Demonstration Circuit DC1702A is a Li-Ion/Polymer Shunt Battery Charger system with Low Battery Disconnect featuring the LTC4071EDDB. The LTC4071 allows simple charging of Li-Ion/Polymer batteries from very low current, intermittent or continuous charging sources. The DC1702 provides up to 50mA of output current at 4.1V from a 10V to 16V input supply. A near-zero current low battery latching disconnect function protects even the lowest capacity batteries from deep discharge and potentially irreparable damage. The 550nA to 50mA operating current makes charging possible from previously unusable sources. With its low operating current the LTC4071 is well suited to charge low capacity Li-Ion or thin film batteries in energy harvesting applications.

Demonstration circuit 1703A features the LTC2655 quad 16-/12-bit DAC. The LTC2655 is a family of 16-/12- bit rail-to-rail DACs with integrated 10ppm/°C maximum reference. The LTC2655 advances performance standards for output drive, crosstalk and load regulation in single supply, voltage-output multiple DACs.

The LTC4280 Hot Swap? controller allows a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, board supply voltage and inrush current are ramped up at an adjustable rate. An I2C interface and onboard ADC allow for monitoring of load current, voltage and fault status.The device features adjustable analog foldback current limit and a FILTER pin which configures the time spent in overcurrent before declaring a fault. An I2C interface may configure the part to latch off or automatically restart after the LTC4280 detects a current limit fault.The controller has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card, and power-up either automatically upon insertion or wait for an I2C command to turn on.Applications Live Board Insertion Electronic Circuit Breakers Computers, Servers Platform Management

Demonstration circuit 1707 is a high efficiency monolithic step-down DC/DC switching regulator designed for double-data-rate (DDR) memory termination in computer systems. The VTT output is capable of sourcing and sinking up to 6A with an output voltage equal to one-half the voltage applied to the VDDQIN terminal or one-half the input supply voltage, selected by a jumper. An additional low current output (VTTR) also equal to one-half the voltage on VDDQIN can source and sink up to 10mA. Input voltage range is from 2.25V to 5.5V with overvoltage protection for transients exceeding 6.5V.

DC1724A is a μModule® step-down converter, featuring the LTM8029, which consumes only 5μA of quiescent current. The demo circuit is designed for a 5V, 600mA output at an operating frequency of 600kHz. The input voltage range is from 5.6V to 36V. If the input voltage decreases towards the programmed output voltage, the LT3973 will start to skip switch-off times and decrease the switching frequency to maintain output regulation up to a maximum duty cycle of approximately 97.5%.

Demonstration circuit 1725A features LT3759 in a 485kHz boost converter, designed for a 5V/2A output from a 1.8V to 4.5V input. The LT3759 is a current mode DC/DC Boost/SEPIC/Inverting controller operating over an input range of 1.6V to 42V. Thanks to a novel FBX pin architecture, the LT3759 allows both positive and negative output feedback voltages.

The LT3641 is a dual channel, current mode monolithic buck switching regulator with a power-on reset and a watchdog timer. Both regulators are synchronized to a single oscillator with an adjustable frequency (350kHz to 2.5MHz). At light loads, both regulators operate in low ripple Burst Mode? to maintain high effi ciency and low output ripple.The high voltage channel is a nonsynchronous buck with an internal 2.4A top switch that operates from an input of 4V to 42V and input transient protection to 55V. The low voltage channel operates from an input of 2.5V to 5.5V. Internal synchronous power switches provide high effi ciency without the need of external Schottky diode. Both channels have cycle-by-cycle current limit, providing protection against shorted outputs.The power-on reset and watchdog timeout periods are both adjustable using external capacitors. The window mode watchdog timer fl ags when the ?P pulses group too close together or too far apart.The LT3641 is available in a 28-pin 4mm ? 5mm QFN package and 28-pin TSSOP package. Both packages have an exposed pad for low thermal resistance.Applications Industrial Power Supplies Automotive Electronic Control Units

The LTC3226 is a 2-cell series supercapacitor charger with a backup PowerPath controller. It includes a charge pump supercapacitor charger with programmable output voltage, a low dropout regulator, and a power-fail comparator for switching between normal and backup modes.The constant input current supercapacitor charger is designed to charge two supercapacitors in series to a resistor-programmable output voltage from a 2.5V to 5.3V input supply. The charger input current limit is programmable by an external resistor at up to 315mA.The internal backup LDO is powered from the supercapacitors and provides up to 2A peak output current with an adjustable output voltage. When the input supply falls below the power-fail threshold, the LTC3226 automatically enters a backup state in which the supercapacitors power the output through the LDO. The input supply power-fail voltage level is programmed by an external resistor divider.Low input noise, low quiescent current and a compact footprint make the LTC3226 ideally suited for small, batterypowered applications. Internal current limit and thermal shutdown circuitry allow the device to survive a continuous short-circuit from the PROG or CPO pins to ground.Applications Smart Power Meters Battery-Powered Industrial/Medical Equipment 3.3V Solid-State Drives Industrial Alarms Data Backup Supplies Battery Hold-Up Supplies

Demonstration circuit 1739A-B is a 150W isolated forward converter with synchronous rectification featuring the LTC3765/LTC3766. This circuit demonstrates a high level of performance, efficiency, and small solution size attainable using these parts in an active-clamp-reset forward converter power supply. It operates at 240kHz and produces a regulated 12V, 12.5A output from an input voltage range of 18V to 72V, making it well suited for telecom, industrial, and other applications.

The LT1533 is a new class of switching regulator designed to reduce conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by providing user control of the output switch slew rates. Voltage and current slew rates can be independently programmed to optimize switcher harmonic content versus efficiency. The LT1533 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency. The LT1533 utilizes a dual output switch current mode architecture optimized for low noise topologies. The IC includes two 1A power switches along with all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics. Protection features include cycle by cycle current limit protection, undervoltage lockout and thermal shutdown. Low minimum supply voltage and low supply current during shutdown make the LT1533 well suited for portable applications. The part may also be forced into a 50% duty cycle mode for unregulated applications. The LT1533 is available in the 16-pin narrow SO package.Applications Precision Instrumentation Systems Isolated Supplies for Industrial Automation Medical Instruments Wireless Communications Single Board Data Acquisition Systems