LINEAR Manuals

This datasheet provides the features and characteristics of the LT1331. The LT1331 is a 3-driver, 5-receiver RS232 transceiver designed for 3V and mixed 3V/5V systems. Receivers operate from 3V logic supply VL, while the onboard charge pump and drivers operate from 5V or 3V supply VCC. The transceiver has two shutdown modes. One mode disables the drivers and the charge pump, the other shuts down all circuitry except for one low power receiver which can be used for ring detection. The VCC supply may be shut down while in ring detection mode. While shut down, the drivers and receivers assume high impedance output states. When VCC = 5V, the LT1331 is fully compliant with all EIA-RS232 specifications. If VCC = 3V, output drive levels are compatible with all known interface circuits. Special bipolar construction techniques protect the drivers and receivers beyond the fault conditions stipulated for RS232. The RS232 I/O pins are resilient to multiple ±10kV ESD strikes. An advanced driver output stage operates up to 120kbaud while driving heavy capacitive loads.

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LT1002 is a dual-channel, high-precision operational amplifier suitable for thermocouple amplifiers, strain gauge amplifiers, low-level signal processing, medical instrumentation, etc. It features low offset voltage, low drift, high common mode rejection ratio, and high channel separation.

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This document introduces the LTC4413 dual monolithic ideal diode, which helps to reduce the size and improve the performance and reliability of handheld battery-operated devices. The device can automatically select and isolate up to three power sources, such as a wall adapter, an auxiliary supply and a battery. It provides a low loss automatic PowerPath TM management solution for demanding applications that may require short-circuit protection, thermal management and system-level power management and control. The LTC4413 contains two isolated low voltage (2.5V to 5.5V) monolithic ideal diodes. Each ideal diode channel provides a low forward voltage drop (typically as low as 40mV when conducting low current) and a low RDS(ON) (below 100mΩ) when conducting high current—features that are important to extend battery life and reduce heat in portable applications. Furthermore, each channel is capable of providing up to 2.6A of continuous current from a small 3mm × 3mm, 10-pin DFN package. Current-limit and thermal shutdown features further enhance system reliability.

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This document introduces the working principle of the LTC1421 hot swap circuit, which can safely insert or remove the circuit board when the power is on.

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This document introduces a high input voltage monolithic switcher that can perform both step-up and step-down functions using a single inductor. The module has a wide input voltage range and precise output voltage control. It features constant frequency and current mode architecture, high efficiency, and low power consumption.

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This document introduces a dual output DC/DC converter solution for powering Xilinx FPGAs. The solution uses Linear Technology's LTC3860 and LTC3861 dual channel voltage regulators to provide 1.2V to 5V core voltage and 1.2V to 3.3V I/O voltage to the FPGA.

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This article introduces the LT6011 dual operational amplifier, which features 25µV input precision, micropower operation, and a wide 2.7V to 36V supply range. It is housed in a tiny 3mm × 3mm DFN package, enabling picoampere input currents and rail-to-rail output swing.

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The LTC3425 is a 4-phase monolithic synchronous boost converter with an output voltage range of 2.4V to 5.25V, making it well suited for battery-powered applications as well as point-of-load regulation in low voltage systems. The device has a peak current capability of 5A and an effective switch RDS(ON) of 40mΩ (NMOS) and 50mΩ (PMOS), and is capable of efficiently delivering 2.5A load current from a 0.8mm maximum profile, 32-pin 5mm × 5mm QFN package.

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LTC1992 is a differential amplifier with fixed gain versions and variable gain versions

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This article presents some solutions using Linear Technology’s versatile family of high frequency Schottky diode detectors for RF power detection and control

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This document describes a simple design for a multiple output range 16-bit DAC. The product is suitable for industrial process control equipment, analytical and scientific instruments, and automatic test equipment. With the new LTC®1592 multiple output range DAC, all standard industrial ranges can be accurately and software-configurably outputted.

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This document is about the design note of LTC1966, introduces the features and characteristics of LTC1966

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This article introduces a DC/DC converter for driving Lumileds white LEDs from a variety of power sources. The converter combines a traditional voltage feedback loop and a unique current feedback loop to operate as a constant-voltage, constant-current DC/DC converter. No external op amps are required, saving cost and space.

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This design note describes a dual smart battery charger for use in server battery backup. The circuit can charge batteries at up to 4A and switch continuously down to zero load currents. The circuit takes advantage of ceramic capacitors’ space saving features without sacrificing circuit performance.

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This design note presents a simple, compact, and high efficiency LED flashlamp circuit suitable for use in cellular telephones and cameras. The circuit uses the LT ®3468-1 as the main controller.

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The LT1991 is a flexible part that can be configured into inverting, noninverting, difference amplifiers, and even buffered attenuators, just by strapping its pins. It provides you with internal precisely matched resistors and feedback capacitors, so you can easily configure it into hundreds of different gain circuits without external components.

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This document introduces a high power LED camera flash solution for cell phone applications. The solution uses LED flash lights, which are small and efficient, and can meet the various needs of cell phones for flash lights.

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The LT ®1943 is a highly integrated, 4-output regulator designed to power large TFT LCD panels. It employs switching regulators—instead of linear regulators—to minimize power dissipation and accommodate a wide input voltage range. The wide input range, 4.5V to 22V, allows it to accept a variety of power sources, including the commonly used 5V, 12V and 19V AC adapters. The first buck regulator provides a logic voltage with up to 2A of current. The other three switching regulators provide the three bias voltages, AVDD, VON and VOFF, required by LCDs. All four regulators are synchronized to a 1.2MHz internal clock, allowing the use of small, low cost inductors and ceramic capacitors. Since different types of panels may require different bias voltages, all output voltages are adjustable for maximum flexibility. Programmable soft-start capability is included in all outputs to limit inrush current. The LT1943 has a built-in start-up sequence and panel protection feature. The LT1943 is available in a low-profile 28-pin TSSOP package.

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