Low Iq, Wide Input Range Synchronous Buck Controller - LM5141


Low Iq, Wide Input Range Synchronous Buck Controller



The LM5141 is a synchronous buck controller, intended for high voltage wide VIN step-down converter applications. The control method is peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. The LM5141 features slew rate control to simplify the compliance with EMI requirements.

The LM5141 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate Drivers with Slew Rate Control that can be adjusted to reduce EMI.

In light or no-load conditions, the LM5141 operates in skip cycle mode for improved low power efficiency. The LM5141 has a high voltage bias regulator with automatic switch-over to an external bias to reduce the IQ current from VIN. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode fault protection for sustained overload, and power good output.


  • –40ºC to +125ºC Ambient Operating Temperature Range
  • An AEC-Q100 Qualified Device is Available
  • VIN 3.8 V to 65 V (70 V Absolute Maximum)
  • Output: Fixed 3.3 V, 5 V, or Adjustable From
    1.5 V - 15 V with ±0.8% Accuracy
  • Fixed 2.2 MHz or 440 kHz Switching Frequency with ±5% Accuracy
  • High-Side and Low-Side Gate Drive With Slew Rate Control
  • Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
  • Optional Synchronization to an External Clock
  • Optional Spread Spectrum
  • Shutdown Mode IQ: 10 µA Typical
  • Low Standby Mode IQ: 35 µA Typical
  • 75 mV Current Limit Threshold with ±0.9% Accuracy
  • External Resistor or DCR Current Sensing
  • Output Enable Logic Input
  • Hiccup Mode for Sustained Overload
  • Power Good Indication Output
  • Selectable Diode Emulation or Forced Pulse Width Modulation
  • QFN-24 Package with Wettable Flanks
  • Create a Custom Design Using the LM5141 With the WEBENCH® Power Designer

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Parametrics Compare all products in Buck Controller (External Switch)

Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Number of Phases
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Special Features
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
Control Mode
LM5141 LM5116 LM5117 TPS40170
3.8    6    5.5    4.5   
65    100    65    60   
1.5    1.215    0.8    0.6   
15    80    62    57   
20    20    20    20   
1    1    1    1   
1    1    1    1   
350    50    50    100   
2600    1000    750    600   
0.035    4.6    4.8    4.5   
Adjustable Current Limit
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
UVLO Fixed   
Adjustable Current Limit
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
99    98    98    95   
-40 to 125    -40 to 150    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog   
Current Mode      Current Mode    Voltage Mode   

Other qualified versions of LM5141

Version Part Number Definition
Automotive LM5141-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer LM5141

  Min   Max Range
Vin  V 3.8 to 65.0V
Vout  V 1.5 to 15V
Iout  A ≤ 10A
Ambient Temp  °C -40 to 125°C

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