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LM3241

Texas Instruments
Part Number LM3241
Manufacturer Texas Instruments
Description Step-Down DC-DC Converter
Published Mar 14, 2020
Detailed Description Product Folder Order Now Technical Documents Tools & Software Support & Community LM3241 SNOSB38C – JANUARY 2009 – ...
Datasheet PDF File LM3241 PDF File

LM3241
LM3241

Overview
Product Folder Order Now Technical Documents Tools & Software Support & Community LM3241 SNOSB38C – JANUARY 2009 – REVISED NOVEMBER 2017 LM3241 6-MHz, 750-mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers 1 Features •1 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 2 Applications • Battery-Powered 3G and 4G Power Amplifiers • Hand-Held Radios • RF PC Cards • Battery-Powered RF Devices 3 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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