Voltage 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鈩?/div>
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
鈮?00nF.
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擄 C
-40擄 C
85擄 C
Copyright
漏 2003 austriamicros ystems. Trademarks registered 廬. 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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