LINEAR Manuals

The LT1533 is a new class of switching regulator designed to reduce conducted and radiated electromagnetic interference (EMI). It features ultralow noise and EMI, high efficiency, and independent control of switch voltage and current slew rates.

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The LTC1702 is a dual switching regulator controller opti- mized for high efficiency with low input voltages.

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The LTC3401 is a high-efficiency, fixed-frequency, step-up DC/DC converter that operates from an input voltage below 1V. The device includes a 0.16Ω N-channel MOSFET switch and a 0.18Ω P-channel synchronous rectifier. Switching frequencies up to 3MHz are programmed with an external timing resistor and the oscillator can be synchronized to an external clock. An external Schottky diode is optional but will slightly improve efficiency. Quiescent current is only 38µA in Burst Mode operation, maximizing battery life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the MODE/SYNC pin high. If the MODE/SYNC pin has either a clock or is driven low, then fixed frequency switching is enabled. Other features include 1µA shutdown, antiringing control, open-drain power good output, thermal shutdown and current limit. The LTC3401 is available in the 10-lead thermally enhanced MSOP package. Higher current applications should use the 2A rated LTC3402 synchronous boost converter. Applications that require VOUT < 2.6V should use the LTC3423. All-Ceramic-Capacitor 2-Cell to 3.3V at 500mA Step-Up Converter.

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The LT1767 is a 1.25MHz monolithic buck switching regulator with features such as high efficiency, wide operating voltage range, and low power consumption. It uses current mode control to provide fast transient response and excellent loop stability.

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The LTC1703 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. It uses a constant- frequency, true PWM design switching at 550kHz, minimiz- ing external component size and cost and optimizing load transient performance.

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The LT ®3431 is a 500kHz monolithic buck switching regu- lator that accepts input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the nec- essary oscillator, control and logic circuitry.

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The LT1610 is a micropower fixed frequency DC/DC converter that operates from an input voltage as low as 1V. Intended for small, low power applications, it switches at 1.7MHz, allowing the use of tiny capacitors and inductors. The device can generate 3V at 30mA from a single cell (1V) supply. An internal compensation network can be connected to the LT1610’s VC pin, eliminating two external components. No-load quiescent current of the LT1610 is 30µA, and the internal NPN power switch handles a 300mA current with a voltage drop of 300mV. The LT1610 is available in 8-lead MSOP and SO packages.

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The LTC4257 is a complete power interface power supply chip designed for IEEE 802.3af PoE systems. It integrates 25k signature resistors, classification current sources, input current limiting with thermal foldback, undervoltage lockout, and power good signaling, all in a single 8-pin package. The chip integrates a high-voltage power MOSFET, which reduces the cost for system designers and saves board space. LTC4257 can directly interface with Linear Technology's various DC/DC converter products to provide an economical power solution for IP phones, wireless access points and other PDs. Linear Technology also provides solutions for PSE applications based on quad network power controllers. LTC4257 is available in 8-pin SO and low profile (3mm x 3mm) DFN packages.

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LTC3738 3738f is a 3-phase step-down switch- ing regulator controller from Linear Technology Corporation. It is mainly used in high-performance notebook computers, servers, desktop computers and workstations. The controller supports 3-phase synchronous step-down switching power supply, and can drive all N-channel external power MOSFET stages. The working frequency is 210kHz to 530kHz.

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The LTC ®3707 is a high performance dual step-down switching regulator controller that drives N-channel syn- chronous power MOSFET stages.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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