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LM2640 датащи(PDF) 1 Page - National Semiconductor (TI) |
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LM2640 датащи(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM2640 Dual Adjustable Step-Down Switching Power Supply Controller General Description The LM2640 is a dual step-down power supply controller intended for application in notebook personal computers and other battery-powered equipment. Fixed-frequency synchronous drive of logic-level N-channel power MOSFETs is combined with an optional pulse-skipping mode to achieve ultra efficient power conver- sion over a 1000:1 load current range. The pulse-skipping mode can be disabled in favor of fixed-frequency operation regardless of the load current level. High DC gain and current-mode feedback control assure excellent line and load regulation and a wide loop bandwidth for fast response to dynamic loads. An internal oscillator fixes the switching frequency at 200 kHz. Optionally, switching can be synchronized to an external clock running as fast as 400 kHz. An optional soft-start feature limits current surges from the input power supply at start up and provides a simple means of start-up sequencing. Logic-level inputs allow the controllers to be turned ON and OFF separately. Key Specifications n 96% efficient n 5.5 to 30V input range n Dual outputs adjustable from 2.2 to 6V n 0.5% typical load regulation error n 0.002%/V typical line regulation error Features n 200 kHz fixed-frequency switching n Switching synchronization with an external signal up to 400 kHz n Optional pulse-skipping mode n Adjustable secondary feedback n Input undervoltage lockout n Output undervoltage shutdown protection n Output overvoltage shutdown protection n Programmable soft-start (each controller) n 5V, 50 mA linear regulator output n Precision 2.5V reference output n 28-pin TSSOP Applications n Notebook and subnotebook computers n Wireless data terminals n Battery-powered instruments Connection Diagram and Ordering Information 28-Lead TSSOP (MTC) 10014801 Top View Order Number LM2640MTC-ADJ See NS Package Number MTC28 May 2001 © 2001 National Semiconductor Corporation DS100148 www.national.com |
Аналогичный номер детали - LM2640 |
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Аналогичное описание - LM2640 |
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