LM53635-Q1 (ACTIVE)

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

2.5/3.5A, 36 V Synchronous, 2.1MHz, Automotive Step Down DC-DC Converter - LM53635-Q1


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.


  • 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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Parametrics Compare all products in Buck Converter (Integrated Switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
Forced Pulse Width Modulation (FPWM) Mode
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Wettable Flanks Package   
Current Mode   
-40 to 150   
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WEBENCH® Designer LM53635-Q1

  Min   Max Range
Vin  V 3.5 to 36.0V
Vout  V 3.3 to 10V
Iout  A ≤ 3.5A
Ambient Temp  °C -40 to 150°C

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