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LM3218 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3218 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 16 page  January 21, 2009 LM3218 650 mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers General Description The LM3218 is a DC-DC converter with inductor which is op- timized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage in the range from 2.7V to 5.5V to an adjustable output voltage of 0.8V to 3.6V. Output voltage is set by using a V CON analog input to control power levels and efficiency of the RF PA. The LM3218 offers superior electrical performance for mobile phones and similar RF PA applications with a reduced foot- print (3mm x 2.5mm x 1.2mm). Fixed-frequency PWM oper- ation minimizes RF interference. A shutdown function turns the device off and reduces battery consumption to 0.01 µA (typ.). The LM3218 is available in an integrated inductor 8–pin LTCC package. A high switching frequency (2 MHz typ.) allows use of tiny surface-mount components. Only two small external surface-mount components, two ceramic capacitors, are re- quired. The overall board space is reduced up to 25% from the typical discrete inductor solution. Features ■ Includes 2.6 µH Inductor in very small form factor (3mm x 2.5mm x 1.2mm) ■ 2 MHz (typ.) PWM Switching Frequency ■ Operates from a single Li-Ion cell (2.7V to 5.5V) ■ Adjustable Output Voltage (0.8V to 3.6V) ■ Fast Output Voltage Transient (0.8V to 3.4V in 25 µs typ.) ■ 650 mA Maximum load capability ■ High Efficiency (95% typ. at 3.9 V IN, 3.4 VOUT at 400 mA) ■ 8-pin LTCC Package ■ Current Overload Protection ■ Thermal Overload Protection Applications ■ Cellular Phones ■ Hand-Held Radios ■ RF PC Cards ■ Battery-Powered RF Devices Typical Application 30050401 FIGURE 1. LM3218 Typical Application © 2009 National Semiconductor Corporation 300504 www.national.com |
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