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2.5A Adjustable Boost-Buck RF DC/DC Converter

Inventory: 2,250

Quality information

RoHS Yes
Lead finish / Ball material SNAGCU
MSL rating / Peak reflow Level-1-260C-UNLIM
Material content View
DPPM / MTBF / Fit rate View
Qualification summary View
Ongoing reliability monitoring View
Device marking View

Packaging information

Package | Pins Package qty | Carrier Operating temperature range (°C)
DSBGA (YFQ) | 30 250 | SMALL T&R
-30 to 90
Package | Pins DSBGA (YFQ) | 30
Package qty | Carrier 250 | SMALL T&R
Operating temperature range (°C) -30 to 90
View TI packaging information

Features for the LM3248

  • 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

Description for the LM3248

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.

The LM3248 utilizes step-up (Boost) and variable output step-down (Buck) DC/DC converters. Combining a cascaded Boost and Buck converter in a single package is ideal for powering the latest multimode/multi-standard RF power amplifiers. The Boost converter provides the RF power subsystem the capability to operate at lower battery voltages as well as to maintain increased PA linearity and transmit power margins over a wider battery voltage supply range.

The Buck has a unique Active Current assist and analog Bypass (ACB) feature to minimize inductor size without any loss of output regulation for the entire battery voltage and RF output power range, until dropout. ACB provides a parallel current path, when needed, to limit the maximum inductor current while still driving a 2.5A load. The LM3248 may also be configured as a Buck-only converter with a boost bypass feature to enable highest efficiency operation with minimal dropout voltage when the Boost is not needed.

The LM3248 automatically and seamlessly transitions between Pulse Width Modulation (PWM) and Pulse Frequency Modulation (PFM) modes for high-efficiency operation with both full and light load conditions.


Qty Price (USD)
1-99 2.191
100-249 1.809
250-999 1.3
1,000+ 0.978

Additional package qty | carrier options

Package qty | Carrier 3,000 | LARGE T&R
Inventory 5,984
Qty | Price (USD) 1ku | 0.85 1-99 1.904 100-249 1.573 250-999 1.13 1,000+ 0.85
Custom reel may be available