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LM2640 bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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LM2640 bảng dữ liệu(HTML) 1 Page - Texas Instruments |
1 / 29 page LM2640 www.ti.com SNVS019B – DECEMBER 1998 – REVISED APRIL 2013 LM2640 Dual Adjustable Step-Down Switching Power Supply Controller Check for Samples: LM2640 1 FEATURES DESCRIPTION The LM2640 is a dual step-down power supply 2 • 200 kHz Fixed-Frequency Switching controller intended for application in notebook • Switching Synchronization with an External personal computers and other battery-powered Signal up to 400 kHz equipment. • Optional Pulse-Skipping Mode Fixed-frequency synchronous drive of logic-level N- • Adjustable Secondary Feedback channel power MOSFETs is combined with an optional pulse-skipping mode to achieve ultra efficient • Input Undervoltage Lockout power conversion over a 1000:1 load current range. • Output Undervoltage Shutdown Protection The pulse-skipping mode can be disabled in favor of • Output Overvoltage Shutdown Protection fixed-frequency operation regardless of the load • Programmable Soft-Start (Each Controller) current level. • 5V, 50 mA Linear Regulator Output High DC gain and current-mode feedback control assure excellent line and load regulation and a wide • Precision 2.5V Reference Output loop bandwidth for fast response to dynamic loads. • 28-Pin Package An internal oscillator fixes the switching frequency at APPLICATIONS 200 kHz. Optionally, switching can be synchronized to an external clock running as fast as 400 kHz. • Notebook and Subnotebook Computers An optional soft-start feature limits current surges • Wireless Data Terminals from the input power supply at start up and provides • Battery-Powered Instruments a simple means of start-up sequencing. Logic-level inputs allow the controllers to be turned KEY SPECIFICATIONS ON and OFF separately. • 96% Efficient • 5.5V to 30V Input Range • Dual Outputs Adjustable from 2.2V to 6V • 0.5% Typical Load Regulation Error • 0.002%/V Typical Line Regulation Error 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1998–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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