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 Iq (Typ) (uA) 15 Switching frequency (Min) (kHz) 5400 Switching frequency (Max) (kHz) 6600 Features Enable, Light Load Efficiency Operating temperature range (C) -30 to 90 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 3 Vin (Max) (V) 5.5 Vout (Min) (V) 3.3 Vout (Max) (V) 3.3 Iout (Max) (A) 1.2 Iq (Typ) (uA) 15 Switching frequency (Min) (kHz) 5400 Switching frequency (Max) (kHz) 6600 Features Enable, Light Load Efficiency Operating temperature range (C) -30 to 90 Rating Catalog Regulated outputs (#) 1
DSBGA (YFQ) 6 0 mm² 1.2 x 1.475
  • 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
  • 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

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.).

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

Design & development

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Evaluation board

LM3281EVM — LM3281EVM 1.2A, 3.3V Miniature Step Down DC-DC Converter with Analog Bypass

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 (...)

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PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs

TIDA-00718 — Small Size, Low Noise and High PSRR Power Reference Design for CMOS Image Sensors

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 (...)
Reference designs

TIDA-00532 — High Efficiency Low-Noise Buck Converter for WLAN Front End Modules & Transceivers Reference Design

TIDA-00532 is a miniature, High Efficiency, low noise power supply for WLAN applications.
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