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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3205SD-2 Datenblatt(PDF) 11 Page - National Semiconductor (TI) |
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LM3205SD-2 Datenblatt(HTML) 11 Page - National Semiconductor (TI) |
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11 / 18 page  Block Diagram Operation Description The LM3205 is a simple, step-down DC-DC converter opti- mized for powering RF power amplifiers (PAs) in mobile phones, portable communicators, and similar battery pow- ered RF devices. It is designed to allow the RF PA to operate at maximum efficiency over a wide range of power levels from a single Li-Ion battery cell. It is based on a current- mode buck architecture, with synchronous rectification for high efficiency. It is designed for a maximum load capability of 650mA in PWM mode. Maximum load range may vary from this depending on input voltage, output voltage and the inductor chosen. Efficiency is typically around 96% for a 400mA load with 3.4V output, 4.2V input. The output voltage is dynamically pro- grammable from 0.8V (typ.) to 3.6V (typ.) by adjusting the voltage on the control pin without the need for external feedback resistors. This ensures longer battery life by being able to change the PA supply voltage dynamically depending on its transmitting power. Additional features include current overload protection and thermal overload shutdown. The LM3205 is constructed using a chip-scale 8-pin mi- croSMD or 10-pin LLP package. These packages offers the smallest possible size, for space-critical applications such as cell phones, where board area is an important design con- sideration. Use of a high switching frequency (2MHz) re- duces the size of external components. As shown in Figure 1, only three external power components are required for implementation. Use of a microSMD package requires spe- cial design considerations for implementation. (See mi- croSMD Package Assembly and use in the Applications Information section.) Its fine bump-pitch requires careful board design and precision assembly equipment. Use of this package is best suited for opaque-case applications, where its edges are not subject to high-intensity ambient red or infrared light. Also, the system controller should set EN low during power-up and other low supply voltage conditions. (See Shutdown Mode in the Device Information section.) 20158035 FIGURE 2. Functional Block Diagram www.national.com 11 |
Ähnliche Teilenummer - LM3205SD-2 |
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Ähnliche Beschreibung - LM3205SD-2 |
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