LM2651MTCX-1.8 ,1.5A High Efficiency Switching RegulatorApplicationsThe LM2651 has a 300 kHz fixed frequency internal oscilla- n Personal digital assistant ..
LM2651MTCX-1.8 ,1.5A High Efficiency Switching RegulatorApplicationsThe LM2651 has a 300 kHz fixed frequency internal oscilla- n Personal digital assistant ..
LM2651MTCX-3.3 ,1.5A High Efficiency Switching Regulatorfeatures include input undervoltage lockout,current limiting, and thermal shutdown.Typical Applicat ..
LM2651MTCX-ADJ ,1.5A High Efficiency Switching Regulatorapplications, the efficiency still exceeds 80% at 15mAn Input undervoltage lockoutload. A shutdown ..
LM2653MTC-ADJ ,1.5A High Efficiency Synchronous Switching RegulatorGeneral Descriptionn 0.1Ω Switch On ResistanceThe LM2653 switching regulator provides high efficien ..
LM2653MTC-ADJ/NOPB ,1.5A High Efficiency Synchronous Switching Regulator 16-TSSOP -40 to 125FEATURES DESCRIPTIONThe LM2653 switching regulator provides high2• Efficiency up to 97%efficient po ..
LM49370RL/NOPB ,Boomer Aud Pwr Amp & Sub-Sys w/ an Ultra Low EMI Sprd Spectrum Class D Loudspkr Amp 49-DSBGA -40 to 85features an SNR of 85 dB with an 18-bit 48 kHz input. In SE mode the headphone amplifier delivers a ..
LM49370RLX/NOPB ,Boomer Aud Pwr Amp & Sub-Sys w/ an Ultra Low EMI Sprd Spectrum Class D Loudspkr Amp 49-DSBGA -40 to 85FEATURES • 16 Step Volume Control for Microphone in 2dB Steps2• Spread Spectrum Class D Architectur ..
LM4938MH ,Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable GainBlock Diagram®Boomer is a registered trademark of NationalSemiconductor Corporation. 2005 National ..
LM4938MHX ,Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable GainGeneral Description Key Specificationsn P at 1% THD+NThe LM4938 is a monolithic integrated circuit ..
LM4938MHX NOPB ,Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain 28-HTSSOP features an externally controlled, low-APPLICATIONSpower consumption shutdown mode, and both apower ..
LM4946SQ , Output Capacitor-Less Audio Subsystem with Programmable National 3D
LM2651MTC-1.8-LM2651MTC-2.5-LM2651MTC-3.3-LM2651MTC-ADJ-LM2651MTCX-1.8-LM2651MTCX-3.3-LM2651MTCX-ADJ
1.5A High Efficiency Switching Regulator
LM2651
1.5A High Efficiency Synchronous Switching Regulator
General DescriptionThe LM2651 switching regulator provides high efficiency
power conversion overa 100:1 load range (1.5Ato 15mA).
This feature makes the LM2651 an ideal fit in
battery-powered applications that demand long batterylifein
both run and standby modes.
Synchronous rectificationis usedto achieveupto 97%
efficiency.At light loads, the LM2651 entersa low power
hystereticor “sleep” modeto keep the efficiency high.In
many applications, the efficiency still exceeds 80%at 15mA
load.A shutdownpinis availableto disablethe LM2651 and
reducethe supply currentto less than 10μA.
The LM2651 containsa patented current sensing circuitryfor
current mode control. This feature eliminates the external
current sensing resistor requiredby other current-mode
DC-DC converters.
The LM2651 hasa 300 kHz fixed frequency internal oscilla-
tor. The high oscillator frequency allowsthe useof extremely
small, low profile components. programmable soft-start feature limits current surges from
the input power supplyat startup and providesa simple
meansof sequencing multiple power supplies.
Other protection features include input undervoltage lockout,
current limiting, and thermal shutdown.
Features Ultra high efficiencyupto 97% High efficiency overa 1.5Ato milliamperes load range4Vto 14V input voltage range 1.8V, 2.5V, 3.3V,or ADJ output voltage Internal MOSFET switch with low RDS(on)of 75mΩ 300kHz fixed frequency internal oscillator 7μA shutdown current Patented current sensingfor current mode control Input undervoltage lockout Adjustable soft-start Current limit and thermal shutdown 16-pin TSSOP package
Applications Personal digital assistants (PDAs) Computer peripherals Battery-powered devices Handheld scanners High efficiency5V conversion
Typical ApplicationEfficiencyvs Load Current
(VIN= 5V, VOUT= 3.3V
March 2001
LM2651
1.5A
High
Efficiency
Synchronous
Switching
Regulator
