LM2655MTCX-ADJ ,2.5A High Efficiency Synchronous Switching RegulatorBlock Diagram10128404 2LM2655LM2655
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LM2655MTC-3.3-LM2655MTC-ADJ-LM2655MTCX-3.3-LM2655MTCX-ADJ
2.5A High Efficiency Synchronous Switching Regulator
LM2655
2.5A High Efficiency Synchronous Switching Regulator
General DescriptionThe LM2655isa current-mode controlled PWM step-down
switching regulator.It has the unique abilityto operatein
synchronous or asynchronous mode. This gives the
designer flexibilityto choose between the high efficiencyof
synchronous operation, or the low solution cost of
asynchronous operation. Along with flexibility, the LM2655
offers high power density with the small footprintofa
TSSOP-16 package.
High efficiency (>90%)is obtained through the useofan
internal low ON-resistance (33mΩ) MOSFET, and an
external N-Channel MOSFET. This feature, together withits
low quiescent current, makes the LM2655an idealfitin
portable applications.
Integratedinthe LM2655areallthe power, control, and drive
functionsfor asynchronous operation.In addition,a low-side
driver output allows easy synchronous operation. TheIC
uses patented current sensing circuitry that eliminates the
external current sensing resistor required by other
current-mode DC-DC converters.A programmable soft-start
feature limits startup current surges and providesa means sequencing multiple power supplies.
Features Ultra-high efficiencyupto 96%4Vto 14V input voltage range Internal high-side MOSFET with low RDS(ON)= 0.033Ω 300 kHz fixed frequency internal oscillator Low-side drivefor synchronous operation Guaranteed less than12μA shutdown current Patented current sensingfor current mode control Programmable soft-start Input undervoltage lockout Output overvoltage shutdown protection Output undervoltage shutdown protection Thermal Shutdown 16-pin TSSOP package
Applications Hard disk drives Internet appliances TFT monitors Computer peripherals Battery powered devices
Typical ApplicationMarch 2001
LM2655
2.5A
High
Efficiency
Synchronous
Switching
Regulator
