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MC7918 数据手册 - Freescale（飞思卡尔）
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MC7918数据手册
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DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC7905
MC7905.2
MC7906
MC7908
5.0 V
5.2 V
6.0 V
8.0 V
MC7912
MC7915
MC7918
MC7924
12 V
15 V
28 V
24 V
THREE–TERMINAL
NEGATIVE FIXED
VOLTAGE REGULATORS
Pin 1. Ground
2. Input
3. Output
STANDARD APPLICATION
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 2.0 V above more negative even
during the high point of the input ripple voltage.
These two digits of the type number
indicate nominal voltage.
C
in
is required if regulator is located an
appreciable distance from power supply filter.
C
O
improve stability and transient response.
MC79XX
Input
C
in
*
0.33
µ
F
C
O
**
1.0
µ
F
Output
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D
2
PAK)
3
1
2
3
1
2
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
XX,
**
**
Order this document by MC7900/D
1
MOTOROLA ANALOG IC DEVICE DATA
The MC7900 series of fixed output negative voltage regulators are
intended as complements to the popular MC7800 series devices. These
negative regulators are available in the same seven–voltage options as the
MC7800 devices. In addition, one extra voltage option commonly employed
in MECL systems is also available in the negative MC7900 series.
Available in fixed output voltage options from –5.0 V to –24 V, these
regulators employ current limiting, thermal shutdown, and safe–area
compensation – making them remarkably rugged under most operating
conditions. With adequate heatsinking they can deliver output currents in
excess of 1.0 A.
• No External Components Required
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe–Area Compensation
• Available in 2% Voltage Tolerance (See Ordering Information)
Representative Schematic Diagram
Gnd
V
O
V
I
2.4 k
25
3.6 k
1.2 k
1.1 k
2.0 k
12 k
1.0 k
4.0 k
2.0 k
14.7 k
2.0 k
8.0 k
1.0 k
1.6 k
4.0 k
0.3
10 k
10 k
20 k 20 k
20 pF
10 pF
240
750
R
1
R
2
This device contains 26 active transistors.
ORDERING INFORMATION
Device
Output Voltage
Tolerance
Operating
Temperature Range
Package
MC79XXACD2T 2%
T0° 125°C
Surface Mount
MC79XXCD2T 4%
T
J
=0
°
to +125
°
C
Surface
Mount
MC79XXACT 2%
T
J
=
0°
to
+
125°C
Insertion Mount
MC79XXCT 4%
I
nser
ti
on
M
oun
t
MC79XXBD2T
4%
T
J
=
–
40
°
to +125
°
C
Surface Mount
MC79XXBT
4%
T
J
= –
40°
to
+
125°C
Insertion Mount
XX indicates nominal voltage.
Motorola, Inc. 1996 Rev 6
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