The LT6202/LT6203/LT6204 are single/dual/quad low noise, rail-to-rail input and output unity gain stable op amps that feature 1.9nV/?Hz noise voltage and draw only 2.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 100MHz gain bandwidth product, a 25V/?s slew rate, and are optimized for low supply signal conditioning systems.These amplifiers maintain their performance for supplies from 2.5V to 12.6V and are specified at 3V, 5V and ?5V supplies. Harmonic distortion is less than ? 80dBc at 1MHz making these amplifiers suitable in low power data acquisition systems.The LT6202 is available in the 5-pin TSOT-23 and the 8-pin SO, while the LT6203 comes in 8-pin SO and MSOP packages with standard op amp pinouts. For compact layouts the LT6203 is also available in a tiny fine line leadless package (DFN), while the quad LT6204 is available in the 16-pin SSOP and 14-pin SO packages. These devices can be used as plug-in replacements for many op amps to improve input/output range and noise performance.Applications Low Noise, Low Power Signal Processing Active Filters Rail-to-Rail Buffer Amplifiers Driving A/D Converters DSL Receivers Battery Powered/Battery Backed Equipment

DC606A: Demo Board for the LTC4056-4.2 Linear Li-Ion Charger with Termination in ThinSOT.

Demonstration Circuit 616 is a synchronous, 4-phase boost converter using the LTC3425. It is capable of operating below 1V input. DC616A is set for 3.3V output. DC616B is set for 5V output. On each demo board, the left circuit gives higher efficiency and current rating; while the right circuit has smaller size and lower cost. The switching frequency is set at 1MHz per phase, minimizing inductor and capacitor size. A single resistor at RT pin sets the frequency. If desired, the LTC3425 can be synchronized to an external clock.

The LT3781 controller simplifies the design of high power synchronous dual transistor forward DC/DC converters. The part employs fixed frequency current mode control and supports both isolated and nonisolated topologies. The IC drives external N-channel power MOSFETs and operates with input voltages up to 72V.The LT3781 is ideal for output derived power schemes, through the use of a large undervoltage lockout hysteresis range. The part is also equipped with an 18V VCC shunt regulator, which prevents exceeding absolute maximum ratings while in trickle start applications.The LT3781?s operating frequency is programmable and can be synchronized up to 350kHz. Switch phase is also controlled during synchronized operation to accommodate multiple-converter systems. Internal logic guarantees 50% maximum duty cycle operation to prevent transformer saturation.The LT3781 is available in a 20-lead SSOP package.Applications Isolated Telecommunication Systems Personal Computers and Peripherals Distributed Power Step-Down Converters Lead Acid Battery Backup Systems Automotive and Heavy Equipment

DC661A-A: Demo Board for the LT3468 Photoflash Capacitor Chargers in ThinSOT.

The LT5517 is a 40MHz to 900MHz quadrature demodulator optimized for high linearity receiver applications where high dynamic range is important. It is suitable for communications receivers where an RF or IF signal is directly converted into I and Q baseband signals with a bandwidth up to 130MHz. The LT5517 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, broadband quadrature generator derived from an on-chip divide-by-two circuit.The superior linearity and low noise performance of the LT5517 is achieved across its full frequency range. A well-balanced divide-by-two circuit generates precision quadrature LO carriers to drive the I mixer and the Q mixer. Consequently, the outputs of the I-channel and the Q-channel are well matched in amplitude, and their phases are 90? apart. The LT5517 also provides excellent 50? impedance matching at the 2XLO port across its entire frequency range.Applications Wireless Infrastructure High Linearity Direct Conversion I/Q Receiver High Linearity I/Q Demodulator

DC689A: Demo Board for the LT5522 600MHz to 2.7GHz High Signal Level Downconverting Mixer.

DC696A: Demo Board for the LT5546 40MHz to 500MHz VGA and I/Q Demodulator with 17MHz Baseband Bandwidth.

Demonstration circuit 700 is a 2.4MHz, Dual Phase Step-Up DC/DC Converter featuring the LTC3428EDD. The demo board demonstrates a dual phase DC/DC boost converter, with a 2A switch (per phase), capable of providing either 5V at 2A or 3.3V at 1.5A. The circuit demonstrates the advantages of the dual phase architecture for an effective switching frequency of 2.4MHz.

DC708A: Demo Board for the LTC4064 Monolithic Linear Charger for Back-Up Li-Ion Batteries.