IFX 24401TE V50 Infineon Technologies, IFX 24401TE V50 Datasheet - Page 15

• Manufacturer Part Number: IFX 24401TE V50
• Manufacturer: Infineon Technologies

Specifications of IFX 24401TE V50

• Packages: PG-TO252-5
• Automotive Qualified: no
• Regulator Type: single output
• Output Voltage: 5V
• Accuracy: 2.0 %
• Max. Output Current: 300mA

6
Figure 4
Input, Output
An input capacitor is necessary for damping line influences. A resistor of approx. 1 Ω in series with
the LC of the input inductivity and the input capacitor.
The IFX24401 requires a ceramic output capacitor of at least 470 nF. In order to damp influences resulting from
load current surges it is recommended to add an additional electrolytic capacitor of 4.7 µ F to 47 µ F at the output
as shown in
Additionally a buffer capacitor C
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 allowed Headroom of the Application to be supplied (e.g. typ. dV
Since the regulator output current roughly rises linearly with time the discharge of the capacitor can be calculated
as follows:
dVC
The drop across the ESR calculates as:
dV
To prevent a reset the following relationship must be fullfilled:
dV
Example: Assuming a load current change of dI
regulator reaction time under normal operating conditions of dt ~ 25µs and for special dynamic load conditions,
such as load step from very low base load, a reaction time of dt ~ 75µs.
dV
So for the ESR we can allow
dV
The permissible ESR becomes:
ESR = dV
Data Sheet
ESR
C
C
ESR
B
+ dV
= dI
= dI
= dI*ESR
= V
Q
ESR
*dt/C
Q
RH2
ESR
*dt/C
Figure 4
Application Information
Application Diagram
< V
- dV
/ dI
B
= 100mA * 25µs/22µF = 113mV
B
RH
Q
C
= 236mV/100mA = 2.36Ohm
= 350mV - 113mV = 236mV
= 350mV
e. g.
Ignition
V
.
100
Bat
nF
1
2
I
E N
B
of > 10 µ F should be used for the output to suppress influences from load surges
Reference
Bandgap
Charge
Enable
Pump
IFX24401
Overtemperature
GND
3, Tab
Shutdown
Q
= 100mA, a blocking capacitor of C
15
1
Q
5
470
nF
+
4.7
µF
V
CC
Application Information
B
Rev. 1.02, 2009-12-10
= 22µF and a typical
C
Q
IFX24401
I
, can damp
= 350mV).