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MC79L00 Datasheet(PDF) 4 Page - ON Semiconductor

Part No. MC79L00
Description  100 mA Negative Voltage Regulators
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC79L00 Datasheet(HTML) 4 Page - ON Semiconductor

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MC79L00, MC79L00A Series
http://onsemi.com
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ELECTRICAL CHARACTERISTICS (VI = –33 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, 0°C < TJ < +125°C, unless otherwise noted).
MC79L24C
MC79L24AC
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
Output Voltage (TJ = +25°C)
VO
–22.1
–24
–25.9
–23
–24
–25
Vdc
Input Regulation
(TJ = +25°C)
–27 Vdc
≥ VI ≥ –38 Vdc
–27.5 Vdc
≥ VI ≥ –38 Vdc
–28 Vdc
≥ VI ≥ –38 Vdc
Regline
350
300
350
300
mV
Load Regulation
TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA
1.0 mA
≤ IO ≤ 40 mA
Regload
200
100
200
100
mV
Output Voltage
–27 Vdc
≥ VI ≥ –38 V, 1.0 mA ≤ IO ≤ 40 mA
–28 Vdc
≥ VI ≥ –38 Vdc, 1.0 mA ≤ IO ≤ 40 mA
VI = –33 Vdc, 1.0 mA ≤ IO ≤ 70 mA
VO
–21.4
–21.4
–26.4
–26.4
–22.8
–22.8
–25.2
–25.2
Vdc
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB
6.5
6.0
6.5
6.0
mA
Input Bias Current Change
–28 Vdc
≥ VI ≥ –38 Vdc
1.0 mA
≤ IO ≤ 40 mA
∆IIB
1.5
0.2
1.5
0.1
mA
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz)
Vn
200
200
µV
Ripple Rejection
(–29
≤ VI ≤ –35 Vdc, f = 120 Hz, TJ = +25°C)
RR
30
43
31
47
dB
Dropout Voltage
IO = 40 mA, TJ = +25°C
|VI–VO|
1.7
1.7
Vdc
APPLICATIONS INFORMATION
Design Considerations
The MC79L00, A Series of fixed voltage regulators are
designed with Thermal Overload Protections that shuts
down the circuit when subjected to an excessive power
overload condition, Internal Short Circuit Protection that
limits the maximum current the circuit will pass.
In
many
low
current
applications,
compensation
capacitors are not required. However, it is recommended
that the regulator input be bypassed with a capacitor if the
regulator is connected to the power supply filter with long
wire length, or if the output load capacitance is large. An
input bypass capacitor should be selected to provide good
high–frequency characteristics to insure stable operation
under all load conditions. A 0.33
µF or larger tantalum,
mylar, or other capacitor having low internal impedance at
high frequencies should be chosen. The bypass capacitor
should be mounted with the shortest possible leads directly
across the regulator’s input terminals. Normally good
construction techniques should be used to minimize ground
loops and lead resistance drops since the regulator has no
external
sense lead. Bypassing the output is also
recommended.
Figure 1. Positive and Negative Regulator
Figure 2. Standard Application
+Vin
+VO
0.1µF
-Vin
-VO
0.33µF
MC78LXX
MC79LXX
0.1µF
0.33µF
Input
Output
CO**
0.1µF
CI*
0.33µF
MC79LXX
A common ground is required between the input and the output
voltages. The input voltage must remain typically 2.0 V above
the output voltage even during the low point on the ripple voltage.
* CI is required if regulator is located an appreciable
* distance from the power supply filter
** CO improves stability and transient response.


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