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Software 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 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 ВµA (typ.). 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 ВµA typical, 25 ВµA maximum
Automatic ECO/PWM/Bypass Mode Change
Forced PWM Mode for Low Output-Voltage Ripple
Soft-Start Limits Input Current on Start-Up …
