Demonstration circuit 1106 is a 1.5A Buck Converter, 1.5A Boost Converter, and LDO Controller featuring the LT3570. The Buck is designed to convert a 4V to 36V source to 3.3V at 1A. The LDO is powered from the output of the buck and converts 3.3V to 2.5V at 100mA. The boost converts a 3.3V to 10V source to 12V at 275mA.

Demonstration circuit DC1154 is a Telecom non isolated DC/DC converter featuring the LTC3873 constant frequency current mode flyback controller. The DC1154 converts 36V to 72V input voltage to an isolated 3A of output current at 3.3V. The 200kHz constant frequency operation is maintained down to very light load to reduce low frequency noise generated over a wide range of load current. The DC1154 also provides an isolated design by installing the optocoupler and LTC4430 related circuitry. The demonstration circuit can be easily modified to generate different output voltages up to 15V. As output voltage is increased, the maximum output current must be reduced to limit the output power to no more than 10W.

The ADA4350 is an analog front end for photodetectors or othersensors whose output produces a current proportional to thesensed parameter or voltage input applications where the systemrequires the user to select between very precise gain levels tomaximize the dynamic range.The ADA4350 integrates a FET input amplifier, a switching network,and an ADC driver with all functions controllable via a serialperipheral interface (SPI) or parallel control logic into a singleIC. The FET input amplifier has very low voltage noise and currentnoise making it an excellent choice to work with a wide range ofphotodetectors, sensors, or precision data acquisition systems.Its switching network allows the user individual selection of upto six different, externally configurable feedback networks; byusing external components for the feedback network, the usercan more easily match the system to their desired photodetector orsensor capacitance. This feature also allows the use of low thermaldrift resistors, if required.The design of the switches minimizes error sources so that theyadd virtually no error in the signal path. The output driver canbe used in either single-ended or a differential mode and isideal for driving the input of an ADC.The ADA4350 can operate from a single +3.3 V supply or a dual?5 V supply, offering user flexibility when choosing the polarity ofthe detector. It is available in a Pb-free, 28-lead TSSOP package andis specified to operate over the ?40?C to +85?C temperature range.Multifunction pin names may be referenced by their relevantfunction only.Applications Current to voltage (I to V) conversions Photodiode preamplifiers Chemical analyzers Mass spectrometry Molecular spectroscopy Laser/LED receivers Data acquisition systems

Demonstration circuit 2896A-B demonstrates a high power boost converter and features the LT®8551 the phase expander with internal gate drivers. The DC2896A-B employs LTC3769, a single-phase boost controller as primary controller and LT8551 as the phase expander which added four more power phases. The increased number of power sections connected to the LT8551, results in greater higher level output power without a corresponding increase in the difficulty of the design or a sacrifice of primary controller LTC3769 features. The input voltage range of DC2896A-B is from 10V to 46V and the output is 48V. The maximum input current is 12A per power section, so the maximum input current of DC2896A-B is 60A. It’s reflected to 30A of output current and output power of 1,440W at an input voltage of 24V. Correspondingly output current will drop to 14.5A and output power will to 720W at a 12V input voltage, to keep the input current at the same level of 60A. Both values will increase at higher voltages. The input current value can be increased above 60A, if heat sinks are installed, see parts list below. The switching frequency is 250kHz and at a 24V input to 48VOUT at full load, the efficiency of DC2896A-B is 98%. As the input voltage decreases, the output current should be decreased as well, to prevent saturation of the DC2896A-B inductors, the derating curve presented on Figure 3. Efficiency curves presented on Figure 4. DC2896A-B resistors R114 to R119 program the phase relationship between the power sections, by setting the Total Distinct Phase Number (TDPN). For increasing efficiency and reducing switching losses at light loads DC2896A-B supports disconnecting some power sections. This mode of operation designated as the stage shedding and it is programed by the jumper J3 STAGE SHED. Jumper JP1 programs the LT8551 SYNC pin and it allows DC2896A-B to be synchronized to an external clock. The print circuit board of DC2896A also supports two phase expander controllers, the LT8561 and LT8551, with versions DC2896A-A and DC2896A-B correspondingly. The table [1] in the electrical schematic describes differences between both versions, including controller biasing and gate drive voltages. DC2896A-B has jumper SHDN (JP2) for manually enable or disable controller. The SYNC (E19) input can be used to sync LT8551 with an external signal. There are also terminals that make it easy to monitor the control logic of the LT8551 functional. The current sense resistors RSNS1 to RSNS5 used for implementation of current mode control, monitoring and sharing current between the phases. To further increase efficiency DC2896A-B supports optional DCR sensing of inductors L1 to L5. DC2896A-B includes sense line filters and filter options for inputs to the LT8551 in accordance with data sheet recommendations. Undervoltage shutdown, switching frequency and LT8551 ILIM current limit levels can all be adjusted by resistors or resistor jumpers. DC2896A-B comes with a housekeeping circuit based on U3 controller. It reduces the power dissipation that would otherwise occur at high input voltages in regulator transistor Q21. The housekeeping circuit also stabilizes converter biasing at sudden input voltage drops. A high level of available output power without a corresponding high level of design complexity makes the LT8551 attractive for high power DC bus and battery systems in commercial, industrial and automotive settings. DC2896A-B features the LT8551EUKG in a thermally enhanced 52-pin 7mm × 8mm QFN package. The LT8551 and LTC3769 data sheets must be read in conjunction with this demo manual to properly use or modify DC2896A-B.

Demonstration circuit 1311 is a Telecom isolated DC/DC converter featuring the LTC3805/-5 constant frequency current mode flyback controller. The DC1311 converts an 18V to 72V input voltage to an isolated 3A of output current at 3.3V. The 300kHz constant frequency operation is maintained down to very light load to reduce low frequency noise generated over a wide range of load current. The converter provides high output voltage accuracy (typically ±2%) over wide load range with no minimum load requirement. The DC1311 also provides non-isolated design by removing opto coupler and LTC4430 circuit. The demonstration circuit can be easily modified to generate different output voltages up to 15V.

The LTC4061-4.4 is a full-featured, flexible, standalone linear charger for single-cell 4.375V Lithium-Ion batteries. It is capable of operating within USB power specifications.Both programmable time and programmable current based termination schemes are available. Furthermore, the CHRG open-drain status pin can be programmed to indicate the battery charge state according to the needs of the application. Additional safety features designed to maximize battery lifetime and reliability include NTC battery temperature sensing and the SmartStart charging algorithm.No external sense resistor or external blocking diode is required for charging due to the internal MOSFET architecture. Internal thermal feedback regulates the charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The charge current is programmed with an external resistor. With power applied, the LTC4061-4.4 can be put into shutdown mode to reduce the supply current to 20?A and the battery drain current to less than 5?A.Other features include smart recharge, USB C/5 current programming input, undervoltage lockout and AC Present logic output.? Float Voltage (V) LTC4061 4.2V LTC4061-4.4 4.4V Applications Handheld Computers Portable MP3 Players Digital Cameras

The ADN8835 is a monolithic TEC controller with an integrated TEC controller. It has a linear power stage, a pulse-width modulation (PWM) power stage, and two zero-drift, rail-to-rail chopper amplifiers. The linear controller works with the PWM driver to control the internal power MOSFETs in an H bridge configuration. By measuring the thermal sensor feedback voltage and using the integrated operational amplifiers as a proportional integral differential (PID) compensator to condition the signal, the ADN8835 drives current through a TEC to settle the temperature of a laser diode or a passive component attached to the TEC module to the programmed target temperature.The ADN8835 supports negative temperature coefficient (NTC) thermistors as well as positive temperature coefficient (PTC) resistive temperature detectors (RTDs). The target temperature is set as an analog voltage input either from a digital-to-analog converter (DAC) or from an external resistor divider.The temperature control loop of the ADN8835 is stabilized by PID compensation utilizing the built in, zero-drift chopper amplifiers. The internal 2.50 V reference voltage provides a 1% accurate output that biases a thermistor temperature sensing bridge as well as a voltage divider network to program the maximum TEC current and voltage limits for both the heating and cooling modes. With the zero-drift chopper amplifiers, excellent long-term temperature stability is maintained via an autonomous analog temperature control loop.APPLICATIONS TEC temperature control Optical modules Optical fiber amplifiers Optical networking systems Instruments requiring TEC temperature control

Demonstration circuit 534 is a fast transient response, very low dropout linear regulator featuring the 4A output current LT3150 linear regulator controller. The DC534 has an input voltage range of 1.1V to 10V and generates a jumper-selectable output voltage of 1.2V, 1.5V or 1.8V. With the LT3150 driving external N-channel MOSFETs as source followers, the DC534 can produce very fast transient response. The proper selection of the Rds(on) of the MOSFETs allows dropout voltages below 300 mV. These capabilities, plus its ability to maintain stable operation with ceramic output capacitors, make the DC534 voltage regulator ideally suited for low VIN-to-VOUT applications, such as microprocessor/microcontroller/FPGA power supplies.

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

The LTC1436A/LTC1437A are synchronous step-down switching regulator controllers that drive external N-channel power MOSFETs in a phase lockable, fixed frequency architecture. The Adaptive Power? output stage selectively drives two N-channel MOSFETs at frequencies up to 400kHz while reducing switching losses to maintain high efficiencies at low output currents.An auxiliary 0.5A linear regulator using an external PNP pass device provides a low noise, low dropout voltage source. A secondary winding feedback control pin (SFB) guarantees regulation regardless of the load on the main output by forcing continuous operation.An additional comparator is available for use as a lowbattery detector. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (300ms typically) after the output is within 5% of the regulated output voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability.The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum).Applications Notebook and Palmtop Computers, PDAs Cellular Telephones and Wireless Modems Portable Instruments Battery-Operated Devices DC Power Distribution Systems