Gamma GM432AT92BG 1.24v adjustable precision shunt regulator Datasheet

GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Description
Features
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.
‹
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
z
Switching power supplies
z
Battery-operated computers,
z
Linear regulators
z
PDA's portable devices
z
Adjustable supplies
z
Monitors, TV's, camcorders
z
Instrumentation
z
Computer disk drives
Logic Symbol
Block Diagram
Cathode
Reference
Reference
Cathode
1.24V
Anode
www.gammamicro.com.tw
GM432V2.00
Anode
1
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Marking Information and Pin Configurations (Top View)
SOT23
TO92
Anode
2
432g
YWW
BBgYW
1
Ref
SOT89
432g
AYWW
Ref 1
3
Cathode
Ref 1
2
3 Cathode
3 Cathode
2
Anode
Anode
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
GM432V2.00
Ordering Number
2
Precision Device Code
Grade
Package
Shipping
GM432AT92BG
0.5%
A
TO-92
1,000 Units/Anti-ESD Bag
GM432AT92RLG
0.5%
A
TO-92
2,000 Units/Ammo Pack (Tape)
GM432AST23RG
0.5%
A
SOT-23
3,000 Units/Tape & Reel
GM432AST89RG
0.5%
A
SOT-89
1,000 Units/Tape & Reel
GM432AT92BG
1.0%
B
TO-92
1,000 Units/Anti-ESD Bag
GM432AT92RLG
1.0%
B
TO-92
2,000 Units/Ammo Pack (Tape)
GM432AST23RG
1.0%
B
SOT-23
3,000 Units/Tape & Reel
GM432AST89RG
1.0%
B
SOT-23
3,000 Units/Tape & Reel
BBA
BBB
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Absolute Maximum Ratings
PARAMETER
Cathode Voltage
Continuous Cathode Current Range
Reference Input Current Range
Power Dissipation at TA = 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
RATINGS
UNITS
VKA
IK
IREF
20
100
3mA
V
mA
PD
0.23
0.78
0.8
W
336
132
132
0 - 70
- 65 to 150
260
θJA
TA
°C/W
°C
°C
°C
Recommended Operating Conditions
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL
Min
Max
VKA
IK
VREF
80μA
16V
100mA
Equivalent Schematics
Cathode
800
800
20pF
Reference
3.28K
4K
10k
7.2K
1K
Anode
GM432V2.00
2.4K
20pF
3
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Electrical Characteristics (TA = 25°C unless otherwise specified)
Parameter
Reference
Voltage
Symbol
GM432A
GM432B
VREF Deviation over
Temperature
Condition
Min
Typ
Max
VREF
VKA = VREF, IK = 10mA,
Test circuit 1
1.234
1.240
1.246
1.228
1.240
1.252
VREF(DEV)
VKA = VREF, IK = 10mA,
TA = 0 to 70°C
10
25
Unit
V
mV
Ratio of change in VREF
to change in VKA
ΔVREF/ΔVKA
Reference Input Current
IREF
IK = 10mA, R1 = 10K, R2 = ∞
Test circuit 2
0.15
0.5
µA
IREF Deviation over
Temperature
VREF(DEV)
IK = 10mA, R1 = 10K, R2 = ∞
TA =Full range, Test circuit 2
0.1
0.4
µA
Minimum Cathode
Current
IK(MIN)
VKA = VREF
Test circuit 1
20
80
µA
VKA = 6V, VREF = 0V
Test circuit 3
0.125
0.150
VKA = 16V, VREF = 0V
Test circuit 3
0.135
0.150
VKA = VREF, IK = 1mA to 10mA,
f ≤1kHz, Test circuit 1
0.05
0.15
Off-state cathode Current
IK(OFF)
Dynamic Impedance
|ZKA|
IK = 10mA ΔVKA = 16V to VREF
-2.7
-1.0
mV/V
µA
Ω
Test Circuits
VIN
VKA
IK
VIN
VKA
VREF
GM432V2.00
VREF
4
Test Circuit 1
VKA = VREF
IK
R1
R2
VIN
VKA
IK(OFF)
IREF
VREF
Test Circuit 2
VKA > VREF
Test Circuit 3
Off-State
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
z
The maximum limit for R should be such
that the cathode current I K is greater than
the minimum operating current (80A) at
VIN(MIN)
z
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
VOUT
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
GM432V2.00
VIn
5
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
GM432V2.00
Typical Applications
6
Figure 5. Constant Current Source
Figure 6. Constant Current Sink
Figure 7. TRIAC Crowbar
Figure 8. SRC Crowbar
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Figure 9. Cathode Current vs
Cathode Voltage
Figure 10. Cathode Current vs
Cathode Voltage
Figure 11. Ref Voltage vs. Junction
Temperature
Figure 12. Ref Input Current vs.
Junction Temperature
GM432V2.00
Typical Characteristics
7
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Stability Boundary Conditions
When using the GM432 as a shunt regulator, the
stability could be optimized by setting CL either (1)
no load capacitance across the GM432, decouple
at the load; or (2) large capacitance across the
GM432, optional decoupling at the load. The
GM432 can become unstable with capacitances
of approximately 10nF to 1μF when cathode
current is less than 3mA or so, with instability
increasing as cathode current is reduced.
For example, cathode current of 10mA with a
0.1μF capacitor across it, it can oscillate
transiently as the cathode current rises through
the region of instability. To avoid this problem
completely, simply eliminate the capacitor or
select a very low or very high (e.g. 10μF)
capacitor CL. Since you will probably want local
decoupling at the load, the best idea is to use no
capacitance across the device. Just the
resistance and capacitance of the PCB traces will
prevent local load decoupling from causing
GM432V2.00
transient oscillation during start-up.
8
* Stability boundary condition test shows that tantalum
capacitors are recommended to minimize the conditions
that may cause the device to oscillate.
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Small Signal Gain and Phase
Figure 14. Test Circuit – Small Signal
Gain and Phase
Figure 13. Small Signal Voltage Gain/Phase
Margin vs. Frequency
Package Outline Dimensions – SOT 23
0.110 - 0.120
(2.80 - 3.04)
0.003 - 0.007
(0.08 - 0.18)
0.013 - 0.017
(0.34 - 0.44)
0.013 - 0.017
(0.34 - 0.44)
0.083 - 0.104
(2.11 - 2.62)
0.047 - 0.055
(1.20 - 1.40)
0 - 8 typ
0.0150 - 0.0200
(0.382 - 0.508)
0.037
(0.93) Typ.
0.0005 - 0.0040
(0.025 - 0.102)
GM432V2.00
0.075
Typ.
(1.91)
9
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Package Outline Dimensions – SOT 89
0.173 - 0.181
(4.39 - 4.59)
0.061 REF
(1.550 REF)
0.084 - 0.090
(2.13 - 2.28)
0.155 - 0.167
(3.94 - 4.24)
0.055 - 0.063
(1.39 - 1.60)
0.014 - 0.017
(0.35 - 0.43)
0.090 - 0.102
(2.28 - 2.59)
8
0.035 - 0.047
(0.89 - 1.19)
0.016 - 0.023
(0.400 - 0.580)
0.013 - 0.021
(0.320 - 0.520)
0.059 BSC
(1.49) BSC
0.118 BSC
(2.99) BSC
Package Outline Dimensions – TO 92
3.85 - 4.19
4.7 - 5.2
4.9 - 5.2
12.7 - 14.2
0.4 - 0.55
Typ.
1.22 - 1.32
GM432V2.00
2.10 - 2.27
10
Dimensions are in millimeters
GM432
1.24V ADJUSTABLE PRECISION
SHUNT REGULATORS
Ordering Number
GM 432
APM
Gamma
Micro
Circuit Type
A
ST23
R
Output
Accuracy
Package Type
Shipping Type
A: 0.5%
B: 1.0%
T92: TO-92
ST23:SOT-23
ST89: SOT-89
B: Bag
RL: Ammo Pack (Tape)
T: Tube
R: Tape & Reel
G
G:Green
Note:
Pb-free products:
♦
RoHS compliant and compatible with the current require-ments of IPC/JEDEC J-STD-020.
♦
Suitable for use in Pb-free soldering processes with 100% matte tin (Sn) plating.
♦
Lead-free (RoHS compliant)
♦
Halogen free(Br or Cl does not exceed 900ppm by weight in homogeneous material and total of
Br and Cl does not exceed 1500ppm by weight)
GM432V2.00
Green products:
11
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