LINEAR Manuals

LT3012 is a high voltage, micropower, low dropout linear regulator. The device is capable of supplying 250mA of output current with a dropout voltage of 400mV. Designed for use in battery-powered or high voltage systems, the low quiescent current (operating 40µA, shutdown 1µA) makes the LT3012 an ideal choice. Quiescent current is also well controlled in dropout. Other features of the LT3012 include the ability to operate with very small output capacitors. The regulator is stable with only 3.3µF on the output while most older devices require between 10µF and 100µF for stability. Small ceramic capacitors can be used without any need for series resistance (ESR) as is common with other regulators. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection. The device is available with an adjustable output with a 1.24V reference voltage. The LT3012 regulator is available in the 16-lead TSSOP and 12 pin low profile (0.75mm) (4mm × 3mm) DFN packages with an exposed pad for enhanced thermal handling capability.

This document introduces the LTC3831, a high power, high efficiency DDR memory termination switching regulator controller. The device uses a synchronous switching architecture with N-channel MOSFETs, and the output voltage is equal to 1/2 of the external supply or reference voltage. The LTC3831 can sense output current and regulate it through the drain-source resistance of the upper N-channel MOSFET, thereby providing adjustable current limit without a current sense resistor. The device can operate with a supply voltage as low as 3V and with a maximum duty cycle of >91%. It includes a fixed frequency PWM oscillator for low output ripple operation.

The LTM4602 is a 6A high efficiency DC/DC step-down power supply, suitable for telecom and networking equipment, servers, industrial equipment, etc.

The LT4250L/LT4250H is a negative 48V hot swap controller that allows a board to be safely inserted and removed from a live backplane. By controlling the gate voltage of an external N-channel pass transistor, inrush current is limited to a programmable value. If the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold, the pass transistor is turned off. A programmable current limit protects the system against shorts. After a 500µs timeout, the current limit activates the electronic circuit breaker. The PWRGD (LT4250L) or PWRGD (LT4250H) signal can be used to directly enable a power module. The LT4250L is designed for modules with a low enable input and the LT4250H for modules with a high enable input. The LT4250L/LT4250H are available in 8-pin PDIP and SO packages.

LT1078/LT1079 are micropower, dual and quad, single supply, precision op amps. They feature low supply current, low offset voltage, and low noise.

The LT3023 is a dual, micropower, low noise, low dropout regulator. It can provide 100mA of output current with a dropout voltage of 300mV. Its quiescent current is 20μA and its shutdown current is less than 0.1μA.

LTC1733 is a single-chip lithium-ion battery constant-current/constant-voltage linear charger with an on-chip power MOSFET. Internal thermal feedback regulates the charge current to limit die temperature during high power operation or high ambient temperature conditions. No external current sense resistor is needed and no blocking diode is required due to the internal MOSFET architecture. The charge current and charge time can be set externally with a single resistor and capacitor.

The LTC4412 is a low-loss PowerPathTM controller that replaces traditional low-voltage OR’ing diodes, has minimal external components, automatic switching between DC sources, load sharing, low quiescent current, and is suitable for mobile phones, notebook computers, digital cameras, USB peripherals, UPS and other applications.

LT6011/LT6012 is a low noise, high precision input performance, low power consumption, rail to rail output swing precision operational amplifier. Input offset voltage can be trimmed to less than 60μV. Low drift and excellent long-term stability guarantee high accuracy over temperature and time. The maximum input bias current of 300pA and the minimum voltage gain of 120dB further maintain this precision over operating conditions. LT6011/LT6012 can operate at any power supply voltage from 2.7V to 36V and draw only 135μA of supply current on a 5V supply. The output swings to within 40mV of either supply rail, making the amplifier a good choice for low voltage single supply applications. LT6011/LT6012 are specified at 5V and ±15V supplies and from -40°C to 85°C. LT6011 (dual) is available in SO-8, MS8 and space saving 3mm x 3mm DFN package.

The LTC2433-1 is a 16-bit analog-to-digital converter with micropower, no latency ∆ΣTM technology, single conversion digital filter, etc.

The LTC 3440 is a high efficiency, fixed frequency, Buck- Boost DC/DC converter that operates from input voltages above, below or equal to the output voltage

The LT3012B is a high voltage, micropower low dropout linear regulator. The device is capable of supplying 250mA of output current with a dropout voltage of 400mV. Designed for use in battery-powered or high voltage systems, the low quiescent current (40µA operating) makes the LT3012B an ideal choice. Quiescent current is also well controlled in dropout. Other features of the LT3012B include the ability to operate with very small output capacitors. The regulators are stable with only 3.3µF on the output while most older devices require between 10µF and 100µF for stability. Small ceramic capacitors can be used without any need for series resistance (ESR) as is common with other regulators. Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection. The device is available with an adjustable output with a 1.24V reference voltage.

The LT3825 is an isolated switching regulator controller designed for medium power flyback topologies. It features sensing output voltage directly from the primary side winding without an optoisolator, improving dynamic response and reliability. It also has synchronous rectification to increase converter efficiency and improve output cross regulation in multiple output converters. The LT3825 operates in forced continuous conduction mode, improving cross regulation.

The LTC660 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range of 1.5V to 5.5V, resulting in complementary output voltages of –1.5V to –5.5V. It also performs a doubling at an input voltage range of 2.5V to 5.5V, resulting in a doubled output voltage of 5V to 11V. Only two external capacitors are needed for the charge pump and charge reservoir functions. The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs at a 10kHz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the BOOST pin is tied to V+. The LTC660 contains an internal oscillator, divide-by-two, voltage level shifter and four power MOSFETs. It is suitable for converting 5V to ±5V supplies, inexpensive negative supplies, data acquisition systems, and as a high current upgrade to LTC1044 or LTC7660.