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LTC1840


Part Number LTC1840
Manufacturer Linear
Title Dual Fan Controller
Description U U FEATURES s Two 8-Bit Current DACs s DACs Guaranteed Monotonic s Known IC State on Power-Up s Serial Interface Watchdog Timer with Disable s 2...
Features s Two 8-Bit Current DACs s DACs Guaranteed Monotonic s Known IC State on Power-Up s Serial Interface Watchdog Timer with Disable s 2-Wire Serial Interface Compatible with I2CTM and SMBus s 2 Programmable Fan Tachometer Interfaces s 4 Programmable General Purpose I/Os s Small 16-Pin SSOP Package s Si...

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LTC1841 : The LTC ®1841/LTC1842/LTC1843 are ultralow power dual comparators with built-in reference (LTC1842/LTC1843). The comparators feature less than 5.7µA supply current over temperature, a 1.182V ± 1% reference, programmable hysteresis and open-drain outputs that sink current. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation. The LTC1841 operates from a single 2V to 11V supply or a dual ± 1V to ± 5.5V supply. The LTC1842/LTC1843 operate from a single 2.5V to 11V supply or a dual ± 1.25V to ± 5.5V supply. The LTC1842/LTC1843 hysteresis is easily programmed by using two resistors and the HYST pin. The comparators’ input operates from the negative supply to withi.

LTC1842 : The LTC ®1841/LTC1842/LTC1843 are ultralow power dual comparators with built-in reference (LTC1842/LTC1843). The comparators feature less than 5.7µA supply current over temperature, a 1.182V ± 1% reference, programmable hysteresis and open-drain outputs that sink current. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation. The LTC1841 operates from a single 2V to 11V supply or a dual ± 1V to ± 5.5V supply. The LTC1842/LTC1843 operate from a single 2.5V to 11V supply or a dual ± 1.25V to ± 5.5V supply. The LTC1842/LTC1843 hysteresis is easily programmed by using two resistors and the HYST pin. The comparators’ input operates from the negative supply to withi.

LTC1843 : The LTC ®1841/LTC1842/LTC1843 are ultralow power dual comparators with built-in reference (LTC1842/LTC1843). The comparators feature less than 5.7µA supply current over temperature, a 1.182V ± 1% reference, programmable hysteresis and open-drain outputs that sink current. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation. The LTC1841 operates from a single 2V to 11V supply or a dual ± 1V to ± 5.5V supply. The LTC1842/LTC1843 operate from a single 2.5V to 11V supply or a dual ± 1.25V to ± 5.5V supply. The LTC1842/LTC1843 hysteresis is easily programmed by using two resistors and the HYST pin. The comparators’ input operates from the negative supply to withi.

LTC1844 : U U FEATURES ■ Very Low Dropout: 90mV at 150mA 30mV at 50mA (LTC1844-3.3) ■ Wide Input Voltage Range: 1.6V to 6.5V ■ Low 35µA Supply Current, Even in Dropout ■ Low Noise: 60µVRMS (10Hz to 100kHz) ■ ±1.75% Voltage Accuracy Over Temperature, Voltage and Current Ranges ■ Fast Transient Response ■ 10nA Supply Current in Shutdown ■ Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V ■ Adjustable Output Voltage: 1.25V to 6V ■ Output Current Limit ■ Reverse-Battery and Reverse-Current Protection ■ No Protection Diodes Needed ■ Stable with 1µF Output Capacitor ■ Stable with Ceramic Capacitors ■ Short-Circuit and Thermal Overload Protection ■ Low Profile (1mm) SOT-23 Package U APPLICATIO S ■ Portabl.




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