Thin SOT23 750mA Load Step-Down DC-DC Regulator - LM2736


Thin SOT23 750mA Load Step-Down DC-DC Regulator

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The LM2736 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components and online design support through WEBENCH, the LM2736 is easy to use. The ability to drive 750mA loads with an internal 350mΩ NMOS switch using state-of-the-art 0.5µm BiCMOS technology results in the best power density available. The world class control circuitry allows for on-times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 18V input operating range down to the minimum output voltage of 1.25V. Switching frequency is internally set to 550kHz (LM2736Y) or 1.6MHz (LM2736X), allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2736 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection.


  • Thin SOT-6 Package
  • 3.0V to 18V Input Voltage Range
  • 1.25V to 16V Output Voltage Range
  • 750mA Output Current
  • 550kHz (LM2736Y) and 1.6MHz (LM2736X) Switching Frequencies
  • 350mΩ NMOS Switch
  • 30nA Shutdown Current
  • 1.25V, 2% Internal Voltage Reference
  • Internal Soft-Start
  • Current-Mode, PWM Operation
  • WEBENCH Online Design Tool
  • Thermal Shutdown

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Parametrics Compare all products in Step-Down (Buck) Converter

Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Special Features
Control Mode
Vref Accuracy (Typ) (%)
Operating Temperature Range (C)
Approx. Price (US$)
LM2736 LM2734 LM2734-Q1 LM5010
1     1     1     1    
3     3     3     8    
18     20     20     75    
1.25     0.8     0.8     2.5    
16     18     18     70    
0.75     1     1     1    
Buck     Buck     Buck     Buck    
      Not Needed    
      Constant on-time (COT)    
Catalog     Catalog     Automotive     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
6SOT     6SOT     6SOT     10WSON
0.85 | 1ku     0.95 | 1ku     1.25 | 1ku     1.43 | 1ku    

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    Min   Max   Range  
  Vin V    3.00 – 18.00V  
  Vout V    1.25 – 16.00V  
  Iout A    ≤ 0.75A  
  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
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