LM3208 Datasheet | National Semiconductor

Description The LM3208 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 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 LM3208 offers superior performance for mobile phones and similar RF PA applications. Fixed-frequency PWM operation minimizes RF interference. A shutdown function turns the device off and reduces battery consumption to 0.01 µA (typ.). The LM3208 is available in an 8-pin lead-free micro SMD package. A high switching frequency (2 MHz typ.) allows use of tiny surface-mount ponents. Only three small external surface-mount ponents, an inductor and two ceramic capacitors, are required. Features n n n n n n n n n 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 25µs typ.) 650m A Maximum load capability High Efficiency (95% typ. at 3.9VIN, 3.4VOUT at 400m A) 8-pin micro SMD Package Current Overload Protection Thermal Overload Protection Applications n n n n Cellular Phones Hand-Held Radios RF PC Cards Battery Powered RF Devices Typical Application FIGURE 1. LM3208 Typical Application © 2006 National Semiconductor Corporation DS201663 .national. Connection Diagrams 8- Bump Thin Micro SMD Package, Large Bump NS Package Number TLA08GNA Order Information Order Number LM3208TL LM3208TLX Package Marking (Note) XVS/33 XVS/33 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 marking “X” designates the date code. “V” is a NSC internal code for die traceability. Both will vary in production. “S” designates device type as...