tle7273 Infineon Technologies Corporation, tle7273 Datasheet - Page 14

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

The drop across the ESR calculates as:
To prevent a reset the following relationship must be fullfilled:
Example: Assuming a load current step of dI
22µF and a typical 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.
For this expample the typical condition is considered and the calculation is done based
on dt = 25µs:
So for the ESR we can allow
The permissible ESR becomes:
During design-in of the TLE7273 product family, special care needs to be taken with
regards to the regulators reaction time on sudden load current changes starting from
very low pre-load as well as cyclic load changes. The application note “ TLE7x Voltage
Regulators - Application Note about Transient Response at ultra low quiescent current
Voltage Regulators ” (see 3_cip05405.pdf) gives important hints for successful design-in
of the Voltage Regulators of the TLE7x family.
Final-/ *Target Data Sheet
dV
dV
dV
dV
ESR = 186mV/100mA = 1.86Ohm
ESR
C
C
ESR
+ dV
= 0.1A * 25µs/22µF = 114mV
= dI*ESR
= 300mV - 114mV = 186mV
ESR
< 300mV
14
Q
= 50mA, a blocking capacitor of C
Rev. 1.0, 2005-11-30
TLE 7273
Q
=