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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