LINEAR Manuals (Others)

The LT3491 is an efficient Li-Ion driver that provides up to 600mA of drive current for four white LEDs. The driver features a unique high side LED current sense that enables the LED string to be connected with one side to ground, which simplifies LED connection. The driver uses a fixed frequency step-up DC/DC converter that is specifically designed to drive up to six white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors.

File format: PDF Size:259 KB

The LT1073 is a versatile micropower DC/DC converter that only requires three external components to deliver a fixed output of 5V or 12V. With a minimum supply voltage of 1V, it can be used in applications where the primary power source is a single cell. An on-chip auxiliary gain block can function as a low-battery detector or linear post-regulator. The average current drain of the LT1073-5 used in the typical application circuit is just 135µA unloaded, making it ideal for applications where long battery life is important. The circuit shown can deliver 5V at 40mA from an input as low as 1.25V and 5V at 10mA from a 1V input. The device can easily be configured as a step-up or step-down converter, although for most step-down applications or input sources greater than 3V, the LT1173 is recommended. Switch current limiting is user-adjustable by adding a single external resistor. Unique reverse-battery protection circuitry limits reverse current to safe, nondestructive levels at reverse supply voltages up to 1.6V.

File format: PDF Size:254 KB

The LTC4253/LTC4253A negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current-limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions.

File format: PDF Size:343 KB

LTC1879 is a high efficiency synchronous step-down regulator from Linear Technology Corporation. It features a low quiescent current of 15µA and can be used in applications such as cellular telephones, portable computers, and wireless modems.

File format: PDF Size:257 KB

The LT3685 is an adjustable frequency (200kHz to 2.4MHz) monolithic step-down switching regulator that accepts input voltages up to 38V operating and 60V maximum. It features an internal overvoltage protection circuit that turns off the power switch when VIN is above 38V typical (36V minimum) which then allows the part to safely withstand 60V transients. Current mode topology is used for fast transient response and good loop stability. The high operating frequency of the LT3685 allows the use of small, low cost inductors and ceramic capacitors resulting in low output ripple while keeping total solution size to a minimum. The low current shutdown mode reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when VOUT reaches 86% of the programmed output voltage. The LT3685 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.

File format: PDF Size:302 KB

The LT1308A/LT1308B are high current, micropower single cell, 600kHz DC/DC converters. They can provide 5V at 1A from a single Li-Ion cell, or 5V at 800mA in SEPIC mode from four NiCd cells. The converters operate at a fixed frequency and have automatic Burst Mode/continuous switching at light loads. They are suitable for applications such as GSM/CDMA phones, digital cameras, LCD bias supplies, battery backup supplies, and handheld computers.

File format: PDF Size:778 KB

The LT1534/LT1534-1 are a new class of switching regulators designed to reduce conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by providing user control of the output switch slew rates. Voltage and current slew rates can be independently programmed to optimize switcher harmonic content versus efficiency. The LT1534/LT1534-1 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency. The LT1534/LT1534-1 utilize a current mode architecture optimized for low noise boost topologies. The ICs include a 2A power switch along with all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics. Protection features include cycle-by-cycle current limit protection, undervoltage lockout and thermal shutdown. Low minimum supply voltage and low supply current during shutdown make the LT1534/LT1534-1 well suited for portable applications. The LT1534/LT1534-1 are available in the 16-pin narrow SO package.

File format: PDF Size:206 KB

The LT1316 is a micropower step-up DC/DC converter that operates from an input voltage as low as 1.5V. It features a programmable input current limiting function that allows precise control of peak switch current. The peak switch current can be set to any value between 30mA and 500mA by adjusting one resistor. This is particularly useful for converters operating from high source impedance inputs. The converter utilizes a fixed off-time, variable on-time regulation scheme, resulting in a quiescent current of only 33µA in active mode. Quiescent current decreases to 3µA in shutdown mode with the low-battery detector still active. The LT1316 is suitable for applications such as battery backup, LCD bias, and low-power -48V to 5V/3.3V converters.

File format: PDF Size:301 KB

The LTC ®1440/LTC1441/LTC1442 are ultralow power single and dual comparators with built-in references.

File format: PDF Size:245 KB

LT1020 is a single monolithic chip combination of a micropower positive voltage regulator and a free collector comparator

File format: PDF Size:262 KB

The LT3434 is a high voltage power converter suitable for 14V and 42V automotive systems, industrial power systems, distributed power systems, and battery-powered systems. It features a wide input range (3.3V to 60V), 3A peak switch current, 100μA quiescent current, low power mode, and load dump protection.

File format: PDF Size:399 KB

The document is an application note about LT1505 1505fc battery charger. Its features include simple charging method, wide range of rechargeable batteries, high charging voltage accuracy, programmable charging current by resistor or DAC, and switching frequency up to 280kHz.

File format: PDF Size:161 KB

The LT3684 is an adjustable frequency (300kHz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum).

File format: PDF Size:327 KB

The LT1806/LT1807 are single/dual low noise rail-to-rail input and output unity-gain stable op amps that feature a 325MHz gain-bandwidth product, a 140V/µs slew rate and a 85mA output current. They are optimized for low voltage, high performance signal conditioning systems. The LT1806/LT1807 have a very low distortion of –80dBc at 5MHz, a low input referred noise voltage of 3.5nV/√Hz and a maximum offset voltage of 550µV that allows them to be used in high performance data acquisition systems. The LT1806/LT1807 have an input range that includes both supply rails and an output that swings within 20mV of either supply rail to maximize the signal dynamic range in low supply applications. The LT1806/LT1807 maintain their performance for supplies from 2.5V to 12.6V and are specified at 3V, 5V and ±5V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output. The LT1806 is available in an 8-pin SO package with the standard op amp pinout and a 6-pin SOT-23 package. The LT1807 features the standard dual op amp pinout and is available in 8-pin SO and MSOP packages.These devices can be used as plug-in replacements for many op amps to improve input/output range and performance.

File format: PDF Size:289 KB

The LT1815/LT1816/LT1817 are low power, high speed, very high slew rate operational amplifiers with excellent DC performance. The LT1815/LT1816/LT1817 feature higher bandwidth and slew rate, much lower input offset voltage and lower noise and distortion than other devices with comparable supply current. A programmable current option (LT1815 and LT1816A) allows power savings and flexibility by operating at reduced supply current and speed. The circuit topology is a voltage feedback amplifier with the slewing characteristics of a current feedback amplifier.

File format: PDF Size:367 KB

The LT1880 is a precision operational amplifier with high accuracy input performance and rail-to-rail output swing. It is suitable for applications such as thermocouple amplifiers, bridge transducer conditioners, instrumentation amplifiers, battery-powered systems, and photocurrent amplifiers.

File format: PDF Size:215 KB

The LT6010 is an operational amplifier that combines low noise and high precision input performance with low power consumption and rail-to-rail output swing. It has features such as maximum offset voltage of 35µV, maximum input bias current of 110pA, supply current of 135µA, rail-to-rail output swing, and minimum voltage gain of 120dB. The LT6010 is suitable for applications such as thermocouple amplifiers, precision photodiode amplifiers, instrumentation amplifiers, and battery-powered precision systems.

File format: PDF Size:292 KB

LT ®1801/LT1802 are dual/quad, low power, high speed rail-to-rail input and output operational amplifiers with excellent DC performance.

File format: PDF Size:539 KB

The LT1806/LT1807 are low noise, single/dual channel, rail to rail input and output unity gain stable op amps featuring a 325MHz gain bandwidth product, a 140V/μs slew rate and an 85mA output current. They are optimized for low voltage, high performance signal conditioning systems. The LT1806/LT1807 have a very low distortion of –80dBc at 5MHz, a low input referred noise voltage of 3.5nV/√Hz and a maximum offset voltage of 550μV that allows them to be used in high performance data acquisition systems. The LT1806/LT1807 have an input range that includes both supply rails and an output that swings within 20mV of either supply rail to maximize the signal dynamic range in low supply applications. The LT1806/LT1807 maintain their performance for supplies from 2.5V to 12.6V and are specifi ed at 3V, 5V and ±5V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output. The LT1806 is available in an 8-pin SO package with the standard op amp pinout and a 6-pin SOT-23 package. The LT1807 features the standard dual op amp pinout and is available in 8-pin SO and MSOP packages.These devices can be used as plug-in replacements for many op amps to improve input/output range and performance.

File format: PDF Size:289 KB