LINEAR Manuals

The LT1424-5 is a monolithic high power switching regulator specifically designed for the isolated flyback topology. No “third winding” or optoisolator is required; the integrated circuit senses the isolated output voltage directly from the primary side flyback waveform. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. The LT1424-5 operates with input supply voltages from 3V to 20V and draws only 7mA quiescent current. It can deliver up to 400mA at 5V with no external power devices. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. The LT1424-5 has a number of features not found on other switching regulator ICs. Its unique control circuitry can maintain regulation well into discontinuous mode. Load compensation circuitry allows for improved load regulation. An externally activated shutdown mode reduces total supply current to 20µA typical for standby operation.

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LT1777 is a low noise step-down switching regulator designed by Linear Technology. It features programmable di/dt limit, internally limited dv/dt, high input voltage(48V), 700mA peak switch rating, true current mode control, 100kHz fixed operating frequency, synchronizable to 250kHz, low supply current in shutdown(30µA), low thermal resistance 16-pin SO package.

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LTC1147-3.3 and LTC1147-5/LTC1147L are high-efficiency step-down switching regulator controllers with features such as wide input voltage range, high efficiency, low standby current, and short-circuit protection.

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This document is about LT1766/LT1766-5, LT1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. It includes a high efficiency 1.5A, 0.2Ω switch, as well as all the necessary oscillator, control and logic circuitry. A current mode control architecture delivers fast transient response and excellent loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. By using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch, efficiency is maintained over a wide output current range. Patented circuitry* maintains peak switch current rating.

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LTC1091/LTC1092/LTC1093/LTC1094 is a 10-bit serial I/O data acquisition system with programmable unipolar/bipolar conversions, differential/single-ended multiplexer configurations, sample-and-holds, single supply 5V, 10V or ±5V operation, direct 3- or 4-wire interface to most MPU serial ports and all MPU parallel I/O ports, analog inputs common mode to supply rails, resolution: 10 bits, total unadjusted error (A Grade): ±1LSB over temp, fast conversion time: 20µs, low supply current LTC1091: 3.5mA Max, 1.5mA Typ LTC1092/LTC1093/LTC1094: 2.5mA Max, 1mA Typ.

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The LTC ®1871 is a wide input range, current mode, boost, flyback or SEPIC controller that drives an N-channel power MOSFET and requires very few external compo- nents.

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The LTC1099 is a high speed microprocessor compatible 8-bit analog-to-digital converter (A/D) from Linear Technology Corporation. It has a conversion rate of 2.5µs and can sample input signals up to 156kHz 5VP-P.

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LT3080 1 3080f Adjustable 1.1A Single Resistor Low Dropout Regulator

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The LTC1290 is a data acquisition component from Linear Technology Corporation that uses LTCMOS TM switched capacitor technology to perform either 12-bit unipolar or 11-bit plus sign bipolar A/D conversions. The 8-channel input multiplexer can be configured for either single-ended or differential inputs (or combinations thereof).

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The REF-01/REF-02 are precision 10V and 5V bandgap references which provide stable output voltages over a wide range of operating conditions. Output voltage is accurate to ±0.3% with a low 5ppm/°C typical temperature coefficient.

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The LT1203/LT1205 150MHz Video Multiplexers are wideband 2-input video multiplexers designed for pixel switching and broadcast quality routing. The LT1205 is a dual version that is configured as a 4-input, 2-output multiplexer. These multiplexers act as SPDT video switches with 10ns transition times at toggle rates up to 30MHz. The –3dB bandwidth is 150MHz and 0.1dB gain flatness is 30MHz. Many parts can be tied together at their outputs by using the enable feature which reduces the power dissipation and raises the output impedance to 10MΩ. Output capacitance when disabled is only 3pF and the LT1203 peaks less than 3dB into a 50pF load. Channel crosstalk and disable isolation are greater than 90dB up to 10MHz. An on-chip buffer interfaces to fast TTL or CMOS logic. Switching transients are only 50mV with a 25ns duration. The LT1203 and LT1205 outputs are protected against shorts to ground. The LT1203/LT1205 are manufactured using Linear Technology’s proprietary complementary bipolar process. The LT1203 is available in both the 8-lead PDIP and SO package while the LT1205 is available in a 16-lead SO package.

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This document mainly introduces the LT1580/LT1580-2.5 low dropout regulator, which has a low dropout voltage of 540mV and a fast transient response.

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The LTC660 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range of 1.5V to 5.5V, resulting in complementary output voltages of –1.5V to –5.5V. It also performs a doubling at an input voltage range of 2.5V to 5.5V, resulting in a doubled output voltage of 5V to 11V. Only two external capacitors are needed for the charge pump and charge reservoir functions. The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs at a 10kHz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the BOOST pin is tied to V+. The LTC660 contains an internal oscillator, divide-by-two, voltage level shifter and four power MOSFETs. It is suitable for converting 5V to ±5V supplies, inexpensive negative supplies, data acquisition systems, and as a high current upgrade to LTC1044 or LTC7660.

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The LT3825 is an isolated switching regulator controller designed for medium power flyback topologies. It features sensing output voltage directly from the primary side winding without an optoisolator, improving dynamic response and reliability. It also has synchronous rectification to increase converter efficiency and improve output cross regulation in multiple output converters. The LT3825 operates in forced continuous conduction mode, improving cross regulation.

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The LT3012B 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 (40µA operating) makes the LT3012B an ideal choice. Quiescent current is also well controlled in dropout. Other features of the LT3012B include the ability to operate with very small output capacitors. The regulators are 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.

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The LTC 3440 is a high efficiency, fixed frequency, Buck- Boost DC/DC converter that operates from input voltages above, below or equal to the output voltage

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The LTC2433-1 is a 16-bit analog-to-digital converter with micropower, no latency ∆ΣTM technology, single conversion digital filter, etc.

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LT6011/LT6012 is a low noise, high precision input performance, low power consumption, rail to rail output swing precision operational amplifier. Input offset voltage can be trimmed to less than 60μV. Low drift and excellent long-term stability guarantee high accuracy over temperature and time. The maximum input bias current of 300pA and the minimum voltage gain of 120dB further maintain this precision over operating conditions. LT6011/LT6012 can operate at any power supply voltage from 2.7V to 36V and draw only 135μA of supply current on a 5V supply. The output swings to within 40mV of either supply rail, making the amplifier a good choice for low voltage single supply applications. LT6011/LT6012 are specified at 5V and ±15V supplies and from -40°C to 85°C. LT6011 (dual) is available in SO-8, MS8 and space saving 3mm x 3mm DFN package.

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