High-Efficiency 1.5A LM2655MTCX-ADJ Synchronous Buck Converter 4.5-20V Input 0.6-18V Adjustable Output 95% Efficiency 280kHz Power Good & Enable
Features
Ultra-high efficiency up to 96%
4V to 14V input voltage range
Internal high-side MOSFET with low Rps(oN)= 0.033Ω
300 kHz fixed frequency internal oscillator
Low-side drive for synchronous operation
Guaranteed less than 12 uA shutdown current
Patented current sensing for current mode control
Programmable soft-start
Input undervoltage lockout
Output overvoltage shutdown protection
Output undervoltage shutdown protection0
Thermal Shutdown
16-pin TSSOP package
Applications
Hard disk drives
Internet appliances
TFT monitors
Computer peripherals
Battery powered devices
Description
The LM2655 is a current-mode controlled PWM step-down switching regulator. it has the unique ability to operate in synchronous or asynchronous mode. This gives the designer flexibility to choose between the high efficiency of synchronous operation, or the low solution cost of asynchronous operation. Along with flexibility, the LM2655 offers high power density with the small footprint of a TSSOP-16 package.
High efficiency (>90%)is obtained through the use of an internal low ON-resistance (33mΩ) MOSFET, and an external N-Channel MOSFET. This feature, together with its low quiescent current, makes the LM2655 an ideal fit in portable applications.
Integrated in the LM2655 are all the power, control, and drive functions for asynchronous operation. In addition, a low-side driver output allows easy synchronous operation. The lC uses patented current sensing circuitry that eliminates the external current sensing resistor required by other currentmode DC-DC converters.A programmable soft-start feature limits start up current surges and provides a means of sequencing multiple power supplies.
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Drawing
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High-Efficiency 1.5A LM2655MTCX-ADJ Synchronous Buck Converter 4.5-20V Input 0.6-18V Adjustable Output 95% Efficiency 280kHz Power Good & Enable Images
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