LM2650M-ADJ ,Synchronous Step-Down DC/DC ConverterBlock Diagrams)Pins Description1, 12 SUB: These pins make electrical contact with the substrate of ..
LM2650M-ADJ/NOPB ,Synchronous Step-Down DC/DC Converter 24-SOIC -40 to 125 SNVS133C –JUNE 1999–REVISED APRIL 2013(1)PIN DESCRIPTIONSPins Description1, 12 SUB: These pins mak ..
LM2650MX-ADJ ,Synchronous Step-Down DC/DC ConverterApplicationsthresholds. The LM2650 provides nodes for programmingboth thresholds via external resis ..
LM2651MTC-1.8 ,1.5A High Efficiency Switching RegulatorLM2651 1.5A High Efficiency Synchronous Switching RegulatorMarch 2001LM26511.5A High Efficiency Syn ..
LM2651MTC-2.5 ,1.5A High Efficiency Switching RegulatorFeaturesn Ultra high efficiency up to 97%The LM2651 switching regulator provides high efficiencypow ..
LM2651MTC-3.3 ,1.5A High Efficiency Switching RegulatorLM2651 1.5A High Efficiency Synchronous Switching RegulatorMarch 2001LM26511.5A High Efficiency Syn ..
LM4927SD , 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown
LM4927SD/NOPB ,2.5 Watt Fully Differential Audio Power Amplifier With Shutdown 8-WSON Electrical Characteristics V = 5VDDThe following specifications apply for V = 5V, A = 1, and 8Ω loa ..
LM4928SD , 1.2 Watt Stereo Fully Differential Audio Amplifier with RF Suppression and Shutdown Low
LM4929MM ,LM4929 Stereo 40mW Low Noise Headphone Amplifier with OCL OutputGeneral Description Key SpecificationsThe LM4929 is an stereo audio power amplifier capable ofj PSR ..
LM4929MMX ,LM4929 Stereo 40mW Low Noise Headphone Amplifier with OCL OutputBlock Diagram®Boomer is a registered trademark of National Semiconductor Corporation. 2004 National ..
LM4930ITL ,Audio Subsystem with Stereo Headphone & Mono Speaker AmplifiersFeaturesTheLM4930employsadvancedtechniquestoreducepowern 16-bit resolution 48kHz stereo DACconsumpt ..
LM2650M-ADJ-LM2650MX-ADJ
Synchronous Step-Down DC/DC Converter
LM2650
Synchronous Step-Down DC/DC Converter
General DescriptionThe LM2650isa step-down DC/DC converter featuring high
efficiency overa3Ato milliamperes load range. This feature
makesthe LM2650an idealfitin battery-powered applica-
tions that demand long batterylifein both run and standby
modes.
The LM2650 also featuresa logic-controlled shutdown mode whichit drawsat most 25μA fromthe input power supply.
The LM2650 employsa fixed-frequency pulse-width modu-
lation (PWM) and synchronous rectificationto achieve very
high efficiencies.In many applications, efficiencies reach
95%+for loads around1A and exceed 90%for moderateto
heavy loads from 0.2Ato 2A. low-power hystereticor ″sleep″ mode keeps efficiencies
highat light loads. The LM2650 enters and exits sleep mode
automaticallyasthe load crosses ″sleepin″ and ″sleep out″
thresholds. The LM2650 provides nodesfor programming
both thresholdsvia external resistors.Alogic input allowsthe
userto override the automatic sleep feature and keep the
LM2650in PWM mode regardlessof the load level. optional soft-start feature limits current surges from the
input power supplyat startup and providesa simple means sequencing multiple power supplies.
Features Ultra high efficiencies (95% possible) High efficiency overa3Ato milliamperes load range Synchronous switchingof internal NMOS power FETs Wide input voltage range (4.5Vto 18V) Output voltage adjustable from 1.5Vto 16V Automatic low-power sleep mode Logic-controlled micropower shutdown (IQSD≤25 μA) Frequency adjustableupto 300 kHz Frequency synchronization with external signal Programmable soft-start Short-circuit current limiting Thermal shutdown Availablein 24-lead Small-Outline package
Applications Notebook and palmtop personal computers Portable data terminals Modems Portable Instruments Global positioning devices (GPSs) Battery-powered digital devices
Typical ApplicationDS012848-1
Convertinga Four-CellLi Ion Batteryto5V
LM2650-ADJ EfficiencyDS012848-2
November 2000
LM2650
Synchronous
Step-Down
DC/DC
Converter
