CS8120 datasheet(4/8 Pages) CHERRY

4 / 8 page

Precision Voltage Reference

The regulated output voltage depends on the precision

band gap voltage reference in the IC. By adding an error

amplifier into the feedback loop , the output voltage is

maintained within ±4% over temperature and supply

variation.

Output Stage

The composite PNP-

NPN output structure

(Figure 1) provides

300mA (typ) of output

current while maintain-

ing a low drop out volt-

age (1.00V, typ) and

drawing little quiescent

current (2.5mA).

The NPN pass device prevents deep saturation of the out-

put stage which in turn improves the ICÕs efficiency by

preventing excess current from being used and dissipated

by the IC.

Output Stage Protection

The output stage is protected against overvoltage, short

circuit and thermal runaway conditions (Figure 2).

Circuit Description

Typical Performance Characteristics: continued

Voltage Reference and Output Circuitry

VOUT

VIN

IOUT

VOUT

VIN

Load

Dump

Short

Circuit

Thermal

Shutdown

> 30V

Figure 1: Composite Output Stage of the CS8120

5.5

10.0

0.0

Supply Voltage (V)

VOUT

5.0

4.0

3.0

2.0

1.0

0.0

22.0

20.0

16.0

12.0

8.0

4.0

0.0

2.0

4.0

6.0

8.0

Output Voltage and Supply Current vs. Input Voltage

2000

1800

1600

1400

1200

1000

800

600

400

200

VIN = 5V

Reset Output Current (mA)

RESET Output Voltage vs. Output Current

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

050

-40

°C

125

°C

Output Current (mA)

VIN = 14V

100

150

200

250

300

350

Quiescent Current vs. Output Current Over Temperature

Figure 2: Typical Circuit Waveforms for Output Stage Protection.

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