LINEAR Manuals

The LT®1777 is a Buck (step-down) regulator designed for noise sensitive applications. It contains a dI/dt limiting circuit programmed via a small external inductor in the switching path. Internal circuitry also generates controlled dV/dt ramp rates. The monolithic die includes all oscillator, control and protection circuitry. The part can accept operating input voltages as high as 48V, and contains an output switch rated at 700mA peak current. Current mode control offers excellent dynamic input supply rejection and short-circuit protection. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply (see Applications Informa- tion). The fused-lead SO16 package and 100kHz switch- ing frequency allow for minimal PC board area requirements.

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The LTC1704/LTC1704B is a high power synchronous switching regulator controller with high efficiency and low power consumption, suitable for a variety of applications.

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The LTC1257 is a complete single supply, 12-bit voltage output digital-to-analog converter (DAC) in an SO-8 package. It includes an output buffer amplifier, 2.048V voltage reference, and an easy to use three-wire cascadable serial interface. It is suitable for industrial process control and automatic test equipment. The LTC1257 features small size, low power consumption, and other characteristics.

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The document mainly introduces the LTC3832/LTC3832-1 series products. The series products are high power and high efficiency switching regulator controllers, which can be used for 3.3V-5V to 0.6V-3.xV step-down applications. The series products have ±1% output voltage regulation accuracy and can maintain stability under temperature, load current and input voltage changes. The efficiency is up to 95%. It can provide adjustable or fixed 2.5V output.

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The LTC1255 is a dual 24V high-side MOSFET driver that allows using low cost N-channel FETs for high-side industrial and automotive switching applications. An internal charge pump boosts the gate drive voltage above the positive rail, fully enhancing an N-channel MOS switch with no external components. Low power operation, with 12µA standby current, allows use in virtually all systems with maximum efficiency. Included on-chip is independent overcurrent sensing to provide automatic shutdown in case of short circuits. A time delay can be added to the current sense to prevent false triggering on high in-rush current loads. The LTC1255 operates from 9V to 24V supplies and is well suited for industrial and automotive applications. The LTC1255 is available in both an 8-pin DIP and an 8-pin SOIC.

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This document introduces the LT1616 600mA, 1.4MHz step-down switching regulator, which uses an internal 0.6A power switch and is packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 25V makes the LT1616 suitable for regulating a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors. With its internal compensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches of PC board area. The constant frequency current mode PWM architecture and stable operation with ceramic capacitors results in low, predictable output ripple. Current limiting provides protection against shorted outputs. The low current (<1µA) shutdown provides complete output disconnect, enabling easy power management in battery-powered systems.

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LTC1091/LTC1092/LTC1093/LTC1094 1-, 2-, 6- and 8-channel, 10-bit serial I/O data acquisition systems I Programmable features – unipolar/bipolar conversions – differential/single-ended multiplexer configurations I sample-and-holds I single supply 5V, 10V or ±5V operation I direct 3- or 4-wire interface to most MPU serial ports and all MPU parallel I/O ports I analog inputs common mode to supply rails I resolution: 10 bits I total unadjusted error (A grade): ±1LSB over temp I fast conversion time: 20µs I low supply current LTC1091: 3.5mA max, 1.5mA typ LTC1092/LTC1093/LTC1094: 2.5mA max, 1mA typ

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The LTC1154 is a high-side micropower MOSFET driver that allows using low cost N-channel FETs for high-side switching applications. It features 8µA IQ standby current, 85µA IQ ON current, no external charge pump capacitors, 4.5V to 18V supply range, short-circuit protection, thermal shutdown via PTC thermistor, status output indicates shutdown, and is available in 8-pin SOIC package.

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LTC3421/3421f is a low-power synchronous boost converter with a maximum operating frequency of 3MHz. The input voltage range is 0.5V~4.5V, and the output voltage range is 2.4V~5.25V. It has synchronous rectification, output disconnect, inrush current limiting, low quiescent current, high efficiency, programmable current limit, programmable soft start, synchronous oscillator, manual or automatic burst mode, low battery comparator and other characteristics.

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The LTC3714 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 0.6V and 1.75V is selected by a 5-bit code (Intel mobile VID specification). The controller uses a constant on-time, valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated by a compensation capacitor. The device offers a fast switching rate and is stable in high input voltage ranges. It also features good protection in short circuit conditions.

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The LTC1594/LTC1598 are micropower, 12-bit sampling A/D converters that feature 4- and 8-channel multiplexers, respectively. They typically draw only 320µA of supply current when converting and automatically power down to a typical supply current of 1nA between conversions. The LTC1594 is available in a 16-pin SO package and the LTC1598 is packaged in a 24-pin SSOP. Both operate on a 5V supply. The 12-bit, switched-capacitor, successive approximation ADCs include a sample-and-hold. On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three or four wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers. The circuit can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to 1.5V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.

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LT2078/LT2079 are low-power dual and quad single supply precision op amps. Its features are low power consumption, large output current, large output swing.

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The LTC ®2436-1 is a 2-channel differential input micropower 16-bit No Latency ∆Σ TM analog-to-digital converter with an integrated oscillator. It provides 0.5 LSB INL and 800 nV RMS noise independent of VREF. The two differential channels convert alternately with a channel identification included in the conversion result. It uses delta-sigma technology and provides single conversion settling of the digital filter. Through a single pin, the LTC2436-1 can be configured for better than 87dB input differential mode rejection at 50Hz and 60Hz ±2%, or it can be driven by an external oscillator for a user defined rejection frequency. The internal oscillator requires no external frequency setting components. The converter accepts any external differential reference voltage from 0.1V to VCC for flexible ratiometric and remote sensing measurement configurations. The full-scale differential input range is from –0.5 •␣VREF to 0.5 • VREF. The reference common mode voltage, VREFCM, and the input common mode voltage, VINCM, may be independently set anywhere between GND and VCC. The DC common mode input rejection is better than 140dB. The LTC2436-1 communicates through a flexible 3-wire digital interface which is compatible with SPI and MICROWIRE TM protocols.

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The LTC4267 is a combination of an IEEE 802.3af compliant PoE PD interface with an integrated switching regulator, providing a complete power solution for PD applications.

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The LTC ®3780 is a high performance buck-boost switch- ing regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phase- lockable frequency of up to 400kHz.

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The LTC3778 is a synchronous step-down switching regulator controller for computer memory, automobile and other DC/DC power supplies. The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT. Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference, and can assist secondary winding regulation when the main output is lightly loaded. SENSE+ and SENSE– pins provide true Kelvin sensing across the optional sense resistor or the sychronous MOSFET. Fault protection includes overcurrent protection, overvoltage protection, thermal shutdown and short-circuit protection.

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The LT3510 is a dual current mode PWM step-down DC/DC converter with two internal 2.5A switches. It supports a wide input voltage range of 3.1V to 25V and has independent power supply inputs, feedback, soft-start and power good pins.

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The LTC ®3709 is a single output, dual phase, synchronous step-down switching regulator that offers high efficiency and low power consumption.

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The LTC1530 is a high power synchronous switching regulator controller optimized for 5V to 1.3V-3.5V output applications. Its synchronous switching architecture drives two external N-channel MOSFET devices to provide high efficiency. The LTC1530 contains a precision trimmed reference and feedback system that provides worst-case output voltage regulation of ±2% over temperature, load current and line voltage shifts. Current limit circuitry senses the output current through the on-resistance of the topside N-channel MOSFET, providing an adjustable current limit without requiring an external low value sense resistor. The LTC1530 includes a fixed frequency PWM oscillator that free runs at 300kHz, providing greater than 90% efficiency in converter designs from 1A to 20A of output current. Shutdown mode drops the LTC1530 supply current to 45µA. The LTC1530 is specified for commercial and industrial temperature ranges and is available in the S0-8 package.

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