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LM3207TL bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM3207TL bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 19 page LM3207 650mA Miniature, Adjustable, Step-Down DC-DC Converter for RF Power Amplifiers with Integrated Vref LDO General 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 V CON analog input for controlling power levels and efficiency of the RF PA. The LM3207 also provides a regulated reference voltage(V- ref) required by linear RF power amplifiers through an inte- grated LDO with a nominal output voltage of 2.875V and maximum Iref of 10 mA. The LM3207 is available in a 9-pin lead free micro SMD package. High switching frequency (2MHz) allows use of surface-mount components. Only four small external surface-mount components are required, an inductor and three ceramic capacitors. Features n 2MHz (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 650mA Maximum load capability n High Efficiency (95% Typ at 3.9V IN, 3.4VOUT at 400mA) from internal synchronous rectification n Integrated 2.875V Vref LDO n Regulated LDO Output up to 10mA max n Fast 3uS Vref LDO On/Off Time n 9-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 20165301 FIGURE 1. LM3207 Typical Application August 2006 © 2006 National Semiconductor Corporation DS201653 www.national.com |
Số phần tương tự - LM3207TL |
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Mô tả tương tự - LM3207TL |
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