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 LTM4649 is a 10A step-down µModule regulator with high operating efficiency and low temperature rise in a 9mm x 15mm x 4.92mm BGA (ball grid array) package. This device requires no heat sink, airflow or output current derating at full power from 0°C to 83°C ambient temperature, while operating up to 86% efficiency (5VIN -12VIN, 1.5VOUT at 10A). Output current is reduced only by 4A up to 100ºC ambient and by 2A with 400LFM. The LTM4649 converts input supplies ranging from 4.5V to 16V to lower output voltages ranging from 0.6V to 3.3V. Equipped with a differential remote sense amplifier to compensate for voltage droop due to circuit board trace impedance, the LTM4649 regulates a load voltage with ±1.5% accuracy over line, load and temperature (-40°C to 125°C). This µModule regulator provides input and output clocks for multiphase operation among multiple devices to accurately current share for up to 40A load. Multiphase operation reduces input and output ripple as well as the number of input and output capacitors. Applications include point-of-load conversion from 12V or 5V inputs in telecom, industrial, avionics and test equipment.The LTM4649 is synchronizable to an external clock ranging in frequency from 400kHz to 750kHz. With options for Burst Mode operation for the highest conversion efficiency at light load and pulse-skipping operation for lower output voltage ripple, gives users the option to personalize a circuit's performance. The LTM4649 permits output voltage tracking for sequencing multiple rails in a system. To protect the load, the LTM4649 features output overvoltage and overcurrent protection. The LTM4649 E- and I-grades are guaranteed for internal operation from -40°C to 125°C. Pricing for 1,000-piece quantities starts at $16.75 each.

The LT3795 is a 110V, high-side current sense DC/DC converter designed to regulate a current or voltage to a constant value, ideal for driving high brightness (HB) LEDs. Its 4.5V to 110V input voltage range makes it appropriate for a wide variety of applications, including automotive, industrial and architectural lighting. This converter uses an external low side N-channel MOSFET and can drive up to 90V of white LEDs from a nominal 12V input, delivering in excess of 50 watts. Spread spectrum frequency modulation reduces EMI emissions, while an internal PMOS switch driver delivers robust short-circuit protection in boost and buck-boost topologies. The LT3795 incorporates a high-side current sense, enabling it to be used in boost, buck, buck-boost or SEPIC topologies. Additionally it offers current both input and output current limiting and monitoring for added reliability and design flexibility. It can deliver efficiencies of over 94% in boost mode, minimizing 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 offering a very compact HB LED driver or charger solution. The LT3795 uses PWM dimming, which delivers constant LED color with dimming ranges of up to 3,000:1. For less demanding dimming requirements, the CTRL pin can be used to offer a 10:1 analog dimming range. Its fixed frequency, current mode architecture offers stable operation over a wide range of supply and output voltages. Robust open and short-circuit protection maximize overall system reliability. The LT3795 is available in a thermally enhanced TSSOP-28 package, pricing starts at $3.45 each in 1,000-piece quantities. An extended temperature version is priced at $3.86 each and a high temperature version starts at $4.11 each.

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 LTC3607 is a high efficiency, 2.25MHz synchronous dual output buck regulator that incorporates a peak current mode architecture. It can deliver up to 600mA of continuous output current from each channel at output voltages as low as 0.6V from a 3mm x 3mm QFN or a thermally enhanced MSOP-16 package. The LTC3607 accommodates an input voltage range of 4.5V to 15V, making it suitable for dual cell Li-Ion applications as well as 5V and 12V intermediate bus systems. Its constant switching frequency of 2.25MHz is synchronizable and enables the use of tiny, low cost capacitors and inductors.Each channel of the LTC3607 uses internal switches to deliver efficiencies as high as 96%. Its peak current mode architecture offers excellent line and load transient response. The two channels run 180 degrees out of phase, minimizing the size of input capacitance. Burst Mode operation maximizes light load efficiency, requiring only 55µA at no load, making it well suited for applications demanding maximum battery run time and excellent light load transient response. For applications that require the lowest possible noise, the LTC3607 can be configured to run in pulse-skipping mode, reducing noise and potential RF interference. Additional features include power good voltage monitors, internal compensation, independent soft-start capability for each channel and short-circuit protection. The LTC3607EUD is available in a 3mm x 3mm QFN-16 and in a leaded version, the LTC3607EMSE in a thermally enhanced MSOP-16 package. Pricing starts at $2.35 and $2.45 each, respectively in 1,000-piece quantities. Industrial grade versions, the LTC3607IUD and LTC3607IMSE, are guaranteed to operate over the -40°C to 125°C operating junction temperature range and are priced at $2.59 and $2.70 each, respectively, in 1,000-piece quantities.

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 LTC3621 is a high efficiency, 17V input capable synchronous buck regulator that delivers up to 1A of continuous output current to outputs as low as 0.6V.Synchronous rectification delivers efficiencies as high as 95% while Burst Mode operation requires only 3.5µA of no load quiescent current.The LTC3621 switches at a fixed 1MHz frequency whereas the LTC3621-2 switches at 2.25MHz. Their constant frequency, current-mode architecture minimizes switching noise while offering very fast line and load transient response.The LTC3621/-2 operates from an input voltage range of 2.7V to 17V, making it ideal for single or dual cell Li-Ion applications as well as 12V intermediate bus and automotive systems. The combination of its 2mm x 3mm DFN or MSOP-8 package high switching frequency and tiny, low cost capacitors and inductors ensures a highly compact solution footprint.The LTC3621/-2's 60ns minimum on-time enables it to step-down 16V inputs to 2.5V with a 2.25MHz switching frequency without pulse skipping, making it ideal for automotive applications that must keep switching noise above the AM radio band. It's 3.5µA quiescent current make it well suited for always-on applications demanding maximum battery run time.For applications that require the lowest possible noise, the LTC3621/-2 can be configured to run in pulse-skipping or forced continuous mode, reducing noise and potential RF interference. The LTC3621EDCB and LTC3621EDCB-2 are available in a 2mm x 3mm DFN-6, the LTC3621EMS8E and LTC3621EMS8E-2 are offered in an 8-lead, thermally enhanced MSOP package. Pricing for both package and frequency options starts at $2.55 each in 1,000-piece quantities.Industrial grade versions are guaranteed to operate over a -40°C to 125°C operating junction temperature range and are priced at $2.81 each in 1,000-piece quantities.

The LTM4637 is a 20A DC/DC step-down µModule regulator with onboard precision differential remote sense amplifier.This enables automatic correction of voltage errors caused by droop across PCB traces, which is valuable for powering loads such as FPGAs requiring high currents at low voltages. Total output DC voltage accuracy is guaranteed at +/-1.5% from -40°C to 125°C.The LTM4637 includes the inductor, MOSFETs, DC/DC controller and compensation circuitry. It is housed in a low height (profile) 4.32mm LGA package with a 15mm x 15mm footprint. With a VIN range of 4.5V to 20V, the device's operating efficiency is optimized for 5V and 12V input systems (88%, 12VIN, 1.8VOUT @ 20A).The output voltage can be set with one resistor from 0.6V to 5.5V. Four devices in parallel can deliver 80A of load current. Applications include industrial and medical equipment, and networking and telecom systems.A main feature of the LTM4637 is its drop-in and pin compatibility with the LTM4627 15A output µModule regulator. Systems designers value pin compatibility since they can interchange these products without layout changes at any stage from development to production. Linear offers a series of pin-compatible µModule devices.The LTM4637 features protection functions for overcurrent and overvoltage conditions and the internal temperature of the device can be monitored via an internal temperature sensing diode. The LTM4637 is rated for operation from -40°C to 125°C. The 1000-piece price is $22.10 each.

The LT1965H is a new H-grade, wider temperature range version of the LT1965, a 1A LDO with high power density. The IC features low dropout voltage of only 300mV at full load, wide VIN capability of 1.8V to 20V and an adjustable output from 1.2V to 19.5V. Low output noise of only 40µVRMS reduces noise in instrumentation, RF, DSP and logic supply systems and is beneficial for post-regulating switching power supplies. Output tolerance is tightly regulated to within ±3% over line, load and temperature. The device's low quiescent current of 500µA (operating) and less than 1µA (shutdown) make it an excellent choice for applications requiring high output drive capability with low current consumption.The LT1965 regulator optimizes stability and transient response with low ESR, ceramic output capacitors as small as 10µF. These tiny external capacitors can be used without any necessary series resistance as is common with many other regulators. Internal protection circuitry includes reverse-battery protection, no reverse current, current limiting with foldback, and thermal limiting. For applications requiring large input-to-output differentials, the LT1965 offers a very compact and thermally effective solution. The LT1965 H-grade is rated from -40°C to +150°C operating junction temperature and is offered in the low profile (0.75mm) 8-lead DFN (3mm x 3mm) package, the surface-mount DD-Pak power package and the TO-220 power package. 1,000-piece pricing starts at $2.80 each.

The LTC3245 is a versatile 250mA high voltage buck-boost charge pump.This device uses switched capacitor fractional conversion to maintain regulation over a wide range of input voltage from 2.7V to 38V and produces a regulated output of 3.3V, 5V or adjustable (2.5V to 5V).Internal circuitry automatically selects the conversion ratio (2:1, 1:1 or 1:2) to optimize efficiency as input voltage and load conditions vary.Low operating current (18?A with no load, 4?A in shutdown) and low external device count (three small ceramic capacitors and no inductors) make the LTC3245 ideally suited for low power, space constrained automotive/industrial applications such as automotive ECU/CAN transceiver supplies, industrial housekeeping supplies and efficient low power 12V to 5V conversion.The LTC3245's unique constant frequency architecture with reduced switching edge rates provides lower conducted and radiated noise compared to conventional switching regulators.The device has pin selectable Burst Mode operation which allows the user to trade off low output ripple for better efficiency/lower quiescent current. Other IC features include low external parts count with ceramic capacitor stability, soft-start circuitry to prevent excessive current flow during startup, plus short circuit and thermal protection.The LTC3245 is available in a low-profile (0.75mm) 3mm x 4mm 12-lead DFN with backside thermal pad and a 12-lead MSOP package with backside thermal pad. E- and I-grade operating junction temperature is -40°C to +125°C, while H-grade is -40°C to +150°C. 1000-piece pricing for the E-grade starts at $2.80 each.