LM3207 Datasheet | National Semiconductor

Description The LM3207 is a DC-DC converter optimized for powering WCDMA / CDMA RF power amplifiers (PAs) from a single Lithium-Ion cell; however they may be used in many other applications. It steps down an input voltage from 2.7V to 5.5V to a variable output voltage from 0.8V(typ.) to 3.6V(typ.). Output voltage is set using a VCON analog input for controlling power levels and efficiency of the RF PA. The LM3207 also provides a regulated reference voltage (Vref) required by linear RF power amplifiers through an integrated LDO that has a maximum Iref up to 10 m A. See Ordering Information table on page 2 for Voltage Options. The LM3207 is available in a 9-pin lead free micro SMD package. High switching frequency (2MHz) allows use of surfacemount ponents. Only four small external surface-mount ponents are required, an inductor and three ceramic capacitors. Features - 2MHz (typ.) PWM Switching Frequency - Operates from a single Li-Ion cell (2.7V to 5.5V) - Variable Output Voltage (0.8V to 3.6V) - 650m A Maximum load capability - High Efficiency (95% Typ at 3.9VIN, 3.4VOUT at 400m A) from internal synchronous rectification - Integrated Vref LDO - Regulated LDO Output up to 10m A max - Fast 3u S Vref LDO On/Off Time - 9-pin micro SMD Package - Current Overload Protection - Thermal Overload Protection Applications - Cellular Phones - Hand-Held Radios - RF PC Cards - Battery Powered RF Devices Typical Application FIGURE 1. LM3207 Typical Application © 2007 National Semiconductor Corporation 201653 .national. Connection Diagrams Order Information 9- Bump Thin Micro SMD Package, Large Bump NS Package Number TLA09TTA LDO Voltage Option 2.875 Order Number LM3207TL LM3207TLX LM3207TL-2.53 LM3207TLX-2.53 Part Marking (Note) XVS/34 XVS/34 XVS/43 XVS/43 Supplied As 250 units, Tape-and-Reel 3000 units, Tape-and-Reel 250 units, Tape-and-Reel 3000 units, Tape-and-Reel Note: The actual physical placement of the package marking will vary from...