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SS6431G Adjustable High-Precision Shunt Regulator
FEATURES
Precision reference voltage. SS6431G: 2.495V 0.5% Sink current capability of 200mA. Minimum cathode current for regulation of 250A. 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.
DESCRIPTION
The SS6431G is a three-terminal adjustable precision shunt regulator with guaranteed 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 0.08. Active output circuitry provides a very sharp turn-on characteristic, making this device an excellent improved replacement for zener diodes in many applications. 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.
Pb-free lead finish (second-level interconnect).
APPLICATIONS
Linear regulators. Adjustable supplies. Switching power supplies. Battery operated computers. Instrumentation. Computer disk drives.
TYPICAL APPLICATION CIRCUIT
VIN + C1
SS6431G
VOUT R3 R1 + C2
R2
VOUT = (1+R1/R2) VREF
Precision Regulator
2/10/2005 Rev.2.10
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SS6431G
ORDERING INFORMATION
SS6431GXXXX 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 Example: SS6431GSTR a in SO-8 package, with Pb-free lead finish, shipped on tape and reel.
PIN CONFIGURATION
SO-8 (GS) TOP VIEW
CATHODE ANODE ANODE NC 1 2 3 4 8 REF 7 ANODE 6 ANODE 5 NC
SOT-23 (GUN) FRONT VIEW 1: CATHODE 2: VREF 3: ANODE SOT-23 (GUS) FRONT VIEW 1: VREF 2: CATHODE 3: ANODE
3
1 3
2
1
2
SOT-89 (GX) FRONT VIEW 1: VREF 2: ANODE 3: CATHODE TO-92 (GZ) FRONT VIEW 1: VREF 2: ANODE 3: CATHODE
1
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........................................................ -40C ~ 85C Lead Temperature..................................................................................... 260C Storage Temperature....................................................................... -65C ~ 150C Power Dissipation (Notes 1, 2) SOT-89 Package ........................... 0.80W
TO-92 Package ............................. 0.78W Note 1: TJ, max = 150C. Note 2: Ratings apply to ambient temperature at 25C.
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SS6431G
TEST CIRCUITS
IN
IN IIN
R1 IREF
IIN VZ
SS6431G
VZ IREF IZ VREF
SS6431G
IZ R2 VREF
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=25C, unless otherwise specified.)
PARAMETER Reference Voltage TEST CONDITIONS VZ=VREF, IIN =10mA (Fig.1) VZ = VREF , IIN =10mA, TA = 0C~ +70C (Fig. 1) TA = -40C~ +85C (Fig. 1) Ratio of the Change in Reference Voltage to the Change in Cathode voltage IZ=10mA (Fig. 2) VZ=10V-VREF VZ=30V-10V VREF VZ VDEV 9.0 9.0 -0.5 -0.35 20 50 -2.0 -1.5 mV/V mV/V mV V REF 2.482 2.495 2.508 V
SYMBOL
MIN.
TYP.
MAX.
UNIT
Deviation of Reference Input Voltage Over Temperature (Note 3)
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SS6431G
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER Reference Input Current Deviation of Reference Input Current over Temperature TEST CONDITIONS R1 =10k, R2=, IIN =10mA (Fig. 2) R1 =10k, R2=, IIN =10mA TA =-40C ~ +85C (Fig. 2) VZ=VREF (Fig. 1) VZ=20V, VREF =0V (Fig. 3) VZ=VREF F<1kHz (Fig. 1)
SYMBOL
MIN.
TYP. 0.8
MAX. 3.5
UNIT A
IREF
IREF IZ(MIN) IZ(OFF) RZ
0.3 0.25 0.1 0.08
1.2 0.5 1.0 0.3
A mA A
Minimum Cathode current for Regulation Off-State Current Dynamic Output Impedance (Note 4)
VMAX
VDEV = VMAX-VMIN VMIN
Where: T2-T1=full temperature change. VREF can be positive or negative depending on whether the slope is positive or negative. Example: VDEV= 9.0mV, VREF= 2495mV, T2-T1= 70C, slope is negative.
9.0mV 106 2495mV VREF = = -50ppm/C
70C
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, VREF is defined as:
Note 4. The dynamic output impedance, Rz, is defined as: RZ =
VZ IZ
6 VMAX - VMIN 6 VDEV 10 10 VREF(at 25C) VREF(at 25C) ppm = VREF = T2 - T1 T2 - T1 C
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:
rz =
V Rz 1+ R1 R2 I
[]
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SS6431G
TYPICAL PERFORMANCE CHARACTERISTICS
1000 800 600 400 200 0 -200 -400 -600 -1.0 2.58
Reference Voltage (V)
VZ =VREF TA =25C
2.56
VZ =VREF IZ =10mA VREF=2.535V
IZ(MIN)
Cathode Current (A)
2.54 2.52 2.50 2.48 2.46 2.44 2.42
VREF=2.495V
VREF=2.455V
-20 0 20 40 60 80 100 120
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
2.40 -40
Cathode Voltage (V) Fig. 4 Cathode Current vs. Cathode Voltage
Temperature (C) Fig. 5 Reference Voltage vs. Temperature
1.20
0.28
Reference Input Current (A)
1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.75 0.70 -40
Dynamic Impedance ()
R1=10K R2= IZ=10mA
0.24
VZ=VREF IZ=1mA to100mA F <1KHz
0.20
0.16
0.12
0.08
0.04
-20
0
20
40
60
80
100
120
0.00 -40
-20
0
20
40
60
80
100
120
Temperature (C) Fig. 6 Reference Input Current vs. Temperature
Temperature (C) Fig. 7 Dynamic Impedance vs. Temperature
Change in Reference Voltage (mV)
0
2.5
-1
Off-State Cathode Current (A)
2.0
IZ =10mA
-2
VREF=0V
1.5
TA =25C
VZ=30V
-3
1.0
-4
-5
0.5
-6 0 5 10 15 20 25 30 35 40
0.0 -40
-20
0
20
40
60
80
100
120
Cathode Voltage (V) Fig. 8 Change in Reference Voltage vs. Cathode Voltage
Temperature (C) Fig. 9 Off-State Cathode Current vs. Temperature
2/10/2005 Rev.2.10
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SS6431G
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Small Signal Voltage Amplification (dB)
80 70 60 50 40 30 20 10 0
-10 10
IZ =10mA TA=25C
47F
Av
R1 10k
Output R2 250
+ VIN
CIN
SS6431G
V1
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
Pulse Gen. f=100kHz
220 RA 50
OUTPUT
SS6431G
Output
Fig. 12 Pulse Response
Fig. 13 Test Circuit For Pulse Response
100
VZ
Cathode Current (mA)
80
VZ=VREF
60
Stable
CL
R 150 SS6431G VIN
40
Stable
20
0 1E-4
1E-3
0.01
0.1
1
10
Load Capacitance (F)
Fig. 14 Stability Boundary Conditions
Fig. 15 Test Circuit for Stability Boundary Conditions
The areas between the curves represent conditions that may cause the device to oscillate.
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SS6431G
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
10
R1
Iz=10mA TA=25C
Output 50 SS6431G +
Dynamic Impedance ()
1
AC
R2 50
+ 3V
0.1
GND
10K 100K 1M
1K
Frequency (Hz)
Fig. 16 Dynamic impedance vs. Frequency
Fig. 17 Test Circuit for Dynamic Impedance
SYMBOL
CATHODE (C)
BLOCK DIAGRAM
REF (R) +
-
REF (R) SS6431G
2.495V
ANODE (A)
ANODE (A)
PIN DESCRIPTIONS
CATHODE Pin VREF Pin ANODE Pin Sinks current with a range from 250A to 200mA for normal applications. Providing VREF=2.495V (typ.) for adjustable output voltage. 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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CATHODE (C)
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SS6431G
APPLICATION EXAMPLES
VIN
VIN
R3 R1B R4
R2 R1 R3
R1A
R2A
SS6431G
SS6431G R2B
OFF
ON
+ SS6431G C
LED Turns on when Low Limitln ( V VV -
IN IN
)
REF
Fig. 19 Delay Timer
VIN R1 IOUT
RCL IOUT VIN
SS6431G
SS6431G R1
RS
IOUT=VREF/ RCL Fig. 20 Current Limiter or Current Source
IOUT=VREF /RS Fig. 21 Constant-Current Sink
VIN
RIN R3 R1
VOUT
VIN
FUSE R1
R3
VOUT
SS6431G
R2
SS6431G
R2
VOUT (1+R1/R2) x VREF Fig 22 Higher-Current Shunt Regulator
VLIMIT (1+R1/R2) x VREF Fig 23 Crow Bar
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SS6431G
APPLICATION EXAMPLES (Continued)
VIN R1A R1B R3 SS6431G Output turns ON when Low Limit C1 SS6431G R2A R2B
+
R4
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 A A1
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40
MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27
B C D E
e A C A1
e H L
L
1.27(TYP)
B
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SS6431G
SOT-23 (unit: mm)
D C L E H
SYMBOL A A1 A2 b
1
MIN 1.00 -- 0.70 0.35 0.10 2.70 1.40 2.60 0.37 1
MAX 1.30 0.10 0.90 0.50 0.25 3.10 1.80 3.00 -- 9
e
C D E
A2
A A1 b
e H L 1
1.90 (TYP)
SOT-23 MARKING
Part No. SS6431GUN Marking AC1NP Part No. SS6431GUS Marking AC1SP
SOT-89 (unit: mm)
D D1 C A
SYMBOL A B C D
MIN 1.40 0.36 0.35 4.40 1.62 2.29
MAX 1.60 0.48 0.44 4.60 1.83 2.60 1.50 (TYP.) 3.00 (TYP.)
H E
D1 E e
L e e1 B
e1 H L 3.94 0.89
4.25 1.20
SOT-89 MARKING
Part No. SS6431GX Marking AC1BP
2/10/2005 Rev.2.10
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SS6431G
TO-92 (unit: mm)
L C E
SYMBOL A C
MIN 4.32
MAX 5.33 0.38 (TYP.)
A
e1 D
D E e1 L
4.40 3.17 1.27 (TYP.) 12.7
5.20 4.20
-
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no 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.
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