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LM2641MTC-ADJ-LM2641MTCX-ADJ
Dual Adjustable Step-Down Switching Power Supply Controller
LM2641
Dual Adjustable Step-Down Switching Power Supply
Controller
General DescriptionThe LM2641isa 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
300 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 2.2to8V 0.5% typical load regulation error 0.002%/V typical line regulation error
Features 300 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 LM2641MTC-ADJ
See NS Package Number MTC28
May 2001
LM2641
Dual
Adjustable
Step-Down
Switching
Power
Supply
Controller
