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LM65635-Q1

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Automotive, 3V to 65V, 3.5A synchronous step-down converter optimized for power density and low EMI

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Data sheet

LM65635-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck Iout (max) (A) 3.5 Vin (max) (V) 65 Vin (min) (V) 3 Vout (max) (V) 40 Vout (min) (V) 0.8 Features Adjustable switching frequency, Auto Mode, Enable, Fixed Output, Forced PWM, Frequency synchronization, Overcurrent protection, Power good, Spread Spectrum, Thermal shutdown, UVLO adjustable EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Switching frequency (min) (kHz) 360 Switching frequency (max) (kHz) 2420 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150 Duty cycle (max) (%) 98 Type Converter
Rating Automotive Topology Buck Iout (max) (A) 3.5 Vin (max) (V) 65 Vin (min) (V) 3 Vout (max) (V) 40 Vout (min) (V) 0.8 Features Adjustable switching frequency, Auto Mode, Enable, Fixed Output, Forced PWM, Frequency synchronization, Overcurrent protection, Power good, Spread Spectrum, Thermal shutdown, UVLO adjustable EMI features Low parasitic Hotrod packaging, Spread Spectrum Control mode current mode Switching frequency (min) (kHz) 360 Switching frequency (max) (kHz) 2420 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150 Duty cycle (max) (%) 98 Type Converter
WQFN-FCRLF (RZT) 20 9.36 mm² 3.6 x 2.6
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Wide input voltage range: 3V to 65V (70V transient < 100ms)
    • Meets LV148 / ISO21780 requirements
  • Designed for low EMI requirements
    • Facilitates CISPR 25 class 5 compliance
    • Mode pin configurable ±5% or ±10% dual-random spread spectrum reducing peak emissions
    • Enhanced HotRod™ QFN package with symmetrical pinout
    • Switching frequency from 300kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
    • Internal compensation, current limit, and TSD
  • Low minimum on time: 40ns (maximum)
    • Enables 36VIN to 3.3VOUT conversion at 2.2MHz
  • High-efficiency power conversion at all loads
    • > 94% peak efficiency at 24VIN, 5VOUT, 400kHz
    • 2.5µA switching input current at no load
  • High power density
    • 3.6mm × 2.6mm, wettable flank, 20-pin package
    • Pin compatible with 36V LM654x0-Q1
    • ϴJA = 24.0°C/W (LM65645-Q1EVM)
  • Create a custom design using the LM656x5-Q1 with the WEBENCH Power Designer
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Wide input voltage range: 3V to 65V (70V transient < 100ms)
    • Meets LV148 / ISO21780 requirements
  • Designed for low EMI requirements
    • Facilitates CISPR 25 class 5 compliance
    • Mode pin configurable ±5% or ±10% dual-random spread spectrum reducing peak emissions
    • Enhanced HotRod™ QFN package with symmetrical pinout
    • Switching frequency from 300kHz to 2.2MHz
    • Pin-configurable AUTO or FPWM operation
    • Internal compensation, current limit, and TSD
  • Low minimum on time: 40ns (maximum)
    • Enables 36VIN to 3.3VOUT conversion at 2.2MHz
  • High-efficiency power conversion at all loads
    • > 94% peak efficiency at 24VIN, 5VOUT, 400kHz
    • 2.5µA switching input current at no load
  • High power density
    • 3.6mm × 2.6mm, wettable flank, 20-pin package
    • Pin compatible with 36V LM654x0-Q1
    • ϴJA = 24.0°C/W (LM65645-Q1EVM)
  • Create a custom design using the LM656x5-Q1 with the WEBENCH Power Designer

The LM656x5-Q1 are a family of automotive buck converters designed for high efficiency, high-power density, and ultra-low electromagnetic interference (EMI). The converters operate over a wide input voltage range of 3V to 65V (70V transient < 100ms), reducing the need for external input surge protection. The LM656x5-Q1 comes with pin selectable fixed output voltages of 3.3V and 5V or in adjustable configuration. The low EMI operation is enabled with minimized loop inductance and optimized switch node slew rate. A pin-selectable ±5% or ±10% dual-random spread spectrum (DRSS) significantly reduces peak emissions through a combination of triangular and pseudo-random modulation while keeping output voltage ripple very low. The current-mode control architecture with a 30ns typical minimum on-time allows high conversion ratios at high frequencies coupled with a fast transient response and excellent load and line regulation.

The LM656x5-Q1 are a family of automotive buck converters designed for high efficiency, high-power density, and ultra-low electromagnetic interference (EMI). The converters operate over a wide input voltage range of 3V to 65V (70V transient < 100ms), reducing the need for external input surge protection. The LM656x5-Q1 comes with pin selectable fixed output voltages of 3.3V and 5V or in adjustable configuration. The low EMI operation is enabled with minimized loop inductance and optimized switch node slew rate. A pin-selectable ±5% or ±10% dual-random spread spectrum (DRSS) significantly reduces peak emissions through a combination of triangular and pseudo-random modulation while keeping output voltage ripple very low. The current-mode control architecture with a 30ns typical minimum on-time allows high conversion ratios at high frequencies coupled with a fast transient response and excellent load and line regulation.
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* Data sheet LM656x5-Q1 High-Performance, 3V to 65V , Pin Compatible, 2.5A, 3.5A, 4.5A, Automotive , Low EMI, Synchronous Buck Converters datasheet (Rev. A) PDF | HTML 27 May 2025

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Evaluation board

LM65635EVM — LM65635 evaluation module

The LM65635EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LM656x5 family of wide-input-voltage buck converters. The LM65635EVM is configured to deliver a 5V output to a load requiring 3.5A or less. The LM65635EVM can be used in many different (...)
User guide: PDF | HTML
Not available on TI.com
Evaluation board

LM65645EVM — LM65645 evaluation module

The LM65645 evaluation module (EVM) helps designers evaluate the operation and performance of the LM65645 family of wide input voltage buck converters. The LM65645 family are easy-to-use synchronous step-down converters capable of supplying up to 2.5A, 3.5A or 4.5A of load current from an input (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

LM6x625 Transient SPICE Model

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WQFN-FCRLF (RZT) 20 Ultra Librarian
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