LM3243

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2.7MHz, 2.5A Step-Down DC-DC Converter with Analog Bypass Mode for 2G/3G/4G PAs

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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) 3.6 Iout (Max) (A) 2.5 Switching frequency (Min) (kHz) 2430 Switching frequency (Max) (kHz) 2970 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) 16 0 mm² 2.059 x 2.059 open-in-new Find other Buck converters (integrated switch)

Features

  • Input Voltage Range: 2.7 V to 5.5 V
  • High-Efficiency PFM and PWM Modes With
    Internal Synchronous Rectification
  • Analog Bypass Function with Low Dropout
    Resistance (45 mΩ Typical)
  • Dynamically Adjustable Output Voltage: 0.4 V to
    3.6 V (Typical) in PFM and PWM Modes
  • Maximum Load Current: 2.5 A in PWM Mode
  • PWM Switching Frequency: 2.7 MHz (Average)
  • Modulated Switching Frequency to Aid Rx Band
    Compliance
  • Operates From a Single Li-ion Cell
    (2.7 V to 5.5 V)
  • Current and Thermal Overload Protection
  • ACB Reduces Inductor Requirements and Size
  • Minimum Total Solution Size by Using Small
    Footprint and Case Size Inductor and Capacitors
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Description

The LM3243 is a DC-DC converter optimized for powering multi-mode 2G, 3G, and 4G RF power amplifiers (PAs) from a single Lithium-Ion cell. The LM3243 steps down an input voltage from 2.7 V to 5.5 V to a dynamically adjustable output voltage of 0.4 V to 3.6 V. The output voltage is set through a VCON analog input that adjusts the output voltage to ensure efficient operation at all power levels of the RF PA.

The LM3243 operates in constant frequency PWM mode producing a small and predictable amount of output voltage ripple. This enables best ECTEL power requirements in GMSK and EDGE spectral compliance, with the minimal amount of filtering and excess headroom. When operating in PFM mode, the LM3243 enables the lowest DG09 current consumption and therefore maximizes system efficiency.

The LM3243 has a unique ctive urrent assist and analog ypass (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 to 1.4 A (typical) while still driving a 2.5-A load. The ACB also enables operation with minimal dropout voltage. When considering using the LM3243 in a system design, see the Layout section of this data sheet.

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Technical documentation

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Type Title Date
* Datasheet LM3243 High-Current Step-Down Converter for 2G, 3G, and 4G RF Power Amplifiers datasheet (Rev. C) Aug. 28, 2015
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guide AN-2105 LM3243 DSBGA Evaluation Board (Rev. AP) Mar. 03, 2013

Design & development

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Hardware development

EVALUATION BOARD Download
49
Description

The LM3243 is a DC-DC converter optimized for powering multi-mode 2G/3G/4G RF power amplifiers (PAs) from a single Lithium-Ion cell. The LM3243 steps down an input voltage from 2.7V to 5.5V to a dynamically adjustable output voltage of 0.4V to 3.6V. The output voltage is set through a VCON analog (...)

Features
  • High-Efficiency PFM and PWM modes with Internal Synchronous Rectification
  • Analog Bypass Function with Low Dropout Resistance (45 mΩ typ.)
  • Dynamically Adjustable Output Voltage, 0.4V to 3.6V (typ.), in PFM and PWM modes
  • 2.5A Maximum Load Current in PWM Mode
  • 2.7 MHz (average) PWM Switching Frequency
  • (...)

Design tools & simulation

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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) 16 View options

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