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Product details

Parameters

Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 0.4 Vout (Max) (V) 4 Iout (Max) (A) 2.5 Switching frequency (Min) (kHz) 2700 Switching frequency (Max) (kHz) 2700 Features Fixed Output Operating temperature range (C) -30 to 90 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

DSBGA (YFQ) 30 0 mm² 2.463 x 2.839 open-in-new Find other Buck converters (integrated switch)

Features

  • 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
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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.

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.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 3
Type Title Date
* Datasheet LM3248 2.7MHz, 2.5A Adj. Boost-Buck DC/DC Cnvtr w/ Auto-Boost & ACB datasheet (Rev. A) Sep. 25, 2013
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guide Using the LM3248 Evaluation Module Sep. 27, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
99
Description

The LM3248 evaluation module (EVM) helps designers evaluate the performance of step-up(Boost) and step-down(Buck)  DC-DC converter for multimode/multi standard RF Power Amplifier operating in 2G/3G/4G and 3GPP/LTE modes.

Features
  • Active Current Assist to reduce inductor size
  •  Operate from a single Li-ion cell: 2.7V to 5.5V
  •  Dynamically adjustable from 0.4V to 3.6V on Buck mode and Boost mode
  •  2.5A maximum load capability in PWM mode
  •  Automatic PWM/PFM/Bypass mode change

 

Design tools & simulation

SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YFQ) 30 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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