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General Description The MAX796 MAX797 MAX799 high performance step down DC DC converters with single or dual outputs provide main CPU power in battery powered systems These buck controllers achieve efficiency by using synchronous rectification and Maxim's proprietary Idle Mode™ control scheme to extend battery life at full load up to 10A and no load outputs Excellent dynamic response corrects output transients caused by the latest dynamic clock CPUs within five 300kHz clock cycles Unique bootstrap circuitry drives inexpensive N channel MOSFETs reducing system cost and eliminating the crowbar switching currents found in some PMOS NMOS switch designs The MAX796 MAX799 are specially equipped with a sec ondary feedback input SECFB for transformer based dual output applications This secondary feedback path improves cross regulation of positive MAX796 or nega tive MAX799 auxiliary outputs The MAX797 has a logic controlled and synchronizable fixed frequency pulse width modulating PWM operating mode which reduces noise and RF interference in sensi tive mobile communications and pen entry applications The SKIP override input allows automatic switchover to idle mode operation for high efficiency pulse skipping at light loads or forces fixed frequency mode for lowest noise at all loads The MAX796 MAX797 MAX799 are all available in pin DIP and narrow SO packages See the table below to compare these three converters
32 pages
English
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DESCRIPTION The UC1707 family of power drivers is made with a high speed Schottky process to interface between low level control functions and high power switching devices particularly power MOSFETs These devices contain two independent channels each of which can be activated by either a high or low input logic level signal Each output can source or sink up to 5A as long as power dissipation limits are not exceeded Although each output can be activated independently with its own inputs it can be forced low in common through the action either of a digital high sig nal at the Shutdown terminal or a differential low level analog signal The Shutdown command from either source can either be latching or not de pending on the status of the Latch Disable pin Supply voltage for both VIN and VC can independently range from 5V to 40V These devices are available in two watt plastic bat wing DIP for operation over a 0°C to 70°C temperature range and with reduced power in a her metically sealed cerdip for –55°C to +125°C operation Also available in surface mount DW Q L packages
8 pages
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General Description The MAX6668 MAX6670 remote junction thermal switches with an internal power transistor drive a cool ing fan rated for supply voltages up to +12V and 250mA These devices measure the temperature of an external P N junction typically a diode connected tran sistor and turn on the fan power switch when the remote temperature rises above a factory programmed threshold Self contained and requiring no software development the MAX6668 MAX6670 are simple “drop in” fan control solutions for a variety of systems The MAX6670 features an open drain WARN output that goes active when the remote temperature exceeds the factory programmed fan activation threshold by +15°C The MAX6670 features an open drain OT output that goes active when the remote temperature exceeds the factory programmed threshold by +30°C The MAX6668 MAX6670 provide a fan control input FORCEON that allows the fan to be driven externally regardless of temperature Available temperature thresholds range from +40°C to +75°C in 5°C increments Hysteresis is preset to 8°C on the MAX6668 or pin selectable to 4°C 8°C or 12°C using a three level logic input on the MAX6670 Temperature threshold accuracy is ±1°C typ and 2°C max for remote junction temperatures from +40°C to +75°C The MAX6668 MAX6670 operate from a +3V to 6V power supply and are specified over the automotive temperature range 40°C to +125°C The MAX6668 is offered in an pin MAX package and the MAX6670 is available in a space saving pin MAX package
8 pages
English
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