Analog Devices Ltd

The LT3975 is a 42V step-down switching regulator that can deliver 2.5A of continuous output current and requires only 2.7µA of quiescent current. Similarly, the LT3976 can operate from a 40V input, delivers up to 5A of output current and requires only 3.3µA of quiescent current. Both devices offer a 4.2V to a nominal 40V input voltage range, making them ideal for automotive and industrial applications. Their internal high 75mOhm switches deliver efficiencies as high as 90%. The LT3975's and LT3976's Burst Mode operation offers ultralow quiescent current, a feature that is also well suited for automotive and industrial systems applications that demand always-on operation and optimum battery life. The devices' unique design maintains a minimum dropout voltage of only 500mV when the input voltage drops below the programmed output voltage, a functional necessity in applications subject to automotive cold-crank conditions. Switching frequency is user-programmable from 200kHz to 2MHz, and synchronizable from 250kHz to 2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of their 16-lead thermally enhanced MSOP package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.These devices use a high efficiency 75mOhm switch, with the boost diode, oscillator, control and logic circuitry integrated into a single die. Special design techniques and a new high voltage process deliver high efficiency over a wide input voltage range, and their current-mode topology enables fast transient response and excellent loop stability. The LT3975 and LT3976 are available in E-grade, I-grade and H-grade versions and prices range from $3.10 to $4.38 each in 1,000-piece quantities.

The LT3055 is a high voltage, low noise, low dropout voltage linear regulator offering precision, programmable current limit and diagnostic capability. The device delivers up to 500mA output current with a 350mV dropout voltage at full load. This device features a wide 2V to 45V input voltage range, delivering adjustable output voltages from 0.6V to 40V. A single capacitor at the REF/BYP pin provides programmable low noise operation - only 25µVRMS across a wide bandwidth of 10Hz to 100kHz, and also reference soft start functionality, preventing output voltage overshoot at turn-on. Output voltage tolerance is highly accurate at ±2% over line, load and temperature. The LT3055 provides several diagnostic and safety functions. A resistor at the IMAX pin programs current limit, accurate to ±10% over the full temperature range. Also, a resistor at the IMIN pin programs a minimum output current detector, useful for identifying open-circuit conditions. Furthermore, a current monitor function sources current equal to 1/500th of output current, allowing the user to measure output current or calculate the device's power dissipation. The LT3055's wide input and output voltage ranges, fast transient response, low quiescent current of 65µA (operating) and <1µA (in shutdown) make it an excellent choice for active antenna supplies, industrial power supplies, battery-powered systems requiring optimum run time, and high reliability power supplies requiring diagnostic information and protection functions. The LT3055 is available in thermally enhanced 16-lead 3mm x 4mm DFN and 16-lead MSOP packages. The E- and I-grade versions feature an operating junction temperature of -40°C to +125°C, MP-grade operates from -55 to +150°C and the H grade operates from -40°C to +150°C. 1,000 piece pricing starts at $2.20 each for the E grade.

The LT3995 is a 3A, 60V step-down switching regulator, requiring only 2.7µA of quiescent current. It's 4.3V to 60V input voltage range makes it ideal for automotive, commercial vehicle, avionic and industrial applications. Its internal 4.7A switch can deliver up to 3A of continuous output current to voltages as low as 1.2V. The Burst Mode operation of this device 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.The unique design of the LT3995 ensures a minimum dropout voltage of only 500mV even when the input voltage drops below the programmed output voltage, suitable for applications subjected to scenarios such as automotive cold-crank. Switching frequency is user-programmable from 200kHz to 2MHz, and synchronizable from 250kHz to 2MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 16-lead thermally enhanced MSOP package and high switching frequency keeps external inductors and capacitors small, providing a highly compact, thermally efficient footprint.Special design techniques and a new high voltage process enable efficiencies up to 90% over a wide input voltage range, while the LT3995's current mode topology assures fast transient response and excellent loop stability. Other features include a power good flag, soft-start capability and thermal protection. The LT3995EMSE is packaged in a thermally enhanced MSOP-16, priced starting at $3.55 each for 1,000 piece quantities. The LT3995IMSE is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and the LT3995HMSE is tested and guaranteed to operate from a -40°C to 150°C.

The LTC400-1 is a high voltage controller and power manager with input maximum power point control (MPPC) that converts virtually any externally compensated DC/DC power supply into a full-featured battery charger. This controller is capable of driving typical DC/DC converter topologies, including buck, boost, buck-boost, SEPIC, flyback and forward. The device offers precision input current monitoring and charge current monitoring and regulation. It operates across a wide 3V to 60V input and output voltage range, compatible with a variety of different input voltage sources, battery stacks and chemistries including lithium-ion/polymer/phosphate, sealed lead acid (SLA) and nickel-based. The LTC4000-1's MPPC circuit features an input voltage regulation loop that controls charge current to maintain the input voltage at a programmed level, ideal for solar panels or other high impedance sources. Applications include: high power battery charger systems, high performance portable instruments, battery backup systems, and industrial or military battery-equipped devices.The LTC4000-1 features an intelligent PowerPath topology that preferentially provides power to the system load when input power is limited. It controls external PFETs to provide low loss reverse current protection, efficient charging and discharging of the battery, and instant-on operation to ensure that system power is available at plug-in, even with a deeply discharged battery. External sense resistors and precision sensing ensure accurate currents at high efficiency, allowing operation with converters that span a wide power range. The LTC4000-1 is housed in low profile (0.75mm) 28-pin 4mm x 5mm QFN and 28-lead SSOP packages and is guaranteed for operation from -40°C to 125°C. 1,000-piece pricing starts at $3.95 each.

The LT3955 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator with an internal 3.5A switch.The device's internal PWM dimming generator makes it ideal for driving high current LEDs and is also able to charge batteries and supercapacitors. The 4.5V to 60V input voltage range suits a wide variety of applications, including automotive, industrial and architectural lighting. The LT3955 uses an internal 3.5A, 80V N-channel MOSFET and can drive up to twelve 300mA white LEDs from a nominal 12V input delivering in excess of 20 watts. It incorporates a high-side current sense enabling use in boost mode, buck mode, buck-boost mode or SEPIC topologies. It can deliver efficiencies of over 94% in the boost topology eliminating the need for external heat sinking. The user can program the frequency between 100kHz and 1MHz, optimizing efficiency while minimizing external component size and cost. It offers a highly compact high power LED driver solution. The LT3955 has an internal PWM generator that delivers dimming ratios as high as 25:1 or it can utilise an external PWM signal, delivering dimming ratios of up to 3,000:1. For less demanding dimming requirements it can provide a 10:1 analog dimming range. Its fixed frequency, current-mode architecture offers stable operation over a wide range of supply and output voltages. Output short-circuit protection and open LED protection enhance system reliability. The ground-referenced voltage FB pin serves as the input for several LED protection features and makes it possible for the converter to operate as a constant-voltage source for charging applications. The LT3955 is available in a 36-lead 5mm x 6mm QFN package, pricing starts at $3.75 each. An extended temperature version is priced starting at $4.41 each for 1,000-piece quantities.

The LTC3863 is a high voltage inverting DC/DC controller that uses just a single inductor to produce a negative voltage from a positive input voltage.Most low to medium power inverters utilise a coupled inductor topology, or transformer which increases the circuit size and complexity.This device simplifies the design further with all of its interface signals being positive ground referenced. None of the LTC3863 pins are connected to a negative voltage allowing the output voltage to be limited only by the selection of external components.The LTC3863, operating over a 3.5V to 60V input supply range, is designed to protect against high voltage transients, to operate continuously during automotive cold crank and cover a broad range of input sources and battery chemistries.This device helps increase the run-time in battery-powered applications with its low 70µA quiescent current in standby mode with the output enabled in Burst Mode operation. The LTC3863's output voltage can be set from -0.4V to -150V or lower at up to 3A typical; making it well suited for 12V or 24V automotive, heavy equipment, industrial control, robotic and telecom applications.The LTC3863 drives an external P-channel MOSFET, operates with a selectable fixed frequency between 50kHz and 850kHz and is synchronizable to an external clock from 75kHz to 750kHz. Its current-mode architecture provides easy loop compensation, fast transient response, cycle-by-cycle over current protection and excellent line regulation.The LTC3863 is offered in 12-pin thermally enhanced MSOP and 3mm X 4mm QFN packages. The industrial grade versions operate from -40°C to 125°C junction temperature. The H-grade version is guaranteed to operate from -40°C to 150°C while the high reliability version is guaranteed from -55°C to 150°C. The 1,000-piece price starts at $2.06 each.

The LT3763 is a synchronous buck LED driver controller that delivers over 300W of LED power. Its output voltage can be set from 0V to 55V enabling it to drive a wide range of LEDs in a single string. The 6V to 60V input voltage range makes it ideal for a wide variety of applications, including automotive, industrial and architectural lighting. The LT3763 offers both input and output current monitors and limiting, which accurately control both input and output current. It also offers accurate output voltage regulation as well as input regulation, useful for high impedance sources such as solar panels. The constant current and constant voltage regulation makes it ideal for applications ranging from driving high brightness LEDs to battery and supercap charging. Additionally, True Color PWM dimming capability offers dimming ranges as wide as 3,000:1 for LED applications. The unique design utilises four control loops to monitor input current, LED /output current, output and input voltage to deliver optimum performance and reliability.The LT3763 uses two external switching MOSFETs and can deliver from 5W to over 300W of continuous LED power with efficiencies up to 96%. LED current accuracy of ±6% ensures constant lighting while ±1.5% output voltage accuracy offers several LED protection features and enables the converter to operate as a constant voltage/constant current source for charging applications. It can utilise either analog or PWM dimming as required by the application. Furthermore, its switching frequency can be programmed between 200kHz and 1MHz or synchronized to an external clock.The LT3763 is available in a 28-lead thermally enhanced TSSOP package; there is an extended temperature version and a high temperature version, price starting ranges from $4.45 to $5.15 each in 1,000-piece quantities.

The LTC2057HV is a zero-drift amplifier featuring self-calibrating circuitry that provides high DC precision and stability over changes in temperature, time, input range and supply voltage. With 5µV input offset voltage, 0.025µV/°C offset drift and 220nVP-P low frequency noise with no 1/f noise, the LTC2057HV offers more than 140dB dynamic range while operating on a 60V (±30V) supply. This wide dynamic range enables tiny signals to be amplified in the presence of much larger signals without saturating the amplifier or losing precision. For applications requiring supply voltages up to 36V, a lower supply version of LTC2057 is available.Specified over a -40°C to 125°C temperature range, the LTC2057 and LTC2057HV offer an optimal combination of low voltage noise, low current noise and low input bias current, while the zero-drift architecture cancels 1/f noise. Spurious artifacts normally associated with zero-drift amplifiers are suppressed, further extending the dynamic range, stability and useful signal bandwidth. The input common-mode range includes the negative rail and the output swings rail-to-rail, making the LTC2057 suitable for single- and dual-supply industrial, instrumentation and automotive applications.The LTC2057 is specified for 30V supply operation while the LTC2057HV can operate on supplies up to 60V. Both versions also work on 4.75V supplies and are fully specified over -40°C to 85°C and -40°C to 125°C temperature ranges. The LTC2057 is available in 3mm x 3mm DFN, MSOP-8 and SOIC-8 packages, as well as an MSOP-10 package with a pin-out that enables a guard ring to be easily routed around the input to preserve the high precision and low noise performance at high source impedance. Pricing starts at $1.54 each for the LTC2057 and $2.19 each for the LTC2057HV in quantities of 1000.

The LTC2378-20 is a 20-bit 1Msps no latency successive approximation register (SAR) analog-to-digital converter with exceptionally low 0.5ppm (typ) and 2ppm (max) Integral Non-Linearity (INL) error.INL is a key specification in precision applications, such as seismic monitoring and semiconductor fabrication, indicating how much the ADC transfer function deviates from its ideal. Since linearity effectively cannot be calibrated at the system level, the ADC's INL specification often sets the overall system accuracy.The best-in-class 0.5ppm INL of the LTC2378-20 enables a new generation of precision systems with true 20-bit accuracy. The proprietary architecture leads to an extremely stable 2ppm (max) INL and -114dB THD (max) over the device's entire operating range of -40°C to 85°C.The LTC2378-20 achieves the industry's highest signal-to-noise ratio (SNR) of 104dB for a 1Msps no latency ADC. The wide dynamic range and true 20-bit resolution reduce or eliminate the need for additional gain in the signal chain, thereby improving total system accuracy and noise. Fast 1Msps throughput with no latency enables the use of multiplexers to replace costly, independent ADCs with slower throughputs, thus reducing system cost and complexity.The LTC2378-20 is the leadership product in a pin- and software-compatible family of 20/18/16-bit SAR ADCs with speeds ranging from 250ksps up to 2Msps with serial SPI interfaces. The family operates from a 2.5V supply, with a ±5V fully differential input range using an external 5V reference.The DC1925A evaluation kit demonstrates the 0.5ppm INL and 104dB SNR performance of the LTC2378-20. The LTC2378-20, LTC2377-20 and the LTC2376-20 are available in small MSOP-16 and 4mm x 3mm DFN-16 packages, priced starting at $29.50, $25.50 and $18.17 each, respectively, in 1,000 piece quantities.

The LT6110 is a cable drop compensator, a new device that improves voltage regulation at remote loads without the need for Kelvin sense wires.This is a new component for the designer, which has been architected for use with most types of voltage regulators and can provide several volts of load regulation compensation.This device will compensate for the voltage drop due to resistance in a wire, circuit board trace or cable and can improve regulation at the load by a factor of 10. It operates with supply voltages that range from 2V to 50V, making it suitable for high power USB, Power over Ethernet (PoE), remote instrumentation and remote industrial applications.This cable drop compensator reduces costs by eliminating sense wires which may be prone to misconnection or damage and it makes load regulation independent of wire size or length.The LT6110 operates by measuring the load current with a sense resistor and injecting current into the existing regulator's feedback loop to raise the output voltage. It is designed to work with standard feedback circuits, as well as new "current source" reference devices such as the LT3080.For load currents less than 3A, the internal 20mOhm sense resistor simplifies the design. Wide bandwidth achieves fast transient compensation of load steps, and in most cases the savings in wire and labor are more than the cost of the LT6110.According to Robert Dobkin, Vice President of Engineering and CTO for Linear Technology, "The LT6110 is a unique power supply component that gives designers a new degree of freedom by improving voltage regulations without the need of sense wires."The LT6110 is fully specified for operation from -40°C to 125°C and is offered in SOT23 and 2mm x 2mm DFN packages. It is now available, priced starting at $1.29 each in 1,000-piece quantities.