LINEAR Manuals

The LTC3727/LTC3727-1 are high efficiency dual 12V/5V step-down converters with features including wide output voltage range, out-of-phase controllers, OPTI-LOOP compensation, output voltage accuracy, and power good output voltage monitor.

The LTC1415 is a 1.25MSPS, 12-bit sampling ADC that draws only 55mW from a single 5V supply and can operate with external or internal reference.

The LT3430 is a high voltage, 3A, 200kHz step-down switching regulator with a wide input range, high efficiency, fast transient response, and excellent loop stability.

The LT3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and excellent loop stability. Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1. The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package.

The LTC4098 is a high efficiency USB PowerPathTM controller and full-featured Li-Ion/Polymer battery charger. It seamlessly manages power distribution from multiple sources including USB, wall adapter, automotive, firewire or other high voltage DC/DC converters, and a Li-Ion/Polymer battery. The LTC4098’s internal switching regulator automatically limits its input current for USB compatibility. For automotive and other high voltage applications, the LTC4098 interfaces with a Linear Technology external switching regulator to provide a high efficiency high voltage power path. Both the USB and the optional high voltage inputs feature Bat-Track optimized charging to provide maximum power to the application and ease thermal issues in high power density applications with input supplies from 5V to as high as 38V. An overvoltage circuit protects the LTC4098 from high voltage damage on the USB/Wall adaptor inputs with an N-channel FET and a resistor. The LTC4098 is available in the ultra-thin (0.55mm) 20-Lead 3mm × 4mm QFN surface mount package.

The LT1969 is an adjustable current version of the popular LT1886, a 200mA minimum output current, dual op amp with outstanding distortion performance. The adjustable current feature is highly desirable in applications where minimum power dissipation is required while still being able to provide adequate line termination. At nominal supply current, the amplifiers are gain of 10 stable and can easily be compensated for lower gains. The LT1969 features balanced high impedance inputs with 4µA input bias current and 4mV maximum input offset voltage. Single supply applications are easy to implement and have lower total noise than current feedback amplifier implementations. The output drives a 25Ω load to ±4.3V with ±6V supplies. On ±2.5V supplies, the output swings ±1.5V with a 100Ω load. The amplifier is stable with a 1000pF capacitive load making it useful in buffer and cable driver applications. The LT1969 is manufactured on Line.

The LT1221 is a very high-speed operational amplifier with superior DC performance. It features reduced input offset voltage, lower input bias currents, and higher DC gain than devices with comparable bandwidth and slew rate. The circuit is a single gain stage that includes proprietary DC gain enhancement circuitry to obtain precision with high speed. The high gain and fast settling time make the circuit an ideal choice for data acquisition systems. The circuit is also capable of driving capacitive loads, making it useful in buffer or cable driver applications.

The LTC1290 is a single-chip 12-bit data acquisition system from Linear Technology that uses LTCMOS 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). All single-ended input channels include an on-chip sample-and-hold. When the LTC1290 is idle, it can be powered down with a serial word in applications where low power consumption is desired. The serial I/O is designed to be compatible with microprocessors.

The LTC®3808 is a synchronous step-down switching regulator controller that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for a current sense resistor and improves efficiency. By employing Spread Spectrum modulation technology, the device achieves low noise over a wide input voltage range.

The LT®1777 is a Buck (step-down) regulator designed for noise sensitive applications. It contains a dI/dt limiting circuit programmed via a small external inductor in the switching path. Internal circuitry also generates controlled dV/dt ramp rates. The monolithic die includes all oscillator, control and protection circuitry. The part can accept operating input voltages as high as 48V, and contains an output switch rated at 700mA peak current. Current mode control offers excellent dynamic input supply rejection and short-circuit protection. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply (see Applications Informa- tion). The fused-lead SO16 package and 100kHz switch- ing frequency allow for minimal PC board area requirements.

The LTC1704/LTC1704B is a high power synchronous switching regulator controller with high efficiency and low power consumption, suitable for a variety of applications.

The LTC1257 is a complete single supply, 12-bit voltage output digital-to-analog converter (DAC) in an SO-8 package. It includes an output buffer amplifier, 2.048V voltage reference, and an easy to use three-wire cascadable serial interface. It is suitable for industrial process control and automatic test equipment. The LTC1257 features small size, low power consumption, and other characteristics.

The document mainly introduces the LTC3832/LTC3832-1 series products. The series products are high power and high efficiency switching regulator controllers, which can be used for 3.3V-5V to 0.6V-3.xV step-down applications. The series products have ±1% output voltage regulation accuracy and can maintain stability under temperature, load current and input voltage changes. The efficiency is up to 95%. It can provide adjustable or fixed 2.5V output.

The LTC1255 is a dual 24V high-side MOSFET driver that allows using low cost N-channel FETs for high-side industrial and automotive switching applications. An internal charge pump boosts the gate drive voltage above the positive rail, fully enhancing an N-channel MOS switch with no external components. Low power operation, with 12µA standby current, allows use in virtually all systems with maximum efficiency. Included on-chip is independent overcurrent sensing to provide automatic shutdown in case of short circuits. A time delay can be added to the current sense to prevent false triggering on high in-rush current loads. The LTC1255 operates from 9V to 24V supplies and is well suited for industrial and automotive applications. The LTC1255 is available in both an 8-pin DIP and an 8-pin SOIC.