LM2640MTC-ADJ ,Dual Adjustable Step-Down Switching Power Supply ControllerFeaturesmode can be disabled in favor of fixed-frequency operationn 200 kHz fixed-frequency switchi ..
LM2640MTCX-ADJ ,Dual Adjustable Step-Down Switching Power Supply ControllerGeneral Description Key Specificationsn 96% efficientThe LM2640 is a dual step-down power supply co ..
LM2641MTC-ADJ ,Dual Adjustable Step-Down Switching Power Supply ControllerFeaturesmode can be disabled in favor of fixed-frequency operationn 300 kHz fixed-frequency switchi ..
LM2641MTCX-ADJ ,Dual Adjustable Step-Down Switching Power Supply ControllerGeneral Description Key Specificationsn 96% efficientThe LM2641 is a dual step-down power supply co ..
LM26420XMH , Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator
LM26420YSQ/NOPB ,Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator 16-WQFN -40 to 125Features 2 Applications1• Qualified for Automotive Applications • Local 5 V to Vcore of FPGAs• AEC ..
LM4911MM ,LM4911 Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL OutputLM4911 Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled orOCL OutputFeb ..
LM4911MMX ,LM4911 Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL OutputGeneral Description Key Specificationsn PSRR at 217Hz and 1kHz 65dB (typ)The LM4911 is an stereo au ..
LM4911MMX ,LM4911 Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL OutputFeaturesThe LM4911
LM49120TLX , Audio Sub-System with Mono Class AB Loudspeaker Amplifier and Stereo OCL/SE Headphone Amplifier
LM4912MM ,LM4912 Stereo 40mW Low Noise Headphone AmplifierApplicationsn Portable CD playersn PDAsn Portable electronics devicesTypical Application20048180FIG ..
LM4912MMX ,LM4912 Stereo 40mW Low Noise Headphone AmplifierGeneral Description Key Specificationsn PSRR at 217 Hz and 1kHz 65dB (typ)The LM4912 is an stereo a ..
LM2640MTC-ADJ-LM2640MTCX-ADJ
Dual Adjustable Step-Down Switching Power Supply Controller
LM2640
Dual Adjustable Step-Down Switching Power Supply
Controller
General DescriptionThe LM2640isa dual step-down power supply controller
intendedfor applicationin notebook personal computers and
other battery-powered equipment.
Fixed-frequency synchronous driveof logic-level N-channel
power MOSFETs is combined with an optional
pulse-skipping modeto achieve ultra efficient power conver-
sion overa 1000:1 load current range. The pulse-skipping
mode canbe disabledin favorof fixed-frequency operation
regardlessofthe load current level.
High DC gain and current-mode feedback control assure
excellent line and load regulation anda wide loop bandwidth
for fast responseto dynamic loads. internal oscillator fixes the switching frequencyat
200 kHz. Optionally, switching canbe synchronizedtoan
external clock runningas fastas 400 kHz. optional soft-start feature limits current surges from the
input power supplyat startup and providesa simple means start-up sequencing.
Logic-level inputs allowthe controllerstobe turned ON and
OFF separately.
Key Specifications 96% efficient 5.5to 30V input range Dual outputs adjustable from 2.2to6V 0.5% typical load regulation error 0.002%/V typical line regulation error
Features 200 kHz fixed-frequency switching Switching synchronization withan external signalupto
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 TSSOP
Applications Notebook and subnotebook computers Wireless data terminals Battery-powered instruments
Connection Diagram and Ordering Information
28-Lead TSSOP (MTC)Top View
Order Number LM2640MTC-ADJ
See NS Package Number MTC28
May 2001
LM2640
Dual
Adjustable
Step-Down
Switching
Power
Supply
Controller
