LINEAR Manuals

The LT ®3724 is a DC/DC controller used for medium power, low part count, low cost, high efficiency supplies. It offers a wide 4V-60V input range (7.5V minimum startup voltage) and can implement step-down, step-up, inverting and SEPIC topologies. The LT3724 includes Burst Mode operation, which reduces quiescent current below 100µA.

The LTC1873 is a dual switching regulator controller optimized for high efficiency with low input voltages

The LT3014 is a high voltage, micropower low dropout linear regulator from National Semiconductor. The device is capable of supplying 20mA of output current with a dropout voltage of 350mV. Designed for use in battery-powered or high voltage systems, the low quiescent current (7µA operating and 1µA in shutdown) makes the LT3014 an ideal choice. Quiescent current is also well controlled in dropout. Other features of the LT3014 include the ability to operate with very small output capacitors. The regulators are stable with only 0.47µF on the output while most older devices require between 10µF and 100µF for stability. Small ceramic capacitors can be used without the necessary addition of ESR as is common with other regulators. Internal protec- tion circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection. The device is available as an adjustable device with a 1.22V reference voltage. The LT3014 regulator is available in the 5-lead ThinSOT and 8-lead DFN packages.

The LT3750 is a flyback converter designed to rapidly charge large capacitors to a user-adjustable target voltage.

This document introduces the features and characteristics of the LT1086 series products, including 3-terminal adjustable or fixed voltage, 1.5A output current, 1V input-output differential, multiple current levels guaranteed dropout voltage, 0.015% line regulation, 0.1% load regulation, 100% thermal limit functional test,> 75dB ripple rejection, etc.

The LTC6800 is a precision instrumentation amplifier with high CMRR and low input offset voltage. It uses charge balanced sampled data techniques to convert a differential input voltage into a single ended signal, which is then amplified by a zero-drift operational amplifier. The inputs and outputs are both rail-to-rail, making it suitable for applications such as thermocouple amplifiers, electronic scales, medical instrumentation, strain gauge amplifiers, and high resolution data acquisition.

The LTC3704 is a wide input range, current mode, positive-to-negative DC/DC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to high power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maxi- mizing efficiency.

The LT1737 is a monolithic switching regulator controller specifically designed for the isolated flyback topology. It drives the gate of an external MOSFET and is generally powered from a DC supply voltage. Output voltage feedback information may be supplied by a variety of methods including a third transformer winding, the primary winding or even direct DC feedback (see Applications Information). Its gate drive capability, coupled with a suitable external MOSFET and other power path components, can deliver load power up to tens of Watts. The LT1737 has a number of features not found on other isolated flyback controller ICs. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a soft-start function.

The LT ®1635 is a new analog building block that includes a rail-to-rail output op amp, a precision reference and reference buffer. The device operates from supplies as low as a single 1.2V or up to ±5V, yet it consumes only 130µA of supply current. The input common mode range of the op amp includes ground and incorporates phase reversal protection to pre- vent false outputs from occurring when the input is below the negative supply. The rail-to-rail output stage can swing to within 15mV of each rail with no load and can swing to within 250mV of each rail while delivering 10mA of output current. The gain bandwidth of the op amp is 175kHz and it is unity- gain stable with up to 1000pF load capacitance. The 0.2V reference is referred to V– and includes a buffer amplifier to enhance flexibility. The reference and buffer combine to achieve a drift of 30ppm/°C, a line regulation of 20ppm/V and a load regulation of 150ppm/mA. The LT1635 is available in 8-pin PDIP and SO packages, and has the industry standard LM10 pinout.

The LT ®1316 is a micropower step-up DC/DC converter that operates from an input voltage as low as 1.5V. A programmable input current limiting function allows pre- cise control of peak switch current. Peak switch current can be set to any value between 30mA and 500mA by adjusting one resistor. This is particularly useful for DC/DC converters operating from high source impedance inputs such as lithium coin cells or telephone lines. The fixed off-time, variable on-time regulation scheme results in quiescent current of only 33µA in active mode. Quiescent current decreases to 3µA in shutdown with the low-battery detector still active. The LT1316 is available in 8-lead MSOP and SO packages.

The LTC1745 is a low noise, 12-bit, 25Msps ADC with selectable input ranges, low power dissipation, and high performance. It is suitable for applications such as telecommunications, medical imaging, receivers, cellular base stations, spectrum analysis, and imaging systems.

The LTC3736 is a 2-phase dual synchronous step-down switching regulator controller with tracking that drives external complementary power MOSFETs using few exter- nal components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are significantly reduced.

The LT1158 is a half-bridge N-channel power MOSFET driver that drives the gate of the top MOSFET above V+. It operates at supply voltages from 5V to 30V, with 150ns transition times driving 3000pF. It has a peak driver current of over 500mA, adaptive non-overlap gate drives, continuous current limit protection, automatic shutdown and retry capability, a built-in charge pump for DC operation, built-in gate voltage protection, and is compatible with current-sensing MOSFETs. It has TTL/CMOS input levels and a fault output indication.

The LTC1325 is a microprocessor-controlled battery management system that features fast charging, flexible current regulation, battery voltage, temperature, and charge time fault protection, etc.

This is a 1.25MHz step-down switching regulator with high efficiency, low dropout voltage and low static current