High-Efficiency 1.5A LM2655MTCX-ADJ Synchronous Buck Converter 4.5-20V Input 0.6-18V Adjustable Output 95% Efficiency 280kHz Power Good & Enable

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.

INFORMATION

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