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SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015 LM3243 High-Current Step-Down Converter for 2G, 3G, and 4G RF Power Amplifiers
1 Features 3 Description The LM3243 is a DC-DC converter optimized for
powering multi-mode 2G, 3G, and 4G RF power
amplifiers (PAs) from a single Lithium-Ion cell. The
LM3243 steps down an input voltage from 2.7 V to
5.5 V to a dynamically adjustable output voltage of
0.4 V to 3.6 V. 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. 1 Input Voltage Range: 2.7 V to 5.5 V
High-Efficiency PFM and PWM Modes With
Internal Synchronous Rectification
Analog Bypass Function with Low Dropout
Resistance (45 mΩ Typical)
Dynamically Adjustable Output Voltage: 0.4 V to
3.6 V (Typical) in PFM and PWM Modes
Maximum Load Current: 2.5 A in PWM Mode …
