Product details


Vin (Min) (V) 3 Vin (Max) (V) 5.5 Vout (Min) (V) 3.3 Vout (Max) (V) 3.3 Iout (Max) (A) 1.2 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 5400 Switching frequency (Max) (kHz) 6600 Features Enable, Light Load Efficiency Control mode Voltage Mode Duty cycle (Max) (%) 100 Type Converter Operating temperature range (C) -30 to 90 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

DSBGA (YFQ) 6 0 mm² 1.2 x 1.475 open-in-new Find other Buck converters (integrated switch)


  • Operates from a Single Li-Ion Cell (3 V to 5.5 V)
  • 6-MHz (typ.) PWM Switching Frequency
  • Fixed Output Voltage: 3.3 V
  • Up to 1.2-A Maximum Load Capability
  • High Efficiency: 94% (typ.) with 3.8-V VIN at 300 mA
  • Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA
  • Low IQ: 16 µA typical, 25 µA maximum
  • Automatic ECO/PWM/Bypass Mode Change
  • Forced PWM Mode for Low Output-Voltage Ripple
  • Soft-Start Limits Input Current on Start-Up
  • Current Overload Protection
  • Thermal Overload Protection
  • Small Total Solution Size: < 7.5 mm2
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The LM3281 is a high-efficiency low-noise miniature DC-DC converter optimized for powering noise-sensitive wireless connectivity chipsets and RF Front End Modules (FEMs) from a single Lithium-Ion cell. The LM3281 is ideal for “always on” applications with very low unloaded quiescent current of 16 µA (typ.).

The LM3281 steps down an input supply voltage to a fixed output voltage of 3.3 V with output current up to 1200 mA. Five different modes of operation are used to optimize efficiency and minimize battery drain. In Pulse Width Modulation (PWM) mode, the device operates at a fixed frequency of 6 MHz which minimizes RF interference when driving medium-to-heavy loads. At light load, the device automatically enters into Economy (ECO) mode with reduced quiescent current. In a low-battery voltage condition, a bypass mode reduces the voltage dropout to 60 mV (typ.) at 600 mA. If very low output voltage ripple is desired at light loads, the device can also be forced into PWM mode. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typ.).

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Technical documentation

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Type Title Date
* Datasheet LM3281 3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter for Wireless Connectivity Solutions datasheet Nov. 24, 2014
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical articles Get the noise out of my IoT Apr. 17, 2015
User guides Using the LM3281 Evaluation Module Nov. 24, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

LM3281EVM facilitates the evaluation of the LM3281 1.2A, 3.3V miniature step down DC-DC converter IC.  It is a high efficiency low noise buck converter optimized for powering noise-sensitive wireless connectivity chipsets and RF front end modules (FEM).  The unique analog bypass feature (...)

  • Small solution size
  • Superior transient response
  • Very low dropout analog bypass mode
  • Low quiescent current

Reference designs

Small Size, Low Noise and High PSRR Power Reference Design for CMOS Image Sensors
TIDA-00718 The TIDA-00718 reference design provides a small size and high input voltage ripple rejection power supply to provide a stable and clean voltage source for CMOS image sensors. In this design a main power rail of 5 V from battery, Power over Ethernet (PoE) or DC adaptor is regulated down to three (...)
document-generic Schematic document-generic User guide
High Efficiency Low-Noise Buck Converter for WLAN Front End Modules & Transceivers Reference Design
TIDA-00532 TIDA-00532 is a miniature, High Efficiency, low noise power supply for WLAN applications.
document-generic Schematic document-generic User guide

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