1FEATURES

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

• 2.5A Load Current Capability

• High Conversion Efficiency (> 90% typ.)

• High-Efficiency PFM/PWM Modes with

Seamless Transition

• Very Fast Transient Response: 10 μs

• ACB Reduces Inductor Size Requirements

• Dither to aid RX Band Noise Compliance

APPLICATIONS

• Multi-mode 2G/3G/4G and 3GPP/LTE Smart-

phones and Tablets

• Hand-Held Radios

• RF Mobile Devices

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.

The LM3248 is available in a 30-bump, lead-free thin

DSBGA package.