3A, 3.5V-to-36V, Wide-Vin, Synchronous 2.1MHz Step-Down Converter - LM53603

LM53603 (ACTIVE)

3A, 3.5V-to-36V, Wide-Vin, Synchronous 2.1MHz Step-Down Converter

 

Description

The LM53603 and LM53602 buck regulators are specifically designed for 12-V industrial and automotive applications, providing an adjustable output voltage from 3.3 V to 10 V at 3 A or 2 A, from an input voltage of up to 36 V. Advanced high-speed circuitry allows the device to regulate from an input of up to 20 V, while providing an output of 5 V at a switching frequency of 2.1 MHz. The innovative architecture allows the device to regulate a 3.3-V output from an input voltage of only 3.5 V. All aspects of this product are optimized for the industrial and automotive customer. An input voltage range up to 36 V, with transient tolerance up to 42 V, eases input surge protection design. An open-drain reset output, with 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, along with a no-load operating current of only 24 µA, ensures high efficiency and superior transient response at all loads.

Features

  • 3-A or 2-A Maximum Load Current
  • Input Voltage Range From 3.5 V to 36 V: Transients to 42 V
  • Adjustable Output Voltage From 3.3 V to 10 V
  • 2.1-MHz Fixed Switching Frequency
  • ±2% Output Voltage Tolerance
  • –40°C to 150°C Junction Temperature Range
  • 1.7-µA Shutdown Current (Typical)
  • 24-µA Input Supply Current at No Load (Typical)
  • Reset Output With Filter and Delay
  • Automatic Light Load Mode for Improved Efficiency
  • User-Selectable Forced PWM Mode (FPWM)
  • Built-In Loop Compensation, Soft-Start, Current Limit, Thermal Shutdown, UVLO, and External Frequency Synchronization
  • Thermally Enhanced 16-Lead Package: 5 mm × 4.4 mm × 1 mm

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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)
Special Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM53603 LM43603 LM53602 LM53635-Q1 LMR14030 LMR23625 LMR23630
3.5    3.5    3.5    3.5    4    4.5    4.5   
42    36    42    42    40    36    36   
3.2    1    3.2    3.2    1    1    1   
9.9    28    9.9    10    36    30    30   
3    3    2    3.5    3.5    2.5    3   
1    1    1    1    1    1    1   
1850    200    1850    1850    200    200    200   
2350    2200    2350    2350    2500    2200    2200   
0.023    0.027    0.023    0.018    0.04    0.075    0.075   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Tracking
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
98    99    98    98    98    97    97   
-40 to 125    -40 to 125    -40 to 125    -40 to 150    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Automotive    Catalog    Catalog    Catalog   
HTSSOP    HTSSOP
SON   
HTSSOP    VQFN-HR    SO PowerPAD    SO PowerPAD
SON   
SO PowerPAD
SON   

Other qualified versions of LM53603

Version Part Number Definition
Automotive LM53603-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer LM53603

  Min   Max Range
Vin  V 3.5 to 36.0V
Vout  V 3.3 to 10V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 150°C


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