MICROELECTRONICS
A
A
Power Management
GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
Description
The GM432's are low-voltage three-terminal adjustable pre-
cision shunt regulators with specified thermal stability over
their full temperature range. Output voltage can be set to
any value from V
ref
(1.24V) to 16V by using two external
resistors. Their active output circuitry provides a very
unique turn-on characteristic, making them excellent re-
placements for zener diodes in many applications such as
onboard regulation and adjustable power supplies. In a
wide range of home applications, these versatile darlings
are ideal voltage references for 3.0V to 3.3V switching
power suppies. With operational cathode current as low as
80µA, batteries keep on going. Whatever your application
is, the GM432's offer the optimum combination of perfor-
mance, reliability, and economy.
Features
Low-voltage operation, down to 1.24V
0.5%, 1% or 2% reference voltage tolerance
Adjustable output voltage, V
O
= V
ref
to 16V
Sink Current Capability 80µA to 100mA
Low dynamic output impedance, 0.05W typical
Wide temperature range, 0
°
to +70
°
C
Pin-to-pin replacement for TLV431, SC431L
Available in SOT-23, SOT-25, SOT-89, TO-92
and SOP-8
Application
Switching power supplies
Linear regulators
Adjustable supplies
Instrumentation
Battery-operated computers,
PDA's portable devices
Monitors, TV's, camcorders
Computer disk drives
LOGIC SYMBOL
BLOCK DIAGRAM (POSITIVE LOGIC)
CATHODE
REFERENCE
REFERENCE
+
ANODE
CATHODE
V
ref
= 1.24V
ANODE
www.gammamicro.com
GM432
V0.11
1
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MICROELECTRONICS
A
A
Power Management
GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
MARKING INFORMATION & PIN CONFIGURATIONS
(TOP VIEW)
SOT-25(SOT-23-5)
ANODE
5
SOT-23
REF
4
TO-92
GM
432G
AYWW
2
Anode
3
XXXYW
1
2
3
1
XXXYW
NC
NC CATHODE
REF
Cathode
1. REF
2. Anode
3. Cathode
1 2
3
SOP-8
SOT-89
ANODE
REF
ANODE
NC
8 7 6 5
GM432G
AYWW
REF
1
2
3
CATHODE
GM432G
AYWW
1 2 3 4
CATHODE
ANODE
NC
ANODE
XXX = Marking Code
G** = Grade
A
= Assembly Location
Y
= Year
WW, W= Weekly
ANODE
ORDERING INFORMATION
Ordering Number Precision Device code
GM432AT92B
GM432AT92RL
GM432AST23R
GM432AST25R
GM432AS8R
GM432AST89R
GM432BT92B
GM432BT92RL
GM432BST23R
GM432BST25R
GM432BS8R
GM432BST89R
GM432CT92B
GM432CT92RL
GM432CST23R
GM432CST25R
0.5%
0.5%
0.5%
0.5%
0.5%
0.5%
1%
1%
1%
1%
1%
1%
2%
2%
2%
2%
2%
2%
MAA
MAA
MAA
MAA
MAA
MAA
MAB
MAB
MAB
MAB
MAB
MAB
MAC
MAC
MAC
MAC
MAC
MAC
C
C
B
B
Grade
A
A
Package
TO-92
TO-92
SOT-23
SOT-25
SOP-8
SOT-89
TO-92
TO-92
SOT-23
SOT-25
SOP-8
SOT-89
TO-92
TO-92
SOT-23
SOT-25
SOP-8
SOT-89
Shipping
1,000 Units/ ESD Bag
2,000 Units/ Ammo Pack(Tape)
3,000 Units/Tape &Reel
3,000 Units/Tape &Reel
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
3,000 Units /Tape &Reel
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
3,000 Units /Tape &Reel
2,500 Units /Tape & Reel
1,000 Units / Tape & Reel
GM432
2
GM432CS8R
GM432CST89R
* 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%
MICROELECTRONICS
A
A
Power Management
GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ABSOLUTE MAXIMUM RATINGS
(over free-air temperature range except as noted)
PARAMETER
Cathode Voltage
(1)
SYMBOL
V
KA
I
K
I
ref
P
D
VALUE
20
100
3
UNIT
V
mA
mA
Continuous cathode current
Reference input current range
Power dissipation at T
A
= 25°C
SOT-23
SOP-8
TO-92
Package thermal impedance
SOT-23
SOT-25
TO-92
SOP-8
(2, 3)
0.37
0.49
0.95
W
q
JA
336
256
132
97
0 to + 70
260
°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
80µA
MAXIMUM
16
100
UNIT
V
mA
GM432
3
MICROELECTRONICS
A
A
Power Management
GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
GM432A
(0.5%)
GM432A
(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 voltage over full
temperature range
Minimum operating
current
Off-state cathode
current
Dynamic impedance
V
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)
MIN
1.234
1.222
TYP
1.240
MAX
1.246
1.258
25
UNIT
V
mV
mV/V
V
dev
V
KA
= V
ref
, I
K
= 10 mA
(1)
DV
ref
DV
KA
I
ref
I
K
= 10mA,
DV
KA
= 16V to V
ref
I
K
= 10mA, R1 = 10KW, R2 =
(2)
10
- 2.7
-1.0
0.15
0.1
0.5
0.4
mA
mA
I
ref(dev)
I
K
= 10mA, R1 = 10KW, R2 =
T
A
= full range
I
K(min)
V = V
KA
ref
(1)
(2)
20
0.125
0.135
0.05
80
0.150
0.150
0.15
mA
I
K(off)
V
KA
= 6V, V
ref
= 0V
(3)
V
KA
= 16V, V
ref
= 0V
(3)
mA
W
| Z
KA
| f 1kHz,V
KA
=V
ref
, I
K
=100mA to 100mA
(1)
GM432B (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 voltage over full
temperature range
Minimum operating
current
Off-state cathode
current
Dynamic impedance
NOTES:
(1) See test circuit 1 on page 4.
(2) See test circuit 2 on page 4.
(3) See test circuit 3 on page 4.
CONDITION
V
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)
MIN
1.228
1.215
TYP
1.240
MAX
1.252
1.258
UNIT
V
mV
mV/V
V
dev
V
KA
= V
ref
, I
K
= 10 mA
(1)
DV
ref
DV
KA
I
ref
I
K
= 10mA,
DV
KA
= 16V to V
ref
I
K
= 10mA, R1 = 10KW, R2 =
(2)
10
- 2.7
-1.0
0.15
0.1
25
0.5
0.4
mA
mA
I
ref(dev)
I
K
= 10mA, R1 = 10KW, R2 =
T
A
= full range
I
K(min)
V = V
(1)
KA
ref
V
KA
= 6V, V
ref
= 0V
(3)
V
KA
= 16V, V
ref
= 0V
(3)
(2)
20
0.125
0.135
0.05
80
0.150
0.150
0.15
mA
I
K(off)
mA
W
| Z
KA
| f 1kHz,V
KA
=V
ref
, I
K
=100mA to 100mA
(1)
GM432
4
MICROELECTRONICS
A
A
Power Management
GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
GM432C (2.0%)
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 voltage over full
temperature range
Minimum operating
current
Off-state cathode
current
Dynamic impedance
NOTES:
(1) See test circuit 1.
(2) See test circuit 2.
(3) See test circuit 3.
CONDITION
V
ref
V
dev
DV
ref
DV
KA
I
ref
V
KA
= V
ref
, I
K
= 10 mA, T
A
= 25°C
V
KA
= V
ref
, I
K
= 10 mA
(1)
I
K
= 10mA,
DV
KA
= 16V to V
ref
I
K
= 10mA, R1 = 10KW, R2 =
(2)
(1)
(1)
MIN
1.215
1.200
TYP
1.240
MAX
1.265
1.280
UNIT
V
mV
mV/V
V
KA
=V
ref
,I
K
=10 mA,T
A
= 0 to +70°C
10
- 2.7
-1.0
0.15
0.1
35
0.5
0.4
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
= 6V, V
ref
= 0V
V
KA
= 16V, V
ref
= 0V
(3)
(3)
(2)
20
0.125
0.135
0.05
80
0.150
0.150
0.15
mA
I
K(off)
mA
W
| Z
KA
| f 1kHz,V
KA
=V
ref
, I
K
=100mA to 100mA
(1)
TEST CIRCUITS
V
IN
V
KA
V
IN
V
KA
l
ref
R1
V
ref
R2
V
ref
l
ref
V
ref
V
IN
V
KA
l
k
(off)
l
k
Test Circuit 1
V
KA
= V
ref
Test Circuit 2
V
KA
> V
ref
Test Circuit 3
Off-State
GM432
5
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