LINEAR Manuals

The LTC1569-7 is a 10th order lowpass filter featuring linear phase and a root raised cosine amplitude response. The high selectivity of the LTC1569-7 combined with its linear phase in the passband makes it suitable for filtering both in data communications and data acquisition sytems.

LT3485-0/LT3485-1/LT3485-2/LT3485-3 are photoflash capacitor chargers with output voltage monitor and integrated IGBT drive.

The LT138A/LT338A series of adjustable regulators provide 5A output current over an output voltage range of 1.2V to 32V. The internal voltage reference is trimmed to less than 1%, enabling a very tight output voltage. In addition to excel- lent line and load regulation, with full overload protection, the LT138A incorporates new current limiting circuitry allowing large transient load currents to be handled for short periods. Transient load currents of up to 12A can be supplied without limiting, eliminating the need for a large output capacitor. The LT138A is an improved version of the popular LM138 with improved circuit design and advanced process tech- niques to provide superior performance and reliability.

The LT1680 is a high power, current mode switching power supply controller optimized for boost topologies. The IC drives N-channel MOSFET switches for DC/DC converters in applications up to 60V input. A high current gate drive output handles up to 10,000pF gate capacitance, enabling the construction of high power DC/DC converters. Current sense common mode range up to 60V allows current sensing to be referenced to the input supply, eliminating the need for sense blanking circuits. The LT1680 incorporates programmable average current limiting allowing accurate limiting of DC current in the magnetics, independent of ripple current. User adjustable slope compensation provides stable operation at duty cycles up to 90%. The LT1680 operating frequency is programmable and can be synchronized up to 200kHz. Minimum off-time operation provides switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions.

The LT ®1494/LT1495/LT1496 are the lowest power (IS ≤ 1.5µA) op amps with precision specifications. The extremely low supply current is combined with excellent amplifier specifications: input offset voltage is 375µV maximum with a typical drift of only 0.4µV/°C, input offset current is 100pA maximum. A minimum open-loop gain (AVOL) of 100V/mV ensures that gain errors are small. The device characteristics change little over the supply range of 2.2V to ±15V. Supply rejection is 90dB and the common mode rejection ratio is 90dB. Operation is specified for 3V, 5V and ±15V supplies. Reverse battery protection (–18V␣min) and inputs that operate above the positive supply make the LT1494/LT1495/LT1496 easy to use in harsh environments. The low bias currents and offset current of the amplifier permit the use of megohm level source resistors without introducing significant errors.

4- and 8-Channel, 3V Micropower Sampling 12-Bit Serial I/O A/D Converters

The LT1078/LT1079 are Texas Instruments' micropower dual- and quad-channel single-supply precision op amps, with a maximum supply current of 50µA and a low voltage noise of 0.6µVP-P, 0.1Hz to 10Hz.

The LTC4241 is a Hot Swap controller that allows a board to be safely inserted and removed from a live PCI-bus slot.

The LT®3845 is a high voltage, synchronous, current mode controller used for medium to high power, high effi ciency supplies. It offers a wide 4V to 60V input range (7.5V minimum start-up voltage). An onboard regulator simplifi es the biasing requirements by providing IC power directly from VIN. Burst Mode® operation maintains high effi ciency at light loads by reducing IC quiescent current to 120μA. Light load effi ciency is also improved with the reverse inductor current inhibit function which supports discontinuous operation. Additional features include adjustable fi xed operating frequency that can be synchronized to an external clock for noise sensitive applications, gate drivers capable of driving large N-channel MOSFETs, a precision undervoltage lockout, 10μA shutdown current, short-circuit protection and a programmable soft-start. The LT3845 is available in a 16-lead thermally enhanced TSSOP package.

LT1461 family of low dropout micropower bandgap references combine very high accuracy and low drift with low supply current and high output drive.

The LT1720/LT1721 are single supply 3V/5V comparators with 4.5ns response time and rail-to-rail outputs, making them well suited for TTL and CMOS circuits.

The LT3800 is a high-voltage synchronous current mode step-down controller with a fixed frequency of 200kHz. It can drive standard gate N-channel power MOSFETs and operate with input voltages from 4V to 60V.

The LTC4054-4.2/LTC4054X-4.2 is a standalone linear Li-Ion battery charger with thermal regulation in ThinSOT from Linear Technology Corporation. It features programmable charge current up to 800mA, no external MOSFET, sense resistor or blocking diode required, and a complete linear charger in ThinSOT package for single cell lithium-ion batteries.

The LT1220 is a high performance high speed operational amplifier with high input impedance, low input bias current, high gain bandwidth and high output swing. The device is suitable for a variety of applications requiring high precision and high speed, such as data acquisition systems, buffers, cable drivers, etc.