tle7273 Infineon Technologies Corporation, tle7273 Datasheet - Page 13

• Manufacturer Part Number: tle7273
• Description: Low Drop Voltage Regulator
• Manufacturer: Infineon Technologies Corporation

Application Circiut
Figure 4
A typical application of the TLE 7273 is shown in Fig.4. To prevent the regulation loop
from oscillating a ceramic capacitor ≥ 470nF is required at the output V
most low drop voltage regulators, the TLE 7273 only needs moderate capacitance at the
output and tolerates ceramic capacitors to keep the stability. This offers more design
flexibility to the circuit designer enabling also to operate the device without tantalum
capacitors.
Additionally, a blocking capacitor C
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 at Tj<90°C is to keep the drop over the equivalent serial
resistor (ESR) of the blocking capacitor C
capacitor below 300mV. Since the regulator output current roughly rises linearly with
time the discharge of the capacitor can be calculated as:
Final-/ *Target Data Sheet
Vbatt
E.g. ingnition
47µF
dVC
100kOhm
B
Application Diagram
= dI
100nF
INH
VI
14
13
Q
*dt/C
Inhibit
Reference
Bandgap
Charge
B
Pump
Overtemperature
B
shutdown
of 10 … 47 µF should be used for the output VQ to
TLE 7273
2-5, 10-
GND
12
1
B
13
together with the discharge of the blocking
Reset Generator
Watchdog
Window
and
8
9
1
7
6
5.6kOhm
VQ
RO
WM1
WM2
WDI
Rev. 1.0, 2005-11-30
470nF
C
Q
Q
TLE71273 Application Circuit
. In contrast to
47µF
C
B
TLE 7273
Controller
Mircro
E.g.