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LM3200TLX Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3200TLX Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 15 page  LM3200 Miniature, Adjustable, Step-Down DC-DC Converter with Bypass Mode for RF Power Amplifiers General Description The LM3200 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.7V to 5.5V to a variable output voltage of 0.8V to 3.6V. The output voltage is set using an analog input ( V CON) for optimizing efficiency of the RF PA at various power levels. The LM3200 offers superior features and performance 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. LM3200 has both forced and auto- matic bypass modes. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typ.). The LM3200 is available in a 10-pin lead free micro SMD pack- age. A high switching frequency (2 MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required. Features n 2 MHz (typ.) PWM Switching Frequency n Operates from a single Li-Ion cell (2.7V to 5.5V) n Variable Output Voltage (0.8V to 3.6V) n 300 mA Maximum load capability (PWM mode) n 500 mA Maximum load capability (Bypass mode) n PWM, Forced and Automatic Bypass Mode n High Efficiency (96% Typ at 3.6V IN, 3.2VOUT at 120 mA) from internal synchronous rectification n 10-pin micro SMD Package n Current Overload Protection n Thermal Overload Protection Applications n Cellular Phones n Hand-Held Radios n RF PC Cards n Battery Powered RF Devices Typical Application 20126101 November 2005 © 2005 National Semiconductor Corporation DS201261 www.national.com |
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