Gamma GM432CST23R 1.24v adjustable precision shunt regulator Datasheet

A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
Features
Description
The GM432's are low-voltage three-terminal adjustable pre-
Low-voltage operation, down to 1.24V
cision shunt regulators with specified thermal stability over
0.5%, 1% or 2% reference voltage tolerance
their full temperature range. Output voltage can be set to
Adjustable output voltage, VO = Vref to 16V
any value from Vref (1.24V) to 16V by using two external
resistors. Their active output circuitry provides a very
unique turn-on characteristic, making them excellent re-
Sink Current Capability 80µA to 100mA
Low dynamic output impedance, 0.05W typical
placements for zener diodes in many applications such as
Wide temperature range, 0° to +70°C
onboard regulation and adjustable power supplies. In a
Pin-to-pin replacement for TLV431, SC431L
wide range of home applications, these versatile darlings
Available in SOT-23, SOT-25, SOT-89, TO-92
are ideal voltage references for 3.0V to 3.3V switching
and SOP-8
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 performance, reliability, and economy.
Application
Switching power supplies
Battery-operated computers,
Linear regulators
PDA's portable devices
Adjustable supplies
Monitors, TV's, camcorders
Instrumentation
Computer disk drives
LOGIC SYMBOL
BLOCK DIAGRAM (POSITIVE LOGIC)
CATHODE
REFERENCE
+
REFERENCE
ANODE
CATHODE
V ref
GM432 V0.11
_
= 1.24V
ANODE
www.gammamicro.com
1
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
MARKING INFORMATION & PIN CONFIGURATIONS (TOP VIEW)
SOT-25(SOT-23-5)
ANODE
REF
5
4
Anode
2
NC
GM
432G
AYWW
3
XXXYW
XXXYW
1
TO-92
SOT-23
2
1
3
REF
NC CATHODE
1. REF
2. Anode
3. Cathode
Cathode
SOP-8
SOT-89
1 2
ANODE
REF
3
ANODE
NC
8 7 6 5
GM432G
AYWW
GM432G
AYWW
1 2 3 4
REF 1
2
3 CATHODE
CATHODE
ANODE
ANODE
NC
ANODE
XXX = Marking Code
G** = Grade
A
= Assembly Location
Y
= Year
WW, W= Weekly
ORDERING INFORMATION
GM432
Ordering Number Precision Device code
2
Grade
Package
Shipping
GM432AT92B
0.5%
MAA
A
TO-92
1,000 Units/ ESD Bag
GM432AT92RL
0.5%
MAA
A
TO-92
2,000 Units/ Ammo Pack(Tape)
GM432AST23R
0.5%
MAA
SOT-23
3,000 Units/Tape &Reel
GM432AST25R
0.5%
MAA
SOT-25
3,000 Units/Tape &Reel
GM432AS8R
0.5%
MAA
SOP-8
2,500 Units /Tape & Reel
GM432AST89R
0.5%
MAA
SOT-89
1,000 Units / Tape & Reel
GM432BT92B
1%
MAB
B
TO-92
1,000 Units/ ESD Bag
GM432BT92RL
1%
MAB
B
TO-92
2,000 Units/ Ammo Pack(Tape)
GM432BST23R
1%
MAB
SOT-23
3,000 Units /Tape &Reel
GM432BST25R
1%
MAB
SOT-25
3,000 Units /Tape &Reel
GM432BS8R
1%
MAB
SOP-8
2,500 Units /Tape & Reel
GM432BST89R
1%
MAB
SOT-89
1,000 Units / Tape & Reel
GM432CT92B
2%
MAC
C
TO-92
1,000 Units/ ESD Bag
TO-92
2,000 Units/ Ammo Pack(Tape)
GM432CT92RL
2%
MAC
GM432CST23R
2%
MAC
SOT-23
3,000 Units /Tape &Reel
GM432CST25R
2%
MAC
SOT-25
3,000 Units /Tape &Reel
GM432CS8R
2%
MAC
SOP-8
2,500 Units /Tape & Reel
GM432CST89R
2%
MAC
SOT-89
1,000 Units / Tape & Reel
C
* 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%
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ABSOLUTE MAXIMUM RATINGS (over free-air temperature range except as noted)
SYMBOL
VALUE
UNIT
VKA
20
V
Continuous cathode current
IK
100
mA
Reference input current range
Iref
3
mA
PD
0.37
0.49
0.95
W
q JA
336
256
132
97
TA
0 to + 70
°C
TLEAD
260
°C
PARAMETER
Cathode Voltage (1)
Power dissipation at TA = 25°C
SOT-23
SOP-8
TO-92
Package thermal impedance
SOT-23
SOT-25
TO-92
SOP-8
(2, 3)
Operating ambient temperature range
Lead temperature (soldering) 10 seconds
°C/W
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 TJ(max), qJA and TA. Maximum allowable power dissipation at any allowable ambient temperature is
PD = (TJ(max) - TA)/ qJA.
3. Package thermal impedance is calculated per JESD 51.
SYMBOL
MINIMUM
MAXIMUM
UNIT
Cathode Voltage
VKA
Vref
16
V
Cathode Current
IK
80µA
100
mA
PARAMETER
GM432
RECOMMENDED OPERATING CONDITIONS
3
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)
GM432A (0.5%)
GM432A
(0.5%)
PARAMETER
CONDITION
(1)
VKA = Vref, IK = 10 mA, TA = 25°C
(1)
VKA=Vref,IK=10 mA,TA= 0 to +70°C
Reference input Voltage
Vref
Vref temp deviation
Vdev VKA = Vref, IK = 10 mA (1)
Ratio of change in Vref
to change in VKA
DVref
DVKA
Reference input current
Iref
Deviation of reference
input voltage over full
temperature range
IK = 10mA, DVKA = 16V to Vref
MIN
TYP
MAX
UNIT
1.234
1.222
1.240
1.246
1.258
V
10
25
mV
- 2.7
IK = 10mA, R1 = 10KW, R2 =
(2)
Iref(dev) IK = 10mA, R1 = 10KW, R2 =
TA = full range
(2)
0.15
Minimum operating
current
IK(min) V = V
KA
ref
Off-state cathode
current
IK(off)
Dynamic impedance
| ZKA | f 1kHz,VKA=Vref, IK=100mA to 100mA (1)
mV/V
0.5
mA
0.1
0.4
mA
20
80
mA
0.125
0.150
0.135
0.150
0.05
0.15
W
MIN
TYP
MAX
UNIT
1.228
1.215
1.240
1.252
1.258
V
10
25
mV
(1)
VKA = 6V, Vref = 0V (3)
VKA = 16V, Vref = 0V
-1.0
(3)
mA
GM432B (1.0%)
PARAMETER
GM432
VKA = Vref, IK = 10 mA, TA = 25°C
Reference input Voltage
Vref
Vref temp deviation
Vdev VKA = Vref, IK = 10 mA (1)
DVref
Ratio of change in Vref
to change in VKA
DVKA
Reference input current
Iref
(1)
VKA=Vref,IK=10 mA,TA= 0 to +70°C(1)
IK = 10mA, DVKA = 16V to Vref
- 2.7
IK = 10mA, R1 = 10KW, R2 =
(2)
Deviation of reference
input voltage over full
temperature range
Iref(dev) IK = 10mA, R1 = 10KW, R2 =
TA = full range
(2)
Minimum operating
current
IK(min) V = V (1)
KA
ref
Off-state cathode
current
IK(off)
Dynamic impedance
| ZKA | f 1kHz,VKA=Vref, IK=100mA to 100mA (1)
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.
4
CONDITION
VKA = 6V, Vref = 0V (3)
VKA = 16V, Vref = 0V
(3)
-1.0
mV/V
0.15
0.5
mA
0.1
0.4
mA
20
80
mA
0.125
0.135
0.150
0.150
mA
0.05
0.15
W
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)
GM432C (2.0%)
PARAMETER
CONDITION
Reference input Voltage
Vref
Vref temp deviation
Vdev
Ratio of change in Vref
to change in VKA
DVKA
Reference input current
Iref
DVref
VKA = Vref, IK = 10 mA, TA = 25°C
(1)
VKA=Vref,IK=10 mA,TA= 0 to +70°C
(1)
MIN
TYP
MAX
1.215
1.240
1.265
1.280
1.200
VKA = Vref, IK = 10 mA (1)
10
- 2.7
IK = 10mA, DVKA = 16V to Vref
IK = 10mA, R1 = 10KW, R2 =
(2)
Deviation of reference
input voltage over full
temperature range
I = 10mA, R1 = 10KW, R2 =
Iref(dev) K
TA = full range
(2)
Minimum operating
current
IK(min) VKA = Vref (1)
Off-state cathode
current
IK(off)
Dynamic impedance
| ZKA | f 1kHz,VKA=Vref, IK=100mA to 100mA (1)
VKA = 6V, Vref = 0V (3)
VKA = 16V, Vref = 0V (3)
35
-1.0
UNIT
V
mV
mV/V
0.15
0.5
mA
0.1
0.4
mA
20
80
mA
0.125
0.135
0.150
0.150
mA
0.05
0.15
W
NOTES:
(1) See test circuit 1.
(2) See test circuit 2.
(3) See test circuit 3.
TEST CIRCUITS
VIN
VKA
VIN
VKA
lref
lk
VIN
VKA
lk(off)
R1
V ref
R2
lref
Vref
Test Circuit 1
V KA = V ref
Test Circuit 2
V KA > V ref
Test Circuit 3
Off-State
GM432
Vref
5
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
TYPICAL APPLICATIONS
GM432A, GM432B
Vin
Vout
Vout
Vin
R1
R1
R2
R2
R1
Vout=( 1+ R2 ) Vref
Vout=( 1+
Figure 1. Shunt Regulator
Vin
R1
) Vref
R2
Figure 2. High Current Shunt Regulator
Vout
Vin
GM 7805
In
Out
Common
Vout
R1
R1
R2
R2
Vout=(1+
R1
)Vref
R2
Vout=(1+
Vout(min) = Vref+ 5.0V
Vout(min) = Vref+ Vbe
Figure 3. Output Control for a Three
Terminal Fixed Regulator
RCL
Vin
Iout
R1
) Vref
R2
2.0V
Figure 4. Series Pass Regulator
Vin
Isink
Vout
V
Isink= ref
RS
Iout=
Vref
RS
RCL
Figure 6. Constant Current Sink
Figure 5. Constant Current Source
Vout
Vin
Vout
Vin
R1
GM432
R1
6
R2
R2
Vout(trip)=(1 +
R1
) Vref
R2
Figure 7. TRIAC Crowbar
Vout(trip)=(1 +
R1
) Vref
R2
Figure 8. SRC Crowbar
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
TYPICAL APPLICATION CIRCUIT
Notes:
1. Set VOUT according to the following equation:
VOUT = VREF ( 1 +
R
V IN
V OUT
R1
R1
)+ IREF R1
R2
2. Choose the value for R as follows:
The maximum limit for R should be such that the cathode current, IK, is greater
than the minimum operating current (80µA) at VIN(MIN)*
V REF
GM432
The minimum limit for R should be such that the cathode current, IK, does not
exceed 100mA under all load conditions, and the instantaneous turn-on value
for IK does not exceed 150 mA. Both of the following conditions must be met:
R2
GND
Rmin
VIN(max)
150mA
(to limit instantaneous turn-on IK)
VIN(max)-VOUT
Rmin
IOUT(min)+100mA
(to limit IK under normal operating conditions)
Typical Performance Characteristics
200
V KA =V REF
T A =25°C
175
10
I K Cathode current (mA)
I K Cathode Current (mA)
15
5
0
150
V KA =V REF
T A =25 C
125
100
75
I min
50
25
0
-5
-25
-10
-2
-1
0
0.5
1
-50
-1
1.5
0
0.5
1
1.5
Cathode Voltage (V)
V KA Cathode Voltage (V)
Figure 10. Cathode Current vs.
Cathode Voltage
Figure 9. Cathode Current vs.
Cathode Voltage
250
1.2440
I K =10 mA
I K =10 mA
200
150
100
50
1.2420
1.2400
1.2380
1.2360
0
0
10
20
30
40
50
60
70
T J , Junction Temperature - C
Figure 11. Ref. Voltage vs. Junction
Temperature
1.2340
0
10
20
30
40
50
60
70
T J , Junction Temperature - C
Figure 12. Ref. Input Current vs.
Junction Temperature
GM432
R1=10KW
R2= Open
IREG, Reference Voltage - V
IREG, Reference Input Current (nA)
-0.5
7
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
Stability Boundary Conditions
A Note About Stability
16
When using the GM432 as a shunt regulator, you can
TA=25°C
optimize stability by setting CL either (1) no load ca-
VKA=Vref
14
pacitance across the GM432, decouple at the load; or
(2) large capacitance across the GM432, optional de-
Cathode Current-mA
12
coupling at the load. The GM432 can become unstable with capacitances of approximately 10nF to 1µF
10
when cathode currents are less than 3mA or so, with
Stable
8
instability increasing as cathode current is reduced.
So, while the GM432 is happily stable at, for example,
6
cathode current of 10mA with a 0.1µF capacitor
across it, it can oscillate transiently as the cathode cur-
4
VKA=2V
rent rises through the region of instability. To avoid
this problem completely, simply eliminate the capaci-
2
tor or select a very low or very high (e.g. 10µF) capac-
VKA=3V
0
0.001
0.01
0.1
1
10
itor CL. Since you will probably want local decoupling
at the load, the best idea is to use no capacitance
CL - Load Capacitance - µF
Tantalum Capacitors
across the device. Just the resistance and capacitance of the PCB traces and vias will prevent local
load decoupling from causing transient oscillation during start-up. If you place the GM432 right next to the
1.0
Cathode Current-mA
TA=25°C
load, with the load decoupling capacitor directly
0.8
across it, you must use a capacitor of
VKA=Vref
Stable
0.4
R
0.2
For VKA= 2 & 3V
Device does not
Oscillate
0.01
0.1
1
10
CL - Load Capacitance - µF
Tantalum Capacitors
IK
+
R1
_
CL
GM432
R2
* Stability boundary condition test shows that tantalum capacitors
are recommended to minimize the conditions that may cause
the device to oscillate.
GM432
10µF.
0.6
0
0.001
8
nF or
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
0
IK=10mA
TA=25°C
OUT
36
72
60
108
144
40
180
20
IK
15k
Phase Shift in degrees
Av - Small Signal Voltage
Gain/Phase Margin - dB
80
232
10 µF
GM432
+
8.25k
-
0
-20
100
1K
10K
100K
GND
1M
f - Frequency - Hz
Figure 13. Small Signal Voltage Gain/ Phase
Margin vs. Frequency
Figure 14. Test Circuit - Small - Signal Gain
and Phase
SOT-23 PACKAGE OUTLINE DIMENSIONS
2.90 ± 0.1
0.13
0.4 ± 0.1
0~0.1
Pad Layout
1.5 ± 0.05
2.8 ± 0.1
0.031
0.8
0.035
0.65 ± 0.05
0.9
0.95 ± 0.038
0.079
0.8 ± 0.05
1.9 ± 0.05
2.0
1.10 ± 0.1
Unit: mm
0.037
0.037
0.95
0.95
Inches
( mm )
GM432
5°
9
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
SOT-25(SOT-23-5) PACKAGE OUTLINE DIMENSIONS
2.9 ± 0.1
1.9 ± 0.05
0.13
0.95 ± 0.038
Pad Layout
0.028
0.7
0~0.1
1.5 ± 0.05
0.039
1.0
2.8 ± 0.1
0.094
2.4
0.65 ± 0.05
0.8 ± 0.05
0.35 ± 0.03
0.037
0.95
5°
0.037
0.95
0.074
1.9
5°
( Inches
mm )
1.10 ± 0.1
SOP-8 PACKAGE OUTLINE DIMENSIONS
0.008 +0.0018
-0.0005
0.200
+0.05
-0.01
0 ° ~ 8°
0.028
0.710
+0.013
-0.022
Pad Layout
+0.33
-0.56
0.060
1.52
0.236 ± 0.008
5.990
+0.21
-0.20
0.154
+0.003
-0.004
0.275
0.155
7.0
4.0
PIN INDENT
3.91 ± 0.1
0.024
0.050
0.6
1.270
GM432
Inches
( mm )
10
0.063 ± 0.005
1.600 ± 0.130
0.191
+0.002
-0.004
4.850
+0.05
-0.10
0.057 NOM
1.450 NOM
( Inches )
mm
0.007 ± 0.003
0.175 ± 0.075
0.050 NOM
1.270 NOM
0.016
+0.004
-0.003
0.410
+0.10
-0.08
A
Power Management
GM432
A
MICROELECTRONICS
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
SOT-89 PACKAGE OUTLINE DIMENSIONS
4.50 ± 0.05
1.650 REF
Units: mm
Pad Layout
1.50 ± 0.05
1.400 REF
2
R 0.13~4X
R 0.13~3X
NO DRAFT~2
3
4.20 ± 0.05
2.5 ± 0.05
45°
6°
R 0.1 MAX
1.00 ± 0.07
0.7
0.46 ± 0.025
1.50
1.5
1.50
0.38 ± 0.01
3.00 ± 0.025
1.5
6°~2X
1
R 0.13~2X
R 0.13~2X
Unit: mm
6°~2X
TO-92 PACKAGE OUTLINE DIMENSIONS
4.6 ± 0.1
3.6 ± 0.15
2°
2°
4.6 ± 0.1
2.3
2°
1.45 ± 0.1
2°
3 - 0.46
0.38 ± 0.015
1.27 1.27
Unit: mm
3.6 ± 0.15
1.3 ± 0.1
5°
5°
GM432
14.5 ± 0.5
11
A
A
MICROELECTRONICS
Power Management
GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
ORDERING NUMBER
GM 432 A T92 B
Shipping
B : ESD Bag
RL: Ammo Pack
R: Tape & Reel
T: Tube
Gamma Micro.
Circuit Type
GM432
Voltage Tolerance
A: 0.5%
B: 1.0%
C: 2.0%
12
(Tape)
Package
T92: TO-92
ST23: SOT-23
ST25: SOT-25
S8: SOP-8
A
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
GM432
A
MICROELECTRONICS
Power Management
GM432
13
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