MICROELECTRONICS
A
A
Power Management
GM1431
ADJUSTABLE SHUNT REGULATOR
Description
The GM1431 is a three terminal adjustable shunt regulator
with thermal stability guaranteed over temperature. Output
voltage can be adjusted to any value between 2.5V (V
ref
)
and 36V by using two external resistors. The GM1431 has
a typical dynamic output impedance of 0.2W. Active output
circuitry provides a very unique turn on characteristic, mak-
ing the GM1431
an excellent tum on replacement for
zener diodes in many applications such as onboard regula-
tion and adjustable power supplies. The GM1431 is an
ideal voltage reference for 3.0 to 3.3V switching power sup-
plies.
The GM1431 shunt regulator is available with 3 voltage tol-
erances, 0.5%, 1.0% and 2.0% over T
A
= 0°C to + 70°C,
and four package options (SOT-23, TO-92, SOT-89 and
SOP-8). Whatever your application is, the GM1431 offers
the optimum combination of performance, reliability, and
economy.
Features
Sink Current Capability 1 mA to 100mA
Low dynamic output impedance, 0.2W typ.
0.5%, 1% or 2% reference voltage tolerance
Alternate for TL431, TL431, LM431 & AS431
Temperature range 0°C to+ 70 °C
Available in SOT-23, TO-92, SOT-89 and
SOP- 8 packages
Application
Switching power supplies
Linear regulators
Adjustable supplies
Battery-operated computers
Computer disk drives
Instrumentation
LOGIC SYMBOL
BLOCK DIAGRAM (POSITIVE LOGIC)
CATHODE
REFERENCE
REFERENCE
+
_
ANODE
CATHODE
V
ref
ANODE
www.gammamicro.com
GM1431
V0.11
1
MICROELECTRONICS
A
A
Power Management
GM1431
ADJUSTABLE SHUNT REGULATOR
MARKING INFORMATION & PIN CONFIGURATIONS
(TOP VIEW)
TO- 92
GM
1431G
AYWW
1. REF
2. Anode
3. Cathode
1 2
3
SOT-23
Anode
3
SOP- 8
ANODE
REF
ANODE
NC
SOT - 89
8 7 6 5
XXXYW
1
2
GM1431G
AYWW
1 2 3 4
CATHODE
ANODE
NC
ANODE
GM1431G
AYWW
REF
1
2
3
CATHODE
REF
Cathode
ANODE
XXX = Marking Code
G** = Grade
A
= Assembly Location
Y
= Year
WW, W= Weekly
ORDERING INFORMATION
Ordering Number
GM1431AT92B
GM1431AT92RL
GM1431AST23R
GM1431AS8T
GM1431AS8R
GM1431AST89R
GM1431BT92B
GM1431BT92RL
GM1431BST23R
GM1431BS8T
GM1431BS8R
GM1431BST89R
GM1431CT92B
Precision
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
1%
1%
1%
1%
1%
1%
2%
2%
2%
2%
2%
2%
Device code
Grade
A
A
Package
TO-92
TO-92
SOT-23
Shipping
1,000 Units/ ESD Bag
2,000 Units/ Ammo Pack(Tape)
3,000 Units / Tape &Reel
100 Units / Tube
2,500 Units / Tape & Reel
1,000 Units / Tape & Reel
1,000 Units/ ESD Bag
2,000 Units/ Ammo Pack(Tape)
3,000 Units / Tape &Reel
100 Units / Tube
2,500 Units / Tape & Reel
1,000 Units / Tape & Reel
1,000 Units/ ESD Bag
2,000 Units/ Ammo Pack(Tape)
3,000 Units / Tape &Reel
100 Units / Tube
2,500 Units / Tape & Reel
1,000 Units / Tape & Reel
NAA
A
A
A
B
B
NAB
SOP-8
SOP-8
SOT-89
TO-92
TO-92
SOT-23
B
B
B
C
C
NAC
SOP-8
SOP-8
SOT-89
TO-92
TO-92
SOT-23
GM1431
GM1431CT92RL
GM1431CST23R
GM1431CS8T
GM1431CS8R
GM1431CST89R
C
C
C
SOP-8
SOP-8
SOT-89
* For detail Ordering Number identification, please see last page.
**Grade A: indicates Precision of 0.5%, B: indicates Precision of 1%, C: indicates Precision of 2%
2
MICROELECTRONICS
A
A
Power Management
GM1431
ADJUSTABLE SHUNT REGULATOR
EQUIVALENT SCHEMATIC
CATHODE
800W
800W
20pF
REF
150W
3.28KW
4KW
10kW
2.4KW
7.2KW
20pF
1kW
800W
ANODE
* All component values are nominal.
Pin numbers shown are for the D package.
GM1431
3
MICROELECTRONICS
A
A
Power Management
GM1431
ADJUSTABLE SHUNT REGULATOR
ABSOLUTE MAXIMUM RATINGS
(over free-air temperature range except as noted)
PARAMETER
Cathode Voltage
(1)
SYMBOL
V
KA
I
K
I
ref
VALUE
37
-100 to 150
-50µA to 10mA
0.23
0.60
0.78
0.80
336
132
163
132
0 to 70
260
UNIT
V
mA
mA
Continuous cathode current
Reference input current range
Power dissipation at T
A
= 25°C
SOT-23
SOP-8
TO-92
SOT-89
Package thermal impedance
SOT-23
TO-92
SOP-8
SOT-89
(2, 3)
P
D
W
q
JA
°C/W
Operating ambient temperature range
Lead temperature (soldering) 10 seconds
T
A
T
LEAD
T
J
°C
°C
These are stress ratings only. Functional operation of the device at these or any conditions beyond the "recommended
operating conditions" is not implied. Exposure to absolute maximum rated conditions may affect device reliability.
NOTES:
1. Voltage values are with respect to the anode except as noted.
2. Maximum power dissipation is a function of T
J(max)
,
q
JA
and T
A
. Maximum allowable power dissipation at any allowable ambient temperature is
P
D
= (T
J(max)
-
3. Package thermal impedance is calculated per JESD 51.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL
V
KA
I
K
MINIMUM
V
ref
1.0
MAXIMUM
36
100
UNIT
V
mA
GM1431
4
MICROELECTRONICS
A
A
Power Management
GM1431
ADJUSTABLE SHUNT REGULATOR
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
GM1431A (0.5%)
PARAMETER
Reference Input Voltage
V
ref
temp deviation
Ratio of change in V
ref
to change in V
KA
Reference input current
Deviation of reference
input current over full
temperature range
Minimum operating
current
Off-state cathode
current
Dynamic impedance
V
ref
V
dev
DV
ref
DV
KA
I
ref
CONDITION
V
KA
= V
ref
, I
K
= 10 mA, T
A
= 25°C
(1)
V
KA
=V
ref
,I
K
=10 mA,T
A
= 0 to 70°C
(1)
V
KA
= V
ref
, I
K
= 10 mA
(1)
, T
A
= full range
I
K
= 10mA
MIN
2.487
TYP
2.500
4
-2.7
-2.0
-1.0
-0.4
1.3
0.4
4.0
1.2
MAX
2.512
17
UNIT
V
mV
mV/V
mA
mA
DV
KA
= 10V to V
ref
DV
KA
= 36V to 10V
(2)
I
K
= 10mA, R1 = 10KW, R2 =
I = 10mA, R1 = 10KW, R2 =
I
ref(dev) K
T
A
= full range
I
K(min)
V
KA
= V
ref
(1)
V
KA
= 36V, V
ref
= 0V
(3)
V
KA
= 16V, V
ref
= 0V
(3)
(2)
0.4
1.0
mA
I
K(off)
0.1
0.2
1
0.50
mA
W
| Z
KA
| f 1kHz,V
KA
=V
ref
, I
K
=100mA to 100mA
(1)
GM1431B (1.0%)
PARAMETER
Reference Input Voltage
V
ref
temp deviation
Ratio of change in V
ref
to change in V
KA
Reference input current
Deviation of reference
input current over full
temperature range
Minimum operating
current
Off-state cathode
current
Dynamic impedance
NOTES:
(1) See test circuit 1 on page 5.
(2) See test circuit 2 on page 5.
(3) See test circuit 3 on page 5.
CONDITION
V
ref
V
dev
DV
ref
DV
KA
I
ref
V
KA
= V
ref
, I
K
= 10 mA, T
A
= 25°C
(1)
V
KA
=V
ref
,I
K
=10 mA,T
A
= 0 to 70°C
(1)
V
KA
= V
ref
, I
K
= 10 mA
(1)
, T
A
= full range
I
K
= 10mA
MIN
2.474
TYP
2.500
4
MAX
2.525
17
UNIT
V
mV
mV/V
DV
KA
= 10V to V
ref
DV
KA
= 36V to 10V
(2)
-2.7
-2.0
-1.0
-0.4
1.3
0.4
4.0
1.2
I
K
= 10mA, R1 = 10KW, R2 =
mA
mA
I = 10mA, R1 = 10KW, R2 =
I
ref(dev) K
T
A
= full range
I
K(min)
V
KA
= V
ref
(1)
V
KA
= 36V, V
ref
= 0V
(3)
V
KA
= 16V, V
ref
= 0V
(3)
(2)
0.4
1.0
mA
I
K(off)
0.1
0.2
1
0.50
mA
W
| Z
KA
| f 1kHz,V
KA
=V
ref
, I
K
=100mA to 100mA
(1)
GM1431
5
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