TLE4266-2_08 Datasheet, PDF (7/12 Pages) Infineon Technologies AG – Low Drop Voltage Regulator Fixed output voltage 5.0 V or 3.3 V

TLE 4266-2
Input
5.5 V to 45 V
Ι_i
470 µF
V_i
V_INH
100 nF
Ι _INH
Ι
Q
TLE 4266-2
INH
GND
Output
Ι_Q
10 µF
V_Q
AES02875
Figure 3 Measuring Circuit
Circuit Description and Application Information
In the TLE 4266-2 the output voltage is divided and compared to an internal reference of
2.5 V typical. The regulation loop controls the output to achieve an output voltage of 5 V
with an accuracy of ±2% at an input voltage up to 45 V. The minimum required input
voltage is V_Q + V_dr with a drop voltage V_dr of max. 0.5 V (see “Typical Performance
Characteristics” on Page 8) in case of the TLE 4266-2 G. The TLE 4266-2 GSV33
requires a minimum input voltage of 4.4 V.
The TLE 4266-2 can supply up to 150 mA. However for protection reasons at high input
voltage above 25 V, the maximum output current is reduced (SOA protection).
Figure 3 shows a typical measuring circuit. For stability of the control loop the
TLE 4266-2 output requires an output capacitor C_Q of at least 10 µF with a maximum
permissible ESR of 4 Ω. Tantalum as well as multi layer ceramic capacitors are suitable.
At the input of the regulator an input capacitor is necessary for compensating line
influences (100 nF ceramic capacitor recommended). A resistor of approx. 1 Ω in series
with C_I, can damp any oscillation occuring due the input inductivity and the input
capacitor. In the measuring circuit shown in Figure 3 an additional electrolytic input
capacitor of 470 µF is added in order to buffer supply line influences. This capacitor is
recommended, if the device is sourced via long supply lines of several meters.
The TLE 4266-2 includes the Inhibit function. For a voltage above 3.5 V at the INH pin
the regulator is switched on.
Data Sheet
7
Rev. 1.4, 2008-03-10