Datasheet

8

Rev. 1.0

2023-07-11

OPTIREG™ linear TLE4263-2GS

5 V low drop voltage regulator

Functional description

4

Functional description

The control amplifier compares a reference voltage to a voltage that is proportional to the output voltage and

drives the base of the series transistor via a buffer. Saturation control as a function of the load current prevents

any oversaturation of the power element. The component also has a number of internal circuits for protection

against:

•Overload

• Overtemperature

• Reverse polarity

In case the externally scaled down output voltage at the reset adjust input falls below 1.35 V, the external reset

delay capacitor CD is discharged by the reset generator. When the voltage of the capacitor reaches the lower

threshold VDRL, a reset signal occurs at the reset output and is held until the upper threshold VDU is exceeded.

If the reset threshold input is connected to GND, reset is triggered at an output voltage of typically 4.65 V.

4.1

Choosing external components

The input capacitor CI is necessary for compensation of line influences. Using a resistor of approx. 1 Ω in series

with CI, the oscillating circuit consisting of input inductivity and input capacitance can be damped. The output

capacitor is necessary for the stability of the regulating circuit. Stability is ensured at values CQ ≥ 22 µF and an

ESR of ≤ 3 Ω within the operating temperature range. For small tolerances of the reset delay the spread of the

capacitance of the delay capacitor and its temperature coefficient should be noted.

4.2

Electrical characteristics

Table 5

Electrical characteristics

VI = 13.5 V; VINH > 3.6 V Tj = -40°C to +150°C ; (unless specified otherwise)

Parameter

Symbol

Values

Unit Note or Test Condition

Number

Min.

Typ.

Max.

Normal Operation

Output voltage

VQ

4.90

5.00

5.10

V

5 mA ≤ IQ ≤ 150 mA;

6 V ≤ VI ≤ 28 V

P_4.2.1

Output voltage

VQ

4.90

5.00

5.10

V

6 V ≤ VI ≤ 32 V;

IQ = 100 mA;

Tj = 100°C

P_4.2.2

Output current limitation IQ,max

180

250

400

mA

VQ = 4.8V

P_4.2.3

Current consumption;

Iq = II - IQ

Iq

–0

10

µA

VINH = 0 V; TJ ≤ 115°C

P_4.2.4

Current consumption;

Iq = II - IQ

Iq

–0.90

1.30

mA

IQ = 0 mA

P_4.2.5

Current consumption;

Iq = II - IQ

Iq

–10

18

mA

IQ = 150 mA

P_4.2.6

Current consumption;

Iq = II - IQ

Iq

–15

24

mA

IQ = 150 mA; VI = 4.5 V

P_4.2.7

Dropout voltage

Vdr

–0.35

0.50

V

IQ = 150 mA 1)

P_4.2.8

Load regulation

∆VQ,lo

––

25

mV

IQ = 5 mA to 150 mA

P_4.2.9