TLE4253GS datasheet(7/22 Pages) INFINEON

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Data Sheet

Rev. 1.2, 2009-11-09

TLE4253

Electrical Characteristics

5.1

Tracking Regulator

The output voltage

Q is controlled by comparing it to the voltage applied at pin ADJ/EN and driving a PNP pass

transistor accordingly. The control loop stability depends on the output capacitor

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”

have to be maintained. For details see also the typical performance graph “Output Capacitor Series Resistor

ESR

CQ vs. Output Current IQ”. Also, the output capacitor shall be sized to buffer load transients.

An input capacitor

I is strongly recommended to buffer line influences. Connect the capacitors close to the IC

terminals.

Protection circuitry prevent the IC as well as the application from destruction in case of catastrophic events. These

safeguards contain output current limitation, reverse polarity protection as well as thermal shutdown in case of

overtemperature.

In order to avoid excessive power dissipation that could never be handled by the pass element and the package,

the maximum output current is decreased at high input voltages.

An overtemperature protection circuit prevents the IC from immediate destruction under fault conditions (e. g.

output continuously short-circuited to GND) by reducing the output current. A thermal balance below 200 °C

junction temperature is established. Please note that a junction temperature above 150 °C is outside the maximum

ratings and reduces the IC lifetime.

The TLE4253 allows a negative supply voltage. However, several small currents are flowing into the IC. For details

see electrical characteristics table and typical performance graph. The thermal protection circuit is not operating

during reverse polarity condition.

Table 1

Electrical Characteristics Tracking Regulator

I = 13.5 V; VADJ/EN ≥ 2.0 V; VFB = VQ; -40 °C ≤ Tj ≤ 150 °C;

all voltages with respect to ground (unless otherwise specified).

Pos.

Parameter

Symbol

Limit Values

Unit

Test Condition

Min.

Typ.

Max.

5.1.1

Output Voltage Tracking

Accuracy

∆VQ = VEN/ADJ - VQ

∆VQ

-5

–

Q = 30 mA;

ADJ/EN = 5 V

5.1.2

-10

–

0.1 mA

≤ IQ ≤ 200 mA;

3.5 V

≤ VI ≤ 32 V

ADJ/EN = 2 V

5.1.3

-15

–

0.1 mA

≤ IQ ≤ 250 mA;

9 V

≤ VI ≤ 32 V

ADJ/EN = 5 V

5.1.4

Load Regulation

steady-state

Q,load|–

–

Q = 0.1 mA to 200 mA;

ADJ/EN = 5 V

5.1.5

Line Regulation

steady-state

Q,line|–

–

I = 6 V to 32 V;

Q = 10 mA

ADJ/EN = 5 V

5.1.6

Power Supply Ripple

Rejection

PSRR

–

ripple = 100 Hz;

ripple = 1 Vpp

Q = 10 µF, ceramic type

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