LMS3635-Q1 (ACTIVE)

3.5A /5.5A, 36V Synchronous, 400kHz, Step-Down Converter

 

Description

The LMS3635-Q1 and LMS3655-Q1 synchronous buck regulators are optimized for high performance applications, providing an output voltage of 3.3 V, 5 V, or an adjustable output of 1 V to 15 V. Seamless transition between PWM and PFM modes, along with a low quiescent current, ensures high efficiency and superior transient responses at all loads.

Advanced high-speed circuitry allows the LMS3655-Q1 to regulate an input of 24 V to an output of 3.3 V at a fixed frequency of 400 kHz while also enabling a continuous load current of 5.5 A. An innovative frequency foldback architecture allows this device to regulate a 3.3-V output from an input voltage of only 3.5 V. The input voltage can range up to 36 V, with transient tolerance up to 42 V, easing input surge protection design.

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.

Features

  • AEC-Q100 Qualified for Automotive Applications
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM Classification Level 2
    • Device CDM Classification Level C6
  • 96% Peak Efficiency While Converting 12 V to 5 V
  • Low EMI and Minimized Switch Node Ringing
  • 400-kHz (±10%) Fixed Switching Frequency
  • –40°C to +150°C Junction Temperature Range
  • External Frequency Synchronization
  • RESET Output With Internal Filter and 3-ms Release Timer
  • Automatic Light Load Mode for Improved Efficiency
  • Pin-Selectable Forced PWM Mode
  • Built-In Compensation, Soft Start, Current Limit, Thermal Shutdown, and UVLO
  • 0.35-V Dropout With 3.5-A Load at 25°C (Typical)
  • 18-µA IQ_VIN: Quiescent Current at 3.3 VOUT and No Load (Typical)
  • Output Voltage: 5 V, 3.3 V, and ADJ (1 V to 15 V)
  • ±1.5% Reference Voltage Tolerance

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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)
Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LMS3635-Q1 LM53600-Q1 LM53601-Q1 LM53602-Q1 LM53603-Q1 LM53625-Q1 LM53635-Q1 LM73605-Q1 LM73606-Q1 LMR14050-Q1 LMS3655-Q1
3.5    3.5    3.5    3.5    3.5    3.5    3.5    3.5      4    3.5   
42    42    42    42    42    42    42    36      40    42   
1    3.3    3.2    3.2    3.2    3.2    3.2    1    1    1    1   
15    9.9    6    9.9    9.9    10    10    34    34    30    15   
3.5    0.65    1    2    3    2.5    3.5    5    6    5    5.5   
1    1    1    1    1    1    1    1    1    1    1   
250    1890    1890    1850    1850    1850    1850    350    350    200    250   
500    2400    2400    2350    2350    2350    2350    2200    2200    2500    500   
0.015    0.023    0.023    0.023    0.023    0.018    0.018    0.015    0.015    0.04    0.015   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification   
Enable
Forced Pulse Width Modulation (FPWM) Mode
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Wettable Flanks Package   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification   
Spread Spectrum
Synchronous Rectification   
Enable
Forced Pulse Width Modulation (FPWM) Mode
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Wettable Flanks Package   
Enable
Forced Pulse Width Modulation (FPWM) Mode
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Wettable Flanks Package   
Enable
Forced Pulse Width Modulation (FPWM) Mode
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Fixed
Wettable Flanks Package   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Tracking
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
98    98    98    98    98    98    98    96    96    98    98   
-40 to 150    -40 to 150    -40 to 150    -40 to 150    -40 to 150    -40 to 150    -40 to 150    -40 to 125    -40 to 125    -40 to 125    -40 to 150   
Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive   
VQFN-HR    WSON    WSON    HTSSOP    HTSSOP    VQFN-HR    VQFN-HR    WQFN    WQFN    SO PowerPAD
WSON   
VQFN-HR   

WEBENCH® Designer LMS3635-Q1

  Min   Max Range
Vin  V 3.30 to 36.0V
Product Option
Vout  V 3.3 to 3.3V
Iout  A ≤ 0.20 to 3.50A
Ambient Temp  °C -40 to 150°C