TLE4254 데이터 시트보기 (PDF) - Infineon Technologies

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TLE4254

High Accuracy Low Dropout Voltage Tracking Regulator

Infineon Technologies 

TLE4254

Electrical Characteristics

5

Electrical Characteristics

5.1

Tracking Regulator

The output voltage VQ 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 CQ, the load current, the chip

temperature and the poles/zeros introduced by the integrated circuit and the load. 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 ESRCQ vs. Output Current IQ”. Also, the output capacitor shall be sized to buffer load transients.

An input capacitor CI 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.

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

output continuously short-circuited) 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 TLE4254 allows a negative supply voltage. However, several 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 condition.

Table 1 Electrical Characteristics Tracking Regulator

VI = 13.5 V; VADJ/EN ≥ 2.0 V; VFB = VQ (version GA / EJ A); -40 °C ≤ Tj ≤ 150 °C; CQ = 1 µF;

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 ∆VQ

Accuracy

∆VQ = VEN/ADJ - VQ

5.1.2

-5 –

-10 –

5.1.3

-10 –

5.1.4

5.1.5

Load Regulation

steady-state

Line Regulation

steady-state

|dVQ,load| –

1

|dVQ,line| –

1

5

mV 8 V ≤ VI ≤ 18 V;

0.1 mA ≤ IQ ≤ 60 mA;

VADJ/EN = 5 V

10

mV 5.5 V ≤ VI ≤ 26 V;

0.1 mA ≤ IQ ≤ 60 mA;

VADJ/EN = 5 V

10

mV 5.5 V ≤ VI ≤ 32 V;

0.1 mA ≤ IQ ≤ 30 mA;

VADJ/EN = 5 V

10

mV IQ = 0.1 mA to 70 mA;

VADJ/EN = 5 V

10

mV VI = 5.5 V to 32 V;

IQ = 5 mA

VADJ/EN = 5 V

Data Sheet

8

Rev. 1.2, 2009-11-18

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