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LM3241
SNOSB38C – JANUARY 2009 – ...
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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, th...
