LTC1041

U U FEATURES s Micropower 1.5µW (1 Sample/Second) s Wide Supply Range 2.8V to 16V s High Accuracy Guaranteed SET POINT Error ±0.5mV Max Guaranteed Deadband ±0.1% of Value Max s Wide Input Voltage Range V+ to Ground s TTL Outputs with 5V Supply s Two Independent Ground-Referred Control Inputs s Small Size 8-Pin SO U APPLICATIO S s Temperature Control (Thermostats) s Motor Speed Control s Battery Charger s Any ON-OFF Control Loop , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation. LTC1041 BANG-BANG Controller DESCRIPTIO The LTC®1041 is a monolithic CMOS BANG-BANG controller manufactured using Linear Technology’s enhanced LTCMOS™ silicon gate process. BANG-BANG loops are characterized by turning the control element fully ON or fully OFF to regulate the average value of the parameter to be controlled. The SET POINT input determines the average control value and the DELTA input sets the deadband. The deadband is always 2 x DELTA and is centered around the SET POINT. Independent control of the SET POINT and deadband, with no interaction, is made possible by the unique sampling input structure of the LTC1041. An external RC connected to the OSC pin sets the sampling rate. At the start of each sample, internal power to the analog section is switched on for ≈ 80µs. During this time, the analog inputs are sampled and compared. After the comparison is complete, power is switched off. This achieves extremely l...