SIMPLE SWITCHER 4.5V to 42V, 0.3A Step-Down DC/DC Switching Regulator in SOT-23 - LMR14203

LMR14203 (ACTIVE)

SIMPLE SWITCHER 4.5V to 42V, 0.3A Step-Down DC/DC Switching Regulator in SOT-23

 

Description

The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LMR14203 is optimized for up to 300 mA load current.

Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LMR14203 is available in a low profile SOT-6L package.

Features

  • Input Voltage Range of 4.5V to 42V
  • Output Voltage Range of 0.765V to 34V
  • Output Current up to 0.3A
  • 1.25 MHz Switching Frequency
  • Low Shutdown Iq, 16 µA Typical
  • Short Circuit Protected
  • Internally Compensated
  • Soft-Start Function
  • Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)
  • Fully Enabled for WEBENCH® Power Designer

Performance Benefits

  • Tight Accuracy for Powering Digital ICs
  • Extremely Easy to Use
  • Tiny Overall Solution Reduces System Cost

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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
Approx. Price (US$)
LMR14203 LMR14006 LMR14206 LMR16006
4.5    4    4.5    4   
42    40    42    60   
0.765    0.8    0.765    0.8   
34    30    34    55   
0.3    0.6    0.6    0.6   
1    1    1    1   
950    1100    950    700   
1500    2100    1500    2100   
1.3    0.028    1.3    0.028   
Enable    Enable
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable   
Enable    Enable
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable   
Current Mode    Current Mode    Current Mode    Current Mode   
87    97    87    97   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog   
SOT    SOT    SOT    SOT   
0.90 | 1ku    1.10 | 1ku    0.99 | 1ku    1.20 | 1ku   
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WEBENCH® Designer LMR14203

  Min   Max Range
Vin  V 4.5 to 42.0V
Vout  V 0.77 to 40.0V
Iout  A ≤ 0.3A
Ambient Temp  °C -40 to 125°C


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