LINEAR Manuals

The LTC ®3780 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phase-lockable frequency of up to 400kHz. With a wide 4V to 30V input voltage range and up to 98% efficiency, the LTC3780 is ideal for battery-powered and other high voltage applications.

The LT3430 is a 200kHz monolithic buck switching regulator that accepts input voltages up to 60V. It features a high efficiency 3A, 0.1Ω switch, a current mode architecture, and special design techniques that achieve high efficiency over a wide input range.

The LTC3425 is a synchronous, 4-phase boost converter with output disconnect capable of operation below 1V input. It includes four N-channel MOSFET switches and four P-channel synchronous rectifiers for an effective RDS(ON) of 0.045Ω and 0.05Ω, respectively. 4-phase operation greatly reduces peak inductor currents, and capacitor ripple current, and increases effective switching frequency, minimizing inductor and capacitor sizes. True output disconnect eliminates inrush current and allows zero load current in shutdown.

This datasheet introduces LT3431, a high voltage, 3A, 500kHz step-down switching regulator. It features a wide input range (5.5V to 60V), 3A peak switch current, small thermally enhanced 16-pin TSSOP package, constant 500kHz switching frequency, saturated switch design (0.1Ω), peak switch current maintained over full duty cycle range, effective supply current 2.5mA, shutdown current 30µA, 1.2V feedback reference voltage, easily synchronized, cycle-by-cycle current limiting and more.

The LT3420 and LT3420-1 are high efficiency photoflash capacitor chargers that charge a 220µF capacitor to 320V in 3.7 seconds or a 100µF capacitor to 320V in 3.5 seconds. This family uses standard transformers and features automatic refresh.

The document introduces the features and characteristics of LT3420/LT3420-1 chargers. The charger can charge 220μF to 320V flash capacitors and the charging time is 3.7 seconds.

The LT3420/LT3420-1 are high voltage photoflash capacitor chargers with automatic refresh. They are designed for use in both digital and film cameras and use a flyback topology to achieve efficiencies up to four times better than competing flash modules. A unique adaptive off-time control algorithm maintains current-limited continuous mode transformer operation throughout the entire charge cycle, eliminating the high inrush current often found in modules. The LT3420/LT3420-1 output voltage sensing scheme indirectly regulates the output voltage by monitoring the flyback voltage, eliminating the need for an output resistor divider or discrete zener diode. This feature allows the capacitor to be quickly charged to 320V from a 5V input voltage, making it suitable for any size photoflash capacitor.

The LTC3548 is a dual, constant frequency, synchronous step down DC/DC converter from Linear Technology. It operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency. Each output voltage is adjustable from 0.6V to 5V. It supports 400mA and 800mA output currents. It features high efficiency, low quiescent current, high switching frequency, low on-resistance, and short-circuit protection. It is suitable for low power applications such as PDAs/Palmtop PCs, digital cameras, cellular phones, portable media players, PC cards, wireless and DSL modems.

The LT119A/LT319A LM119/LM319 is a low input offset voltage, input protection diodes, single 5V supply, 25mA drive capability, 80ns response time dual comparator.