LM2647MTCX ,Dual Synchronous Buck Regulator Controllerfeaturesn High current N-channel FET driversline feedforward to improve the response to input trans ..
LM2647MTCX ,Dual Synchronous Buck Regulator ControllerElectrical Characteristics), there will be no observable differ-(for both channels) is set by a res ..
LM2647MTCX ,Dual Synchronous Buck Regulator ControllerPin Description (Continued)regulation on both channels must be achieved first. Further,output capac ..
LM26480SQ-AA , Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators
LM26480SQ-AA , Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators
LM26480SQ-AA/NOPB ,Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators 24-WQFN -40 to 85Features– V from:OUTinclude soft start, undervoltage lockout, current– Buck1 : 0.8 V to 2 V at 1.5 ..
LM4924MM ,2 Cell Battery, 40mW Per Channel Output Capacitor-Less (OCL) Stereo Headphone Audio Amplifierfeaturescircuitrythatreducesoutputtransientsn 2-cell 1.5V to 3.6V battery operation(“clicks” and “p ..
LM4924SD ,2 Cell Battery, 40mW Per Channel Output Capacitor-Less (OCL) Stereo Headphone Audio AmplifierGeneral Description Key Specificationsn OCL output powerThe LM4924 is a Output Capacitor-Less (OCL) ..
LM49250RLX/NOPB ,Enhanced Emissions Suppression Stereo Class D Audio Sub-System w/ Ground Referenced Headphone Amp 36-DSBGA -40 to 85Output short circuit and thermal overload protection Connection Diagramprevent the device from bein ..
LM4925SD ,2 Cell, Single Ended Output, 40mW Stereo Headphone Audio AmplifierGeneral Description Key Specificationsn Mono-BTL Output PowerThe unity gain stable LM4925 is both a ..
LM49270SQ , Filterless 2.2W Stereo Class D Audio Subsystem with OCL Headphone Amplifier, 3D Enhancement, and Headphone Sense
LM49270SQ , Filterless 2.2W Stereo Class D Audio Subsystem with OCL Headphone Amplifier, 3D Enhancement, and Headphone Sense
LM2647LQ-LM2647MTC-LM2647MTCX
Dual Synchronous Buck Regulator Controller
LM2647
Dual Synchronous Buck Regulator Controller
General DescriptionThe LM2647is an adjustable 200-500kHz dual channel
voltage-mode controlled high-speed synchronous buck
regulator controller ideally suitedfor battery powered appli-
cations such as laptop and notebook computers. The
LM2647 requires only N-channel FETsfor both the upper
and lower positionsof each synchronous stage.It features
line feedforwardto improvethe responseto input transients. very light loads,the user can choose between the high-
efficiency Pulse-skip modeor the constant frequency
Forced-PWM mode. Lossless current limiting withoutthe use external sense resistorsis made possibleby sensing the
voltage drop acrossthe bottom FET.A unique adaptive duty
cycle clamping techniqueis incorporatedto significantlyre-
duce peak currents under abnormal load conditions. The two
independently programmable outputs switch 180˚ outof
phase (interleaved switching)to reduce the input capacitor
and filter requirements. The input voltage rangeis 5.5Vto
28V whilethe output voltages are adjustable downto 0.6V.
Standard supervisory and control features include Soft-start,
Power Good, output Under-voltage and Over-voltage protec-
tion, Under-voltage Lockout, Soft-shutdown and Enable.
Features Input voltage range from 5.5Vto 28V Synchronous dual-channel Interleaved switching Forced-PWMor Pulse-skip modes Lossless bottom-side FET current sensing Adaptive duty cycle clamping High current N-channel FET drivers Low shutdown supply currents Reference voltage accurateto within ±1.5% Output voltage adjustable downto 0.6V Power Good flag and Chip Enable Under-voltage lockout Over-voltage/Under-voltage protection Soft-start and Soft-shutdown Switching frequency adjustable 200kHz-500kHz
Applications Notebook Chipset Power Supplies Low Output Voltage High-Efficiency Buck Regulators
Typical Application (Channel2in parenthesis)
See Figure16for Expanded ViewApril 2004
LM2647
Dual
Synchronous
Buck
Regulator
Controller
