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CS8101YT5G

Micropower 5.0 V, 100 mA Low Dropout Linear Regulator with RESET and ENABLE

ON Semiconductor 

CS8101

TYPICAL PERFORMANCE CHARACTERISTICS

0.6

0.5

125°C

0.4

25°C

0.3

−40°C

0.2

0.1

0

0 10 20 30 40 50 60 70 80 90 100

Load (mA)

Figure 2. CS8101 Dropout Voltage vs. Load Over Temperature

CIRCUIT DESCRIPTION

VOLTAGE REFERENCE AND OUTPUT CIRCUITRY

Output Stage Protection

The output stage is protected against overvoltage, short

circuit and thermal runaway conditions (Figure 3).

> 30 V

VIN

VOUT

IOUT

Load

Dump

Current

Limit

Short

Circuit

Figure 3. Typical Circuit Waveforms for Output

Stage Protection

If the input voltage rises above 30 V (e.g. load dump), the

output shuts down. This 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 load current capability is reduced

thereby preventing thermal overload. This thermal

management function is an effective means to prevent die

overheating since the load current is the principle heat

source in the IC.

REGULATOR CONTROL FUNCTIONS

The CS8101 contains two microprocessor compatible

control functions: ENABLE and RESET (Figure 4).

For 7.0 V < VIN < 26 V

VIN

ENABLE

VOUT

VIN(H)

VRH

VRL

VRPEAK

RESET

(1)

(2)

VRLO

VRPEAK

(1) = No Reset Delay Capacitor

(2) = With Reset Delay Capacitor

Figure 4. Circuit Waveform

ENABLE Function

The ENABLE function switches the output transistor ON

and OFF. When the voltage on the ENABLE lead exceeds

1.4 V typ, the output pass transistor turns off, leaving a high

impedance facing the load. The IC will remain in Sleep

mode, drawing only 50 mA, until the voltage on this input

drops below the ENABLE threshold.

RESET Function

A RESET signal (low voltage) is generated as the IC

powers up until VOUT is within 250 mV of the regulated

output voltage, or when VOUT drops out of regulation, and

is lower than 300 mV below the regulated output voltage. A

hysteresis of 50 mV is included in the function to minimize

oscillations.

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