TLE 4290D Infineon Technologies, TLE 4290D Datasheet - Page 9

• Manufacturer Part Number: TLE 4290D
• Manufacturer: Infineon Technologies

Specifications of TLE 4290D

• Packages: PG-TO252-5
• Regulator Type: single output
• Output Voltage: 5V
• Accuracy: 2.0 %
• Max. Output Current: 400mA
• Dropout Voltage: 250mV

The power good circuit supervises the output voltage. In case
Good switching threshold the Power Good output PG is set LOW after the power good
reaction time. The power good LOW signal is generated down to an output voltage
to 1 V. A LOW signal at the power good pin informs that the battery was lost and memory
is no longer valid.
The feature should only be used in combination to a microcontroller with internal reset.
For the power good delay time after the output voltage of the regulator is above the reset
threshold, the reset signal is set High again. The reset delay time is defined by the reset
delay capacitor
The Power Good delay time is defined by the charging time of an external delay
capacitor
C
With:
•
•
•
•
Figure 5
Data Sheet
D
V
V
V
V
Q
D
PG
= (
C
t
Δ
I
rd
D,c
V
D
t
= Power Good delay time
Power Good
rd
= Power Good delay capacitor
=
Power-on
= Charge current typical 6 μA
Signal
×
V
C
DU
I
D
D,c
.
, typical 1.8 V
) / Δ
Power Good Timing
t
rd
C
D
V
at pin D.
Thermal
Shutdown
t
rr
Voltage Dip
at Input
9
Undervoltage
Secondary
Spike
V
<
Q
t
rr
falls below the Power
at Output
Overload
Rev. 1.7, 2007-03-20
TLE 4290
V d
dt
AED03074
V
V
=
Q,pgt_i
Q,pgt_d
C
V
V
D, c
DU
D
DL
(1)
V
Q