Datasheet

Data Sheet 12 Rev. 1.6, 2008-01-22
TLE 7469
Application Information
Figure 3 Application Diagram with Typical External Components
A typical application of the TLE 7469 is shown in Figure 3. To prevent the regulation
loop from oscillating a ceramic capacitor of
C
Q1/2
≥ 1 µF is required at each of the outputs
Q1 and Q2. In contrast to most low drop voltage regulators the TLE 7469 only needs
moderate capacitance at the outputs and tolerates ceramic capacitors to keep the
stability. This offers more design flexibility to the circuit designer enabling the IC also to
operate without tantalum capacitors.
Additional a buffer capacitor C
B
of > 10µF should be used for each output Q1 and Q2 to
suppress influences from load surges to the voltage levels. This one can either be an
aluminum electrolytic capacitor or a tantalum capacitor following the application
requirements.
A general recommendation is to keep the drop over the equivalent serial resistor (ESR)
together with the discharge of the blocking capacitor below the Reset Headroom (e.g.
min. 130mV for the 2.6V Output).
AEA03529_2.VSD
TLE 7469
Q2
DT
WDI
RO
SO
Q1
XC 164
1 µF
47
µF
10 kΩ
1 µF
47
µF
100 nF
R
Vi
*
100 kΩ
I2
INH
SI
100 nF
V
Bat
47
µF
e. g.
Ignition
Key
I1
GND
= Optional