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Linear Technology : Dc-dc controller suits step up, step down, invert and SEPIC topologies



Linear Technology Corporation announces a new high reliability (MP) grade version of the LT3724, a 60V (65V(MAX)) low quiescent current (100uA) switching regulator DC/DC controller used in step-down, step-up, inverting and SEPIC topologies. The LT3724MP operates, and is 100% tested, over a junction temperature range of -55°C to 125°C, compared to the “I” grade version's -40°C to 125°C operating temperature range. A power supply incorporating the LT3724 can convert a 4V to 60V input supply to a regulated output ranging from 1.23V to 36V in applications such as industrial, 12V and 42V automotive, heavy equipment, avionics and telecom power systems.

The LT3724 has a powerful on-board gate driver capable of slewing large N-channel MOSFETs quickly. It operates at a constant 200kHz switching frequency and safely powers a pre-biased load by not allowing negative currents to flow in the output inductor. Current mode control provides fast transient response, stable operation over a wide range of voltages, load currents, temperatures and capacitor values. Furthermore, the LT3724 has a high voltage on-board regulator to develop the IC bias voltage that can be back driven to increase efficiency. The operating efficiency when used as a step-down converter can be as high as 93%. Additional features include precision undervoltage lockout, 10uA shutdown current, programmable soft-start to control the turn-on time, a ±1.3% reference voltage accuracy over temp and thermal shutdown.

The LT3724MP is available from stock in a thermally enhanced 16-pin TSSOP with prices starting at $5.94 each for 1,000 piece quantities.

Summary of Features: LT3724MP

VIN Range from 4V to 60V
Output Voltages to 36V
Military Plastic Grade Operating Temp Range of -55°C to +125°C
Step-up, Step-down, Inverting & SEPIC Topologies
On Board Regulator for Internal Bias Voltage
Strong On-Board N-Channel MOSFET Driver
100uA Quiescent Current
10uA Shutdown Current
200kHz fixed Operating Frequency
Current Mode Control
Programmable Soft-Start
Thermal Shutdown
Programmable Undervoltage Lockout
±1.3% Reference Voltage Accuracy over -55°C to +125°C
High Reliability, Multi-Topology DC/DC Controller

About Linear Technology

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule™ products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

For more information, visit www.linear.com.


Note: The above text is the public part of the press release obtained from the manufacturer (with minor modifications). EETimes Europe cannot be held responsible for the claims and statements made by the manufacturer. The text is intended as a supplement to the new product presentations in EETimes Europe magazine.


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