LINEAR Manuals

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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.

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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.

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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.

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The LT ®1389 is a nanopower, precision shunt voltage reference. The bandgap reference uses trimmed preci- sion thin-film resistors and improved curvature correction techniques to achieve 0.05% initial voltage accuracy with guaranteed 10ppm/°C maximum temperature drift.

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The LT3972 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 33V (62V Maximum). It features high efficiency, low ripple, fast transient response, and low quiescent current. It can also enhance low output current efficiency by reducing the output current.

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This product is a single-supply operational amplifier with low offset voltage, low drift, low input bias current, high gain, high common mode rejection ratio and high power supply rejection ratio.

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The LT ®1014 is the first precision quad operational amplifier which directly upgrades designs in the industry standard 14-pin DIP LM324/LM348/OP-11/4156 pin configuration.

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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.

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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.

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

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The product is a high voltage 3A, 500kHz step-down switching regulator with 100µA quiescent current.

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The LT1024 is a low-drift dual operational amplifier with extremely high common-mode rejection ratio and power-supply rejection ratio, making it ideal for high-precision applications.

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The LT1305 micropower high power DC/DC converter with low-battery detector provides 2-cell and 3-cell to 5V conversion for EL panel drivers and portable instruments.

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The LT3693 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 95m switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Shutdown 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 91% of the programmed output voltage. The LT3693 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.

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LTC690/LTC691 and LTC694/LTC695 are chips used for power supply monitoring and battery control in microprocessor systems. They provide functions such as microprocessor reset, battery backup, CMOS RAM write protection, power failure warning, and watchdog timing. They have a precise internal voltage reference and comparator circuit. When an out-of-tolerance condition occurs in the power supply line, the reset outputs are forced to active states and the chip enable output unconditionally write-protects external memory. In addition, the LTC690 series also has a precise voltage monitoring function for power failure or low battery warning. It is an upgrade for the MAX690 series.

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

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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.

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