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LM2640

Texas Instruments
Part Number LM2640
Manufacturer Texas Instruments
Description Dual Adjustable Step-Down Switching Power Supply Controller
Published Feb 21, 2020
Detailed Description LM2640 www.ti.com SNVS019B – DECEMBER 1998 – REVISED APRIL 2013 LM2640 Dual Adjustable Step-Down Switching Power Supp...
Datasheet PDF File LM2640 PDF File

LM2640
LM2640

Overview
LM2640 www.
ti.
com SNVS019B – DECEMBER 1998 – REVISED APRIL 2013 LM2640 Dual Adjustable Step-Down Switching Power Supply Controller Check for Samples: LM2640 FEATURES 1 •2 200 kHz Fixed-Frequency Switching • Switching Synchronization with an External Signal up to 400 kHz • Optional Pulse-Skipping Mode • Adjustable Secondary Feedback • Input Undervoltage Lockout • Output Undervoltage Shutdown Protection • Output Overvoltage Shutdown Protection • Programmable Soft-Start (Each Controller) • 5V, 50 mA Linear Regulator Output • Precision 2.
5V Reference Output • 28-Pin Package APPLICATIONS • Notebook and Subnotebook Computers • Wireless Data Terminals • Battery-Powered Instruments KEY SPECIFICATIONS • 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 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 Nchannel power MOSFETs is combined with an optional pulse-skipping mode to achieve ultra efficient power conversion 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.
1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Tex...


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