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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) 1 Switching frequency (Min) (kHz) 5700 Switching frequency (Max) (kHz) 6300 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) 9 0 mm² 1.52 x 1.395 open-in-new Find other Buck converters (integrated switch)

Features

  • 2.7-V to 5.5-V Input Voltage Operating From
    Single Li-Ion Cell
  • 6-MHz (typical) PWM Switching Frequency
  • 0.4-V to 3.6-V Adjustable Output Voltage
  • 750-mA Maximum Load Capability
    (up to 1 A in Bypass)
  • High Efficiency (95% typical at 3.9 VIN,
    3.3 VOUT at 500 mA)
  • Automatic ECO/PWM/BP Mode Change
  • Current Overload Protection
  • Thermal Overload Protection
  • Soft-Start Function
  • Small Chip Inductor in 0805 (2012) case size
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Description

The LM3242 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 2.7 V to 5.5 V to an adjustable output voltage from 0.4 V to 3.6 V. Output voltage is set using a VCON analog input for controlling power levels and efficiency of the RF PA.

The LM3242 offers five 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, 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). In low-battery condition Bypass mode reduces the voltage dropout to less than 50 mV (typical). The part also features a Sleep mode.

The LM3242 is available in a 9-bump lead-free DSBGA package. A high switching frequency (6 MHz) allows use of only three tiny surface-mount components: one inductor and two ceramic capacitors.

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Technical documentation

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Type Title Date
* Datasheet LM3242 6-MHz, 750-mA Miniature Adjustable Step-Down DC-DC Converter With Auto Bypass for RF Power Amplifiers datasheet (Rev. E) Aug. 27, 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 LM3242 DSBGA Evaluation Board (Rev. AY) Apr. 30, 2013
More literature LM3242 Dynamic Output Voltage DC/DC Converter for 3G/4G RF Power Amplifiers Jan. 30, 2012

Design & development

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Hardware development

EVALUATION BOARD Download
49
Description

The LM3242 is a DC-DC converter optimized for powering multi-mode 3G/4G RF power amplifiers (PAs) from a single Lithium-Ion cell. The LM3242 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 input (...)

Features
  • 6MHz (typ.) PWM Switching Frequency
  • Operates from a Single Li-Ion Cell (2.7V to 5.5V)
  • Adjustable Output Voltage (0.4V to 3.6V)
  • 750 mA Maximum Load Capability (up to 1A in Bypass)
  • High Efficiency (95% typ. at 3.9VIN, 3.3VOUT at 500 mA)
  • Automatic ECO/PWM/BP mode change
  • 9-bump DSBGA Package
  • Current Overload (...)

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) 9 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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