LINEAR Manuals

The LT ®1950 is a wide input range, single switch PWM controller that drives an N-channel power MOSFET with few external components required.

LTC1645 1645fa Dual-Channel Hot Swap Controller/Power Sequencer

The LT ®1765 is a monolithic buck switching regulator from Texas Instruments. It integrates a high efficiency 3A, 0.09Ω switch and all the control circuitry required to construct a high frequency, current mode switching regulator. The chip can operate at a wide input voltage range of 3V to 25V and output a maximum current of 3A.

LTC2926 is a MOSFET-controlled power supply tracker that allows tracking and sequencing of up to three power supply rails. It features adjustable ramp rates, offsets, and time delays, and automatic remote sense switching to compensate for voltage drops across the MOSFETs. The product is suitable for VCORE and VI/O supply tracking, microprocessor, DSP and FPGA supplies, servers, communication systems, etc.

The LTC3717 is a synchronous step-down switching regulator controller from Texas Instruments for DDR and QDR memory termination. 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. Forced continuous operation reduces noise and RF interference. Output voltage is internally set to half of VREF, which is user programmable. Fault protection is provided by an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished by internally compensating VIN's variation with switching frequency.

The LTC4556 provides all necessary power control, level translation and supervisory functions for a smart card or S.A.M. card interface. The part contains a low noise charge pump plus LDO for generating VCC power, as well as all necessary level shifting circuitry. The card voltage can be set to either 1.8V, 3V or 5V. The LTC4556 includes a card detection channel with automatic debounce circuitry. To reduce wiring costs, the LTC4556 interfaces to a microcontroller via a simple 4-wire serial interface. Multiple devices may be connected in daisy-chain fashion so that the number of wires to the card socket board is independent of the number of sockets. Status data is returned over the same interface. Extensive security features ensure proper deactivation sequencing in the event of a supply fault or a smart card electrical fault. The smart card pins can withstand greater than 10kV ESD in-situ with no additional components. The LTC4556 is available in a small, low profile (0.75mm), 4mm × 4mm QFN package.

LTC1628/LTC1628-PG are high efficiency dual 5V/3.3V step-down converters with various features such as high efficiency, 2-phase synchronous switching regulators, output voltage accuracy, dual N-channel MOSFET synchronous drive, power good output voltage monitor, adjustable soft-start current ramping, etc.

LTC3713 is a low input voltage, high power, no current sense synchronous buck DC/DC controller. It features adjustable current limit, adjustable frequency, 0.8V ±1% reference voltage, etc. It is suitable for applications such as telecom cards and bus termination.

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.

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 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 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.

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

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.

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