TS4270 Taiwan Semiconductor Company, Ltd. (TSC), TS4270 Datasheet - Page 4

• Manufacturer Part Number: TS4270
• Description: 5v Ultra Low Dropout Fixed Voltage Regulator
• Manufacturer: Taiwan Semiconductor Company, Ltd. (TSC)

Reset Timing
The power-on reset delay time is defined by the charging time of an external capacitor C
follows:
Definitions:
The reset reaction time t
dropped below the reset threshold. It is typical 1uS for delay capacitor of 47nF. For other values for C
time can be estimated using the following equation:
Test Circuit
Application Circuit
Δt = Reset delay Time t
C
C
I
ΔV = V
V
t
t
D,C
rd
rr
DU
D
D
= ΔV x C
≈ 20s/F x C
= (Δt x I
= Delay capacitors
= Charge current, typical 14uA
= Upper reset timing threshold at C
DU
, typical 1.8V
rr
D,C
D
is the time it takes the voltage regulator to set the reset out LOW after the output voltage has
/I
) / ΔV
D,C
D
rd
Preliminary
5V Ultra Low Dropout Fixed Voltage Regulator
D
for reset delay time
4/9
D
which can be calculated as
D
TS4270
the reaction
Version: A07