CS8151(2008) 데이터 시트보기 (PDF) - ON Semiconductor

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CS8151
(Rev.:2008)

5.0 V, 100 mA Low Dropout Linear Regulator with Watchdog, RESET, and Wake Up

ON Semiconductor 

CS8151

APPLICATION NOTES

Operation Without Watchdog

The CS8151 can be operated without the watchdog

functionality by connecting the WDI and Wake Up Pins.

This will eliminate false resets from occurring. Without the

connection, a reset would occur because a watchdog signal

on WDI would not occur in the required time frame. The

Wake Up Pin provides the watchdog signal into the

WDI Pin.

Battery

C1

CDelay

VIN

VOUT

CS8151

WDI

CDelay

RESET

GND Wake Up

VCC

C2

Microprocessor

RESET

Figure 7. Device Operation Without Watchdog Function

Output Stage Protection

Stability Considerations

The output stage is protected against overvoltage, short

The output or compensation capacitor C2 (see Figure 9)

circuit and thermal runaway conditions (see Figure 8).

helps determine three main characteristics of a linear

If the input voltage rises above the overvoltage shutdown regulator: startup delay, load transient response and loop

threshold (e.g. load dump), the output shuts down. This stability.

response protects the internal circuitry and enables the IC to

survive unexpected voltage transients.

Should the junction temperature of the power device

exceed 180°C (Typ) the power transistor is turned off.

Thermal shutdown is an effective means to prevent die

VIN

C1*

0.1 mF

VOUT

CS8151

RRST

C2**

10 mF

overheating since the power transistor is the principle heat

source in the IC.

RESET

> 50 V

VIN

VOUT

IOUT

Load

Dump

Short

Circuit

Thermal

Shutdown

Figure 8. Typical Circuit Waveforms for Output

Stage Protection

*C1 required if regulator is located far from the power

supply filter.

**C2 required for stability.

Figure 9. Test and Application Circuit Showing

Output Compensation

The capacitor value and type should be based on cost,

availability, size and temperature constraints. A tantalum or

aluminum electrolytic capacitor is best, since a film or

ceramic capacitor with almost zero ESR can cause

instability. The aluminum electrolytic capacitor is the least

expensive solution, but, if the circuit operates at low

temperatures (−25°C to −40°C), both the value and ESR of

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