LEDS are certainly set for a bright future but what are the issues in driving them. Tony Armstrong takes a look.

The LTC3634 is a high efficiency, dual-channel monolithic synchronous step-down regulator from Linear Technology, which provides power supply and bus termination rails for DDR1, DDR2 and DDR3 SDRAM controllers. The LTC3634 operates from an input voltage from 3.6V to 15V, making it ideal for dual cell Li-Ion applications as well as 5V and 12V intermediate bus systems. The LTC3634 incorporates a unique constant frequency/controlled on-time, current...

Linear Technology Corporation introduces the LTC4266A and LTC4274A, 4-port and single-port Power over Ethernet (PoE) controllers for Power Sourcing Equipment (PSE), delivering up to 90W of power to Powered Devices (PDs). The current IEEE standard, 802.3at (also known as PoE+), limits the maximum available power to PDs to 25.5W. By the time the standard was ratified in 2009, applications were already demanding higher power levels. The LTC4266A and...

Linear Technology announced the LT3015, a 1.5A negative low dropout linear regulator featuring fast transient response, low noise, and precision current limit. With its wide input voltage range of -1.8V to -30V and adjustable output voltage from -1.220V to -29.5V, the device’s common emitter NPN power transistor design requires only a single supply and enables a low dropout voltage of 310mV (typical at full load). Output voltage noise is only 6...

Linear Technology Corporation today remembered the company’s long-time Staff Scientist Jim Williams, who died on June 12. Williams, who worked for Linear Technology for nearly three decades, started as an applications engineer in the early years of the company.

Linear Technology Corporation introduces the LTC4155, a high power, I2C controlled, high efficiency PowerPath manager, ideal diode controller and lithium-ion battery charger for single-cell portable devices such as tablet PCs, ultra-mobile PCs (UMPCs), personal video players, smart phones, digital cameras, PDAs, portable medical and industrial devices and personal navigation devices. The IC is designed to efficiently transfer up to 15W from a var...

Linear Technology annonce le LTC5569, un mélangeur RF double, aux performances élevées, qui présente une combinaison d’un IIP3 (point d’interception d’entrée du 3ème ordre) de 26,8 dBm, de 300 mW par mélangeur et d’une couverture de la gamme de fréquences pour les récepteurs multi-mode 4 G RRH (Remote Radio Head : tête radio déportée) et MIMO (entrée multiple - sortie multiple), de forte densité . Ce mélangeur fonctionne s...

Linear Technology announces the LTC5569, a dual high performance RF mixer that packs a combination of 26.8dBm IIP3 (Input Third Order Intercept), 300mW per mixer and wide operating frequency coverage to address high density footprints of multimode 4G RRH (Remote Radio Head) MIMO (Multiple-Input, Multiple-Output) receivers. This mixer operates over a wide 300MHz to 4GHz frequency range, so a single part can be configured to operate on any of the c...

To simplify the distribution of wireless communications for instrumentation, monitoring and control applications, power supply designers strive for device grid-independence. Batteries, the immediately obvious solution, offer the illusion of grid independence, but require replacement or recharging, which means eventual connection to the grid and expensive human intervention and maintenance. Enter energy harvesting, where energy is collected from t...

Linear Technology announced the high reliability (MP-grade) version of the LTC3805/-5, a programmable frequency flyback controller that operates over a -55°C to 150°C junction temperature range. This high-performance shunt regulated input voltage PWM (pulse width modulation) controller enables for wide input voltages ranging from 5V to off-line applications and is ideal for users requiring one power supply for both 48V and 24V nominal input sy...

As environmental concerns over traditional lighting increase and the price of LEDs decreases, high power LEDs are fast becoming a popular lighting solution for offline applications. In order to meet the requirements of offline lighting—such as high power factor, high effi ciency, isolation and TRIAC dimmer compatibility—prior LED drivers used many external discrete components, resulting in cumbersome solutions. The LT®3799 solves complexity...

Linear Technology announces the LT3746, a 32-channel LED driver integrated with a 55V step-down controller. The LED driver powers up to 30mA of LED current for each channel, which can drive up to 13V of LEDs in series, making it ideal for applications such as large LED billboards.

Linear Technology présente le LTM4613, un régulateur µModule®, abaisseur, 8 A, certifié par TUV Rheinland, un laboratoire accrédité, de répondre aux limites d’émissions des EMI (interférences électromagnétiques) EN55022 classe B, jusqu’à 96 W de puissance en sortie. Conçu pour accepter une tension d’entrée de 5 V à 36 V, le LTM4613 génère une tension de sortie régulée, de 3,3 V à 15 V, avec une erreur DC de 2 % sur la ...

Linear Technology introduced the LTM4613, an 8A step-down µModule regulator certified by TUV Rheinland an accredited laboratory, to meet EN55022 Class B EMI (electromagnetic interference) emissions limits at up to 96W of output power. Designed to accept an input voltage from 5V to 36V, the LTM4613 delivers a regulated output voltage from 3.3V to 15V with 2.0% maximum DC error over line, load and temperature. The converter achieves peak operating...

Linear Technology Corporation announces a new high reliability (MP-grade) version of the LT3511, a high voltage isolated monolithic flyback regulator that operates over a -55°C to 150°C junction temperature range. This device simplifies the design of an isolated DC/DC converter since it needs no optocoupler, third winding or signal transformer for feedback, as the device’s output voltage is sensed from the primary-side flyback signal. The LT3...

Linear Technology introduces the LT5400, its first family of precision matched resistors designed for high performance signal conditioning applications in difference amplifiers, precision dividers, references and bridge circuits. Three resistor network options are in full production today with resistor ratios of 1:1 and 10:1 quad 10K resistors, quad 100K resistors and dual 10K / dual 100K resistors. Each LT5400 has guaranteed matching of 0.01% fr...

Linear Technology Corporation announces the LT3645, a 500mA (IOUT), 36V step-down switching regulator and integrated LDO packaged in a 3mm x 3mm QFN or MSOP-12E. The LT3645 operates from a VIN range of 3.6V to 36V with transient protection to 55V, making it ideal for load dump and cold-crank conditions found in automotive applications. Its internal 0.75A internal switch can deliver up to 500mA of continuous output current to voltages as low as 0....

Linear Technology announces the LT3597, a 60V, 1MHz, step-down DC/DC converter designed to operate as a three channel, constant current LED driver. Each channel of the LT3597 contains a constant current sink LED driver with a dedicated adaptive-output buck converter.

Linear Technology Corporation announces the LT3645, a 500mA (IOUT), 36V step-down switching regulator and integrated LDO packaged in a 3mm x 3mm QFN or MSOP-12E. The LT3645 operates from a VIN range of 3.6V to 36V with transient protection to 55V, making it ideal for load dump and cold-crank conditions found in automotive applications.

Linear Technology introduced the LT5400, its first family of precision matched resistors designed for high performance signal conditioning applications in difference amplifiers, precision dividers, references and bridge circuits.