Linear Technology Corp.
Milpitas, CA 95035
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Capacitor Charger uses current-limited flyback topology.
Stand-alone Model LT3468, intended for digital and film cameras, can charge 100 Ã-µF capacitor to 320 V in 4.6 sec from 3.6 V battery. With controlled peak current of 1.4 A, charger, in conjunction with flyback transformer, can charge any size photoflash capacitor with efficiencies greater than 80%. Model LT3468-1 is identical to LT3468, except that current limit is 0.7 A. Both utilize...
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Hot Swap Controller protects board during live insertion.
Model LTC4244 CompactPCI(TM) Hot Swap(TM) Controller turns board's supply voltages on and off in controlled manner, allowing board to be safely inserted or removed from live CompactPCI connnector without glitching system power supplies. IC controls 5 and 3.3 V supply voltages with external N-channel FETS, while internal switches control Ã-
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Active Mixer suits wireless and cable applications.
LT5522 active downconverting mixer has RF input with on-chip transformer that is 50 ohm matched over wide frequency range. RF input and Local Oscillator (LO) ports can be driven differentially or single-ended with minimum external impedance matching components. Mixer provides third-order intercept performance of 25 dBm @ 900 MHz and 21.5 dBm @ 1.9 GHz; draws 56 mA supply current at 5 V; and comes...
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Power Supply Controllers track up to 5 supplies.
Models LTC2921 and LTC2922 utilize N-channel MOSFETs to assure that multiple power supplies ramp up at same time and same rate, protecting ASICs, processors, and other circuitry from lock-up or more severe damage. Following successful ramp-up, remote sense switches allow regulators to close loop around MOSFETs and compensate for voltage drop. Adjustable electronic circuit breaker monitors primary...
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Step-Up DC/DC Converter has Schottky diode and soft start.
Housed in 6-lead ThinSOT(TM) package, LT3461/A combines 40 V, 300 mA (ISW), low VCESAT (260 mV) switch that delivers efficiencies to 84% with onboard Schottky diode and soft-start capability. Using constant frequency and current mode architecture, it operates from 2.5-16 V input voltage. Constant switching frequency of 1.3 or 3 MHz enables low noise operation and use of ceramic capacitors and...
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Step-Down Regulator features 0.08 ohm bypass MOSFET.
Model LTC3408 synchronous, 1.5 MHz buck regulator uses constant frequency, current mode architecture, which operates from input voltage range of 2.5-5 V. Integrated bypass MOSFET can deliver up to 600 mA of continuous output current from tiny 8-lead DFN package. Output can be dynamically programmed from 0.3-3.5 V. At output voltages above 3.6 V, internal bypass P-Channel MOSFET transistor...
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Power Detector offers adjustable offset and gain.
Model LTC5532 RF Power Detector monitors and controls applications in wireless communication transceivers. It has on-chip, temperature-compensated Schottky diode for RF detection and is factory trimmed to measure RF signals from 300 MHz to 7 GHz. RF input signal range is -32 to +8 dBm. Model LTC5532 employs peak-detection architecture, providing stable DC output voltage as function of RF input...
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MOSFET Driver tolerates 100 V transients.
Model LTC4440 N-channel 80 V MOSFET driver, housed in SOT-23 and 8-lead MSOP packages, offers peak pull-up output current of 2.4 A and 1.5 ohm pull-down output impedance. Unit reduces MOSFET gate drive fall and rise times to 7 ns and 10 ns, respectively, when driving 1,000 pF loads. Input logic signal is internally level-shifted to bootstrapped supply, which may function at up to 115 V above...
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Battery Charger operates independent of host IC.
Smart battery-charger controller, Model LTC4100, operates with or without host microcontroller. It charges 6.4-26 V multiple-cell, Li-Ion and Nickel-chemistry batteries at up to 4 A, with 0.8% voltage accuracy and 5% current accuracy, respectively. Synchronous switching operation provides constant-current/constant-voltage charging from input supply voltage of 6-28 V. Model LTC4100 meets...
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Controller tracks and sequences power supply.
Model LTC2923, in tiny 10-lead MSOP package, controls power-supply start up and shut down by introducing currents into feedback nodes. By properly selecting resistors, supply can be configured to ramp-up and ramp-down together, with options for fixed voltage offsets, time delays, or different ramp rates. Unit allows additional supply to be controlled with FET for systems that require tracking of...
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