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PDF TS4268 Data sheet ( Hoja de datos )
| Número de pieza | TS4268 | |
| Descripción | 180mA Ultra Low Dropout Voltage Regulator | |
| Fabricantes | Taiwan Semiconductor Company | |
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Hay una vista previa y un enlace de descarga de TS4268 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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Preliminary
TS4268
180mA Ultra Low Dropout Voltage Regulator
with Reset & Watchdog Function
SOP-8
Pin Definition:
1. Input
2. N/C
3. Reset Output
4. Ground
8. Output
7. Watchdog
6. Radj
5. Reset Delay
General Description
TS4268 is a low dropout voltage regulator. The maximum input voltage is 45 V. It can deliver an output current of at
least 180mA. TS4268 is short circuit proof and features temperature protection that disables the circuit in the event of
impermissibly high temperatures. The watchdog function is disabled as a function of the load, so that a controller is not
interrupted during sleep mode by a watchdog reset.
Application Description
TS4268 regulates an input voltage in the range 5.5V ~ 45V. In the event of an output voltage Vout < VRT, a reset signal
is generated. The wiring of the reset switching threshold input enables the value of VRT to be reduced. The reset delay
time can be adjusted using an external capacitor. The integrated watchdog monitors the connected active controller. If
there is no positive going edge at the watchdog input, the reset output is set to low. The reset delay capacitor provides
a wide adjustment range for the pulse repetition time. The watchdog function is only activated if the load exceeds 8mA.
This ensures that a microcontroller is not activated during power-down and the current drain is not increased.
Features
● Output voltage tolerance < ± 2 %
● Very low current consumption
● Low-drop voltage
● Watchdog
● Settable reset threshold
● Over temperature protection
www●.DatRaSehveeert4sUe.cpoomlarity protection
● Short-circuit proof
● Suitable for use in automotive electronics
● Wide temperature range
Ordering Information
Part No.
TS4268CS50 RL
Package
SOP-8
Packing
2.5Kpcs/ 13” Reel
Pin Description
Pin No. Symbol
1 IN
2 N/C
3 RO
4 GND
5 RD
6 RADJ
7 WI
8 OUT
Pin Description
Input Voltage. block to ground directly with ceramic capacitor
Not Connected
Reset Output. the open collector output is connected to the 5V output via an
integrated resistor of 30kΩ
Ground
Reset Delay. connect a capacitor to ground for delay time adjustment.
Reset Switching Threshold. for setting the switching threshold, output to ground with
voltage divider. If this input is connected to ground, the reset is triggered at an output
voltage of 4.5V.
Watchdog Input. positive-edge-triggered input for monitoring a microcontroller.
Output Voltage. block to ground with 22uF capacitor, ESR <3Ω
1/7 Version: Preliminary
1 page  
Test Circuit
Preliminary
TS4268
180mA Ultra Low Dropout Voltage Regulator
with Reset & Watchdog Function
Reset Timing
The power-on reset delay time is defined by charging time of an external capacitor CD which can be calculated as
follow:
www.DataSheet4U.comCD = ( ∆trd x ID,C ) / ∆V
Definitions:
CD = delay capacitor
∆trd = delay time
ID,C = charge current, typical 12uA
∆V = VDU, typical 1.8 V
VDU = upper delay switching threshold at CD for reset delay time
The reset reaction time trr is the time it takes the voltage regulator to set the reset out LOW after the output voltage has
dropped below the reset threshold. It is typically 1uS for delay capacitor of 47nF. For other values for CD the reaction
time can be estimated using the following equation:
Trr ≈ 20 s/F x CD
5/7 Version: Preliminary
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet TS4268.PDF ] | |
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