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TLE42994GM Datasheet(PDF) 14 Page - Infineon Technologies AG

Part # TLE42994GM
Description  Extreme Low Current Consumption In ON State
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE42994GM Datasheet(HTML) 14 Page - Infineon Technologies AG

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Data Sheet
14
Rev. 1.2, 2014-07-03
TLE42994
Block Description and Electrical Characteristics
5
Block Description and Electrical Characteristics
5.1
Voltage Regulator
The output voltage
V
Q is controlled by comparing a portion of it to an internal reference and driving a PNP pass
transistor accordingly. The control loop stability depends on the output capacitor
C
Q, the load current, the chip
temperature and the poles/zeros introduced by the integrated circuit. To ensure stable operation, the output
capacitor’s capacitance and its equivalent series resistor ESR requirements given in the table “Functional
Range” on Page 12 have to be maintained. For details see also the typical performance graph “Output
Capacitor Series Resistor ESR(CQ) versus Output Current IQ” on Page 17. As the output capacitor also has
to buffer load steps it should be sized according to the application’s needs.
An input capacitor
C
I is strongly recommended to compensate line influences. Connect the capacitors close to the
component’s terminals.
A protection circuitry prevents the IC as well as the application from destruction in case of catastrophic events.
These safeguards contain an output current limitation, a reverse polarity protection as well as a thermal shutdown
in case of overtemperature.
To avoid excessive power dissipation that could never be handled by the pass element and the package, the
maximum output current is decreased at input voltages above
V
I =22V.
The overtemperature shutdown circuit prevents the IC from immediate destruction under fault conditions (e.g.
output continuously short-circuited) by switching off the power stage. After the chip has cooled down, the regulator
restarts. This leads to an oscillatory behaviour of the output voltage until the fault is removed. However, junction
temperatures above 150 °C are outside the maximum ratings and therefore significantly reduce the IC’s lifetime.
The TLE42994 allows a negative supply voltage. In this fault condition, small currents are flowing into the IC,
increasing its junction temperature. This has to be considered for the thermal design, respecting that the thermal
protection circuit is not operating during reverse polarity conditions.
Figure 6
Voltage Regulator
Bandgap
Reference
GND
Q
I
BlockDiagram_VoltageRegulator.vsd
Saturation Control
Current Limitation
Temperature
Shutdown
CQ
ESR
C
}
LOAD
Supply
C
I
Regulated
Output Voltage
I
Q
I
I


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