LINEAR Manuals

The LT1016 is a 10ns ultrafast comparator from Linear Technology. It can interface directly with TTL/CMOS logic and can operate in either ±5V or single 5V supply. The LT1016 offers high precision, high gain, matched complementary outputs, and a unique output stage that provides active drive in both directions for maximum speed into TTL/CMOS logic or passive loads.

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The LT1366/LT1367/LT1368/LT1369 are dual and quad bipolar op amps which combine rail-to-rail input and output operation with precision specifications. These op amps maintain their characteristics over a supply range of 1.8V to 36V. Input offset voltage is typically 150µV, with an open-loop gain AVOL of 1 million while driving a 10k load. Common mode rejection is typically 90dB over the full rail-to-rail input range, and supply rejection is 110dB. The LT1366/LT1367 have conventional compensation which assures stability for capacitive loads of 1000pF or less. The LT1368/LT1369 have compensation that requires a 0.1µF output capacitor, which improves the amplifier’s supply rejection and reduces output impedance at high frequencies. The output capacitor’s filtering action reduces high frequency noise, which is beneficial when driving A/D converters.

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The LT1619 is a low voltage current mode PWM controller designed for implementing current mode DC/DC converters with minimum external parts. It operates with input voltages ranging from 1.9V to 18V and is suitable for a variety of battery-powered and distributed DC/DC converters. The controller features an internal rail-to-rail N-channel MOSFET driver that can operate either from the input in the nonbootstrapped mode or from the output in bootstrapped operation. It is designed to drive a low side power transistor in boost, SEPIC, flyback, and other topologies. The converter efficiency is improved at heavy loads with a 53mV current sense voltage and at light load with Burst Mode operation. The operating frequency is internally set at 300kHz and can be externally synchronized up to 500kHz. The LT1619 is available in 8-lead MSOP and SO packages with a no load quiescent current of 140µA and a shutdown current of 15µA.

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The LTC®1174 is a simple current mode DC/DC converter ideally suited for 9V to 5V, 5V to 3.3V or 5V to –5V operation. With an internal 0.9Ω switch (at a supply voltage of 9V), the LTC1174 requires only four external components to construct a complete high efficiency DC/DC converter. Under a no load condition the LTC1174 draws only 130µA. In shutdown, it draws a mere 1µA making this converter ideal for current sensitive applications. In dropout, the internal P-channel MOSFET switch is turned on continu- ously allowing the user to maximize the life of the battery source. The maximum inductor current of the LTC1174 family is pin selectable to either 340mA or 600mA, optimizing efficiency for a wide range of applications. Operation up to 200kHz permits the use of small surface mount inductors and capacitor.

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The LT1398/LT1399/LT1399HV are low-cost dual and triple 300MHz current feedback amplifiers with shutdown. The LT1399HV is a higher voltage version of the LT1399. The LT1398 is a two amplifier version of the LT1399. The LT1398/LT1399 operate on all supplies from a single 4V to ±6V. The LT1399HV operates on all supplies from 4V to ±7.5V. Each amplifier draws 4.6mA when active. When disabled each amplifier draws zero supply current and its output becomes high impedance. The amplifiers turn on in only 30ns and turn off in 40ns, making them ideal in spread spectrum and portable equipment applications. The LT1398/LT1399/LT1399HV are manufactured on Linear Technology’s proprietary complementary bipolar process. The LT1399/LT1399HV are pin-for-pin upgrades to the LT1260 optimized for use on ±5V/±7.5V supplies.

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The LTC1293/4/6 is a family of data acquisition systems which contain a serial I/O successive approximation A/D converter. It uses LTCMOS switched capacitor technology to perform either 12-bit unipolar, or 11-bit plus sign bipolar A/D conversions. The input multiplexer can be configured for either single ended or differential inputs (or combinations thereof). An on-chip sample and hold is included for all single ended input channels. When the LTC1293/4/6 is idle it can be powered down in applications where low power consumption is desired. The LTC1296 includes a System Shutdown Output pin which can be used to power down external circuitry, such as signal conditioning circuitry prior to the input mux. The serial I/O is designed to communicate without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing up to eight channels of data to be transmitted over as few as three wires.

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The LTC1282 is a 12-bit A/D converter with a sampling rate of 140ksps and is powered by a single supply with a power consumption of 12mW. It has a built-in 1.14µs sample and hold, a high-precision reference voltage and an internal calibrated clock. It supports single-ended and bipolar conversion modes. The device is built with LTBiCMOS TM switched capacitor technology. It has a 25ppm/°C (max) internal reference voltage, which converts 0V to 2.5V single-ended inputs from a single 3V supply. With ±3V supplies, the input range is ±1.25V with two's complement output format. The maximum DC specifications include ±0.5LSB INL, ±0.75LSB DNL, and 25ppm/°C full-scale drift over temperature. Outstanding AC performance includes 69dB S/(N + D) and 77dB THD at the Nyquist input frequency of 70kHz. The internal clock is trimmed for a maximum conversion time of 6µs. The clock automatically synchronizes to each sample command, eliminating problems with asynchronous clock noise found in competitive devices. A high-speed parallel interface simplifies connections to FIFOs, DSPs, and microprocessors.

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The LT1920 is a single resistor gain programmable, precision instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. It offers low power dissipation, low voltage noise, high accuracy, and various other features making it a cost-effective solution for precision instrumentation amplifier applications.

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The LTC4350 is a load share controller that allows systems to equally load multiple power supplies connected in parallel. The output voltage of each supply is adjusted using the SENSE+ input until all currents match the share bus. The LTC4350 also isolates supply failures by turning off the series pass transistors and identifying the failed supply. The failed supply can then be removed and replaced with a new unit without turning off the system power. The LTC4350 is available in a 16-pin narrow SSOP package.

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The LT1764A series is a 3A low dropout regulator with features such as fast transient response and low noise.

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The LTC1734 is a low-cost, single-cell, constant-current/constant-voltage Li-Ion battery charger controller. It is a small and low-cost charger for single-cell lithium-ion batteries. It comes in 4.1V and 4.2V versions with 1% accuracy. Constant current can be set using an external resistor, and charge current can be monitored via voltage. It has automatic sleep mode and manual shutdown features.

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The LT3591 is a high side LED current sense Li-Ion driver that can drive up to 10 white LEDs in series. The device only requires one external capacitor, has a high switching frequency and accurate LED dimming.

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LTC1274/LTC1277 12-Bit, 10mW, 100ksps ADCs with 1µA Shutdown are low-power, high-performance 12-bit ADCs that operate from a single 5V or ±5V supply and draw only 2mA (typ). They feature a 2µs sample-and-hold, a precision reference, and an internally trimmed clock. The products offer unipolar and bipolar conversion modes, and two power-down modes: Nap mode and Sleep mode.

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The LT3593 is a step-up DC/DC converter designed to drive up to ten white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents and eliminates the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a “one wire current source” where the low side of the LED string can be returned to ground anywhere. Additional features include output disconnect in shutdown, open LED protection and 1-pin shutdown/LED current control. The CTRL pin is toggled to adjust the LED current via an internal counter and a 5-bit DAC. The LT3593 switches at 1MHz, allowing the use of tiny external components. Constant frequency switching results in low input noise and a small output capacitor. The LT3593 is available in the 6-lead DFN (2mm × 2mm) as well as the 6-lead SOT-23 packages.

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LTC1852/LTC1853 are 10-bit/12-bit, 400ksps, low power, sampling ADCs.

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This document introduces the LTC2631 series of 12-bit, 10-bit and 8-bit voltage output DACs, including their features, characteristics, and application scenarios.

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The LT ®1615/LT1615-1 are micropower step-up DC/DC converters in a 5-lead low profile (1mm) ThinSOT pack- age.

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The LT ®1612 is an 800kHz, synchronous step-down DC/ DC converter that operates from an input voltage as low as 2V. Internal 0.45Ω switches deliver output currents up to 500mA, and the 800kHz switching frequency allows the use of small, low value ceramic input and output capacitors. Input voltage ranges from 5.5V down to 2V and output voltage can be set as low as the 620mV reference. The device features Burst Mode TM operation, keeping efficiency high at light loads. Burst Mode operation can be defeated by pulling the MODE pin high, enabling constant switching throughout the load range for low noise. No-load quiescent current is 160µA and shutdown current is less than 1µA. The device is available in 8-lead SO and MSOP packages.

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