The LM3212 is a DC-DC converter optimized for powering GSM RF power amplifiers (PAs) from
a single Lithium-Ion cell; however, it may also be used in other applications. The LM3212 steps
down an input voltage from 2.7V to 5.5V to a dynamically adjustable output voltage of 0.5V to 3.4V.
The output voltage is set through a VCON analog input that adjusts the output voltage to ensure
efficient operation at all power levels of the RF PA.
The LM3212 has a unique Active Current Bypass (ACB) feature that speeds up output voltage
transition times, provides extra drive and a low-resistance analog bypass. The LM3212 has an
AUTO_BY pin to force the LM3212 into bypass mode during low input-voltage operation thus overriding
the automatic analog bypass feature. Forced bypass can also be achieved by setting VCON >
In addition the LM3212 offers a fixed-frequency PWM mode to minimize RF interference and
a shutdown mode to turn the device off and reduce battery consumption to 0.02 µA (typ.)
The LM3212 is available in a 16-bump lead-free DSBGA package. A 1.6 MHz switching
frequency allows use of tiny surface-mount components for the required inductor and two ceramic
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