Demonstration circuit 903 is a step-up/step-down charge pump dc-dc converter. It comes with two assembly versions, DC903A-A and DC903A-B featuring the 150mA output current LTC3240-3.3 (3.3V output) and LTC3240-2.5 (2.5V output) respectively, each in a tiny 2mm x 2mm DFN package. The DC903A-A and DC903A-B operate with an input voltage from 1.8V to 5.5V. When using the DC903A-A, the output current can reach up to 150mA when the input voltage is above 2.5V. The maximum output current of the DC903A-B is 60mA with a 1.8V input voltage. The DC903A optimizes the output efficiency by operating in the LDO step-down mode during the time the input is higher than the output voltage. When the input voltage drops low enough, The LTC3240 automatically switches to charge-pump doubling mode to extend system run-time. Built-in soft-start limits inrush current at turn-on, and short-circuit current limit/thermal protection help the part survive a continuous short-circuit. Additionally, the DC903A features Automatic Burst Mode operation at light load to achieve low supply current (65µA, no load).

The LT3491 is a fixed frequency step-up DC/DC converter specifically designed to drive up to six white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a ?one wire current source;? one side of the LED string can be returned to ground anywhere, allowing a simpler one wire LED connection. Traditional LED drivers use a grounded resistor to sense LED current, requiring a 2-wire connection to the LED string.The 2.3MHz switching frequency allows the use of tiny inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. Few external components are needed: open-LED protection and the Schottky diode are all contained inside the tiny SC70 package. With such a high level of integration, the LT3491 provides a high efficiency LED driver solution in the smallest of spaces.Applications Cellular Phones PDAs, Handheld Computers Digital Cameras MP3 Players GPS Receivers

Demonstration circuit DC915 features the LT3466-1 high efficiency boost white LED driver and a step-up converter. There is one LED driver output for 6 or 8 WLEDs and a separate DC/DC converter that generates outputs for the LCD bias. VO1 drives 8 LEDs in series with 15mA LED current and VO2/VO3 can delivery ±15V at 10mA current. If the charge-pump circuitry which generates VO3 is removed (C4, C5 and D1), VO2 can deliver over 35mA of current. The input voltage range is 3V to 14V, but can go as low as 2.7V with slightly reduced output current.

DC918C-I: Demo Board for LTC2207-14 14-Bit, 105Msps ADC.

DC918C-J: Demo Board for the LTC2206-14 14-Bit, 80Msps ADC.

DC928A: Demo Board for the LTC3452 Synchronous Buck-Boost MAIN/CAMERA White LED Driver.

The LTC2484 combines a 24-bit No Latency ??? analog-to-digital converter with patented Easy Drive? technology. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and input signals with rail-to-rail input range to be directly digitized while maintaining exceptional DC accuracy.The LTC2484 includes an on-chip oscillator. The LTC2484 can be configured to reject line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz line frequency rejection can be selected as well as a 2? speed-up mode.The LTC2484 allows a wide common mode input range (0V to VCC) independent of the reference voltage. The reference can be as low as 100mV or can be tied directly to VCC. The LTC2484 includes an on-chip trimmed oscillator, eliminating the need for external crystals or oscillators. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset and full-scale calibration.Applications Direct Sensor Digitizer Weight Scales Direct Temperature Measurement Strain Gauge Transducers Instrumentation Industrial Process Control DVMs and Meters

DC947A: Demo Board for the LT3740 Wide Operating Range, Valley Mode, No RSENSE Synchronous Step-Down Controller.

The LT3478/LT3478-1 are 4.5A step-up DC/DC converters designed to drive LEDs with a constant current over a wide programmable range. Series connection of the LEDs provides identical LED currents for uniform brightness without the need for ballast resistors and expensive factory calibration.The LT3478-1 reduces external component count and cost by integrating the LED current sense resistor. The LT3478 uses an external sense resistor to extend the maximum programmable LED current beyond 1A and also to achieve greater accuracy when programming low LED currents. Operating frequency can be set with an external resistor from 200kHz up to 2.25MHz. Unique circuitry allows a PWM dimming range up to 3000:1 while maintaining constant LED color. The LT3478/LT3478-1 are ideal for high power LED driver applications such as automotive TFT LCD backlights, courtesy lighting and heads-up displays. One of two CTRL pins can be used to program maximum LED current. The other CTRL pin can be used to program a reduction in maximum LED current vs temperature to maximize LED usage and improve reliability.Additional features include inrush current protection, programmable open LED protection and programmable soft-start. Each part is available in a 16-pin thermally enhanced TSSOP Package.Applications High Power LED Driver Automotive Lighting

Demonstration circuit 952 is a current mode synchronous switching regulator featuring the LTC3810. The circuit is configured as a synchronous step-down regulator operating at 230kHz switching frequency. Output voltage is 12V at 6A maximum load. The input voltage range is 13V to 80V.