LM3241

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6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers

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Product details

Parameters

Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) 0.6 Vout (Max) (V) 3.4 Iout (Max) (A) 0.75 Switching frequency (Min) (kHz) 5700 Switching frequency (Max) (kHz) 6300 Features Fixed Output Operating temperature range (C) -40 to 85 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

DSBGA (YZR) 6 2 mm² 1.52 x 1.13 open-in-new Find other Buck converters (integrated switch)

Features

  • 6-MHz (typ.) PWM Switching Frequency
  • Operates from a Single Li-Ion Cell (2.7 V to 5.5 V)
  • Adjustable Output Voltage (0.6 V to 3.4 V)
  • 750-mA Maximum Load Capability
  • High Efficiency (95% typ. at 3.9 VIN, 3.3 VOUT at 500 mA)
  • Automatic Eco-mode™ and PWM Mode Change
  • 6-Bump DSBGA Package
  • Current Overload Protection
  • Thermal Overload Protection
  • Soft Start Function
  • CIN and COUT are 0402 (1005) Case Size and 6.3 V of Rated-Voltage Ceramic Capacitor
  • Small Chip Inductor in 0805 (2012) Case Size

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Description

The LM3241 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. The device can also be used in many other applications. The device steps down an input voltage from 2.7 V to 5.5 V to an adjustable output voltage from 0.6 V to 3.4 V. The output voltage is set using a VCON analog input for controlling power levels and efficiency of the RF PA.

The LM3241 offers three modes of operation. In PWM mode the device operates at a fixed frequency of 6 MHz (typical) which minimizes RF interference when driving medium-to-heavy loads. At light-load conditions, the device enters into Eco-mode automatically and operates with reduced switching frequency. In Eco-mode, the quiescent current is reduced and extends the battery life. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typical).

The LM3241 is available in a 6-bump lead-free DSBGA package. A high-switching frequency (6 MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required.

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Technical documentation

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Type Title Date
* Datasheet LM3241 6-MHz, 750-mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers datasheet (Rev. C) Nov. 01, 2017
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

Design & development

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Hardware development

EVALUATION BOARD Download
49
Description

The LM3241 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell; however, it may be used in many other applications. It steps down an input voltage from 2.7V to 5.5V to an adjustable output voltage from 0.6V to 3.4V. Output voltage is set using a VCON (...)

Features
  • 6MHz (typ.) PWM Switching Frequency
  • Operates from a Single Li-Ion Cell (2.7V to 5.5V)
  • Adjustable Output Voltage VOUT = 2.5 x VCON (0.6V to 3.4V)
  • 750 mA Maximum Load Capability
  • Automatic ECO/PWM mode change

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 (YZR) 6 View options

Ordering & quality

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