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LM3281
SNVSA38 – NOVEMBER 2014...
Product Folder
Sample & Buy
Technical Documents
Tools & Software
Support & Community
LM3281
SNVSA38 – NOVEMBER 2014
LM3281 3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter for Wireless Connectivity Solutions
1 Features
1 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
2 Applications
WLAN, WiFi Station Devices WiFi RF PC Cards Battery-Powered RF Devices
3 Description
The LM3281 is a high-efficiency low-noise miniature DC-DC converter optimized for powering noisesensitive 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 i...
