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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3242 6-MHz, 750-mA Miniature Adjustable Step-Down DC-DC Converter With Auto Bypass for RF Power Amplifiers datasheet (Rev. E) | PDF | HTML | 27 Aug 2015 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| EVM User's guide | LM3242 DSBGA Evaluation Board (Rev. AY) | 30 Apr 2013 | ||
| Product overview | LM3242 Dynamic Output Voltage DC/DC Converter for 3G/4G RF Power Amplifiers | 30 Jan 2012 |
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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 (...)
| Package | Pins | Download |
|---|---|---|
| DSBGA (YFQ) | 9 | View options |
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