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 > VIN/2.5.
●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 capacitors.
● 1.6 MHz (typ.) PWM Switching Frequency
● ACB Reduces Inductor Requirements and Size
● Operates From a Single Li-Ion Cell (2.7V to 5.5V)
● Dynamically Adjustable Output Voltage (0.5V to 3.4V)
● 2.5A Maximum Load Current
● Analog Bypass Function With Low Bypass Resistance
●(33 mΩ typ.)
● High Efficiency to 95% with Internal Synchronous
●Rectification
● 16-bump DSBGA Package
● Current Overload Protection
● Thermal Overload Protection
