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


Product details


Vin (Min) (V) 3 Vin (Max) (V) 20 Vout (Min) (V) 0.8 Vout (Max) (V) 18 Iout (Max) (A) 1.5 Iq (Typ) (uA) 1900 Switching frequency (Min) (kHz) 550 Switching frequency (Max) (kHz) 1600 Features Enable, Light Load Efficiency Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HVSSOP (DGN) 8 9 mm² 3 x 3 WSON (NGQ) 8 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • 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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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.

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Technical documentation

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Type Title Date
* Data sheet LM2738 550-kHz/1.6-MHz 1.5-A Step-Down DC-DC Switching Regulator datasheet (Rev. C) Sep. 25, 2015
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guide AN-1837 LM2738 Evaluation Board (Rev. A) Apr. 25, 2013

Design & development

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Hardware development

document-generic User guide

The LM2738 demo board is configured to convert 12V input to 3.3V output at 1.5A load current using the LM2738X 1.6MHz or the LM2738Y 550kHz step down DC-DC regulator. The tiny low profile eMSOP-8 and LLP-8 packages allows the demo board to be manufactured using just over one square inch of a 4-layer (...)

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CAD/CAE symbols

Package Pins Download
HVSSOP (DGN) 8 View options
WSON (NGQ) 8 View options

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