LM3253 Description
The LM3253 is a DC-DC converter optimized for powering multi-mode 2G/3G/4G RF power amplifiers (PAs) from a single Lithium-Ion cell. The LM3253 steps down an input voltage from 2.7V to 5.5V to a dynamically adjustable output voltage of 0.4V to 3.6V. 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.
LM3253 Key Features
- 2 High-Efficiency PFM and PWM Modes with Internal Synchronous Rectification
- Analog Bypass Function with Low Dropout Resistance (45 mΩ typ.)
- Dynamically Adjustable Output Voltage, 0.4V to 3.6V (typ.), in PFM and PWM modes
- 3A Maximum Load Current in PWM Mode
- 2.7MHz (average) PWM Switching Frequency
- Modulated Switching Frequency to Aid Rx
- Operates From a Single Li-ion Cell
- ACB Reduces Inductor Requirements and Size
- Minimum Total Solution Size by Using Small
- 16-bump Thin DSBGA Package