Analog Devices Ltd

The LTC3245MP is a high reliability MP-grade wider temperature range version of the LTC3245, a versatile 250mA high voltage buck-boost charge pump, This MP-grade version has an operating junction temperature range of -55°C to +150°C. The LTC3245 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 a conversion ratio of 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/ applications such as 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, enabling the user to trade off low output ripple for better efficiency and lower quiescent current. Other 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 MP-grade is available in a compact 12-lead MSOP package with a backside thermal pad. 1000-piece pricing starts at $7.55 each.

The LTM8050 is a 2A µModule regulator that is protected against input surges up to 60V and can be configured as a step-down or an inverting (i.e., negative output) converter. With 60V input voltage protection, the LTM8050 can be used safely in applications where the main power bus may be susceptible to large voltage spikes or deviations. Examples of such applications are automotive, avionics, factory automation, heavy equipment, transportation, robotics and industrial systems.The operating input voltage of this device is from 3.6V to 58V (60Vmax) and the output is adjustable with one resistor from 0.8V to 24V. When configured as an inverter, the output is adjustable from -0.8V to -24V. The LTM8050 includes an inductor, DC/DC regulator, power FETs, and the compensation circuitry, all housed in a 9 x 15 x 4.92mm BGA package.To increase load current above 2A, up to four LTM8050s can be current shared to deliver as much as 8A. In systems sensitive to switching regulator noise requiring out of band operation, the LTM8050's switching frequency can be adjusted over a wide range from 100kHz to 2.4MHz with an external resistor. The LTM8050 is available for operation in two temperature ranges of -40°C to 125°C and -55°C and 125°C. 1000-piece pricing starts at $14.00 each.

The LTC5551 is an ultrahigh dynamic range RF down-converting mixer for applications that demand the very best in performance. The LTC5551 offers very high linearity of +36dBm IIP3, (input third-order intercept), and low 9.7dB noise figure comparable to the highest IIP3 passive mixers available. Unlike passive mixers which typically have 7dB to 9dB of conversion loss, the LTC5551 boasts 2.4dB of conversion gain, substantially improving receiver dynamic range. The device also has broad RF frequency range capability, operating from 300MHz to 3.5GHz.Additionally, passive mixers require high LO (local oscillator) drive to reach their claimed IIP3. The LTC5551 has an integrated LO buffer requiring only 0dBm drive level, hence external circuitry and costs are minimized. And with the elimination of a high power LO signal in the users' receiver, it substantially reduces a potential source of undesirable radiation, thus simplifying filtering and RF shielding requirements.The LTC5551 ensures robust radio performance with its high 1dB compression point of +18dBm. Both the RF and LO inputs have integrated balun transformers, further reducing cost and external components while simplifying the design task. The mixer is powered from a single 3.3V supply with current consumption of 204mA, delivering its high performance with exceptionally low power. The superior performance of this mixer is ideally suited for a wide range of mission-critical, high performance applications that are exposed to strong interference sources such as multi-carrier GSM, 4G LTE and LTE-Advanced multimode basestations, point-to-point backhauls, military communications, wireless repeaters, public safety radios, VHF/UHF/white-space broadcast receivers, radar and avionics.The LTC5551 comes in a 4mm x 4mm QFN that is specified over -40°C to 105°C and is priced starting at $7.25 each in 1,000-piece quantities.

The LTM8001 is a step-down µModule regulator consisting of an array of five low noise 1A linear regulators. The linear regulators are also configurable to deliver 2A, 3A, 4A or 5A, depending on the number and combination of current shared outputs. Housed in a 15mm x 15mm x 3.42mm ball grid array (BGA) package, the LTM8001 provides high efficiency conversion from an input source, ranging from 6V to 36V, by powering the five low noise linear regulators from an onboard synchronous step-down converter. Each output voltage is adjustable from 0V to 24V. The LTM8001 is designed to supply multirail systems based on FPGAs, DSPs, ASICs and microprocessors.Each of the LTM8001's five linear regulars has an adjustable output voltage ranging from 0V to 24V with ±2% accuracy over temperature. Output noise is just 90µVRMS over the 10Hz to 1MHz frequency range. The step-down regulator features a user-adjustable current limit accurate within ±10%.The LTM8001 is available with guaranteed operation over the -40°C to +125°C and -55°C to +125°C internal temperature range. Pricing starts at $17.40 each for 1,000 piece quantities.

The LT3514 is a triple output, 36V step-down switching regulator with 100% duty cycle operation. It delivers 2A of continuous output current from one channel and 1A each from the other two channels at voltages as low as 0.8V. The device's 3.2V to 36V (40VMAX) input voltage range makes it ideal for automotive and industrial applications that require multiple outputs. The unique design includes an onboard boost regulator enabling each channel to operate at 100% duty cycle even with input voltage as low as 3.2V. This architecture makes the LT3514 well suited for applications requiring continuous output regulation such as automotive cold-crank and stop-start scenarios. The switching frequency is user-programmable from 250kHz to 2.2MHz and is synchronizable throughout the range, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 28-lead 4mm x 5mm QFN package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint for multiple output applications.This device utilises one internal 3A switch and two 1.45A switches for the step-down conversion and a 220mA switch for the internal boost circuit, with the necessary oscillator, control and logic circuitry integrated into a single die. Special design techniques deliver efficiencies up to 88% over a wide input voltage range and the current mode topology enables fast transient response and excellent loop stability. Anti-phase switching reduces input ripple and robust short-circuit protection enhances system reliability. The LT3514 is available in QFN-28 and TSSOP-24 packages and is priced starting at $3.50 each for 1,000-piece quantities. The industrial version operates from -40°C to 125°C and is priced starting at $3.85 each.

The LTM4641 is a 4.5V to 38V input, 0.6V to 6V output, 10A step-down µModule regulator with comprehensive electrical and thermal protection for loads such as processors, ASICs and high-end FPGAs. This regulator monitors input voltage, output voltage and temperature conditions. If any user-adjustable trip thresholds are exceeded it responds quickly within 500ns in the case of an output overvoltage fault, ceasing operation, and if necessary, activating external switches. One switch disconnects the input supply rail while the other discharges the output capacitors to protect the load. Additionally, when any trip threshold is exceeded, the LTM4641 will issue a logic level fault signal which may be used to initiate an orderly emergency shutdown sequence in the system. The adjustable trip thresholds are accurate to within ±2.7% over the full operating temperature range. The LTM4641 includes power MOSFETs, DC/DC controller, inductor, compensation and the protection logic circuits in a compact surface mount BGA package. It is designed for point-of-load regulation in robotics and industrial instrumentation, as well as rugged environments such as defense and avionics systems.When any trip threshold is exceeded, the LTM4641's protection circuitry classifies the fault as latching or non-latching. Normal voltage regulation will automatically resume once a non-latching fault has cleared. For latching faults the system must cycle the input power or supply a logic level signal to the LTM4641 in order to resume normal operation. The LTM4641 is packaged in a thermally efficient RoHS compliant 15mm x 15mm x 5.01mm BGA with guaranteed operation over -40°C to +125°C (E-grade and I-grade) or -55°C to +125°C (MP-grade). Pricing starts at $25.95 each for 1,000-piece quantities.

The LT3081 is a rugged 1.5A wide input voltage range linear regulator with key usability, monitoring and protection features. It has an extended safe operating area (SOA) compared to existing regulators, making it ideal for high input-to-output voltage and high output current applications where older regulators limit the output. This device uses a current source reference for single resistor output voltage settings and output adjustability down to "0." Output current limit can be set externally with a single resistor. This architecture, combined with low millivolt regulation, enables multiple ICs to be paralleled easily for heat spreading and higher output current. The current from the device's current monitor can be summed with the set current for line-drop compensation where the output of the LT3081 increases with current to compensate for line drops.The LT3081 achieves unmatched line and load regulation of under 2mV independent of output voltage and features an input voltage range from 1.2V to 40V. The device fits well in applications requiring multiple rails. Output voltage is programmable with a single resistor from 0V to 38.5V with a 1.2V dropout. The on-chip trimmed 50µA current reference is ±1% accurate. The regulation, transient response and output noise (30µVrms) are independent of output voltage due to the device's voltage follower architecture. The LT3081 is configurable as a 2-terminal current source with just two resistors. Input or output capacitors for stability are optional in either linear regulator or current-source mode of operation.The LT3081 is offered in a variety of thermally enhanced surface-mount compatible packages, all dissipate 2W in surface mount applications with no heat sink. A wide variety of grades/temperature ranges are also offered and 1,000-piece pricing starts at $2.60 each.

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 LT3504 is a quad 1A output, 40V step-down switching regulator with 100% duty cycle operation. Its 3.2V to 40V input voltage range makes it ideal for automotive and industrial applications that require multiple outputs. The internal 1.5A switches can deliver up to 1A of continuous output current per channel to voltages as low as 0.8V. The LT3504's unique design includes an onboard boost regulator, enabling each channel to operate at 100% duty cycle, even with input voltage as low as 3.2V. This architecture makes the LT3504 well suited for applications requiring continuous output regulation, such as automotive cold-crank and stop-start scenarios. Switching frequency is user-programmable from 250kHz to 2.2MHz and synchronizable throughout the range, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 28-lead 4mm x 5mm QFN and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint for multiple output applications.The LT3504 utilises four internal 1.5A switches for the step-down conversion and a 220mA switch for the internal boost circuit, with the necessary oscillator, control and logic circuitry integrated into a single die. Special design techniques and a new high voltage process deliver efficiencies up to 88% over a wide input voltage range, while the LT3504's current mode topology enables fast transient response and excellent loop stability. Anti-phase switching reduces input ripple and robust short-circuit protection enhances system reliability. The LT3504 E-grade is priced starting at $3.50 each while the I-grade version is tested and guaranteed to operate from a -40°C to 125°C and priced at $3.85 each in 1,000-piece quantities.