SSC SS6431GZTB

SS6431G
Adjustable High-Precision Shunt Regulator
FEATURES
DESCRIPTION
Precision reference voltage.
The SS6431G is a three-terminal adjustable
SS6431G:
2.495V ±0.5%
Sink current capability of 200mA.
precision shunt regulator with guaranteed
Minimum cathode current for regulation of 250µA.
Equivalent full-range temperature coefficient of
50 ppm/°C.
Fast turn-on response.
Low dynamic output impedance of 80 milliohms.
Adjustable output voltage.
Low output noise.
Space saving packages: SOT-89, SOT-23, TO92 and SO-8.
Pb-free lead finish (second-level interconnect).
temperature stability over the applicable extended commercial temperature range. The
output voltage may be set at any level greater
than 2.495V (VREF) up to 30V merely by selecting two external resistors that act as a
voltage divider network.
This device has a
typical output impedance of 0.08Ω. Active
output circuitry provides a very sharp turn-on
characteristic, making this device an excellent
improved replacement for zener diodes in
APPLICATIONS
many applications.
Linear regulators.
Adjustable supplies.
Switching power supplies.
Battery operated computers.
Instrumentation.
Computer disk drives.
The precise ±0.5% reference voltage tolerance
of the SS6431G makes it possible in many
applications to avoid the use of a variable
resistor, consequently saving cost and
eliminating the drift and reliability problems
associated with it.
TYPICAL APPLICATION CIRCUIT
VIN
VOUT
+
R3
R1 +
C1
C2
SS6431G
R2
VOUT = (1+R1/R2) VREF
Precision Regulator
2/10/2005 Rev.2.10
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SS6431G
ORDERING INFORMATION
PIN CONFIGURATION
SS6431GXXXX
SO-8 (GS)
TOP VIEW
Packing type
TR: Tape and reel
TB: Tube (for SO-8)
Package type
S: Small outline
US: SOT-23
UN: SOT-23
X: SOT-89
Z: TO-92
CATHODE
1
8 REF
ANODE
2
7 ANODE
ANODE
3
6 ANODE
NC
4
5 NC
3
SOT-23 (GUN)
FRONT VIEW
1: CATHODE
2: VREF
3: ANODE
Example: SS6431GSTR
à in SO-8 package, with Pb-free
lead finish, shipped on tape and reel.
1
2
SOT-23 (GUS)
FRONT VIEW
1: VREF
2: CATHODE
3: ANODE
3
1
SOT-89 (GX)
FRONT VIEW
1: VREF
2: ANODE
3: CATHODE
TO-92 (GZ)
FRONT VIEW
1: VREF
2: ANODE
3: CATHODE
1
2
2
3
1
2
3
ABSOLUTE MAXIMUM RATINGS
Cathode Voltage ........……………...............……………..………...............................30V
Continuous Cathode Current ...................………….……...................... -10mA ~ 250mA
Reference Input Current Range .......…………........……..........…………………… 10mA
Operating Temperature Range, TA.......………….........….........……………. -40°C ~ 85°C
Lead Temperature.......…………..................………………..………………………. 260°C
Storage Temperature.......…………..................……………..…………….. -65°C ~ 150°C
Power Dissipation (Notes 1, 2)
SOT-89 Package .........…………...... 0.80W
TO-92 Package ….......…………....... 0.78W
Note 1: TJ, max = 150°C.
Note 2: Ratings apply to ambient temperature at 25°C.
2/10/2005 Rev.2.10
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SS6431G
TEST CIRCUITS
IN
IIN
IN
VZ
IIN
R1
IREF
VZ
SS6431G
IZ
IREF
IZ
VREF
R2
VREF
SS6431G
Z=VREF(1+R1/R2)+IREFxR1
Fig. 1 Test Circuit for VZ=VREF
Fig. 2 Test Circuit for VZ>VREF
IN
VZ
IZ(OFF)
SS6431G
Fig. 3 Test Circuit for off-state Current
ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
V REF
2.482
2.495
2.508
V
9.0
20
mV
9.0
50
VZ=VREF,
Reference Voltage
IIN =10mA (Fig.1)
Deviation of Reference
Input Voltage Over
Temperature (Note 3)
VZ = VREF , IIN =10mA,
TA = 0°C~ +70°C (Fig. 1)
VDEV
TA = -40°C~ +85°C (Fig. 1)
Ratio of the Change in Reference Voltage to the
Change in Cathode voltage
2/10/2005 Rev.2.10
IZ=10mA
∆VZ=10V-VREF
∆VREF
-0.5
-2.0
mV/V
(Fig. 2)
∆VZ=30V-10V
∆VZ
-0.35
-1.5
mV/V
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SS6431G
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
SYMBOL
TYP.
MAX.
UNIT
IREF
0.8
3.5
µA
R1 =10kΩ, R2=∞,
IIN =10mA
TA =-40°C ~ +85°C (Fig. 2)
αIREF
0.3
1.2
µA
Minimum Cathode current
for Regulation
VZ=VREF (Fig. 1)
IZ(MIN)
0.25
0.5
mA
Off-State Current
VZ=20V, VREF =0V (Fig. 3)
IZ(OFF)
0.1
1.0
µA
Dynamic Output Impedance
(Note 4)
VZ=VREF
F<1kHz (Fig. 1)
RZ
0.08
0.3
Ω
Reference Input Current
Deviation of Reference Input
Current over Temperature
TEST CONDITIONS
R1 =10kΩ, R2=∞,
IIN =10mA (Fig. 2)
MIN.
Where:
T2−T1=full temperature change.
αVREF can be positive or negative depending on
whether the slope is positive or negative.
Example: VDEV= 9.0mV, VREF= 2495mV,
T2−T1= 70°C, slope is negative.
VMAX
VDEV = VMAX-VMIN
VMIN
 9.0mV  106
 2495mV 
αVREF = 
= −50ppm/°C
70°C
T1
TEMPERATURE
T2
Note 3. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input
voltage over the full temperature range.
The average temperature coefficient of the reference input voltage, αVREF is defined as:

 6
 VMAX - VMIN  6
VDEV
±
±
10
10
VREF(at 25°C) 
VREF(at 25°C) 
ppm
= 
∆VREF
= 
T2 − T1
T2 − T1
°C
2/10/2005 Rev.2.10
Note 4. The dynamic output impedance, Rz, is defined as:
RZ =
∆VZ
∆IZ
When the device is programmed with two external resistors, R1 and R2, (see Fig. 2), the dynamic output
impedance of the overall circuit, is defined as:
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rz =
[ ]
∆V
≅ Rz 1+ R1
R2
∆I
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SS6431G
TYPICAL PERFORMANCE CHARACTERISTICS
1000
2.58
VZ =VREF
TA =25°C
IZ(MIN)
600
400
200
0
-200
-400
IZ =10mA
2.54
VREF=2.535V
2.52
2.50
VREF=2.495V
2.48
2.46
2.44
VREF=2.455V
2.42
-600
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
2.40
-40
3.0
Cathode Voltage (V)
Fig. 4 Cathode Current vs. Cathode Voltage
-20
0
20
40
60
80
100
120
Temperature (°C)
Fig. 5 Reference Voltage vs. Temperature
0.28
1.20
R1=10KΩ
R2=∞
IZ=10mA
1.15
1.10
Dynamic Impedance (Ω)
Reference Input Current (µA)
VZ =VREF
2.56
Reference Voltage (V)
Cathode Current (µA)
800
1.05
1.00
0.95
0.90
0.85
0.80
0.24
VZ=VREF
IZ=1mA to100mA
0.20
F <1KHz
0.16
0.12
0.08
0.04
0.75
0.70
-40
-20
0
20
40
60
80
100
120
0.00
-40
0
20
40
60
80
100
120
Temperature (°C)
Fig. 7 Dynamic Impedance vs. Temperature
Temperature (°C)
Fig. 6 Reference Input Current vs. Temperature
2.5
0
Off-State Cathode Current (µA)
Change in Reference Voltage (mV)
-20
-1
IZ =10mA
-2
TA =25°C
-3
-4
-5
-6
0
5
10
15
20
25
30
35
40
Cathode Voltage (V)
Fig. 8 Change in Reference Voltage vs. Cathode Voltage
2/10/2005 Rev.2.10
2.0
VREF=0V
VZ=30V
1.5
1.0
0.5
0.0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Fig. 9 Off-State Cathode Current vs. Temperature
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SS6431G
Small Signal Voltage Amplification (dB)
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
80
70
IZ =10mA
60
T A=25°C
47µF
50
40
Output
R1
10k
R2
250
Av
+
30
CIN
SS6431G
V1
VIN
20
10
0
-1010
100
1k
10k
100k
1M
10M
Frequency (Hz)
Fig. 10 Small Signal Voltage Amplification vs. Frequency
Fig. 11 Test Circuit For Frequency Response
RB
Input
OUTPUT
220
Pulse Gen.
f=100kHz
RA
50
SS6431G
Output
Fig. 13 Test Circuit For Pulse Response
Fig. 12 Pulse Response
100
Cathode Current (mA)
VZ
80
VZ=VREF
R
Stable
150
60
CL
40
SS6431G
VIN
Stable
20
0
1E-4
1E-3
0.01
0.1
1
10
Load Capacitance (µF)
Fig. 15 Test Circuit for Stability Boundary Conditions
Fig. 14 Stability Boundary Conditions
The areas between the curves represent conditions that
may cause the device to oscillate.
2/10/2005 Rev.2.10
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SS6431G
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
R1
Dynamic Impedance (Ω)
10
Output
Iz=10mA
50
TA=25°C
SS6431G
+
1
R2
AC
-
50
+
3V
GND
0.1
1K
10K
100K
1M
Frequency (Hz)
Fig. 16 Dynamic impedance vs. Frequency
SYMBOL
Fig. 17 Test Circuit for Dynamic Impedance
BLOCK DIAGRAM
CATHODE (C)
REF (R)
CATHODE (C)
+
-
REF (R)
SS6431G
2.495V
ANODE (A)
ANODE (A)
PIN DESCRIPTIONS
CATHODE Pin -
Sinks current with a range from 250µA to 200mA for normal applications.
VREF Pin
-
Providing VREF=2.495V (typ.) for adjustable output voltage.
ANODE Pin
-
Anode pin sources current for normal application. The current value is the same as Cathode pin.
2/10/2005 Rev.2.10
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SS6431G
APPLICATION EXAMPLES
VIN
VIN
R3
R1B
R4
R1A
R2A
SS6431G
SS6431G
R2B
R2
R1
R3
ON
+ SS6431G
C
OFF
LED Turns on when Low Limit<VIN< High Limit
l
Low Limit ≅ VREF (1+R1B/R2B)
Delay=R x C x n (
High Limit ≅ VREF (1+R1A/R2A)
Fig. 18 Voltage Monitor
VIN
)
VIN − VREF
Fig. 19 Delay Timer
VIN
IOUT
R1
RCL IOUT
VIN
SS6431G
RS
SS6431G
R1
VIN
IOUT=VREF/ RCL
IOUT=VREF /RS
Fig. 20 Current Limiter or Current Source
Fig. 21 Constant-Current Sink
RIN
VOUT
VIN
R3
FUSE
R3
VOUT
R1
R1
SS6431G
R2
SS6431G
R2
VOUT ≅ (1+R1/R2) x VREF
VLIMIT ≅ (1+R1/R2) x VREF
Fig 22 Higher-Current Shunt Regulator
2/10/2005 Rev.2.10
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Fig 23
Crow Bar
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SS6431G
APPLICATION EXAMPLES (Continued)
VIN
R1A
R3
R1B
C1
SS6431G
Output turns ON when
Low Limit <VIN < High Limit
+
SS6431G
R2A
R4
R2B
R5
VBE
Low Limit≅ VREF ( 1+ R1B/ R2B )+ VBE
High Limit ≅ VREF ( 1+ R1A/ R2A )
Fig 24 Over-Voltage/Under-Voltage Protection Circuit
PHYSICAL DIMENSIONS
This device is shipped with Pb-free lead finish (second-level interconnect).
8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
H
E
e
e
A
A1
C
B
2/10/2005 Rev.2.10
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
L
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SS6431G
SOT-23 (unit: mm)
C
D
SYMBOL
MIN
MAX
A
1.00
1.30
A1
—
0.10
A2
0.70
0.90
b
0.35
0.50
C
0.10
0.25
D
2.70
3.10
E
1.40
1.80
L
E
H
θ1
e
A
A2
e
A1
b
1.90 (TYP)
H
2.60
3.00
L
0.37
—
1
1°
9°
SOT-23 MARKING
Part No.
SS6431GUN
Marking
AC1NP
Part No.
SS6431GUS
Marking
AC1SP
SOT-89 (unit: mm)
A
D
D1
C
H
E
L
B
e
e1
SYMBOL
MIN
MAX
A
1.40
1.60
B
0.36
0.48
C
0.35
0.44
D
4.40
4.60
D1
1.62
1.83
E
2.29
2.60
e
1.50 (TYP.)
e1
3.00 (TYP.)
H
3.94
4.25
L
0.89
1.20
SOT-89 MARKING
Part No.
SS6431GX
2/10/2005 Rev.2.10
Marking
AC1BP
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SS6431G
TO-92 (unit: mm)
A
E
L
C
SYMBOL
MIN
MAX
A
4.32
5.33
C
e1
D
0.38 (TYP.)
D
4.40
5.20
E
3.17
4.20
e1
L
1.27 (TYP.)
12.7
-
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guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no
responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its
use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including
without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to
the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of
Silicon Standard Corporation or any third parties.
2/10/2005 Rev.2.10
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