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LM26 bảng dữ liệu(PDF) 8 Page - National Semiconductor (TI) |
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LM26 bảng dữ liệu(HTML) 8 Page - National Semiconductor (TI) |
8 / 16 page Typical Performance Characteristics LM2614ATL, Circuit of Figure 4,VIN = 3.6V, TA = 25˚C, unless otherwise noted. (Continued) Efficiency vs Output Voltage (PWM MODE, with Diode) 20036730 Device Information The LM2614 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 LiION battery cell. It is based on a current-mode buck architecture, with synchronous rectifica- tion in PWM mode for high efficiency. It is designed for a maximum load capability of 400mA (300mA for B grade) in PWM mode. Maximum load range may vary from this de- pending on input voltage, output voltage and the inductor chosen. The device has all three of the pin-selectable operating modes required for powering RF PAs in mobile phones and other sophisticated portable devices with complex power management needs. Fixed-frequency PWM operation offers full output current capability at high efficiency while minimiz- ing interference with sensitive IF and data acquisition cir- cuits. During standby operation, hysteretic PFM mode re- duces quiescent current to 160µA typ. to maximize battery life. Shutdown mode turns the device off and reduces battery consumption to 0.02µA (typ). DC PWM mode feedback voltage precision is ±1%. Effi- ciency is typically 96% for a 200mA load with 3.6V output, 3.9V input. The efficiency can be further increased by using a schottky diode like MBRM120 as shown in Figure 4. PWM mode quiescent current is 600µA typ. The output voltage is dynamically programmable from 1.0V to 3.6V by adjusting the voltage on the VCON at the 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 soft-start, current overload pro- tection, over voltage protection and thermal shutdown pro- tection. The LM2614 is constructed using a chip-scale 10-pin thin micro SMD package. This package offers the smallest pos- sible size, for space-critical applications such as cell phones, where board area is an important design consideration. Use of a high switching frequency (600kHz) reduces the size of external components. Board area required for implementa- tion is only 0.58in 2 (375mm2). Use of a micro-SMD package requires special design con- siderations for implementation. (See Micro SMD Package Assembly and Use in the Application Information section.) Its fine bump-pitch requires careful board design and precision assembly equipment. www.national.com 8 |
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Mô tả tương tự - LM26 |
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