60V, 4A Synchronous Step-Down Regulator with Adjustable Rail-to-Rail Output & Wire Drop Compensation

Milpitas, Ca., (PresseBox) - The LTC3649 is a high efficiency, 60V, 4A synchronous buck regulator that incorporates a constant frequency, current mode architecture and programmable output current and output voltage, which are set with a single external resistor. The LTC3649 operates from an input voltage range of 3.1V to 60V and provides an adjustable rail-to-rail output voltage range from 0V to 0.5V below VIN, while delivering up to 4A of continuous output current. Its wide input and output voltage range is ideal for a wide range of test, measurement and industrial applications. The LTC3649’s unique design includes an accurate internally generated 50µA current source on the ISET pin, enabling it to deliver outputs as low as 0V with the use of a single external programming resistor. Furthermore, the LTC3649 offers ±0.8% output voltage accuracy and programmable output current with ±4% accuracy without a sense resistor. Its switching frequency is user programmable from 300kHz to 3MHz, enabling the use of tiny, low cost capacitors and inductors. Combined with a 28-lead 4mm x 5mm QFN or thermally enhanced TSSOP package, the LTC3649 offers a very compact solution footprint.

The LTC3649 uses internal power switches with RDS(ON) of only 100mOhms and 50mOhms to deliver efficiencies as high as 95%. Burst Mode® operation offers high efficiency at light loads, requiring only 440µA of quiescent current. For noise sensitive applications, the LTC3649 can run in forced continuous mode, offering very low output ripple. Additional features include ±4% accurate output current monitoring, a power good voltage monitor, programmable wire drop compensation, external synchronization capability and thermal protection.

The LTC3649EUFD is available in a 4mm x 5mm QFN-28, the LTC3649EFE is offered in a 28-lead, thermally enhanced TSSOP package. Industrial grade versions, the LTC3649IUFD and LTC3649IFE, are guaranteed to operate over the -40°C to 125°C operating junction temperature range. Pricing starts at $5.65 each in 1,000-piece quantities. All versions are available from stock. For more information, visit www.linear.com/product/LTC3649.

Summary of Features: LTC3649

Wide VIN Range: 3.1V to 60V
Wide VOUT Range: 0V to (VIN - 0.5V)
Single Resistor VOUT Programming
Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
95% Efficiency with 12VIN and 5VOUT
Active IQ: 440µA, Shutdown IQ: 15µA
Accurate Current Monitoring (±4%) without Sense Resistor
Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
Accurate Programmable Output Current Limit
Input Voltage Regulation for MPPT Applications
±0.8% Output Voltage Accuracy
Peak Current Mode Operation
Programmable Wire Drop Compensation
Burst Mode® Operation, Forced Continuous Mode
Internal Compensation & Programmable Soft-Start
Overtemperature Protection
Available in Thermally Enhanced 28-Lead 4mm x 5mm QFN & TSSOP Packages

The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.


Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company's products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com.

LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and µModule are registered trademarks and Hot Swap is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.

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