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| Voltage Regulator Key Features - General Description This block provides a stable regulated output voltage starting from a battery input with the maximum current load allowed by the thermal package limitation (worst case 20mA). Higher current can be delivered using an external NPN transistor. External capacitors are required on the regulated line (VDD) and the battery supply voltage (VBAT). Battery input is monitored and a fault signal becomes active when VBAT is out of its operative range (an hysteresis is provided). VDD also is monitored and a fault signal becomes active when VDD is below a defined voltage threshold (an hysteresis is provided). Internal protections are designed to handle transients up to 40V. An external 45V zener diode between VBAT and ground with a 500 resistor in series with the battery supply and the VBAT pin is required to protect the device from power transients. An external blocking diode is required to provide reverse battery protection. Over-temperature monitor turns off the circuit when the die temperature exceeds the fixed threshold. The circuit has a power-down mode to permit very low standby currents. Vbat monitor with fault signal generation when Vbat is out of operative range Vdd monitor with intelligent reset generation based on Vdd level Internal protections against transients up to 40V Over-temperature monitor Power down mode Typical Application Diagrams CONFIGURATION FOR LOAD CURRENT < 20 mA CONFIGURATION FOR LOAD CURRENT > 20 mA VBAT_FAULT VDD_FAULT BATTERY TEMP_FAULT PD GND VBAT VBAT_FAULT VDD_FAULT VBAT VOLTAGE REGULATOR BC BATTERY TEMP_FAULT PD VOLTAGE REGULATOR BC VDD VDD GND Key Parameters Battery Supply Voltage Output Voltage Symbol VBAT VDD Min. 7V 4.75V Max. 18V 5.25V Notes Load dump 42V. Recommended external capacitor 100nF. 20mA max. load, higher current with external transistor. Hysteresis >10 degrees Temperature Threshold Ambient Temperature For detailed information: info@austriamicrosystems.com http://www.austriamicrosystems.com/ Toff Tamb 160 C -40 C 85 C Copyright (c) 2003 austriamicros ystems. Trademarks registered (R). All rights reser ved. The material her ein m ay not be reproduced, adapted, merged, trans lated, stored, or used without the prior written consent of the copyright owner. To the best of its knowledge, austriamicros ystems asserts that the information contained in this publication is accurate and correct. Revis ion 1. 0, 08/27/03 |
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