LM2655 Series

2.5A High Efficiency Synchronous Switching Regulator

Catalog

2.5A High Efficiency Synchronous Switching Regulator

Part	Voltage - Input (Max) [Max]	Mounting Type	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Current - Output	Frequency - Switching	Output Type	Voltage - Input (Min) [Min]	Package / Case [x]	Package / Case	Package / Case [y]	Number of Outputs	Voltage - Output (Min/Fixed)	Function	Topology	Output Type	Voltage - Output (Max) [Max]
Texas Instruments LM2655MTCX-3.3/NOPB	14 V	Surface Mount	Positive	-40 °C	125 ¯C	16-TSSOP	2.5 A	300 kHz	1.81 mOhm	4 V	0.173 in	16-TSSOP	4.4 mm	1	3.3 V	Step-Down	Buck
Texas Instruments LM2655MTC-3.3	14 V	Surface Mount	Positive	-40 °C	125 ¯C	16-TSSOP	2.5 A	300 kHz	1.81 mOhm	4 V	0.173 in	16-TSSOP	4.4 mm	1	3.3 V	Step-Down	Buck
Texas Instruments LM2655MTCX-ADJ	14 V	Surface Mount	Positive	-40 °C	125 ¯C	16-TSSOP	2.5 A	300 kHz		4 V	0.173 in	16-TSSOP	4.4 mm	1	1.238 V	Step-Down	Buck	Adjustable	13 V
Texas Instruments LM2655MTC-3.3/NOPB	14 V	Surface Mount	Positive	-40 °C	125 ¯C	16-TSSOP	2.5 A	300 kHz	1.81 mOhm	4 V	0.173 in	16-TSSOP	4.4 mm	1	3.3 V	Step-Down	Buck
Texas Instruments LM2655MTC-ADJ/NOPB	14 V	Surface Mount	Positive	-40 °C	125 ¯C	16-TSSOP	2.5 A	300 kHz		4 V	0.173 in	16-TSSOP	4.4 mm	1	1.238 V	Step-Down	Buck	Adjustable	13 V

Catalog

2.5A High Efficiency Synchronous Switching Regulator

Key Features

• Ultra-high efficiency up to 96%4V to 14V input voltage rangeInternal high-side MOSFET with low RDS(ON)= 0.033300 kHz fixed frequency internal oscillatorLow-side drive for synchronous operationGuaranteed less than 12 µA shutdown currentPatented current sensing for current mode controlProgrammable soft-startInput undervoltage lockoutOutput overvoltage shutdown protectionOutput undervoltage shutdown protectionThermal Shutdown16-pin TSSOP packageUltra-high efficiency up to 96%4V to 14V input voltage rangeInternal high-side MOSFET with low RDS(ON)= 0.033300 kHz fixed frequency internal oscillatorLow-side drive for synchronous operationGuaranteed less than 12 µA shutdown currentPatented current sensing for current mode controlProgrammable soft-startInput undervoltage lockoutOutput overvoltage shutdown protectionOutput undervoltage shutdown protectionThermal Shutdown16-pin TSSOP package

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 (33m) 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 IC 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 start up current surges and provides a means of sequencing multiple power supplies. 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 (33m) 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 IC 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 start up current surges and provides a means of sequencing multiple power supplies.