LM3241 LM3241 PRODUCT BRIEF 6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers Literature Number: SNOSB38 LM3241 PRODUCT BRIEF 6MHz, 750mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers General Description Features 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 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 6MHz (typ.) which minimizes RF interference when driving medium-to-heavy loads. 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 (typ.). The LM3241 is available in a 6-bump lead-free micro SMD package. A high-switching frequency (6MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required. Notice: This document is not a datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor/Texas Instruments sales office or visit http://www.focus.ti.com/ general/docs/dsnsuprt.tsp. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 6MHz (typ.) PWM Switching Frequency Operates from a Single Li-Ion Cell (2.7V to 5.5V) Adjustable Output Voltage (0.6V to 3.4V) 750 mA Maximum Load Capability High Efficiency (95% typ. at 3.9VIN, 3.6VOUT at 500 mA) Automatic ECO/PWM mode change 6-bump micro SMD Package Current Overload Protection Thermal Overload Protection Soft Start Function CIN and COUT are 0402 (1005) case size and 6.3V of ratedvoltage ceramic capacitor ■ Small Chip Inductor in 0805 (2012) case size Applications ■ Battery-Powered 3G/4G RF PAs ■ Hand-Held Radios ■ RF PC Cards Typical Application 30090401 © 2011 National Semiconductor Corporation 300904 www.national.com LM3241 PRODUCT BRIEF October 13, 2011 LM3241 Physical Dimensions inches (millimeters) unless otherwise noted 6-Bump Thin Micro SMD, Large Bump (0.5 mm pitch) X1 = 1.107 mm ± 0.030 mm X2 = 1.488 mm ±0.030 mm X3 = 0.600 mm ±0.075 mm NS Package Number TLA06E1A www.national.com 2 LM3241 Notes 3 www.national.com LM3241 PRODUCT BRIEF Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise® Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise® Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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