LINEAR Manuals

The LTC3633 is a high efficiency, dual output monolithic synchronous step-down switching regulator, capable of delivering 3A of output current per channel from input voltages between 3.6V and 15V. Its compact 4mm × 5mm QFN package has very low thermal impedance eliminating the need for an external heat sink. Its high input voltage capability makes the LTC3633 ideal for 12V distributed power systems.

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This document introduces a supercapacitor-based UPS system that provides backup power during power failures to allow the RAID controller to write volatile data to nonvolatile storage.

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The LTM4611 is a switch mode, step-down DC/DC µModule® regulator in a compact 15mm × 15mm × 4.32mm LGA surface mount package. The switching controller, MOSFETs, inductor and supporting components are housed in the package. With a built-in differential remote sense amplifier, the LTM4611 can tightly regulate its output voltage from 0.8V to within 300mV of VIN and deliver 15A output efficiently from 1.5V to 5.5V input.

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This document describes a high power factor, isolated LED driver that does not require opto-isolators and is compatible with TRIAC dimmers. The LT3799 integrates all the required functions for offline LED lighting.

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This design note explains how to create a compact battery charger using a small 2-cell solar panel to provide renewable energy charging for battery-powered sensors and other devices located far from the power grid.

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This article describes how to generate negative output voltages from positive inputs using Linear Technology's DC/DC step-down μModule® regulators. A conventional buck μModule regulator can be easily configured as an inverting buck-boost converter to generate negative output voltages. The article uses LTM®8025 as an example to demonstrate how to achieve negative output voltages with level-shifting circuitry for synchronization. This approach can also be applied to other μModule regulators such as LTM8022, LTM8023, and LTM8027.

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The LT3692A is a dual-channel monolithic buck regulator that operates from inputs up to 36V and supports high output currents. It has high input voltage and high transient capability, making it suitable for harsh operating environments such as automotive environments. The regulator also provides an on-die temperature monitoring function, which facilitates application circuit design, debugging, and package thermal optimization.

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This design note describes how to use the external power input pin (EXTVCC) to provide bias power to a high input voltage step-down controller, increasing the efficiency of the converter. This method can be used with controllers such as the LTC3890 (dual output) and LTC3891 (single output).

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The LTC2379-18 is an 18-bit, 1.6Msps SAR ADC with an extremely high SNR and THD. It also features a unique digital-gain compression function, which eliminates the need for a negative supply in the ADC driver circuit.

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This article describes an electronic circuit breaker, combining current sensing with timing to create an energy- tripped breaker, which protects sensitive circuits while minimizing nuisance trips.

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This document describes the design of the LTC3805-5 negative buck converter, which can output –3.3V at 3A from a –10V to –14V input voltage.

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This design note introduces the LTC®4365, a unique solution that elegantly and robustly protects sensitive circuits from unpredictably high or negative supply voltages. The LTC4365 blocks positive voltages as high as 60V and negative voltages as low as –40V. Only voltages within the 5V to 36V window can pass through the device. The LTC4365 uses a high voltage window comparator and charge pump to achieve low power, reliable overvoltage and undervoltage protection.

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This document introduces the LTC®4155 and LTC4156 dual multiplexed-input battery chargers, featuring PowerPath™ control, I2C programmability and USB On-The-Go for systems such as tablet PCs and other high power density applications. The LTC4155’s float voltage (VFLOAT) range is optimized for Li-Ion batteries, while the LTC4156 is optimized for lithium iron phosphate (LiFePO4) batteries, supporting system loads to 4A with up to 3.5A of battery charge current. I2C controls a broad range of functions and USB On-The-Go functionality is controlled directly from the USB connector ID pin.

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This design note introduces a power backup system based on supercapacitors that can protect volatile data in handheld devices in the event of a power loss. Supercapacitors are a compact, robust, and reliable power source that can meet the power requirements of a backup system for short-term power loss events.

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The LT3759 is a wide input voltage range boost/inverting/SEPIC controller that operates from 1.6V to 42V. It offers both positive and negative output control and can be used in various power supply designs.

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LTC3789 is a high effi ciency 4-switch buck-boost controller that provides accurate output current limit

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The LT3791 is a 4-switch synchronous buck-boost DC/DC converter that regulates both constant-current and constant-voltage at up to 98.5% efficiency with a single inductor. It can deliver hundreds of watts and features a 60V input and output rating, making it ideal for driving high power LED strings and charging high voltage batteries when both step-up and step-down conversion is needed. It can also be used as a constant-voltage buck-boost regulator with current limiting and monitoring for both input and output.

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This document introduces the LTC3890 and LTC3891 step-down DC/DC controllers. These controllers can accept inputs from 4V to 60V and support single and dual battery automotive environments. They can also output 12V 25A. If no galvanic isolation is required between the input and output voltages, the LTC3890 and LTC3891 can replace expensive and bulky transformer-based converters. Compared to transformer-based solutions, the LTC3890 and LTC3891 step-down converters increase efficiency, reduce power loss in the supply lines, simplify layout and significantly reduce the bill of materials.

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This design note introduces matched resistor networks for precision amplifier applications and describes how to achieve high-precision matched resistor networks using the LT5400 amplifier.

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The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency and low duty cycle capability. It accepts a wide input range, 4.5V to 38V, and can produce 0.6V to 5.5V outputs.

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