Data Sheet

10

Rev. 1.10 2016-04-20

TLS805B1LDV50

Block Description and Electrical Characteristics

5

Block Description and Electrical Characteristics

5.1

Voltage Regulation

voltage reference and the pass transistor is driven accordingly.

internal circuit structure. To ensure stable operation, the output capacitor’s capacitance and its equivalent

series resistor ESR requirements given in “Functional Range” on Page 8 have to be maintained. For details

see the typical performance graph Output Capacitor Series Resistor ESR(CQ) versus Output Current IQ.

Since the output capacitor is used to buffer load steps, it should be sized according to the application’s needs.

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.

In order to prevent overshoots during start-up, a smooth ramping up function is implemented. This ensures

almost no overshoots during start-up, mostly independent from load and output capacitance.

Whenever the load current exceeds the specified limit, e.g. 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

(e.g. output continuously short-circuit) by switching off the power stage. After the chip has cooled down, 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.

Figure 4

Block Diagram Voltage Regulation

Bandgap

Reference

GND

Q

I

Temperature

Shutdown

Current

Limitation

Regulated

Output Voltage

Supply

V

I

LOAD

C

ESR

I

I