LM26003 (ACTIVE)

3A Switching Regulator with High Efficiency Sleep Mode

3A Switching Regulator with High Efficiency Sleep Mode - LM26003

Recommended alternative parts

  • LM26003-Q1  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 


The LM26003 is a switching regulator designed for the high-efficiency requirements of applications with standby modes. The device features a low-current sleep mode to maintain efficiency under light-load conditions and current-mode control for accurate regulation over a wide input voltage range. Quiescent current is reduced to 10.8 µA typically in shutdown mode and less than 40 µA in sleep mode. Forced PWM mode is also available to disable sleep mode.

The LM26003 device can deliver up to 3 A of continuous load current with a fixed current limit, through the internal N-channel switch. The part has a wide input voltage range of 4.0 V to 38 V and can operate with input voltages as low as 3 V during line transients.

Operating frequency is adjustable from 150 kHz to 500 kHz with a single resistor and can be synchronized to an external clock.

Other features include Power Good, adjustable soft-start, enable pin, input undervoltage protection, and an internal bootstrap diode for reduced component count.


  • LM26003-Q1 is an Automotive-Grade Product
    That is AEC-Q100 Grade 1 Qualified (–40°C to
    +125°C Operating Junction Temperature)
  • High-Efficiency Sleep Mode
  • 40-µA Typical Iq in Sleep Mode
  • 10.8-µA Typical Iq in Shutdown Mode
  • 3.0-V Minimum Input Voltage
  • 4.0-V to 38-V Continuous Input Range
  • 1.5% Reference Accuracy
  • Cycle-by-Cycle Current Limit
  • Adjustable Frequency (150 kHz to 500 kHz)
  • Synchronizable to an External Clock
  • Power Good Flag
  • Forced PWM Function
  • Adjustable Soft-Start
  • 20-Pin HTSSOP Package
  • Thermal Shut Down

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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
LM26003 LM26003-Q1
3    3   
38    38   
1.25    1.25   
35    35   
3    3   
1    1   
150    150   
500    500   
0.04    0.04   
Light Load Efficiency
Power Good
Pre-Bias Start-Up   
Light Load Efficiency
Power Good
Pre-Bias Start-Up   
Current Mode    Current Mode   
98    98   
-40 to 125    -40 to 125   
Catalog    Automotive   

Other qualified versions of LM26003

Version Part Number Definition
Automotive LM26003-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer LM26003

  Min   Max Range
Vin  V 4.0 to 38.0V
Vout  V 1.25 to 25V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 125°C

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