DC445A: Demo Board for the LT1944-1 Dual Micropower Step-Up DC/DC Converter.

DC455A: Demo Board for LTC3707 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

DC460A: Demo Board for LT3420 Photoflash Capacitor Chargers with Automatic Refresh.

The LTC1955 provides all necessary supervisory and power control functions for two smart cards, two S.A.M. cards or a combination of S.A.M. and smart cards. It provides a charge pump for battery-powered applications as well as all necessary level shifting circuitry.The card voltages can be independently set to 1.8V, 3V or 5V. Both card interfaces include a card detection channel with automatic debounce circuitry. To reduce wiring costs, the LTC1955 interfaces to a microcontroller via a simple 4-wire serial interface. Multiple devices may be connected in daisychain fashion so that the number of wires to the card socket board is independent of the number of sockets. Status data is returned over the same interface.Extensive security features ensure proper deactivation sequencing in the event of a supply fault or a smart card electrical fault. The smart card pins can withstand greater than 10kV ESD in-situ with no additional components.The LTC1955 is available in a low profile (0.75mm) 5mm ? 5mm QFN package.Applications Handheld Payment Terminals Pay Telephones ATM Machines POS Terminals Computer Keyboards Multiple S.A.M. Sockets

The LTC3405A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 20?A and drops to

DC483A: Demo Board for the LTC3720 Single Phase VRM8.5 Current Mode Step-Down Controller.

The LTC1923 is a pulse width modulator intended for thermoelectric cooler (TEC) or heater applications requiring either unidirectional or bidirectional drive circuits. All of the necessary control circuitry and two sets of complementary output drivers are integrated into the LTC1923 to drive a full bridge, providing an efficient means of bidirectional current flow to the TEC. An accurate temperature control loop to stabilize the temperature of a laser diode system is easily achieved with the addition of just a few external components. Typical temperature setpoint accuracy of 0.1?C is achievable with the LTC1923. Adding an instrumentation amplifier front end allows setpoint stability of 0.01?C.The part features independent adjustable heating and cooling pulse-by-pulse current limit, current soft-start for controlled start-up, output slew rate control to reduce system noise, differential current sense and voltage amplifiers and a host of auxiliary circuits to protect the laser and provide redundant system monitoring.Applications Laser-Based Fiber Optic Links Medical Instruments CPU Temperature Regulators

The LTC4007 is a complete constant-current/constant-voltage charger controller for 3- or 4-cell lithium-ion batteries. The PWM controller uses a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when using ceramic capacitors. Charging current is programmable to ?4% accuracy using a programming resistor. Charging current can also be monitored as a voltage across the programming resistor.The output float voltage is pin programmed for cell count (3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer, programmed by an external resistor, sets the charge termination time. Charging is automatically restarted when cell voltage falls below 3.9V/cell.LTC4007 includes a thermistor input, which suspends charging if an unsafe temperature condition is detected. If the cell voltage is less than 2.5V, a low-battery indicator asserts and can be used to program a trickle charge current to safely charge depleted batteries. The FAULT pin is also asserted and charging terminates if the low-battery condition persists for more than 1/4 of the total charge time. LTC4007 LTC4007-1 Low battery threshold 4.2V cell 2.5V 3.25V Low battery threshold 4.1V cell 2.44V 3.173V Restart Enabled Disabled Package SSOP-24 QFN-24 Applications Notebook Computers Portable Instruments Battery-Backup Systems Standalone Li-Ion Chargers

The LT1373 is a low supply current high frequency current mode switching regulator. It can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and ?Cuk.? A 1.5A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry. All functions of the LT1373 are integrated into 8-pin SO/PDIP packages.Compared to the 500kHz LT1372, which draws 4mA of quiescent current, the LT1373 switches at 250kHz, typically consumes only 1mA and has higher efficiency. High frequency switching allows for small inductors to be used. All surface mount components consume less than 0.6 square inch of board space.New design techniques increase flexibility and maintain ease of use. Switching is easily synchronized to an external logic level source. A logic low on the shutdown pin reduces supply current to 12?A. Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency compensation techniques. Nonlinear error amplifier transconductance reduces output overshoot on start-up or overload recovery. Oscillator frequency shifting protects external components during overload conditions.Applications Boost Regulators CCFL Backlight Driver Laptop Computer Supplies Multiple Output Flyback Supplies Inverting Supplies

Demonstration circuit 518 is a SLIC (Subscriber Line Interface Circuit) positive input to negative output converter featuring the LTC3704 switching controller. DC518 converts 4.5V to 15V input to –24V at 200mA and –70V at 200mA at its output. The demo board uses a transformer with the three primary side widings in parallel to generate three –24V outputs. By stacking the voltages on top of each other, –70V ±10% is obtained. The demo board operates at 200kHz with high efficiency of up to 92%.

Demonstration circuit 524 is a positive input to negative output converter featuring the LTC3704 switching controller. The DC524 converts a 5V to 15V input to a –5.2V output and provides up to 2.5A of output current from 5V input. The converter operates at 300kHz with a high efficiency of 89%. The DC524 is set to operate in No RSENSE™ mode with input voltages up to 15V. However, DC524 can be modified for higher input voltages with an optional current sense resistor. The circuit features optional soft-start circuitry that can be enabled or disabled with a single jumper. Also, DC524 has a jumper to program either continuous or Burst Mode™ operation. The DC524 can be synchronized to an external clock of up to 400kHz.

The LT1310 boost DC/DC converter combines a 1.5A current mode PWM switcher with an integrated phase-locked loop, allowing the user to set the switching frequency anywhere from 10kHz to 4.5MHz. Intended for use in applications where switching frequency must be accurately controlled, the LT1310 can generate 12V at up to 400mA from a 5V input.Switching frequency is set with an external capacitor, and the device can be operated in either free-running or phase-locked mode. A wide capture range of nearly 2:1 allows the free-running frequency to be set using standard ?10% tolerance NP0 dielectric capacitors.The LT1310 is available in the tiny thermally enhanced 10-lead MSOP package.Applications Instruments Avionics Data Acquisition Communications Imaging Ultrasound

DC528A: Demo Board for the LTC1740 14-Bit, 6Msps, Sampling ADC.

DC529A-B: Demo Board for the LTC3735 2-Phase, High Efficiency DC/DC Controller for Intel Mobile CPUs.

DC540A-B: Demo Board for the LTC1608 High Speed, 16-Bit, 500ksps Sampling A/D Converter with Shutdown.

Demonstration circuit 558 is a high current step-down PolyPhaseTM converter featuring the LTC3731 three phase synchronous buck controller. The demo circuit input voltage is from 5V to 14V and output is 1.5V/60A.

The LTC3403 is a high efficiency monolithic synchronous buck regulator optimized for WCDMA power amplifier applications. The output voltage can be dynamically programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor. Selectable forced continuous mode enables fast VOUT response to the controlling input.Supply current is only 20?A in Burst Mode? operation and drops to

Demonstration circuit 561 is a high current stepdown PolyPhaseTM converter featuring the LTC3731 three-phase synchronous buck controller. The input voltage is from 10V to 14V and output is 1.5V. DC561A-A can provide up to 180A output current with a 12-phase buck circuit, while DC561A-B is a 6-phase buck converter with up to 90A output current. An optional VID controller circuit is available on both DC561A-A and DC561A-B demo circuits for output voltage programming.

Demonstration circuit 568 is a Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Regulator featuring the LTC3407 in the MSOP-10 exposed pad package. The DC568 has an input voltage range of 2.5V to 5.5V, and either output is capable of delivering up to 600mA of output current. In Burst Mode® operation, the LTC3407 requires only 40uA of quiescent current; in Pulse Skip mode, the LTC3407 provides lower output ripple voltage at light load currents. The DC568 can provide up to 96% efficiency on either channel and consumes less than 1uA in shutdown.

The LTC4054 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the LTC4054 ideally suited for portable applications. Furthermore, the LTC4054 is specifically designed to work within USB power specifications.No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LTC4054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.When the input supply (wall adapter or USB supply) is removed, the LTC4054 automatically enters a low current state, dropping the battery drain current to less than 2?A. The LTC4054 can be put into shutdown mode, reducing the supply current to 25?A.Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. Max Charge Current Trickle Charge LTC4054-4.2 800mA Yes LTC4054X-4.2 800mA No LTC4054L-4.2 150mA Yes Applications Cellular Telephones, PDAs, MP3 Players Charging Docks and Cradles Bluetooth Applications