R
EM MICROELECTRONIC -
MARIN SA
EM6156
5V 120mA Automotive LDO Regulator with Watchdog
Description
The EM6156 offers a high level of integration by combining
voltage regulation, voltage monitoring and software
monitoring using a watchdog.
A comparator monitors the voltage applied at the VIN input
comparing it with an internal voltage reference VREF. The
power-on reset function is initialized after VIN reaches
VREF and takes the reset output inactive after a delay
TPOR. The reset output goes active low when the VIN
voltage is less than VREF. The RESET output is guaranteed
to be in a correct state for a regulated output voltage as low
as 1.2V. The watchdog function monitors software cycle
time and execution. If software clears the watchdog too
slowly (incorrect execution) it will cause the system to be
reset.
In EM6156, the voltage regulator has a low dropout voltage
and a low quiescent current. The quiescent current
increases only slightly in dropout prolonging battery life.
Built-in protection includes a positive transient absorber for
up to 45 V (load dump) and the ability to survive an
unregulated input voltage of -42 V (reverse battery). The
input may be connected to ground or to a reverse voltage
without reverse current flowing from the output to the input.
Features
-40°C to +125°C temperature range
Highly accurate 5 V, 120 mA guaranteed output (actual
maximum current depends on power dissipation)
Output voltage tolerance <+/- 3%
Low dropout voltage, typically 250 mV at 100 mA
Unregulated DC input can withstand -42 V reverse
battery and +45 V power transients
Fully operational for unregulated DC input voltage up to
40 V and regulated output voltage down to 3.5 V
No reverse output current
Very low temperature coefficient for the regulated
output
Current limiting
Four threshold voltages (2.9V, 3.0V, 4.4V, 4.6V)
Several timeout reset periods (1.6ms, 25ms,
200ms,
1600ms)
Several watchdog timeout periods (6.2ms, 102ms,
1,6s,
25,6s)
Push pull or Open-drain active-low RESET output
Reset output guaranteed for regulated output voltage
down to 1.2 V
Qualified according to AEC-Q100
Green SO8 Exposed Pad Power Package (RoHS
compliant)
Typical Operating Configuration
Applications
Automotive systems
Industrial
Home security systems
Fig. 1
Copyright
©
2007, EM Microelectronic-Marin SA
06/07 – rev.A
1
www.emmicroelectronic.com
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
