V oltage Regulator
Key Features
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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 Ω 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.
V bat monitor with fault signal generation when Vbat is out of operative range V dd monitor with intelligent reset generation based on Vdd level I nternal protections against transients up to 40V O ver-temperature monitor P ower 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
C opyright © 2 003 austriamicros ystems. Trademarks registered ®. 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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