MC78BC00 Datasheet, PDF (3/8 Pages) Motorola, Inc – VOLTAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR

MC78BC00 Series
DEFINITIONS
Dropout Voltage – The input/output voltage differential at
which the regulator output no longer maintains regulation
against further reductions in input voltage. Measured when
the output drops 100 mV below its nominal value (which is
measured at 1.0 V differential), dropout voltage is affected by
junction temperature, load current and minimum input supply
requirements.
Line Regulation – The change in output voltage for a
change in input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques
such that average chip temperature is not significantly
affected.
Load Regulation – The change in output voltage for a
change in load current at constant chip temperature.
Maximum Power Dissipation – The maximum total device
dissipation for which the regulator will operate within
specifications.
Supply Current – Current which is used to operate the
regulator chip and is not delivered to the load.
Figure 1. Output Voltage versus Input Voltage
3.2
IO = 0 mA
3.0
IO = 100 mA
2.8
IO = 500 mA
2.6
2.4
MC78BC30NTR
TA = 25°C
2.2
2.0
3.0 4.0
5.0 6.0
7.0 8.0
9.0
Vin, INPUT VOLTAGE (V)
Figure 2. Output Voltage versus Output Current
4.962
4.958
Vin = 6.0 V
4.954
Vin = 5.1 V
4.950
4.946
MC78BC50NTR
& MJD32C
TA = 25°C
4.942
0
100
200
300
400
500
600
IO, OUTPUT CURRENT (mA)
Figure 3. Dropout Voltage versus Output Current
0.50
0.40
TA = 80°C
0.30
TA = 25°C
0.20
0.10
TA = –30°C
MC78BC50NTR & MJD32C
0
0
200
400
600
800
1000 1200
IO, OUTPUT CURRENT (mA)
Figure 4. Ripple Rejection as a
Function of Frequency
60
50
40
30
20
CL = 10 µF
IO = 200 mA
10 TA = 25°C
MC78BC50NTR & MJD32C
0
1.0 k
10 k
100 k
1.0 M
10 M
f, FREQUENCY (Hz)
100 M
MOTOROLA ANALOG IC DEVICE DATA
3