LINEAR Manuals

LTC1696 is a standalone power supply overvoltage monitor and protection device designed to protect a power supply load in the event of an overvoltage fault. It monitors two adjustable output voltages. If an overvoltage condition is detected, the output drives either an external SCR crowbar or turns off external back-to-back N-channel MOSFETs, thereby, disconnecting the input voltage from the power supply.

The LT3466 is a dual full function white LED step-up converter specifically designed to drive up to 20 White LEDs (10 in series per converter) with a constant current. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors and expensive factory calibration. The two independent converters are capable of driving asymmetric LED strings. The dimming of the two LED strings can also be controlled independently. The LT3466 is ideal for providing backlight for main and sub-displays in cell phones and other handheld devices. The LT3466 operates in switch-mode mode and provides peak efficiencies of up to 81% over an input voltage range of 2.7V to 24V and can operate at switching frequencies up to 2MHz.

This document introduces the features and characteristics of the LT6552 differential amplifier, including differential to single-ended conversion, video line driver, automotive displays, RGB amplifiers, coaxial cable drivers and low voltage high speed signal processing.

The LT ®1632/LT1633 are dual/quad, rail-to-rail input and output op amps with a 45MHz gain-bandwidth product and a 45V/µs slew rate. The LT1632/LT1633 have excellent DC precision over the full range of operation. Input offset voltage is typically less than 400µV and the minimum open-loop gain of 0.8 million into a 10k load virtually eliminates all gain error. Common mode rejection is typically 83dB over the full rail- to-rail input range when on a single 5V supply for excellent noninverting performance. The LT1632/LT1633 maintain their performance for sup- plies from 2.7V to 36V and are specified at 3V, 5V and ±15V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output. The output delivers load currents in excess of 35mA.

The LTC2480 is a 16-bit No Latency ∆Σ ADC with patented Easy Drive technology that enables rail-to-rail inputs with zero differential input current, allowing high impedance sensors to be digitized with full accuracy.

The LTC ®3453 is a synchronous buck-boost DC/DC converter optimized for driving up to 4 white LEDs at a combined current of up to 500mA from a single Li-Ion battery input.

The LT ®1529/LT1529-3.3/LT1529-5 are 3A low dropout regulators with micropower quiescent current and shut- down. The devices are capable of supplying 3A of output current with a dropout voltage of 0.6V. Designed for use in battery-powered systems, the low quiescent current, 50µA operating and 16µA in shutdown, make them an ideal choice. The quiescent current is well controlled; it does not rise in dropout as it does with many other low dropout PNP regulators. Other features of the LT1529 /LT1529-3.3/LT1529-5 in- clude the ability to operate with small output capacitors. They are stable with 22µF on the output while most older devices require up to 100µF for stability. Small ceramic capacitors can be used, enhancing manufacturabiltiy. Also the input may be connected to voltages lower than the output voltage, including negative voltages, without re- verse current flow from output to input. This makes the LT1529/LT1529-3.3/LT1529-5 ideal for backup power situations where the output is held high and the input is at ground or reversed. Under these conditions, only 16µA will flow from the OUTPUT pin to ground. The devices are available in 5-lead TO-220 and 5-lead DD packages.

The LTC3252 is a DC/DC converter from Linear Technology that uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. The part has no inductors and uses a unique constant frequency, spread spectrum architecture to provide a very low noise regulated output as well as low noise at the input. The part also has Burst Mode ® operation to provide high efficiency at low output currents, as well as ultralow current shutdown. Low operating currents (60µA with both outputs enabled, 35µA with one output enabled) and low external parts count make the LTC3252 ideally suited for space-con- strained battery-powered applications. The part is short- circuit and overtemperature protected and is available in a tiny 4mm × 3mm 12-pin DFN package.

The LT ®6220/LT6221/LT6222 are single/dual/quad, low power, high speed rail-to-rail input and output operational amplifiers with excellent DC performance.

The LT3486 is a dual step-up DC/DC converter specifically designed to drive up to 16 White LEDs (8 in series per converter) at constant current from a single Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness. The two independent converters are capable of driving asymmetric LED strings. The dimming of the two LED strings can be controlled independently via the respective CTRL pins. An internal dimming system allows the dimming range to be extended up to 1000:1 by feeding a PWM signal to the respective PWM pins. The LT3486 operating frequency can be set with an external resistor over a 200kHz to 2.5MHz range. A low 200mV feedback voltage (±3% accuracy) minimizes power loss in the current setting resistor for better efficiency. Additional features include output voltage limiting.

The LTC4263 is an autonomous single-channel PSE controller for use in IEEE 802.3af compliant Power over Ethernet systems. It includes an onboard power MOSFET, internal inrush, current limit, and short-circuit control, IEEE 802.3af compliant PD detection and classification circuitry, and selectable AC or DC disconnect sensing.

The LS840/LS841/LS842 is a low noise, low drift, low capacitance monolithic dual N-channel JFET from Linear Integrated Systems

The LT1715 is a low voltage comparator from Linear Technology Corporation. It features a 4ns propagation delay and a 150MHz toggle frequency. It can independently provide power to the input and output, and has good common mode rejection ratio and linearity.