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LM3218 датащи(PDF) 11 Page - National Semiconductor (TI) |
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LM3218 датащи(HTML) 11 Page - National Semiconductor (TI) |
11 / 16 page Block Diagram 30050404 FIGURE 2. Functional Block Diagram Operation Description The LM3218 is a simple, step-down DC-DC converter with a 2.6 µH series inductor substrate optimized for powering RF power amplifiers (PAs) in mobile phones, portable communi- cators, and similar battery powered 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 current mode buck architecture, with syn- chronous rectification for high efficiency. It is designed for a maximum load capability of 650 mA when V OUT > 1.05V (typ.) and 400 mA when V OUT < 1.00V (typ.) in PWM mode. Maximum load range may vary from this depending on input voltage, output voltage and the inductor chosen. Efficiency is typically around 95% for a 400 mA load with 3.4V output, 3.9V input. The LM3218 has an R DSON management scheme to increase efficiency when V OUT ≤ 1V. The output voltage is dynamically programmable from 0.8V to 3.6V by adjusting the voltage on the control pin without the need for external feedback resistors. This prolongs battery life by changing the PA supply voltage dynamically depending on its transmitting power. Additional features include current overload protection and thermal overload shutdown. The LM3218 is constructed using a chip-scale 8-pin micro SMD package and a LTCC inductor substrate. This package offers the smallest possible integrated solution footprint for space-critical applications such as cell phones, where board area is an important design consideration. Use of a high switching frequency (2 MHz) reduces the size of external components. As shown in Figure 1, only two external capac- itors are required for implementation. Use of this module requires special design considerations for implementation. (See LTCC Module Package Assembly and Use in the Appli- cations Information section). The board mounting 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.) 11 www.national.com |
Аналогичный номер детали - LM3218 |
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Аналогичное описание - LM3218 |
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