LINEAR Manuals (Others)

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.

File format: PDF Size:246 KB

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.

File format: PDF Size:299 KB

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.

File format: PDF Size:276 KB

This document introduces the LT1616 600mA, 1.4MHz step-down switching regulator, which uses an internal 0.6A power switch and is packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 25V makes the LT1616 suitable for regulating a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors. With its internal compensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches of PC board area. The constant frequency current mode PWM architecture and stable operation with ceramic capacitors results in low, predictable output ripple. Current limiting provides protection against shorted outputs. The low current (<1µA) shutdown provides complete output disconnect, enabling easy power management in battery-powered systems.

File format: PDF Size:277 KB

The LTC ®3780 is a high performance buck-boost switch- ing regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phase- lockable frequency of up to 400kHz.

File format: PDF Size:468 KB

The LT1166 is a bias generating system for controlling class AB output current in high powered amplifiers.

File format: PDF Size:393 KB

The LTC3035 is a micropower, VLDO™ (very low drop-out) linear regulator which operates from input voltages as low as 1.7V. The device is capable of supplying 300mA of output current with a typical dropout voltage of only 45mV. To allow operation at low input voltages the LTC3035 includes a charge pump generator that provides the necessary bias voltage for the internal LDO circuitry. Output current comes directly from the input supply for high efficiency regulation. The charge pump bias generator requires only a 0.1µF flying capacitor and a 1µF bypass capacitor for operation. The low 0.4V internal reference voltage allows the LTC3035 to be programmed to much lower output voltages than commonly available in LDOs. The output voltage is programmed via two tiny SMD resistors. The LTC3035’s low quiescent current makes it an ideal choice for use in battery-powered systems. Other features include high output voltage.

File format: PDF Size:215 KB

The LT3742 is a dual step-down DC/DC switching regulator controller from Texas Instruments. The device operates at a frequency of 500kHz and has an input voltage range of 4V to 30V. The output voltage range is 0.8V to VIN. The device uses a 2-phase antiphase output architecture to reduce output voltage ripple and minimize interference with the input supply, reducing the need for input capacitance. The device also integrates a 0.8V voltage reference and a 500kHz current mode control loop, which can provide bias power for N-channel MOSFETs and support low dropout and 100% duty cycle operation. The device also has a built-in soft-start function. The device is available in a 4mm×4mm QFN package and has a very low power consumption of only 20μA in standby mode.

File format: PDF Size:287 KB

LT3500 is a monolithic 2A step-down regulator plus linear regulator/controller. It has a wide input range: 3V to 40V, which makes it suitable for a variety of power sources, including automotive batteries, 24V industrial supplies and unregulated wall adapters. The device also has resistor-programmable 250kHz to 2.2MHz frequency range and synchronization capability, which enable optimization between effi ciency and external component size. Cycle- by-cycle current limit, frequency foldback and thermal shutdown provide protection against a shorted output. Soft-start feature can control the ramp rate of the output voltage, eliminating input current surge during start-up, and also provides output tracking. LT3500 also contains an internal NPN transistor, which has feedback control and can be configured as a linear regulator or a linear regulator controller. LT3500's low current shutdown mode (<12μA) enables easy power management in battery-powered systems.

File format: PDF Size:288 KB

This document describes the features and characteristics of the LTC3809 3809fb product, including no current sense resistor required, selectable spread spectrum frequency modulation, constant frequency current mode operation, etc.

File format: PDF Size:262 KB

LTC1286/LTC1298 Micropower Sampling 12-Bit A/D Converters

File format: PDF Size:287 KB

The LTC6702 is an extremely small dual comparator designed by LTC to maximize battery life while providing both speed and low voltage operation in applications where board space is a premium. These comparators operate on supplies between 1.7V and 5.5V, and have a maximum guaranteed propagation delay of 500ns while drawing only 30μA maximum quiescent current. Internal hysteresis desensitizes the LTC6702 to input noise and makes it easy to use, even with slow mov- ing signals. CMOS inputs allow the use of large source impedances. The LTC6702 is available in the 8-pin SOT-23 and the tiny 2mm × 2mm DFN package.

File format: PDF Size:186 KB

LTC1686/LTC1687 are 52Mbps precision delay RS485 fail-safe transceivers with features including high data rate, low delay skew, high input resistance, and short-circuit protection.

File format: PDF Size:180 KB

LTC4257 is a PoE PD power interface chip for IEEE 802.3af PoE system. It integrates 25k signature resistor, classification current source, input current limit with thermal foldback, undervoltage lockout and power good signalling, all in a single 8-pin package. It can be interfaced with a variety of LT DC/DC converter products to provide a cost effective power solution for IP phones, wireless access points and other PDs.

File format: PDF Size:259 KB

The LT1640L/LT1640H is an 8-pin, negative voltage Hot Swap controller that allows safe board insertion and removal from a live -48V backplane. It features programmable inrush current, electronic circuit breaker, overvoltage protection, and undervoltage lockout.

File format: PDF Size:188 KB

The LT1506 is a 500kHz step-down switching regulator with a constant switching frequency of 500kHz. It is easily synchronizable and operates with an input as low as 4V. The regulator uses all surface mount components and features a reduced inductor size of 1.8µH. The saturating switch design has a resistance of 0.07Ω and the shutdown current is 20µA. It also includes cycle-by-cycle current limiting. The LT1506 is optimized for lower input voltage applications and has a wide input range of 4V to 15V. It is a current mode topology with high efficiency at high switching frequency. The regulator fits into standard 7-pin DD and fused lead SO-8 packages and provides full cycle-by-cycle short-circuit protection and thermal shutdown. It can be used for both fixed output voltage and adjustable applications.

File format: PDF Size:296 KB

The LT1339 is a high power synchronous current mode switching regulator controller. The IC drives dual N-channel MOSFETs to create a single IC solution for high power DC/DC converters in applications up to 60V. The LT1339 incorporates programmable average current limiting, allowing accurate limiting of DC load current independent of inductor ripple current. The IC also incorporates user-adjustable slope compensation for minimization of magnetics at duty cycles up to 90%. The LT1339 timing oscillator operating frequency is programmable and can be synchronized up to 150kHz. Minimum off-time operation provides main switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions. An output phase reversal pin allows flexibility in configuration of converter types, including inverting and negative topologies.

File format: PDF Size:289 KB

The LTC1649 is a high power, high efficiency switching regulator controller optimized for use with very low supply voltages. It operates from 2.7V to 5V input, and provides a regulated output voltage from 1.26V to 2.5V at up to 20A load current. A typical 3.3V to 2.5V application features efficiency above 90% from 1A to 10A load. The LTC1649 uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or super-low-threshold devices. The LTC1649 shares its internal switching architecture with the LTC1430, and features the same ±1% line, load and temperature regulation characteristics. Current limit is user-adjustable without requiring an external low-value sense resistor.

File format: PDF Size:214 KB

File format: PDF Size:0 KB

This document is about LT1676, which is a wide input range, high efficiency Buck (step-down) switching regulator. The part can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current.

File format: PDF Size:141 KB