LM2647LQ/NOPB ,Dual Synchronous Buck Regulator Controller 28-WQFN -5 to 125Electrical Characteristics table)SS_DCHGbetween this pin and ground to discharge any remaining char ..
LM2647MTC ,Dual Synchronous Buck Regulator ControllerElectrical Characteristics table) between this pin and groundage on the Feedback pin with appropria ..
LM2647MTC ,Dual Synchronous Buck Regulator Controllerfeatures include Soft-start,n Low Output Voltage High-Efficiency Buck RegulatorsPowerGood,outputUnd ..
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 ..
LM4923LQX ,1.1 Watt Fully Differential Audio Power Amplifier With Shutdown Selectfeatures an internal thermaln No output coupling capacitors, snubber networks orshutdown protection ..
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
LM2647LQ/NOPB
Dual Synchronous Buck Regulator Controller
LM2647
www.ti.com SNVS210F–JUNE 2003–REVISED APRIL 2013
LM2647 Dual Synchronous Buck Regulator Controller
Checkfor Samples: LM2647
1FEATURES DESCRIPTIONThe LM2647 is an adjustable 200-500kHz dual
Input Voltage Range from 5.5Vto 28V channel voltage-mode controlled high-speed
• Synchronous Dual-channel Interleaved synchronous buck regulator controller ideally suited
Switching for battery powered applications such as laptop and
Forced-PWMor Pulse-skip Modes notebook computers. The LM2647 requires only N-
channel FETs for both the upper and lower positions
• Lossless Bottom-side FET Current Sensing of each synchronous stage. It features line
• Adaptive Duty Cycle Clamping feedforward to improve the response to input
High Current N-channel FET Drivers transients.At very light loads, the user can choose
between the high-efficiency Pulse-skip modeor the
• Low Shutdown Supply Currents constant frequency Forced-PWM mode. Lossless
• Reference Voltage Accurateto Within ±1.5% current limiting without the use of external sense
• Output Voltage Adjustable downto 0.6V resistorsis made possible by sensing the voltage
drop across the bottom FET.A unique adaptive duty
• Power Good flag and Chip Enable cycle clamping technique is incorporated to
• Under-voltage Lockout significantly reduce peak currents under abnormal
• Over-voltage/Under-voltage Protection load conditions. The two independently
programmable outputs switch 180° out of phase
• Soft-start and Soft-shutdown(interleaved switching)to reduce the input capacitor
• Switching Frequency Adjustable 200kHz- and filter requirements. The input voltage rangeis
500kHz 5.5Vto 28V while the output voltages are adjustable
downto 0.6V.
APPLICATIONSStandard supervisory and control features include
• Notebook Chipset Power Supplies Soft-start, Power Good, output Under-voltage and
Low Output Voltage High-Efficiency Buck Over-voltage protection, Under-voltage Lockout, Soft-
Regulators shutdown and Enable.
