LM2738 550kHz/1.6MHz 1.5A Step-Down DC-DC Switching Regulator | TI.com

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550kHz/1.6MHz 1.5A Step-Down DC-DC Switching Regulator


Recommended alternative parts

  • LM27341  -  Higher Switching Frequency (2MHz) & Frequency Sync
  • LM27341-Q1  -  Higher Switching Frequency (2MHz) & Frequency Sync


The LM2738 regulator is a monolithic, high-frequency, PWM step-down DC-DC converter in an 8-pin WSON or 8-pin MSOP-PowerPAD package. It provides all the active functions for local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components, the LM2738 is easy to use. The ability to drive 1.5-A loads with an internal 250-mΩ NMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in the best power density available. Switching frequency is internally set to 550 kHz (LM2738Y) or 1.6 MHz (LM2738X), 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 enable is included, featuring an ultralow standby current of 400 nA. The LM2738 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 in-rush current, cycle-by-cycle current limit, thermal shutdown, and output over-voltage protection.


  • Space-Saving WSON and MSOP-PowerPAD Packages
  • 3-V to 20-V Input Voltage Range
  • 0.8-V to 18-V Output Voltage Range
  • 1.5-A Output Current
  • 550-kHz (LM2738Y) and 1.6-MHz (LM2738X) Switching Frequencies
  • 250-mΩ NMOS Switch
  • 400-nA Shutdown Current
  • 0.8-V, 2% Internal Voltage Reference
  • Internal Soft-Start
  • Current-Mode, PWM Operation
  • Thermal Shutdown

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WEBENCH® Designer LM2738

  Min   Max Range
Vin  V 3.0 to 20.0V
Vout  V 0.8 to 18V
Iout  A ≤ 1.5A
Ambient Temp  °C -40 to 125°C


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Part number Order 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) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Package Group Rating Type Package size: mm2:W x L (PKG)
LM2738 Order now 3     20     0.8     18     1.5     1     550     1600     1.9     Enable
Light Load Efficiency    
Current Mode     95     -40 to 125     HVSSOP | 8
WSON | 8    
Catalog     Converter     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)
8WSON: 9 mm2: 3 x 3 (WSON | 8)    
LM27341 Samples not available 3     20     1     18     1.5     1     1750     2300     2.4     Enable
Light Load Efficiency    
Current Mode     93     -40 to 125     HVSSOP | 10
WSON | 10    
Catalog     Converter     10HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 10)
10WSON: 9 mm2: 3 x 3 (WSON | 10)