LINEAR Manuals

The LT6106 is a versatile high side current sense amplifier with features such as low cost, high accuracy, and wide input voltage range. It is suitable for automotive, industrial, and power management applications.

LTC6652 is a precision, low drift, low noise buffered reference from LTC. It features an accuracy of ±0.05% and a temperature drift of less than 5ppm/°C, making it an ideal choice for automotive and high temperature applications.

The LT®1761 series are micropower, low noise, low dropout regulators that provide 100mA of output current in SOT-23 packages. The series features 20µVRMS of low noise, 20µA of low quiescent current, a wide input voltage range of 1.8V to 20V, 300mV of low dropout, and <0.1µA of extremely low shutdown current. Fixed output voltages are available at 1.2V, 1.5V, 1.8V, 2V, 2.5V, 2.8V, 3V, 3.3V, and 5V. Adjustable output voltage ranges from 1.22V to 20V. The series is stable with 1µF of output capacitance and operates with aluminum, tantalum, or ceramic capacitors. The series provides reverse battery protection, no reverse current, no need for protection diodes, and overcurrent and overtemperature protection. The series is available in a tiny 5-lead SOT-23 package.

LT3013 is a high voltage, micropower low dropout linear regulator. The device is capable of supplying 250mA of output current with a dropout voltage of 400mV. Designed for use in battery-powered or high voltage systems, the low quiescent current (65μA operating and 1μA in shutdown) makes the LT3013 an ideal choice. Quiescent current is also well controlled in dropout. Other features of the LT3013 include a PWRGD flag to indicate output regulation. The delay between regulated output level and flag indication is programmable with a single capacitor. The LT3013 also has the ability to operate with very small output capacitors. The regulator is stable with only 3.3μF on the output while most older devices require between 10μF and 100μF for stability. Small ceramic capacitors can be used without any need for series resistance (ESR) as is common with other regulators. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection. The device is available with an adjustable output with a 1.24V reference voltage. The LT3013 regulator is available in the thermally enhanced 16-lead TSSOP and the low profile (0.75mm), 12-pin (4mm × 3mm) DFN package, both providing excellent thermal characteristics.

The LT1939 is a current mode PWM step-down DC/DC converter with an internal 2.3A switch. It is suitable for regulating power from a wide variety of sources (including automotive batteries, industrial supplies, and unregulated wall adapters). The adjustable/synchronizable fixed frequency operation from 250kHz to 2.2MHz allows for optimization between efficiency and external component size. It provides protection against a shorted output through cycle-by-cycle current limit, frequency foldback, and thermal shutdown. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, and also provides output tracking. The LT1939 contains an internal NPN transistor with feedback control which can be configured as a linear regulator or as a linear regulator controller. Its low current shutdown mode (<12μA) enables easy power management in battery-powered systems.

The LT3470 is a micropower step-down DC/DC converter that integrates a 300mA power switch, catch diode and boost diode into low profile 3mm x 2mm DD and ThinSOT packages. The LT3470 combines Burst Mode and continuous operation to allow the use of tiny inductor and capacitors while providing a low ripple output to loads of up to 200mA. With its wide input range of 4V to 40V, the LT3470 can regulate a wide variety of power sources, from 2-cell Li-Ion batteries to unregulated wall transformers and lead- acid batteries. Quiescent current in regulation is just 26µA in a typical application while a zero current shutdown mode disconnects the load from the input source, simpli- fying power management in battery-powered systems.

The LTM4600 is a high-efficiency DC/DC µModule with a 10A output current and an output voltage range of 0.6V to 5V. It features a high-efficiency design that does not require heat sinks or airflow to meet power specifications, and it has a fast transient response and fault protection features.

The LTC2053 is a high precision instrumentation amplifier with adjustable gain, low offset voltage, and small temperature drift. It is suitable for applications such as thermocouple amplifiers, electronic scales, and medical instrumentation.

The LT1934/LT1934-1 is a micropower step-down DC/DC converter with internal 400mA power switch, packaged in a low profile (1mm) ThinSOT. With its wide input range of 3.2V to 34V, the LT1934 can regulate a wide variety of power sources, from 4-cell alkaline batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Quiescent current is just 12μA and a zero current shut- down mode disconnects the load from the input source, simplifying power management in battery-powered sys- tems. Burst Mode® operation and the low drop internal power switch result in high efficiency over a broad range of load current. The LT1934 provides up to 300mA of output current. The LT1934-1 has a lower current limit, allowing optimum choice of external components when the required output current is less than 60mA. Fast current limiting protects the LT1934 and external components against shorted outputs, even at 34V input.

The LTC3531/LTC3531-3.3/LTC3531-3 are synchronous buck-boost DC/DC converters that operate from input voltages above, below or equal to the output voltage. The topology incorporated in the ICs provides a continuous transfer through all operating modes, making the product ideal for single cell Li-Ion and multicell alkaline or nickel applications. The converters operate in Burst Mode, minimizing solution footprint and component count as well as providing high conversion efficiency over a wide range of load currents. The devices include two 0.5Ω N-channel MOSFET switches and two P-channel switches (0.5Ω, 0.8Ω). Quiescent current is typically 16μA, making the parts ideal for battery power applications. Other features include a <1μA shutdown current, current limiting, thermal shutdown and output disconnect. The parts are offered in a 6-pin ThinSOTTM package for fixed voltage versions or a 3mm × 3mm DFN package for fixed and adjustable versions.

LT6011/LT6012 is a low noise, high precision input performance, low power and wide power supply voltage range op amp, which can be applied to thermocouple amplifiers, precision photodiode amplifiers, instrumentation amplifiers, low voltage precision systems and battery powered precision systems.

LT1573 is a low cost, high current, low dropout, fast transient response regulator driver IC that can be used with an external PNP power transistor to provide up to 5A of current with a dropout voltage as low as 0.35V. The device is designed for extremely fast transient response. This greatly reduces bulk storage capacitance when the regulator is used in applications with fast, high current load transients. To keep cost and complexity low, the LT1573 uses a new time-delayed latching overcurrent protection technique that requires no external current sense resistor. Base drive is limited for instantaneous protection, and a time-delayed latch protects the regulator from continuous short circuits. The LT1573 is available in both adjustable and fixed versions with a operating voltage range of 2.8V to 10V.

The LTC ®1960 is a highly integrated battery charger and selector intended for portable products using dual smart batteries. A serial SPI interface allows an external microcontroller to control and monitor status of both batteries. A proprietary PowerPath architecture supports simultaneous charging or discharging of both batteries. Typical battery run times are extended by 10%, while charging times are reduced by up to 50%. The LTC1960 automati cally switches between power sources in less than 10µs to prevent power interruption upon battery or wall adapter removal. The synchronous buck battery charger delivers 95% efficiency with only 0.5V dropout voltage, and prevents audible noise in all operating modes. Patented* input current limiting with 5% accuracy charges batteries in the shortest possible time without overloading the wall adapter. The LTC1960’s 5mm × 7mm 38-pin QFN and 36-pin narrow SSOP packages allow implementation of a complete SBS-compliant dual battery system while consum ing minimum PCB area.

The LTC3125 is a high effi ciency, synchronous step-up DC/DC converter with an accurate programmable average input current limit. The ±5% accurate average input current is resistor programmable and suitable for a wide variety of applications. In mobile computing, GSM and GPRS cards demand high current pulses well beyond the capability of the PC Card and CompactFlash slots. The LTC3125 in concert with a reservoir capacitor, keeps the slot power safely within its capabilities providing a high performance and simple solution. Synchronous rectifi cation produces high effi ciency while the 1.6MHz switching frequency minimizes the solution footprint. The current mode PWM design is internally com- pensated. Output disconnect allows the load to discharge in shutdown, while also providing inrush current limiting. Other features include a <1μA shutdown current, short- circuit and thermal overload protection. The LTC3125 is of- fered in a low profi le 0.75mm × 2mm × 3mm package.

LTC3901 is an N-channel synchronous MOSFET driver with features such as programmable timeout, reverse inductor current sense, gate drive transformer synchronization sequence monitor, etc. It is designed for use in isolated push-pull and full-bridge converter power supplies. It provides a full range of protection features, including timeout function, inductor current reversal detection, undervoltage lockout, etc.