DC264A: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

The LTC6363 family consists of four fully differential, low power, low noise amplifiers with rail-to-rail outputs optimized to drive SAR ADCs. The LTC6363 is a standalone differential amplifier, where the gain is typically set using four external resistors. The LTC6363-0.5, LTC6363-1, and LTC6363-2 each have internal matched resistors to create fixed gain blocks with gains of 0.5V/V, 1V/V, and 2V/V respectively. Each of the fixed-gain amplifiers features precision laser trimmed on-chip resistors for accurate, ultrastable gain and excellent CMRR.Applications 20-Bit, 18-Bit and 16-Bit SAR ADC Drivers Single-Ended-to-Differential Conversion Low Power ADC Drivers Level Shifter Differential Line Drivers Battery-Powered Instrumentation

DC265A: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

Demonstration circuit DC266B-A is for the evaluation of 8th order filter circuits using an LTC1562 (no dash) and DC266B-B for an LTC1562-2. LTC1562 and LTC1562-2 are quad 2nd order active-RC filter building blocks. Each 2nd order section has an integrator trimmed with internal capacitors and resistors to 100kHz and 200 kHz for the LTC1562 and LTC1562-2 respectively. The trimmed frequency error is ±0.6% for the LTC1562A and ±1.5% for the LTC1562-2. The LTC1562 or LTC1562-2 2nd order sections can be configured with external resistors to implement lowpass, bandpass or highpass filters.

Demonstration circuit 2672A-A is a complete non-isolated 48V input, dual-output, high efficiency, high density µModule regulator with 30V to 58V input range. Each output can supply 25A maximum load current. The demo board has a LTM4664 µModule regulator, which is a dual 25A or single 50A step-down regulator with digital power system management. Please see the LTM4664 datasheet for more detailed information. DC2672A-A powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay™ onto your PC and use ADI’s I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.

Demonstration circuit 2707B uses the LTC®4418 to arbitrate between two input supply rails, selecting the highest priority, valid supply to power the load. The V1 rail is defined to have higher priority and the V2 rail has lower priority. Both rails have individual overvoltage and undervoltage comparators for setting valid window thresholds with external resistive dividers. If the highest priority rail voltage V1 falls out of the defined window (overvoltage or undervoltage), the V2 rail, if it is valid, is enabled and powers the load. Two or more LTC4418s can be cascaded to provide switchover between more than two rails.

The LTC1772 is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772 when the input voltage falls below 2.0V.The LTC1772 provides a ?2.5% output voltage accuracy and consumes only 270?A of quiescent current. For applications where efficiency is a prime consideration, the LTC1772 is configured for Burst Mode operation, which enhances efficiency at low output current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).In shutdown, the device draws a mere 8?A. High constant operating frequency of 550kHz allows the use of a small external inductor.The LTC1772 is available in a small footprint 6-lead SOT-23. Burst Mode LTC1772 Yes LTC1772B No Applications One or Two Lithium-Ion-Powered Applications Cellular Telephones Wireless Modems Portable Computers Distributed 3.3V, 2.5V or 1.8V Power Systems Scanners

Demonstration circuit 2718A is a no-opto flyback converter featuring the LT8316. The demo board outputs 12V and maintains tight regulation with a load current from 30mA to 3A. It is optimized to operate over a wide 100V to 600V DC input voltage range. Output voltage accuracy stays within ±5% over the entire input voltage and load range. The LT8316 is a high voltage flyback controller. No optoisolator is needed for regulation. The part samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant boundary mode operation improves load regulation. The LT8316 is available in a thermally enhanced 20-pin TSSOP package with four pins removed for high-voltage spacing. The LT8316 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2718A.

Demonstration Circuit DC2748A features the LTC3315B dual 5V, 2A Synchronous Step-Down DC/DC regulators operating at 6MHz. One regulator provides a 1.8V output and the other provides 2.0V, both up to a 2A load. The LTC3315B supports adjustable output voltages from 0.5V to VIN, operating frequencies from 3MHz up to 10MHz. The LTC3315B is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. Fast minimum on-time of 25ns enables high VIN to low VOUT conversion at high frequency. The DC2748A operating mode may be selected as Burst Mode operation, Skip mode or Forced Continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3315B to sync to a clock frequency from 3MHz to 10MHz. The LTC3315B operates in Forced Continuous mode when syncing to an external clock. The LTC3315B data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with the demo manual. The LTC3315B is assembled in a 2mm × 2mm LQFN package with exposed pads for low thermal resistance. The PCB Considerations section in the data sheet. The Efficiency vs Load graph on the demo manual shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.

The ADF4355 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers when used with an external loop filter and an external reference frequency. A series of frequency dividers permits operation from 54 MHz to 6800 MHz.The ADF4355 has an integrated VCO with a fundamental output frequency ranging from 3400 MHz to 6800 MHz. In addition, the VCO frequency is connected to divide by 1, 2, 4, 8, 16, 32, or 64 circuits that allow the user to generate radio frequency (RF) output frequencies as low as 54 MHz. For applications that require isolation, the RF output stage can be muted. The mute function is both pin and software controllable.Control of all on-chip registers is through a simple 3-wire interface. The ADF4355 operates with analog and digital power supplies ranging from 3.15 V to 3.45 V, with charge pump and VCO supplies from 4.75 V to 5.25 V. The ADF4355 also contains hardware and software power-down modes.Applications Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM, PCS, DCS, DECT) Point to point/point to multipoint microwave links Satellites/VSATs Test equipment/instrumentation Clock generation