AT73C204 Datasheet, PDF (10/18 Pages) ATMEL Corporation – Power Management for Mobiles (PM)

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
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.
Temperature Sensor
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.
Three-channel Level
Shifters
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
*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.
Recommended Operating Conditions
Table 3. Recommended Operating Conditions
Parameter
Conditions
Operating Temperature
Power Supply Input
V_INA, V_INB,..., V_INF
Min
Maw
Unit
-20
85
°C
3.0
4.5
V
10 _AT73C204
6014A–PMGMT–10/03