LM3203 Datasheet | National Semiconductor

Description The LM3203 is a DC-DC converter optimized for powering 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 of 2.7V to 5.5V to an adjustable output voltage of 0.8V to 3.6V. The output voltage is set using a VCON analog input and external resistor dividers for optimizing efficiency of the RF PA at various power levels. The LM3203 offers 3 modes for mobile phones and similar RF PA applications. Fixed-frequency PWM mode minimizes RF interference. Bypass mode turns on an internal bypass switch to power the PA directly from the battery. Shutdown mode turns the device off and reduces battery consumption to 0.1µA (typ.). The LM3203 is available in a 10-pin lead free micro SMD package. A high switching frequency (2MHz) allows use of tiny surface-mount ponents. Features n n n n n n n n n n n 2MHz (typ.) PWM Switching Frequency Operates from a single Li-Ion cell (2.7V to 5.5V) Adjustable Output Voltage (0.8V to 3.6V) 500m A Maximum load capability (PWM and Bypass mode) PWM / Forced Bypass Mode Low RDSON Bypass FET: 85mΩ (typ.) High Efficiency (96% typ. at 3.6VIN, 3.2VOUT at 150m A) Fast Turn-on time when Enabled (50µs typ.), 3GPP pliant 10-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 © 2005 National Semiconductor Corporation DS201416 .national. Connection Diagrams .. Top View Bottom View 10- Bump Thin Micro SMD Package, Large Bump See NS Package Number TLP10NHA Order Information Order Number LM3203TL LM3203TLX Package Marking (Note) XYTT SFYB XYTT SFYB Supplied As 250 Units, Tape and Reel 3000 Units, Tape and Reel Note: The package marking “XY” designates the date code. “TT” is a NSC internal code for die traceability. Pin Description Pin # A1 B1 C1 D1 D2 D3 C3 Name VDD VCON FB BYP EN...