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A6250 데이터시트(PDF) 1 Page - EM Microelectronic - MARIN SA |
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A6250 데이터시트(HTML) 1 Page - EM Microelectronic - MARIN SA |
1 / 13 page High Efficiency Linear Power Supply with Accurate Power Surveillance and Software Monitoring Features n Highly accurate 5 V, 250 mA guaranteed output n Low dropout voltage, typically 260 mV at 250 mA n Low quiescent current, typically 175 µA n Standby mode, maximum current 340 µA (with 100 µA load on OUTPUT) n Unregulated DC input can withstand -20 V reverse battery and +60 V power transients n Fully operational for unregulated DC input voltage up to 40 V and regulated output voltage down to 3.0 V n Reset output guaranteed for regulated output voltage down to 1.2 V n No reverse output current n Very low temperature coefficient for the regulated output n Current limiting n Comparator for voltage monitoring, voltage reference 1.52 V n Programmable reset voltage monitoring n Programmable power on reset (POR) delay n Watchdog with programmable time windows guarantees a minimum time and a maximum time between software clearing of the watchdog n Time base accuracy ±10% n System enable output offers added security n TTL/CMOS compatible n -40 to +125°C temperature range n PSOP2-16 package Description The A6250 offers a high level of integration by combining voltage regulation, voltage monitoring and software moni- toring in a 16 lead package. The voltage regulator has a low dropout voltage (typ. 260 mV at 250 mA) and a low quiescent current (175 µA). The quiescent current in- creases only slightly in dropout prolonging battery life. Built-in protection includes a positive transient absorber for up to 60 V (load dump) and the ability to survive an un- regulated input voltage of -20 V (reverse battery). The in- put may be connected to ground or a reverse voltage without reverse current flow from the output to the input. A comparator monitors the voltage applied at the VIN input comparing it with an internal 1.52 V reference. The power-on reset function is initialized after VIN reaches 1.52 V and takes the reset output inactive after TPOR depending of external resistance. The reset output goes active low when the V IN voltage is less than 1.52 V. The RES and EN outputs are guaranteed to be in a correct state for a regu- lated output voltage as low as 1.2 V. The watchdog func- tion monitors software cycle time and execution. If software clears the watchdog too quickly (incorrect cycle time) or too slowly (incorrect execution) it will cause the system to be reset. The system enable output prevents critical control functions being activated until software has successfully cleared the watchdog three times. Such a se- curity could be used to prevent motor controls being ener- gized on repeated resets of a faulty system. Applications n Industrial electronics n Cellular telephones n Security systems n Battery powered products n High efficiency linear power supplies n Automotive electronics 1 A6250 EM MICROELECTRONIC-MARIN SA Typical Operating Configuration Pin Assignment Fig. 1 Fig. 2 A6250 A6250 |
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