Datasheet TLS715B0NAV50 (Infineon) - 9

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OPTIREG™ Linear TLS715B0NAV50 Low dropout linear voltage regulator Block description and electrical characteristics 4 Block description and electrical characteristics 4.1 Voltage regulation
The output voltage VQ is divided by a resistor network. This fractional voltage is compared to an internal voltage reference and drives the pass transistor accordingly. The control loop stability depends on the output capacitor CQ, the load current, the chip temperature and the internal circuit design. To ensure stable operation, the output capacitor’s capacitance and its equivalent series resistor ESR requirements given in
Table 2 “Functional range” on Page 7
must be maintained. For details see the typical performance graph
“Output capacitor series resistor ESR(CQ) versus output current IQ” on Page 12
. Since the output capacitor is used to buffer load steps, it should be sized according to the application’s needs. An input capacitor CI is not required for stability, but is recommended to compensate line fluctuations. An additional reverse polarity protection diode and a combination of several capacitors for filtering should be used, in case the input is connected directly to the battery line. Connect the capacitors close to the regulator terminals. Whenever the load current exceeds the specified limit, for example in case of a short circuit, the output current is limited and the output voltage decreases. The overtemperature shutdown circuit prevents the IC from immediate destruction under fault conditions (for example output continuously short-circuited) by switching off the power stage. After the chip has cooled, the regulator restarts. This oscillatory thermal behaviour causes the junction temperature to exceed the maximum rating of 150°C and can significantly reduce the IC’s lifetime. Regulated Supply II I Output Voltage Q
I Q
Current Limitation
EN
Enable C LOAD CI Bandgap VI VQ Reference Temperature ESR Shutdown CQ
GND Figure 3 Block diagram voltage regulation
Datasheet 9 Rev. 1.1 2019-07-31 Document Outline Features Potential applications Product validation Description Table of contents 1 Block diagram 2 Pin configuration 2.1 Pin assignment PG-TSNP-7 2.2 Pin definitions and functions PG-TSNP-7 3 General product characteristics 3.1 Absolute maximum ratings 3.2 Functional range 3.3 Thermal resistance 4 Block description and electrical characteristics 4.1 Voltage regulation 4.2 Typical performance characteristics voltage regulator 4.3 Current consumption 4.4 Typical performance characteristics current consumption 4.5 Enable 4.6 Typical performance characteristics enable 5 Application information 5.1 Application diagram 5.2 Selection of external components 5.2.1 Input pin 5.2.2 Output pin 5.3 Thermal considerations 5.4 Reverse polarity protection 5.5 Further application information 6 Package information 7 Revision history