Analog Devices Ltd

The LTC3639 is a 150V input-capable synchronous buck converter that delivers up to 100mA of continuous output current. It operates from an input voltage range of 4.5V to 150V, eliminating the need for an external transient suspension device.The LTC3639 utilises internal synchronous rectification and a programmable peak current-mode design to optimize efficiency over a broad range of output currents. It delivers efficiencies as high as 92% and requires only 12µA of quiescent current, maximizing battery run time and eliminating thermal issues.A user-programmable output current limit can set output current from 10mA to 100mA thereby minimizing the need to oversize external components and protecting high impedance sources. The LTC3639 can be programmed with fixed output voltages of 1.8V, 3.3V or 5V or a resistor divider can be used to program outputs from 0.8V to VIN.The LTC3639's thermally enhanced MSOP package offers the additional pin spacing required for high voltage inputs. The combination of its MSOP package with only three tiny externals provides a highly compact solution footprint for a broad range of applications.The internal high side and synchronous power switches of the device, drawing only 12µA at no load while maintaining output voltage regulation, make it ideal for always-on battery-powered applications.Pricing for the LTC3639EMSE starts at $3.65 each. An industrial version the LTC3639IMSE is guaranteed to operate from -40°C to 125°C operating junction temperature, priced at $4.02 each.An automotive version the LTC3639HMSE is guaranteed to operate over -40°C to 150°C is priced at $4.27 each while a high reliability military plastic version, the LTC3639MPMSE, is tested and guaranteed to operate from -55°C to 150°C, is priced at $10.84 each. All pricing is for 1,000 piece quantities.

The LTC3129 is a synchronous buck-boost converter that delivers up to 200mA of continuous output current from a wide variety of input sources including single or multiple-cell batteries as well as solar panels and supercaps. Its 2.42V to 15V input range and 1.4V to 15.75V output range provide a regulated output with inputs above, below or equal to the output. The low noise buck-boost topology provides a continuous transition through all of the operating modes, making it ideal for applications that must maintain a constant output voltage, even as the input source voltage transitions through the output voltage. It also includes programmable maximum power point control (MPPC) capability, ensuring maximum power extraction from non-ideal power sources such as photovoltaic cells.Quiescent current of only 1.3µA makes the LTC3129 well suited for always on and energy harvesting applications in which extended battery run time is of primary importance. The constant 1MHz switching frequency ensures low noise and high efficiency, while minimizing the size of the external components. The combination of tiny externals and a 3mm x 3mm QFN or MSOP-16E package provides a very small solution footprint. Other features include a power good indicator, current-mode control, internal compensation thermal shutdown and output disconnect.The LTC3129-1 version offers eight fixed output voltages from 2.5V to 15V that are user-programmable and eliminate the resistor divider required on the adjustable version.Both the LTC3129EUD and LTC3129EUD-1 are available in a 16-lead 3mm x 3mm QFN package. The LTC3129EMSE and LTC3129EMSE-1 are offered in a thermally enhanced 16-lead MSOP package. Pricing starts at $2.95 each for 1,000-piece quantities. Industrial grade versions are guaranteed to operate over a -40°C to 125°C operating temp range and are priced at $3.25 each.

The LTC3122H is the high temperature H-grade version of the LTC3122 in a12-lead thermally enhanced MSOP package. The LTC3122 is a 3MHz current-mode, synchronous boost DC/DC converter with integrated output disconnect. Its internal 2.5A switches deliver output voltages as high as 15V from an input voltage range of 1.8V at start-up (0.5V when running) to 5.5V, making it ideal for various battery chemistries or standard 3.3V and 5V power sources. The LTC3122 can deliver up to 800mA of continuous output current at 12V from a 5V input. Pin-selected Burst Mode operation lowers quiescent current to only 25µA, providing extended battery run time in handheld applications. The combination of its thermally enhanced MSOP-12 package and a constant switching frequency up to 3MHz enables the designer to balance printed circuit board solution size with required efficiency.The H-grade version is specified over an operating junction temperature range of -40°C to +150°C. The electrical specifications are identical to the existing E- and I-grade versions of this device. This H-grade version is ideal for automotive, industrial and military applications that are subject to high ambient temperatures. The LTC3122HMSE is available in a 12-lead thermally enhanced MSOP package, priced starting at $2.98 each for 1,000-piece quantities.

The high temperature H-grade (-40°C to 150°C junction temp) and high reliability MP-grade (-55°C to 150°C) versions of the LTC3115-1 are now available.The LTC3115-1 is a synchronous buck-boost converter that delivers up to 2A of continuous output current from a wide range of power sources from single-cell Li-Ion to 24V/28V industrial rails to 40V automotive inputs.This converter's 2.7V to 40V input and output range provides a regulated output with inputs above, below or equal to the regulated output. The low noise buck-boost topology incorporated in the LTC3115-1 provides a continuous, jitter-free transition between buck and boost modes, making it ideal for RF and other noise-sensitive applications that must maintain a low-noise constant output voltage with a variable input power source. Efficiency of up to 95% extends run time in battery powered systems.The LTC3115-1's switching frequency is user- programmable between 100kHz and 2MHz, and can be synchronized to an external clock. Proprietary buck-boost PWM circuitry ensures low noise and high efficiency while minimizing the size of external components. The combination of tiny externals and a TSSOP-20E package provide a compact solution footprint. The H-grade version operates from -40°C to a maximum junction temperature of 150°C, guaranteed throughout this temperature range and similarly the MP grade version operates from -55°C to 150°C. For both the H grade and the MP grade, the electrical specifications are identical to the industrial grades. They are ideal for automotive, industrial and military applications, which are subject to extreme ambient temperatures. Both the LTC3115HFE-1 and the LTC3115MPFE-1 are available in a 20-lead thermally enhanced TSSOP package. Pricing starts at $6.36 and $16.48 each, respectively, for 1,000-piece quantities.

The LT3954 is a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator with an internal 5A switch. It's internal PWM dimming generator makes it ideal for driving high current LEDs, and is also suitable for charging batteries and super-capacitors.The 4.5V to 40V input voltage range suits a wide variety of applications, including automotive, industrial and architectural lighting.This device uses an internal 5A, 40V N-channel MOSFET and can drive up to eight 650mA 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.This device can deliver efficiencies of over 95% in the boost topology, eliminating the need for external heat sinking. A frequency adjust pin permits the user to program the frequency between 100kHz and 1MHz, optimizing efficiency while minimizing external component size and cost. Combined with a 5mm x 6mm QFN package, the LT3954 offers a highly compact high power LED driver solution. The internal PWM generator 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, the CTRL pin can be used to 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.The LT3954EUHE is available in a 36-lead 5mm x 6mm QFN package, pricing starts at $3.60 each. An I-grade extended temperature version, the LT3954IUHE, is priced at $3.96 each based on 1,000-piece quantities.

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 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 LTC6957 is a DC to 300MHz dual output buffer/driver/logic translator, ideal for converting sine waves into low phase noise logic level signals.Prior solutions were unable to perform this conversion without introducing a significant amount of jitter. The LTC6957 converts any DC to 300MHz reference frequency into dual LVPECL, LVDS or CMOS outputs with exceptionally low additive jitter of 45fsRMS (LVPECL) over the 12kHz to 20MHz integration bandwidth and less than 200fsRMS total jitter.The device also features a proprietary, selectable, input stage bandwidth-limiting feature, which substantially improves the additive phase noise for slow slewing signals by 4-7dB.While the LTC6957 can be used to convert any signal type to a logic level signal, it particularly excels with sine waves. The selectable, band-limited input stage enables optimal conversion of sine waves with the lowest additive jitter.The device is ideal for systems that distribute system clock references for board level synchronization. It can also be used as a clock driver for analog-to-digital converters (ADCs), digital-to-analog converters (DACs) or DDS (direct digital synthesis) ICs with clock rates up to 300MHz.The LTC6957 is offered in four output logic signal types: the LTC6957-1 provides two LVPECL outputs, the LTC6957-2 provides two LVDS logic outputs, and the LTC6957-3 and LTC6957-4 offer two in-phase CMOS or complementary CMOS outputs, respectively, with output skew as low as 3ps (typ).Each device is available in small RoHS-compliant 12-pin MSOP or 3mm x 3mm DFN packages and can be ordered in industrial and automotive grades, supporting operating temperature ranges from -40°C to 85°C and -40°C to 125°C, respectively. The LTC6957 is priced starting at $3.60 each in 1,000-piece quantities. Demo boards and samples are available.

The LTM8045 is a 2.8V-18V input, multi-topology DC/DC µModule converter, with onboard inductor, power switch and DC/DC controller delivering up to 700mA output current. With the addition of only two resistors and two capacitors, the LTM8045 can be configured to regulate either a positive output voltage (SEPIC topology) between 2.5V and 15V or a negative output voltage (inverting topology) between -2.5V and -15V. The LTM8045 is designed for point-of-load regulation in communications, imaging and handheld test equipment.In the SEPIC configuration, the LTM8045's input voltage can be above, below or equal to the regulated output voltage. If configured as a negative output inverter, no level shifting circuitry is required by the logic level control pins. Under a -5V, 500mA load, the LTM8045 achieves 80% efficiency from a positive 12V input supply. The operating frequency range is 200kHz to 2MHz, adjustable via an external resistor and can be synchronized to an external clock within the same frequency range.The LTM8045 is packaged in a 6.25mm x 11.25mm x 4.92mm BGA and operation is guaranteed over the -40°C to +125°C and -55°C to +125°C internal temperature range. Pricing starts at $6.97 each for 1,000 piece quantities.

The LTM8028 is a 1mV output ripple µModule regulator designed to power data converters and high speed transceivers.The low output ripple minimizes random jitter in high speed data transceivers for superior bit error rate (BER) performance. When powering an analog-to-digital converter (ADC), tests showed a 13dB improvement in spurious free dynamic range (SFDR) with the LTM8028 compared to a typical step-down regulator.The µModule regulator combines a 36V synchronous step-down switcher, powering a 5A linear post-regulator in a compact 15mm x 15mm x 4.92mm BGA package. To minimize power dissipation and voltage drop across the linear regulator, the linear regulator automatically adjusts the output voltage of the internal synchronous regulator.A tri-state digital interface determines the LTM8028's output voltage, which is adjustable from 0.8V to 1.8V in 50mV increments. Output voltage regulation is ±1.5% accurate over temperature. Output noise is just 40µVRMS over the 10Hz to 100kHz frequency range.This step-down regulator features a user-adjustable current limit accurate within ±10% and adjustable switching frequency between 200kHz to 1MHz, with the option to synchronize to an external clock in the same range.The LTM8028 is guaranteed to operate over the -40°C to +125°C and -55°C to +125°C internal temperature range. The LTM8028 is available for immediate delivery from stock, with price starting at $14.20 each for 1,000 piece quantities.