Revision 1, May 2002 www.gammamicro.com
NEGATIVE VOLTAGE REGULATORS
GM7900
PRELIMINARY
1
Output current up to 1.5A
3-Terminal Regulators
Internal Thermal Overload Protection
Output Voltages -5V, -6V, -8V, -12V, -15V,
-18V and -24V
Offer in TO-220, TO-252 and TO-263
Internal Short-Circuit Current Limiting
Output Transistor Safe-Area Compesation
Direct replacements for LM79xx
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Absolute Maximum Ratings:
Post-Regulator Switching DC/DC Converters
Bias Supply for Analog Circuits
Instrumentation and Audio Systems
Logic Systems
Others too numerous to mention
The GM7900 series are classic regulators useful in a
wide range of applications. For example, you can use
them for local on-card regulation to eliminate the
distribution problems associated with single point
regulation.
The wide range of output voltages voltages (-5V to -24V)
make them useful in an endless list of applications.
Although designed as fixed voltage regulators, you can
add a few external components to make adjustable
voltages and currents.
Current limiting prevents the peak output current to a
safe value. Safe-area protection for the output transistor
limits internal power dissipation. If internal power
dissipation becomes too high for the heat sinking
provided, the thermal shutdown circuit activates to
prevent the regulator from overheating. These versatile
workhorses are easy to use.
The GM7900 series is available in TO-220, TO-252 and
TO-263 packages.
Applications:
3
2
1
INPUT
GND
OUTPUT
TO-220 3-LEAD
3
2
1
INPUT
GND
OUTPUT
TO-263 (D2PAK)
(Top View)
(Top View)
Connection Diagrams
(Top View)
GND
TO-252 (D-PAK)
3
2
1
V
IN
V
OUT
Revision 1, May 2002 www.gammamicro.com
NEGATIVE VOLTAGE REGULATORS
GM7900
PRELIMINARY
2
Recommended Operating Conditions
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TYPICAL APPLICATION
GM7900
1
2
3
1
F
2
F
(-) V
IN
(-) V
OUT
0.1
F
When using a negative voltage regulator, bypass capacitors are a must on both the input and output.
Recommended values are 2
F on the input and 1
F on the output. It is considered a good practice to
include a 0.1
F capacitor on the output to improve the transient response. These capacitors can be mylar,
ceramic or tantalum, provided that they have good high frequency characteristics.
Revision 1, May 2002 www.gammamicro.com
NEGATIVE VOLTAGE REGULATORS
GM7900
PRELIMINARY
3
R
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GM7905 ELECTRICAL CHARACTERISTICS at specified Junction Temperature
V
I
=-10V, I
O
=500mA (unless otherwise noted)
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0
5
1
.
0
3
.
1
A
m
I
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A
1
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5
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8
0
.
0
5
.
0
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2
A
GM7906 ELECTRICAL CHARACTERISTICS at specified Junction Temperature
V
I
=-11V, I
O
=500mA (unless otherwise noted)
*Pulse testing tehniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account.
** The specification applies only for DC power dissipation permitted by absolute maximum ratings
Revision 1, May 2002 www.gammamicro.com
NEGATIVE VOLTAGE REGULATORS
GM7900
PRELIMINARY
4
R
E
T
E
M
A
R
A
P
*
S
N
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I
T
I
D
N
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C
T
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,
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1
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A
m
5
=
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V
3
2
-
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t
V
5
.
0
1
-
=
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5
1
C
5
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0
6
.
7
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8
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4
.
8
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5
2
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2
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0
6
1
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m
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7
1
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1
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8
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1
2
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1
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0
6
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5
1
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6
1
V
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A
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0
5
7
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t
A
m
0
5
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=
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0
2
:
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a
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t
C
0
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1
.
0
0
.
1
A
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A
1
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.
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5
.
0
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.
2
A
GM7908 ELECTRICAL CHARACTERISTICS at specified Junction Temperature
V
I
=-14V, I
O
=500mA (unless otherwise noted)
*Pulse testing tehniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account.
** The specification applies only for DC power dissipation permitted by absolute maximum ratings
R
E
T
E
M
A
R
A
P
*
S
N
O
I
T
I
D
N
O
C
T
S
E
T
N
I
M
P
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T
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M
T
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U
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1
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5
.
2
1
-
V
I
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,
A
1
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t
A
m
5
=
V
I
P
,
V
7
2
-
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t
V
5
.
4
1
-
=
# W
5
1
C
5
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4
.
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1
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.
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4
1
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=
C
5
2
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0
8
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m
V
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2
2
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3
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C
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4
5
0
6
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5
.
1
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m
5
=
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2
5
1
0
0
2
V
m
I
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A
m
0
5
7
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A
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0
5
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f
C
5
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0
3
:
V
e
g
a
tl
o
V
t
u
o
p
o
r
D
I
O
A
1
=
C
5
2
1
.
1
V
t
n
e
r
r
u
C
s
a
i
B
C
5
2
2
3
A
m
e
g
n
a
h
c
t
n
e
r
r
u
C
s
a
i
B
V
I
V
0
3
-
o
t
V
5
.
4
1
-
=
C
5
2
1
o
t
C
0
4
0
.
0
5
.
0
A
m
I
O
A
1
o
t
A
m
5
=
6
0
.
0
5
.
0
t
n
e
r
r
u
C
t
u
p
t
u
O
k
a
e
P
C
5
2
1
.
2
A
GM7912 ELECTRICAL CHARACTERISTICS at specified Junction Temperature
V
I
=-19V, I
O
=500mA (unless otherwise noted)
Revision 1, May 2002 www.gammamicro.com
NEGATIVE VOLTAGE REGULATORS
GM7900
PRELIMINARY
5
*Pulse testing tehniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account.
** The specification applies only for DC power dissipation permitted by absolute maximum ratings
R
E
T
E
M
A
R
A
P
*
S
N
O
I
T
I
D
N
O
C
T
S
E
T
N
I
M
P
Y
T
X
A
M
T
I
N
U
*
*
e
g
a
tl
o
V
t
u
p
t
u
O
C
5
2
4
.
4
1
-
5
1
-
6
.
5
1
-
V
I
O
,
A
1
o
t
A
m
5
=
V
I
P
,
V
0
3
-
o
t
V
5
.
7
1
-
=
# W
5
1
C
5
2
1
o
t
C
0
5
2
.
4
1
-
5
1
-
5
7
.
5
1
-
n
o
it
a
l
u
g
e
R
t
u
p
n
I
V
I
V
0
3
-
o
t
V
5
.
7
1
-
=
C
5
2
5
0
0
1
V
m
V
I
V
6
2
-
o
t
V
0
2
-
=
3
0
5
n
o
it
c
e
j
e
R
e
l
p
p
i
R
V
I
z
H
0
2
1
=
f
,
V
5
.
8
2
-
o
t
V
5
.
8
1
-
=
C
5
2
1
o
t
C
0
4
5
0
6
B
d
n
o
it
a
l
u
g
e
R
t
u
p
t
u
O
I
O
A
5
.
1
o
t
A
m
5
=
C
5
2
5
1
0
0
2
V
m
I
O
A
m
0
5
7
o
t
A
m
0
5
2
=
5
5
7
e
g
a
tl
o
V
t
u
p
u
O
f
o
t
n
e
i
c
if
f
e
o
C
e
r
u
t
a
r
e
p
m
e
T
I
O
A
m
5
=
C
5
2
1
o
t
C
0
0
.
1
-
C
/
V
m
e
g
a
tl
o
V
e
s
i
o
N
t
u
p
t
u
O
z
H
k
0
0
1
o
t
z
H
0
1
=
f
C
5
2
5
7
3
:
V
e
g
a
tl
o
V
t
u
o
p
o
r
D
I
O
A
1
=
C
5
2
1
.
1
V
t
n
e
r
r
u
C
s
a
i
B
C
5
2
2
3
A
m
e
g
n
a
h
c
t
n
e
r
r
u
C
s
a
i
B
V
I
V
0
3
-
o
t
V
5
.
7
1
-
=
C
5
2
1
o
t
C
0
4
0
.
0
5
.
0
A
m
I
O
A
1
o
t
A
m
5
=
6
0
.
0
5
.
0
t
n
e
r
r
u
C
t
u
p
t
u
O
k
a
e
P
C
5
2
1
.
2
A
GM7915 ELECTRICAL CHARACTERISTICS at specified Junction Temperature
V
I
=-23V, I
O
=500mA (unless otherwise noted)
R
E
T
E
M
A
R
A
P
*
S
N
O
I
T
I
D
N
O
C
T
S
E
T
N
I
M
P
Y
T
X
A
M
T
I
N
U
*
*
e
g
a
tl
o
V
t
u
p
t
u
O
C
5
2
3
.
7
1
-
8
1
-
7
.
8
1
-
V
I
O
,
A
1
o
t
A
m
5
=
V
I
P
,
V
3
3
-
o
t
V
1
2
-
=
# W
5
1
C
5
2
1
o
t
C
0
1
.
7
1
-
8
1
-
9
.
8
1
-
n
o
it
a
l
u
g
e
R
t
u
p
n
I
V
I
V
3
3
-
o
t
V
1
2
-
=
C
5
2
5
0
6
3
V
m
V
I
V
0
3
-
o
t
V
4
2
-
=
3
0
8
1
n
o
it
c
e
j
e
R
e
l
p
p
i
R
V
I
z
H
0
2
1
=
f
,
V
2
3
-
o
t
V
2
2
-
=
C
5
2
1
o
t
C
0
4
5
0
6
B
d
n
o
it
a
l
u
g
e
R
t
u
p
t
u
O
I
O
A
5
.
1
o
t
A
m
5
=
C
5
2
0
3
0
6
3
V
m
I
O
A
m
0
5
7
o
t
A
m
0
5
2
=
0
1
0
8
1
e
g
a
tl
o
V
t
u
p
u
O
f
o
t
n
e
i
c
if
f
e
o
C
e
r
u
t
a
r
e
p
m
e
T
I
O
A
m
5
=
C
5
2
1
o
t
C
0
0
.
1
-
C
/
V
m
e
g
a
tl
o
V
e
s
i
o
N
t
u
p
t
u
O
z
H
k
0
0
1
o
t
z
H
0
1
=
f
C
5
2
0
5
4
:
V
e
g
a
tl
o
V
t
u
o
p
o
r
D
I
O
A
1
=
C
5
2
1
.
1
V
t
n
e
r
r
u
C
s
a
i
B
C
5
2
2
3
A
m
e
g
n
a
h
c
t
n
e
r
r
u
C
s
a
i
B
V
I
V
3
3
-
o
t
V
1
2
-
=
C
5
2
1
o
t
C
0
4
0
.
0
0
.
1
A
m
I
O
A
1
o
t
A
m
5
=
6
0
.
0
5
.
0
t
n
e
r
r
u
C
t
u
p
t
u
O
k
a
e
P
C
5
2
1
.
2
A
GM7918 ELECTRICAL CHARACTERISTICS at specified Junction Temperature
V
I
=-27V, I
O
=500mA (unless otherwise noted)