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LM2748 Folha de dados(PDF) 1 Page - National Semiconductor (TI) |
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LM2748 Folha de dados(HTML) 1 Page - National Semiconductor (TI) |
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1 / 23 page  LM2745/8 Synchronous Buck Controller with Pre-bias Startup, and Optional Clock Synchronization General Description The LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit. The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs be- tween component size, cost and efficiency. Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvolt- age detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail. Features n Switching frequency from 50 kHz to 1 MHz n Switching frequency synchronize range 250 kHz to 1 MHz (LM2745 Only) n Startup with a pre-biased output load n Power stage input voltage from 1V to 14V n Control stage input voltage from 3V to 6V n Output voltage adjustable down to 0.6V n Power Good flag and shutdown n Output overvoltage and undervoltage detection n ± 1.5% feedback voltage accuracy over temperature n Low-side adjustable current sensing n Adjustable soft-start n Tracking and sequencing with shutdown and soft start pins n TSSOP-14 package Applications n Down Conversion from 3.3V n Cable Modem, DSL and ADSL n Laser Jet and Ink Jet Printers n Low Voltage Power Modules n DSP, ASIC, Core and I/O Typical Application 20137401 May 2005 © 2005 National Semiconductor Corporation DS201374 www.national.com |
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Descrição semelhante - LM2748 |
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