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LM3204TLX датащи(PDF) 11 Page - National Semiconductor (TI) |
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LM3204TLX датащи(HTML) 11 Page - National Semiconductor (TI) |
11 / 16 page Block Diagram 20138935 Operation Description The LM3204 is a simple, step-down DC-DC converter with a bypass switch, optimized for powering RF power amplifiers (PAs) in mobile phones, portable communicators, 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 synchronous rectifica- tion for high efficiency. It is designed for a maximum load capability of 300mA in PWM mode and 500mA in bypass mode. Maximum load range may vary from this depending on input voltage, output voltage and the inductor chosen. The device has all three of pin-selectable operating modes required for powering RF PAs in mobile phones and other sophisticated portable device with complex power manage- ment needs. Fixed-frequency PWM operation offers regu- lated output at high efficiency while minimizing interference with sensitive IF and data acquisition circuits. Bypass mode (Forced or Automatic) turns on an internal FET bypass switch to power the PA directly from the battery. This helps the RF power amplifier maintain its operating power during low battery conditions by reducing the dropout voltage across the LM3204. Shutdown mode turns the device off and reduces battery consumption to 0.1µA (typ.). DC PWM mode output voltage precision is +/-2% for 3.6V OUT. Efficiency is typically around 96% for a 120mA load with 3.2V output, 3.6V input. PWM mode quiescent current is 0.72mA typ. The output voltage is dynamically program- mable from 0.8V to 3.6V by adjusting the voltage on the control pin (V CON) 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, over voltage protection and thermal shutdown. The LM3204 is constructed using a chip-scale 10-pin micro SMD package. This package offers the smallest possible size, for space-critical applications such as cell phones, where board area is an important design consideration. Use of a high switching frequency (2MHz typ.) reduces the size of external components. As shown in Figure 1, only few exter- nal components are required for implementation. Use of a micro SMD package requires special design considerations for implementation. (See Micro SMD 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 con- troller should set EN low during power-up and other low supply voltage conditions. (See Shutdown Mode in the De- vice Information section.) www.national.com 11 |
Аналогичный номер детали - LM3204TLX |
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Аналогичное описание - LM3204TLX |
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