The LM3241 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a
single Lithium-Ion cell. The device can also be used in many other applications. The device steps
down an input voltage from 2.7 V to 5.5 V to an adjustable output voltage from 0.6 V to 3.4 V. The
output voltage is set using a VCON analog input for controlling power levels and efficiency of the
The LM3241 offers three modes of operation. In PWM mode the device operates at a fixed
frequency of 6 MHz (typical) which minimizes RF interference when driving medium-to-heavy loads. At
light-load conditions, the device enters into Eco-mode automatically and operates with reduced
switching frequency. In Eco-mode, the quiescent current is reduced and extends the battery life.
Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typical).
The LM3241 is available in a 6-bump lead-free DSBGA package. A high-switching frequency
(6 MHz) allows use of tiny surface-mount components. Only three small external surface-mount
components, an inductor and two ceramic capacitors are required.
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