MICROELECTRONICS
A
A
Power Management
GM431
2.5V ADJUSTABLE SHUNT REGULATOR
Features
Sink Current Capability 1 mA to 100mA
Low dynamic output impedance, 0.2W typ.
Low output noise
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
Description
The GM431 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 GM431 has a
typical dynamic output impedance of 0.2W. Active output
circuitry provides a very unique turn on characteristic, mak-
ing the GM431 an excellent replacement for zener diodes
in many applications such as onboard regulation and ad-
justable power supplies. The GM431 is an ideal voltage ref-
erence for 3.0 to 3.3V switching power supplies.
The GM431 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 GM431 offers
the optimum combination of performance, reliability, and
economy.
Application
Switching power supplies
Linear regulators
Adjustable supplies
Battery-operated computers
Computer disk drives
Instrumentation
LOGIC SYMBOL
BLOCK DIAGRAM (POSITIVE LOGIC)
CATHODE
REFERENCE
_
ANODE
CATHODE
V
ref
ANODE
www.gammamicro.com
GM431
V0.11
1
REFERENCE
+
MICROELECTRONICS
A
A
Power Management
GM431
2.5V ADJUSTABLE SHUNT REGULATOR
MARKING INFORMATION & PIN CONFIGURATIONS
(TOP VIEW)
TO- 92
GM
431G
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
GM431G
AYWW
1 2 3 4
CATHODE
ANODE
NC
ANODE
REF
1
GM431G
AYWW
2
3
CATHODE
REF
Cathode
ANODE
XXX = Marking Code
G** = Grade
A
= Assembly Location
Y
= Year
WW, W= Weekly
ORDERING INFORMATION
Ordering Number
GM431AT92B
GM431AT92RL
GM431AST23R
GM431AS8T
GM431AS8R
GM431AST89R
GM431BT92B
GM431BT92RL
GM431BST23R
GM431BS8T
GM431BS8R
GM431BST89R
GM431CT92B
GM431CT92RL
GM431CST23R
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
AAA
A
A
A
B
B
AAB
SOP-8
SOP-8
SOT-89
TO-92
TO-92
SOT-23
B
B
B
C
C
AAC
SOP-8
SOP-8
SOT-89
TO-92
TO-92
SOT-23
GM431
GM431CS8T
GM431CS8R
GM431CST89R
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
GM431
2.5V 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.
GM431
3
MICROELECTRONICS
A
A
Power Management
GM431
2.5V 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 range
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
°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)
- T
A
)/
q
JA
.
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
GM431
4
MICROELECTRONICS
A
A
Power Management
GM431
2.5V ADJUSTABLE SHUNT REGULATOR
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
GM431A (0.5%)
PARAMETER
Reference 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
V
KA
=V
ref
,I
K
=10 mA,T
A
= 0 to 70°C
(1)
(1)
MIN
2.487
TYP
2.500
4
MAX
2.512
17
UNIT
V
mV
mV/V
V
KA
= V
ref
, I
K
= 10 mA
(1)
, T
A
= full range
I
K
= 10mA
DV
KA
= 10V to V
ref
DV
KA
= 36V to 10V
(2)
-2.7
-2.0
-1.0
-0.4
0.7
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
=1mA to 100mA
(1)
GM431B (1.0%)
PARAMETER
Reference 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
2.475
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
0.7
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
=1mA to 100mA
(1)
GM431
5
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