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In Figure 9, the left-hand output transistor is sized large enough for the required output
current under full load, for example, 100 mA. In order to achieve a sufficient margin of
stability, the current sensing block uses a bias cell where the current consumption is
linked to the required output current. The higher the output current, the higher the bias
current needed to stabilize the loop.
The right-hand output transistor delivers a very small output current, typically less than 1
mA, sufficient only to maintain the output voltage with enough current to cover the leak-
age current of the supplied device. This requires a much smaller bias current and,
consequently, a smaller standby current inside the regulator.
LDO7
Temperature Sensor
Three-channel Level
Shifters
This regulator has extremely low quiescent current and is suited where power supply is
enabled almost all the time. Typical use could be the supply of back-up battery.
The temperature sensor voltage output is a linear function of temperature.
The temperature seen by the sensor is directly related to the chip activity and the power
internally dissipated. To get a good indication of the ambient temperature, the software
must take into account this offset.
This block provides a DC-to-DC or Memory Card level shifter and specific ESD protec-
tions. Signals are level-shifted on the LDO2 supply, allowing dual-voltage option: 1.8V
or 2.8V. If the memory type is Subscriber Identity Module (SIM) Card, level shifters are
compliant with ETSI GSM11.12 & 11.18.
Absolute Maximum Ratings
Operating Temperature (Industrial)............... -40 ° C to +85 ° C
Storage Temperature ................................. -55°C to + 150°C
Power Supply Input
V INA , V INB ,...,V INF ............................................ -0.3V to +6.5V
I/O Input (all except to power supply........ -0.3V to V MAX +0.3
Recommended Operating Conditions
Table 3. Recommended Operating Conditions
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or other
conditions beyond those indicated in the opera-
tional sections of this specification is not implied.
Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
Parameter
Operating Temperature
Power Supply Input
Conditions
V INA , V INB ,..., V INF
Min
-20
3.0
Maw
85
4.5
Unit
°C
V
10
AT73C204
6014A–PMGMT–10/03
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