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LTC News
Linear Technology Corporation News Releases

• 2.5µA Quiescent Current, 60V, 350mA(IOUT), 2.2MHz Step-Down DC/DC Converter
  MILPITAS, CA - December 8, 2009 - Linear Technology Corporation announces the LT3990, a 350mA, 60V ultralow quiescent current step-down switching regulator. Its Burst Mode® operation keeps quiescent current under 2.5µA in no load condition. The LT3990's 4.3V to 60V input voltage range makes it ideal for automotive and industrial applications that need continuous output with ultralow power drain. Its internal 550mA switch can deliver up to 350mA of continuous output current at voltages as low as 1.21V. The LT3990's Burst Mode operation provides ultralow quiescent current, well suited for automotive or industrial systems, which demand always-on operation and optimum battery life. Switching frequency is user programmable from 200kHz to 2.2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 10-lead 3mm x 2mm DFN-10 (or MSOP) package and high switching frequency keeps external inductors and capacitors small, providing a very compact, thermally efficient footprint.
• Selectable 250sps/1ksps 16-Bit ADC Integrates 10ppm/ºC Max Precision Reference
  MILPITAS, CA - December 7, 2009 - Linear Technology Corporation introduces the LTC2470 and LTC2472, a pair of 16-bit delta sigma ADCs that integrate a high accuracy reference in tiny 3mm x 3mm DFN and 12-lead MSOP packages. The device's integrated 1.25V reference offers 2ppm/ºC drift performance and 0.1% initial accuracy for precise measurements in space-constrained applications. Both ADCs provide guaranteed 16-bit no missing code resolution and selectable 250sps or 1ksps output rate. The LTC2470 and LTC2472 are ideal for system and environmental monitoring and data acquisition systems requiring fast output rates.
• 37VIN, 1.2A(IOUT), 2.5MHz Step-Down DC/DC Converter Withstands 55V Transients
  MILPITAS, CA - December 3, 2009 - Linear Technology Corporation announces the LT3686, a 1.2A, 37VIN step-down switching regulator. The LT3686 operates within a VIN range of 3.6V to 37V with overvoltage lockout, protecting the regulator and load from transients as high as 55V, making it ideal for load dump and cold-crank conditions commonly found in automotive applications as well as 24V industrial supplies. Its internal 1.85A switch can deliver up to 1.2A of continuous output current at voltages as low as 0.8V. Its low minimum on-time enables it to offer high switching frequencies even with high step-down ratios. For example, with an input as high as 16V, it can deliver a 3.3V output using a 2MHz switching frequency.
• 60VIN, 4A DC/DC µModule Regulator in 15mm x 15mm x 4.32mm Plastic Surface Mount Package
  MILPITAS, CA - December 2, 2009 - Linear Technology Corporation introduces the LTM8027, a 4A system-in-a-package DC/DC µModule® regulator capable of operating from a 60V supply without any input protection. The LTM8027 includes the inductor, power switches, switching regulator and all support components in a small 2.6g 15mm x 15mm x 4.32mm land grid array (LGA) plastic package. The device can regulate an output voltage ranging from 2.5V to 24V from an input supply of 4.5V to 60V (65V absolute maximum). The LTM8027's rugged voltage rating makes it a suitable voltage regulator for 12V and 24V automotive and heavy equipment such as industrial robotics, 48V telecom, as well as avionics and industrial control systems.
• Ultralow Voltage 20mV Step-Up Converter & Power Manager for Energy Harvesting Applications
  MILPITAS, CA - December 1, 2009 - Linear Technology announces the LTC3108, a highly integrated step-up DC/DC converter designed to start-up and run from extremely low input voltage sources such as thermoelectric generators (TEGs), thermopiles and small solar cells. Its self-resonant topology steps up from input voltages as low as 20mV. Small temperature differences can be harvested and used to generate system power instead of traditional battery power. Energy harvesters are designed for applications requiring very low average power, but require periodic pulses of higher load current. For example, in many wireless sensor applications the circuitry is only powered to take measurements and transmit data periodically at low duty cycle.
• 55V, 1.2A (IOUT) Step-Down DC/DC Converter with Only 2.8µA Quiescent Current
  MILPITAS, CA - November 24, 2009 - Linear Technology Corporation announces the LT3991, a 1.2A, 55V step-down switching regulator with an integrated boost diode. Its Burst Mode® operation keeps quiescent current under 2.8µA in no load standby conditions. The LT3991's 4.3V to 55V input voltage range makes it ideal for automotive and industrial applications. Its internal 1.7A switch can deliver up to 1.2A of continuous output current to voltages as low as 1.19V. The LT3991's Burst Mode operation offers ultralow quiescent current, making it well suited for applications such as automotive or industrial systems that demand always-on operation and optimum battery life. Switching frequency is user programmable from 200kHz to 2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 10-lead 3mm x 3mm DFN or thermally enhanced MSOP packages and high switching frequency keep external inductors and capacitors small, providing a compact, thermally efficient footprint.
• 38V, 1.2A (IOUT), 2MHz Step-Down DC/DC Converter at Only 2.8µA Quiescent Current
  MILPITAS, CA - November 16, 2009 - Linear Technology Corporation announces the LT3971, a 1.2A, 38V step-down switching regulator with an integrated boost diode. Its Burst Mode® operation keeps quiescent current under 2.8µA in no load standby conditions. The LT3971’s 4.3V to 38V input voltage range makes it ideal for automotive and industrial applications. Its internal 2.4A switch can deliver up to 1.2A of continuous output current to voltages as low as 1.19V. The LT3971’s Burst Mode operation offers ultralow quiescent current, making it well suited for applications such as automotive or industrial systems, which demand always-on operation and optimum battery life. Switching frequency is user programmable from 200kHz to 2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 10-lead 3mm x 3mm DFN-10 (or thermally enhanced MSOP) package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.
• Highest Efficiency Rail-to Rail Op Amp Achieves 180MHz at 1mA
  MILPITAS, CA - November 12, 2009 - Linear Technology introduces the LTC6246, LTC6247 and LTC6248, a family of op amps that utilizes a power-efficient SiGe process to achieve 180MHz gain-bandwidth product and 90V/µs slew rate, while consuming just 1mA maximum supply current per amplifier. These single, dual and quad op amps also feature rail-to-rail inputs and outputs, and 4.2nV/√Hz wideband noise.
• High Efficiency PSE Controller Addresses New IEEE 802.3at PoE+ Standard
  MILPITAS, CA - November 11, 2009 - Linear Technology Corporation introduces the LTC4274, a single-channel Power over Ethernet (PoE) controller for power sourcing equipment (PSE) required to provide IEEE 802.3at (25.5W) or proprietary higher power levels. Next-generation PoE applications call for more power to support demanding features, while increasing power efficiency in an effort to be more "green" and reduce costs. The LTC4274 provides up to 100W over 4-pair Ethernet cabling and is fully compliant with the new IEEE 802.3at PoE+ standard and backward compatible with the prior IEEE 802.3af PoE standard. To help conserve power, the LTC4274 delivers the lowest-in-industry heat dissipation by using low RDS(ON) MOSFETs and 0.25Ohm sense resistors, eliminating the need for expensive heat sinks and providing a more robust PSE solution.
• High Power Dual Output Multiphase Step-Down DC/DC Controller with Differential Output Voltage Sensing, Tracking & PLL
  MILPITAS, CA - November 10, 2009 - Linear Technology Corporation introduces the LTC3855, a dual output high efficiency (up to 95%) synchronous step-down DC/DC controller with multiphase operation, differential output voltage sensing and integrated phase-lock loop (PLL) synchronization. Up to 12 phases can be paralleled and clocked out of phase to minimize input and output filtering requirements for high current applications (up to 200A). The differential amplifier provides true remote output voltage sensing of both the positive and negative terminals, enabling high accuracy regulation where IR losses occur through vias, trace runs and interconnects. Applications include high current ASIC and FPGA supplies, power distribution buses, high power audio amplifiers and network servers.
• Wide Input Voltage Range Low Minimum On-Time Synchronous Step-Down DC/DC