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LM3205TLX 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM3205TLX 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM3205 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers General Description The LM3205 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 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 V CON analog input for controlling power levels and efficiency of the RF PA. The LM3205 offers superior performance for mobile phones and similar RF PA applications. Fixed-frequency PWM op- eration minimizes RF interference. Shutdown function turns the device off and reduces battery consumption to 0.01 µA (typ.). The LM3205 is available in micro SMD package and LLP package. For all other package options contact your local NSC sales office. 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 Fast Output Voltage Transient (0.8V to 3.6V in 20µs) n 650mA Maximum load capability n High Efficiency (96% Typ at 4.2V IN, 3.4VOUT at 400mA) from internal synchronous rectification n Current Overload Protection n Thermal Overload Protection Packages n 8-Pin microSMD (Lead Free) n 10-Pin LLP Applications n Cellular Phones n Hand-Held Radios n RF PC Cards n Battery Powered RF Devices Typical Application 20158001 FIGURE 1. LM3205 Typical Application January 2006 © 2006 National Semiconductor Corporation DS201580 www.national.com |
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