Demonstration circuit 1587A is a boost converter optimized for relatively high impedance, very low voltage input power sources. It allows a user to quickly evaluate the LTC3105 boost converter and LDO regulator. Capable of operating with an input voltage as low as 250mV and as high as 5V, the circuit features maximum power point control (MPPC). Jumpers on the circuit board allow the user to select several MPPC voltages, three boost output voltages and three LDO regulator output voltages. Also included are jumpers for shutdown and for selecting an external pull-up voltage for the power good status output. Terminals are provided for input and output connections, power good output and external power good supply input, shutdown input, and provisions for external MPPC resistor and MPPC diode input. This demonstration board is especially designed for low power solar cell applications.

Demonstration circuit 1590B is a dual output synchronous buck converter featuring the LTC3880EUJ, a dual output peak current mode controller with digital power system management. There are two versions of the board available: DC1590B-A senses the output current across a sense resistor and has a default switching frequency of 350kHz, and DC1590B-B senses output current with the inductor DCR and has a default switching frequency of 425kHz. Either version can be populated with the LTC3880EUJ-1 (which allows the user to provide bias power to the IC from an external power supply) instead of the LTC3880EUJ. These boards provide two programmable outputs of 20A each. The factory default settings are 1.8V for each output.

DC1593A-A: Demo Board for the LTC2635-12 Quad 12-Bit I2C VOUT DACs with 10ppm/°C Reference.

The LTC4219 is an integrated solution for Hot Swap applications that allows a board to be safely inserted and removed from a live backplane. The part integrates a Hot Swap controller, power MOSFET and current sense resistor in a single package for small form factor applications. The LTC4219 provides separate inrush current control and a 10% accurate 5.6A current limit with foldback current limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit and power good monitoring are also provided. The power good detection level and foldback current limit profile are internally preset for 5V (LTC4219-5) and 12V (LTC4219-12) applications.Applications RAID Systems Server I/O Cards Industrial

Demonstration Circuit 1598A is a fixed frequency synchronous buck-boost converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below, or equal to the output voltage. The LTC3112 features selectable PWM or Burst Mode operation, and an easily synchronizable oscillator. An output current monitor allows the load current to be controlled or monitored. The LTC3112 operates with a 2.7V to 15V input voltage range and a VOUT range from 2.5V to 14V. The demonstration board has been designed to operate with VIN from 2.7V to 15V and an output current up to 2.5A. For VIN < 5V, IOUT capability is reduced. VOUT is set to 5.0V.

DC159A-B: Demo Board for the LT1425 Isolated Flyback Switching Regulators.

Demonstration circuit 1614 features the LTC4012CUF, a multi-chemistry single battery charger controller with PowerPath™ control. The input supply voltage is 13.5V to 20V and is initially configured for a current limit of 10A. The charger float voltage is programmed by jumpers to support 1- to 4- series cells of both Li-Ion/Polymer and Li-iron phosphate (LiFePO4) at 4.2V/cell and 3.6V/cell, for a total of eight settings. The demo board is initially configured for constant-voltage charging of a 12.6V Li-Ion/ Polymer battery and constant-current charging at 8A, though current derating may be necessary due to certain operating conditions.

The AD5544/AD5554 quad, 16-/14-bit, current output, digital-to-analog converters (DACs) are designed to operate from 2.7 V to 5.5 V supply range.The applied external reference input voltage (VREFX) determines the full-scale output current. Integrated feedback resistors (RFB) provide temperature-tracking, full-scale voltage outputs when combined with an external I-to-V precision amplifier.A double-buffered serial data interface offers high speed, 3-wire, SPI- and microcontroller-compatible inputs using serial data in (SDI), a chip select (CS), and clock (CLK) signals. In addition, a serial data out pin (SDO) allows for daisy-chaining when multiple packages are used. A common, level-sensitive, load DAC strobe (LDAC) input allows the simultaneous update of all DAC outputs from previously loaded input registers. Additionally, an internal power-on reset forces the output voltage to 0 at system turn-on. An MSB pin allows system reset assertion (RS) to force all registers to zero code when MSB = 0, or to half-scale code when MSB = 1.The AD5544 is packaged in the compact 28-lead SSOP and 32-lead LFCSP. ?The AD5554 is ?packaged in the compact 28-lead SSOP.Applications Automatic test equipment Instrumentation Digitally controlled calibration

The ADF4153 is a fractional-N frequency synthesizer that implements local oscillators in the upconversion and downconversion sections of wireless receivers and transmitters. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. There is a ?-? based fractional interpolator to allow programmable fractional-N division. The INT, FRAC, and MOD registers define an overall N divider (N = (INT + (FRAC/MOD))). In addition, the 4-bit reference counter (R counter) allows selectable REFIN frequencies at the PFD input. A complete phase- locked loop (PLL) can be implemented if the synthesizer is used with an external loop filter and a voltage controlled oscillator (VCO).A simple 3-wire interface controls all on-chip registers. The device operates with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use.Applications CATV equipment Base stations for mobile radio (GSM, PCS, DCS, WiMAX, SuperCell 3G, CDMA, W-CDMA) Wireless handsets (GSM, PCS, DCS, CDMA, W-CDMA) Wireless LANs, PMR Communications test equipment

The ADF4155 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers when used with an external loop filter, external voltage controlled oscillator (VCO), and external reference frequency.The ADF4155 is for use with external VCO parts up to an 8 GHz operating frequency. The high resolution programmable modulus allows synthesis of exact frequencies with 0 Hz error.The VCO frequency can be divided by 1, 2, 4, 8, 16, 32, or 64 to allow the user to generate RF output frequencies as low as 7.8125 MHz.Control of all on-chip registers is through a simple 3-wire interface. The device operates with a nominal power supply of 3.3 V ? 5% and can be powered down when not in use.The ADF4155 is available in a 24-lead, 4 mm ? 4 mm LFCSP package.APPLICATIONS Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM, PCS, DCS, DECT) Point to point/point to multipoint microwave links Test equipment Wireless LANs, CATV equipment Clock generation