Preliminary

TS4268

180mA Ultra Low Dropout Voltage Regulator

with Reset & Watchdog Function

1/7

Version: Preliminary

SOP-8

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

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

●

Reverse polarity protection

●

Short-circuit proof

●

Suitable for use in automotive electronics

●

Wide temperature range

Ordering Information

Part No.

Package

Packing

TS4268CS50 RL

SOP-8

2.5Kpcs/ 13” Reel

Pin Description

Pin No.

Symbol

Pin Description

1

IN

Input Voltage. block to ground directly with ceramic capacitor

2

N/C

Not Connected

3

RO

Reset Output. the open collector output is connected to the 5V output via an

integrated resistor of 30kΩ

4

GND

Ground

5

RD

Reset Delay. connect a capacitor to ground for delay time adjustment.

6

RADJ

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.

7

WI

Watchdog Input. positive-edge-triggered input for monitoring a microcontroller.

8

OUT

Output Voltage. block to ground with 22uF capacitor, ESR <3Ω

Pin Definition:

8. Output

2. N/C

7. Watchdog

3. Reset Output 6. Radj

4. Ground

5. Reset Delay