launchpad interface enables pairing with (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

LM536253-Q1 PSpice Transient Model

SNVMAN5.ZIP (120 KB) - PSpice Model
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Simulation model

LM536253-Q1 Unencrypted PSpice Transient Model

SNVMAN6.ZIP (8 KB) - PSpice Model
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Simulation model

LM536255-Q1 PSpice Transient Model

SNVMAN7.ZIP (117 KB) - PSpice Model
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Simulation model

LM536255-Q1 Unencrypted PSpice Transient Model

SNVMAN8.ZIP (7 KB) - PSpice Model
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Simulation model

LM53625A-Q1 PSpice Transient Model

SNVMAO1.ZIP (120 KB) - PSpice Model
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Simulation model

LM53625A-Q1 Unencrypted PSpice Transient Model

SNVMAO2.ZIP (8 KB) - PSpice Model
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Reference designs

TIDA-020011 — Automotive mmWave radar gesture control reference design

This reference design utilizes mmWave Radar and a full automotive power design to provide a sleek, simple solution to capture hand gestures and improve the experience of the driver. The evolution of the automobile has led to the desire for simpler and easier interaction with the ever increasing (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01425 — Automotive Stand-Alone Gateway Reference Design with Ethernet and CAN

The TIDA-01425 is a subsystem reference design for automotive gateways focused on increasing bandwidth and processing power in gateway applications. The design implements Ethernet physical layer transceivers (PHYs) for increased bandwidth along with an automotive processor for greater processing (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01570 — Automotive 77-GHz radar module reference design with object data output

TIDA-01570 is a reference design for a 76- to 81-GHz radar sensor module. The power supplies on board convert the automotive battery input to the required rails for the radar analog front end (AFE), processors and CAN-FD transceiver. After processing, object data is provided over the included N-FD (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-020004 — Automotive RFCMOS 77GHz radar module reference design with object data output over dual CAN FD

This reference design is a solution for a 76 to 81 GHz radar sensor module. The power supplies on board convert the automotive battery input to the required rails for the radar AFE, processors and CAN FD transceiver. All of these functions are included in a small form factor PCB suitable for front (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP30548 — Small automotive front-end 16-W power reference design

This reference design is an automotive front-end power supply able to provide 16 W for the 12-V car battery. The first stage is a pre-boost LM5150-Q1 to maintain a stable, mid-rail voltage of 8.5 V during cold-crank operation. Two downstream buck converters are able to handle jump start (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-010011 — High efficiency power supply architecture reference design for protection relay processor module

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 (...)
Design guide: PDF
Schematic: PDF
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