LM3248
www.ti.com SNVSA01A – JULY 2013 – REVISED SEPTEMBER 2013 LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter
with Boost and Active Current Assist and Analog Bypass (ACB)
Check for Samples: LM3248 FEATURES DESCRIPTION The LM3248 is a PWM/PFM Boost-Buck DC/DC
converter that provides efficient utilization of battery
power over a wide voltage range. The device
architecture is suitable for advanced RF front-end
systems that demand dynamic voltage and current to
support converged power amplifier architectures
operating in 2G/3G/4G and 3GPP/LTE modes. For
example, the LM3248 is designed to produce higher
output voltages while maintaining PFM mode as
required by some new reduced-power CMOS PAs.
The extremely fast Boost-Buck function reduces RF
PA overhead power dissipation, extending battery talk
time. The device will operate at input voltage VIN
range of 2.7V to 5.5V and an adjustable output
voltage VOUT range of 0.4V to 4.0V at a maximum
current load of 2.5A. 1 2 Output Voltage VOUT Adjustable from 0.4V to
4.0V (typ.)
Input Voltage Range VIN from 2.7V to 5.5V
Boost-Buck and Buck (Boost-Bypass)
Operating Modes with Seamless Transition …
