GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Description
The GM432 is a low-voltage three-terminal
adjustable precision shunt regulator with
specified thermal stability over full temperature
range. Output voltage can be set to any value
from Vref (1.24V) to 16V by using two external
resistors. The active output circuitry provides a
very unique turn-on characteristic, making them
excellent replacements 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 suppliers.
GM432 is available in SOT23, TO92 and SOT89
packages.
Features
Low-voltage operation, down to 1.24V
0.5%, and 1% reference voltage
tolerance
Adjustable output voltage, from Vref to
16V
Sink Current Capability 80μA to 100mA
Low dynamic output impedance, 0.05W
typical
Wide temperature range, 0° to +70°C
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
Cathode
Reference
Reference
Anode
Cathode
1.24V
Anode
www.gammamicro.com.tw
GM432
V2.00
1
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Marking Information and Pin Configurations (Top View)
SOT23
Anode
2
TO92
SOT89
BBgYW
1
Re
f
3
Cathode
432g
YWW
Ref 1
Ref 1
2
432g
AYWW
3 Cathode
2
Anode
Anode
3 Cathod
e
BB: Product code
g: Grade Code (A: 0.5%, B: 1.0%)
A: Assembly/Test Site Code
Y: Year
W: Week code
WW: Week
Ordering Information
Ordering Number
GM432AT92BG
GM432AT92RLG
GM432AST23RG
GM432AST89RG
GM432AT92BG
GM432AT92RLG
GM432AST23RG
GM432AST89RG
Precision Device Code
0.5%
0.5%
0.5%
0.5%
1.0%
1.0%
1.0%
1.0%
BBB
BBA
Grade
A
A
A
A
B
B
B
B
Package
TO-92
TO-92
SOT-23
SOT-89
TO-92
TO-92
SOT-23
SOT-23
Shipping
1,000 Units/Anti-ESD Bag
2,000 Units/Ammo Pack (Tape)
3,000 Units/Tape & Reel
1,000 Units/Tape & Reel
1,000 Units/Anti-ESD Bag
2,000 Units/Ammo Pack (Tape)
3,000 Units/Tape & Reel
3,000 Units/Tape & Reel
GM432
V2.00
2
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Absolute Maximum Ratings
PARAMETER
Cathode Voltage
Continuous Cathode Current Range
Reference Input Current Range
Power Dissipation at T
A
= 25°C
SOT-23
TO-92
SOT-89
Package Thermal Resistance
SOT23
TO92
SOT89
Operating Ambient Temperature Range
Storage Temperature
Lead Temperature (soldering 10 sec.)
SYMBOL
V
KA
I
K
I
REF
RATINGS
20
100
3mA
0.23
0.78
0.8
336
132
132
0 - 70
- 65 to 150
260
UNITS
V
mA
P
D
W
θ
JA
T
A
°C/W
°C
°C
°C
Recommended Operating Conditions
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL
V
KA
I
K
Min
V
REF
80μA
Max
16V
100mA
Equivalent Schematics
Cathode
800
800
20pF
Reference
3.28K
4K
10k
2.4K
7.2K
20pF
1K
Anode
GM432
V2.00
3
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Electrical Characteristics
(T
A
= 25°C unless otherwise specified)
Parameter
Reference
Voltage
GM432A
GM432B
Symbol
V
REF
V
REF(DEV)
ΔV
REF
/ΔV
KA
I
REF
V
REF(DEV)
I
K(MIN)
Condition
V
KA
= V
REF
, I
K
= 10mA,
Test circuit 1
V
KA
= V
REF
, I
K
= 10mA,
T
A
= 0 to 70°C
I
K
= 10mA
ΔV
KA
= 16V to V
REF
I
K
= 10mA, R1 = 10K, R2 =
∞
Test circuit 2
I
K
= 10mA, R1 = 10K, R2 =
∞
T
A
=Full
range,
Test circuit 2
V
KA
= V
REF
Test
circuit 1
V
KA
= 6V, V
REF
= 0V
Test
circuit 3
V
KA
= 16V, V
REF
= 0V
Test
circuit 3
V
KA
= V
REF
, I
K
= 1mA to 10mA,
f
≤1kHz,
Test circuit 1
Min
1.234
1.228
Typ
1.240
1.240
10
Max
1.246
1.252
25
Unit
V
mV
mV/V
V
REF
Deviation over
Temperature
Ratio of change in V
REF
to change in V
KA
Reference Input Current
I
REF
Deviation over
Temperature
Minimum Cathode
Current
-2.7
-1.0
0.15
0.1
20
0.125
0.135
0.05
0.5
0.4
80
0.150
µA
µA
µA
Off-state cathode Current
I
K(OFF)
µA
0.150
0.15
Ω
Dynamic Impedance
|Z
KA
|
Test Circuits
V
IN
V
KA
V
IN
V
KA
V
IN
V
KA
I
K(OFF)
I
K
R1
V
REF
I
REF
V
REF
I
K
V
REF
R2
GM432
V2.00
Test Circuit 1
V
KA
= V
REF
Test Circuit 2
V
KA
>
V
REF
Test Circuit 3
Off-State
4
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Applications Note
1.
Set V
O U T
according to the follow equation:
V
O U T
= V
R E F
x(1+R1/R2)+I
R E F
xR1
2.
Select proper R
The maximum limit for R should be such
that the cathode current I
K
is greater than
the minimum operating current (80A) at
V
IN(MIN)
The minimum limit for R should be such
that the cathode current, I
K
does not
exceed 100mA under all load conditions,
and the instantaneous turn-on value for I
K
does not exceed 150mA.
Typical Applications
V
In
V
OUT
Figure 1. Shunt Regulator
Figure 2. High Current Shunt Regulator
Figure 3. Output Control for a Three
Terminal Fixed Regulator
Figure 4. Series Pass Regulator
GM432
V2.00
5
京公网安备 11010802033920号
EEWORLD
