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Datasheet: GM2931-3.3ST89 (Gamma Microelectronics)

100mA Low Dropout Voltage Regulator

 

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GM2931
LOW DROPOUT POSITIVE VOLTAGE REGULATOR
Revision 2, January 2003 1 www.gammamicro.com
PRELIMINARY
TO-92 (TOP VIEW)
Output Current 100 mA
Adjustable and fixed-output versions
Ultra Low Quiescent Current - 100


A typical
Very Low Dropout Voltage - 300mV typical
Reverse Battery Protection
60V Load Dump Protection
-50V Reverse Transient Protection
Short Circuit and Thermal Overload Protection
Current Limiting protection
Mirror-Image Insertion Protection
TO-92, SOT-89, TO-252 and SOP-8 Packages
Direct replacement for LM2931 but with lower
ground current, higher output accuracy, tighter
line and load regulation
The GM2931 positive low dropout voltage regulators are available
in adjustable and fixed-output versions. The GM2931s have
quiescent current of 1mA or less when supplying 10mA loads.
Together with the extremely low dropout voltage required for
proper regulation (0.2V for output currents of 10mA) these
qualities make the GM2931 the ideal regulator for standby power
systems. Applications include memory standby circuits, CMOS
and other low power processor power supplies and any precision
systems requiring up to 100mA of output current.
The GM2931 protects itself and the regulated circuitry from
reverse battery installations or two-battery jumps up to 20V.
During line transients, such as a load dump (60V) when the
input voltage to the regulator might temporarily exceed the
specified maximum operating voltage, the GM2931
automatically shuts down to protect both itself and the load.
The GM2931 is not damaged by temporary mirror-image
insertion. Of course, the GM2931 includes common regulator
features such as short circuit and thermal overload protection.
SOP-8 (TOP VIEW)
PIN CONNECTIONS
1
2
3
4
8
7
6
5
INPUT
GND
NC*
GND
GND
GND
OUTPUT
NC*
*NC = Not internally connected.
1
3
2
GND V
OUT
V
IN
SOT-89 (Top View)
(Fixed Voltage Output)
PIN CONNECTIONS
(Adjustable Voltage Output)
1
2
3
4
8
7
6
5
INPUT
GND
ADJ
GND
GND
GND
OUTPUT
ON/OFF
SOP-8 (TOP VIEW)
APPLICATIONS
High-efficiency linear regulator
Battery-powered systems
Portable/Palmtop/notebook computers
Portable consumer electronics
Portable instrumentation
SMPS post-regulators
2
31
3
2
OUTPUT
GND
INPUT
(Top View)
TAB is GND
TO-252 (D-PAK)
3
2
1
V
IN
V
OUT
GM2931
LOW DROPOUT POSITIVE VOLTAGE REGULATOR
Revision 2, January 2003 2 www.gammamicro.com
PRELIMINARY
ABSOLUTE MAXIMUM RATINGS
*
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* Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply
when operating the device beyond its rated operating conditions.
(Note 1) See circuit in Typical Applications. To ensure constant junction temperature, low duty cycle pulse testing is used.
(Note 2) The maximum power dissipation is a function of maximum junction temperature TJmax, total thermal resistance
JA
, and
ambient temperature T
A
. The maximum allowable power dissipation at any ambient temperature is P
D
= (T
Jmax
- T
A
)/
JA
. If this dissipation
is exceeded, the die temperature will rise above 150C and the GM2931 will go into thermal shutdown. For the GM2931 in the TO-92
package,
JA
is 195C/W; in the SO-8 package,
JA
is 160C/W.
(Note 3) Human body model, 100 pF discharged through 1.5 k
.
.
O
N
T
R
A
P
E
G
A
K
C
A
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3
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3
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0
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5
1
3
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2
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G
9
8
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O
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-
9
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T
S
3
.
3
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1
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2
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G
9
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T
S
0
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5
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G
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3
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S
3
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3
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3
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2
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G
8
S
0
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2
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G
2
9
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T
3
.
3
-
1
3
9
2
M
G
2
9
T
0
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5
-
1
3
9
2
M
G
2
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2
5
2
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T
-
2
C
T
3
.
3
-
1
3
9
2
M
G
2
C
T
0
.
5
-
1
3
9
2
M
G
ORDERING INFORMATION
* Other fixed voltage versions available. Please contact Gamma for more information.
GM2931
LOW DROPOUT POSITIVE VOLTAGE REGULATOR
Revision 2, January 2003 3 www.gammamicro.com
PRELIMINARY
r
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1
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0
4
.
0
%
)
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3
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0
%
)
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N
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A
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0
1
=
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2
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0
0
1
=
-
0
0
3
0
0
6
)
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=
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9
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5
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2
1
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1
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R
(
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3
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.
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V
)
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S
V
S
V
4
.
2
=
-
0
3
0
5
A
V
S
V
6
2
=
-
0
5
4
0
0
6
n
w
o
d
t
u
h
S
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l
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)
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t
o
N
(
V
5
V
T
U
O
V
5
1
-
-
0
1
A
V
3
.
3
V
T
U
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V
5
-
-
0
2
V
2
V
T
U
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V
3
.
3
-
-
0
3
ELECTRICAL CHARACTERISTICS GM2931-3.3
(V
IN
= 14V, I
O
= 100
A, T
J
= 25C , C
O
= 100F), unless otherwise noted
(Note 2) Regulations are measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage
due to heating effects are covered under the specification for thermal regulation.
(Note 3) Line regulation is tested at 150C for I
L
=1mA. For I
L
=100
A and T
J
=125C, line regulation is guaranteed by design to 0.2%.
(Note 4) Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured
at 1V differential.
(Note 5) Ground pin current is the regulator quiscent current. The total current drawn from the source is the sum of ground pin current and
output load current.
(Note 6) Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation
effects. Specifications are for a 50mA load pulse (1.25W) for T = 10ms.
(Note 7) V
REF




V
OUT




(V
IN
- 1V), 2.3V
V
IN




26V, 100
A
I
L




100mA, T
J




T
J MAX
.
(Note 8) Vshutdown




2V, V
IN




26V, V
OUT
= 0
(Note 1) Output or reference voltage temperature coefficients defined as worst case voltage change divided by total temperature range.
GM2931
LOW DROPOUT POSITIVE VOLTAGE REGULATOR
Revision 2, January 2003 4 www.gammamicro.com
PRELIMINARY
(Note 2) Regulations are measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage
due to heating effects are covered under the specification for thermal regulation.
(Note 3) Line regulation is tested at 150C for I
L
=1mA. For I
L
=100
A and T
J
=125C, line regulation is guaranteed by design to 0.2%.
(Note 4) Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured
at 1V differential.
(Note 5) Ground pin current is the regulator quiscent current. The total current drawn from the source is the sum of ground pin current and
output load current.
(Note 6) Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation
effects. Specifications are for a 50mA load pulse (1.25W) for T = 10ms.
(Note 7) V
REF




V
OUT




(V
IN
- 1V), 2.3V
V
IN




26V, 100
A
I
L




100mA, T
J




T
J MAX
.
(Note 8) Vshutdown




2V, V
IN




26V, V
OUT
= 0
(Note 1) Output or reference voltage temperature coefficients defined as worst case voltage change divided by total temperature range.
r
e
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e
m
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P
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4
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1
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5
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5
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0
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t
a
r
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p
m
e
T
e
g
a
tl
o
V
t
u
p
t
u
O
)
1
e
t
o
N
(
-
0
5
0
5
1
C
/
m
p
p
)
2
e
t
o
N
(
n
o
it
a
l
u
g
e
R
e
n
i
L
V
3
1
V
N
I
)
3
e
t
o
N
(
V
6
2
-
1
.
0
4
.
0
%
)
2
e
t
o
N
(
n
o
it
a
l
u
g
e
R
d
a
o
L
A
m
1
I
L
A
m
0
0
1
-
1
.
0
3
.
0
%
)
4
e
t
o
N
(
e
g
a
tl
o
V
t
u
o
p
o
r
D
I
L
A
m
0
1
=
-
0
6
0
0
2
V
m
I
L
A
m
0
0
1
=
-
0
0
3
0
0
6
)
5
e
t
o
N
(
t
n
e
r
r
u
C
d
n
u
o
r
G
I
L
0
0
1
=
A
-
0
0
1
0
5
1
A
I
L
A
m
0
1
=
-
9
.
0
5
.
1
A
m
I
L
A
m
0
0
1
=
-
8
2
1
)
5
e
t
o
N
(
t
n
e
r
r
u
C
d
n
u
o
r
G
t
u
o
p
o
r
D
V
N
I
= V
T
U
O
I
,
V
5
.
0
-
L
0
0
1
=
A
-
0
1
1
0
7
1
A
ti
m
i
L
t
n
e
r
r
u
C
V
T
U
O
0
=
-
0
6
1
0
0
2
A
m
)
6
e
t
o
N
(
n
o
it
a
l
u
g
e
R
l
a
m
r
e
h
T
-
-
5
0
.
0
2
.
0
W
/
%
e
g
a
tl
o
V
e
s
i
o
N
t
u
p
t
u
O
I
,
z
H
k
0
0
1
-
z
H
0
1
L
A
m
0
1
=
C
L
2
.
2
=
F
-
0
0
5
-
s
m
r
V
C
L
3
.
3
=
F
-
0
5
3
-
C
L
3
3
=
F
-
0
2
1
-
o
it
a
R
n
o
it
c
e
j
e
R
e
l
p
p
i
R
f =
I
,
z
H
0
2
1
O
,
A
m
0
1
=
C
O
0
0
1
=
V
,
F
N
I
= V
O
p
p
V
2
+
V
3
+
0
6
-
-
B
d
s
n
o
i
s
r
e
V
e
l
b
a
t
s
u
j
d
A
e
g
a
tl
o
V
e
c
n
e
r
e
f
e
R
-
1
2
.
1
5
3
2
.
1
6
2
.
1
V
)
7
e
t
o
N
(
e
r
u
t
a
r
e
p
m
e
t
r
e
v
O
5
8
1
.
1
-
5
8
2
.
1
t
n
e
r
r
u
C
s
a
i
B
n
i
P
k
c
a
b
d
e
e
F
-
-
0
2
0
4
A
n
.f
e
o
c
e
r
u
t
a
r
e
p
m
e
T
e
g
a
tl
o
V
e
c
n
e
r
e
f
e
R
)
1
e
t
o
N
(
-
0
5
-
C
/
m
p
p
.f
e
o
c
.
p
m
e
t
t
n
e
r
r
u
C
s
a
i
B
n
i
P
k
c
a
b
d
e
e
F
-
-
1
.
0
-
C
/
A
n
t
u
p
n
I
n
w
o
d
t
u
h
S
e
g
a
tl
o
V
c
i
g
o
L
t
u
p
n
I
)
N
O
r
o
t
a
l
u
g
e
R
(
w
o
L
-
3
.
1
7
.
0
V
)
F
F
O
r
o
t
a
l
u
g
e
R
(
h
g
i
H
2
-
-
t
n
e
r
r
u
C
t
u
p
n
I
n
i
p
n
w
o
d
t
u
h
S
V
S
V
4
.
2
=
-
0
3
0
5
A
V
S
V
6
2
=
-
0
5
4
0
0
6
n
w
o
d
t
u
h
S
n
i
t
n
e
r
r
u
C
t
u
p
t
u
O
r
o
t
a
l
u
g
e
R
)
8
e
t
o
N
(
V
5
V
T
U
O
V
5
1
-
-
0
1
A
V
3
.
3
V
T
U
O
V
5
-
-
0
2
V
2
V
T
U
O
V
3
.
3
-
-
0
3
ELECTRICAL CHARACTERISTICS GM2931-5.0
(V
IN
= 14V, I
O
= 100
A, T
J
= 25C , C
O
= 100F), unless otherwise noted
GM2931
LOW DROPOUT POSITIVE VOLTAGE REGULATOR
Revision 2, January 2003 5 www.gammamicro.com
PRELIMINARY
Q1
Q12
Q9
Q6
Q11
Q14
ON/OFF
R7
30k
Z1
Z4
Z3
Z2
R11
50k
R13
48k
R8
3k
R15
140k
R14
184k
R12
30k
D1
Z5
R16
14.7k
Q16
Q7
Q8
R10
30k
R5
2.1k
R4
3.6k
R3
32k
R2
5V: 100k
ADJ:
R1
5V: 28k
ADJ:
Q4
GND
ADJUST
V
OUT
V
IN
Q13
Q15
Q2
Q10
Q3
R19
200k
R18
6k
R6
6k
SCHEMATIC BLOCK DIAGRAM
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