LINEAR Manuals

The LT ®1506 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1374 but optimized for lower input voltage applications. It will operate over a 4V to 15V input range compared with 5.5V to 25V for the LT1374. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available. A special high speed bipolar process and new design tech- niques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by keeping quiescent supply current to 4mA and by utiliz- ing a supply boost capacitor to saturate the power switch. The LT1506 fits into standard 7-pin DD and fused lead SO-8 packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors. There is the optional function of shutdown or synchronization.

This document introduces the features and characteristics of the LT1086 series products, including adjustable or fixed 3.3V, 3.6V, 5V, 12V output voltage, 1.5A output current, 1V input-output differential, guaranteed voltage drop at multiple current levels, 0.015% line regulation, 0.1% load regulation, 100% thermal limit functional test, >75dB ripple rejection.

The LT1991 is a low-power, high-precision operational amplifier with adjustable gain that is suitable for use in differential amplifier circuits. The device is available in a 10-lead MSOP and a low profile (0.8mm) 3mm x 3mm DFN package.

This document introduces the features and characteristics of LTC2401/LTC2402 1-/2-Channel 24-Bit µPower No Latency ∆ΣTMADCs in MSOP-10.

The LTC2482 is a high-precision, low-power, high-speed 16-bit single-channel analog-to-digital converter that utilizes the No Latency ∆Σ architecture and Easy Drive technology to achieve true latency-free operation. It also features single-supply operation, fully differential inputs, an internal oscillator, and a 10-pin DFN package

The document introduces the features of the LTC3783 LED driver and boost, flyback and SEPIC controller.

The LTC2440 is a high speed 24-bit No Latency Δ∑TM ADC with 5ppm INL and 5μV offset. It uses proprietary delta-sigma architecture enabling variable speed and resolution with no latency. Ten speed/resolution combinations (6.9Hz/200nVRMS to 3.5kHz/25μVRMS) are programmed through a simple serial interface. Alternatively, by tying a single pin HIGH or LOW, a fast (880Hz/2μVRMS) or ultralow noise (6.9Hz, 200nVRMS, 50/60Hz rejection) speed/resolution combination can be easily selected.

The LTC2440 is a high speed 24-bit No Latency Δ∑TM ADC with 5ppm INL and 5µV offset. It uses proprietary delta-sigma architecture enabling variable speed and reso- lution with no latency.

The LTC3802 is a dual switching regulator controller optimized for high efficiency step-down conversion from input voltages between 3V to 30V. The controller uses a leading edge modulation scheme to allow extremely low duty cycle operation. The constant frequency voltage mode controller allows a phase-lockable frequency between 330kHz and 750kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages 180° out-of-phase.

The LT4220 is a dual voltage hot swap controller from Linear Technology Corporation that supports positive and negative two-way power, has overcurrent limiting, power tracking, and switch tube shutdown functions, and is used in RAID systems, –5.2V ECL power supplies, industrial controls, and other scenarios.

LTC3830/LTC3830-1 3830fa high power step-down synchronous DC/DC controllers for low voltage operation

LTC3862 is a two phase constant frequency, current mode boost and SEPIC controller that drives N-channel power MOSFETs. It has adjustable slope compensation gain to optimize the current loop gain and improve noise immunity. The operating frequency can be set with an external resistor over a 75kHz to 500kHz range and can be synchronized to an external clock using the internal PLL. Multi-phase operation is possible using the SYNC input, the CLKOUT output and the PHASEMODE control pin allowing 2-, 3-, 4-, 6- or 12-phase operation. Other features include an internal 5V LDO with undervoltage lockout protection for the gate drivers, a precision RUN pin threshold with programmable hysteresis, soft-start and programmable leading edge blanking and maximum duty cycle.

The LTC®3441 is a high efficiency, fixed frequency, buck-boost DC/DC converter that operates efficiently from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous trans- fer function through all operating modes, making the prod- uct ideal for single lithium ion or multicell applications where the output voltage is within the battery voltage range. The device includes two 0.10Ω N-channel MOSFET switches and two 0.11Ω P-channel switches. External Schottky diodes are optional, and can be used for a moderate efficiency improvement. The operating frequen- cy is 1MHz, and can be synchronized via external components. The device features a ≤25µA quiescent current, which allows true output disconnect in standby mode. The device is available in a thermally enhanced 12-lead (4mm × 3mm) DFN package.

The LTC3557/LTC3557-1 is a highly integrated power management and battery charger IC for single cell Li-Ion/ Polymer battery applications. It includes a PowerPathTM manager with automatic load prioritization, a battery charger, an ideal diode and numerous internal protection features. Designed specifically for USB applications, the LTC3557/LTC3557-1 power manager automatically limits input current to a maximum of either 100mA or 500mA for USB applications or 1A for wall adapter powered applications. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit. The LTC3557/LTC3557-1 also includes three adjustable synchronous step-down switching regulators and a high voltage buck regulator output controller with Bat-Track that allows efficient charging from supplies as high as 38V. The LTC3557/LTC3557-1 is available in a low profile 4mm × 4mm × 0.75mm 28-pin QFN package.

The LTC3711 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 0.925V and 2.000V is selected by a 5-bit code (Intel mobile VID specification). The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT. Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling discontinuous mode operation when the main output is lightly loaded.