LM3218 Datasheet | National Semiconductor

Description The LM3218 is a DC-DC converter with inductor which is optimized 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 VCON 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 footprint (3mm x 2.5mm x 1.2mm). Fixed-frequency PWM operation 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 ponents. Only two small external surface-mount ponents, two ceramic capacitors, are required. 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 m A Maximum load capability High Efficiency (95% typ. at 3.9 VIN, 3.4 VOUT at 400 m A) 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 FIGURE 1. LM3218 Typical Application © 2009 National Semiconductor Corporation .national. .Data Sheet.in Connection Diagram NS Package Number SE08A Order Information Order Number LM3218SE LM3218SEX Package Marking (Note) XVS SA XVS SA Supplied As 250 units, Tape-and-Reel 3000 units, Tape-and-Reel Note: The actual physical placement of the package marking will vary from part to part. The package...