CS8120YD14 Cherry Semiconductor Corporation, CS8120YD14 Datasheet - Page 4

• Manufacturer Part Number: CS8120YD14
• Description: 5V/ 300mA Linear Regulator with and ENABLE RESET
• Manufacturer: Cherry Semiconductor Corporation

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.
Figure 1: Composite Output Stage of the CS8120
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Quiescent Current vs. Output Current Over Temperature
0
Voltage Reference and Output Circuitry
V
V
IN
IN
= 14V
50
Precision Voltage Reference
-40°C
100
Output Stage
25°C
V
Output Current (mA)
OUT
150
125°C
2000
1800
1600
1400
1200
1000
200
800
600
400
200
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).
0
Typical Performance Characteristics: continued
1
RESET Output Voltage vs. Output Current
250
5
V
IN
= 5V
300
10
Circuit Description
Reset Output Current (mA)
15
350
4
20
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.
The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 2).
Figure 2: Typical Circuit Waveforms for Output Stage Protection.
V
I
OUT
OUT
V
IN
Output Voltage and Supply Current vs. Input Voltage
25
5.5
5.0
4.0
3.0
2.0
1.0
0.0
0.0
> 30V
Dump
30
Load
35
Output Stage Protection
2.0
40
Circuit
V
Short
Supply Voltage (V)
OUT
4.0
6.0
I
Q
Shutdown
8.0
Thermal
10.0
22.0
20.0
16.0
12.0
8.0
4.0
0.0