View B3431_1018413.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Bay Linear
Inspire the Linear Power
Adjustable Shunt Regulator
B3431
Description
The Bay Linear B3431 is a three terminal adjustable shunt regulator with thermal stability over Temperature range. Using two external resistors allows the output voltage to be adjusted from 2.5V to 36V. With a sharp turn on characteristics the B3431 a superior replacement for zener diode applications.
Features
* * * * * Wide Operating Range ...1mA to100mA Tight Band Gap Tolerance ...........0.5% Low Temp. Coefficient............30 ppm/oC Wide temp range of -40 to +105oC Available in SOT-23 package
.
The B3431 shunt regulator has a tolerance of 0.5% which has proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufacturers assembly line and contribute a significant cost savings.
Applications
* * * * * * Switching Power Supplies Adjustable Power Supplies Linear Regulators Battery Powered Equipment Monitors, TV, VCR Instrumentation
Package Information
SOT-23-3 (K3) LM3431 SOT-23-3 (K3) B3431
Ordering & Marking Information
ANODE
3 1 2
ANODE
3 1 2
Package
SOT-23 0.5% B3431AK3
Tolerance
1% B3431BK3 2% B3431CK3
CATHODE REF
Top View
REF CATHODE
Top View
CATHODE (K)
REFERENCE (R)
+
2.5V
ANODE (A)
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3431
Absolute Max Ratings
Parameter Cathode Voltage Continuous Cathode Current Reference Input Current Power Dissipation at TA - 25C S0-8 TO-92 SOT-23-3 Thermal Resistance SOT-23-3 S0-8 TO-92 Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 seconds ESD Rating (Human Body Model) Symbol Vz Iz IREF PD Maximum 37 150 10 750 775 200 575 175 160 -40 to +150 -65 to +150 300 2 Units V mA mA mW
OJA TJ TSTG TLEAD TESD
C/W C C C kV
Recommended Operating Conditions
Cathode Voltage, Vz Cathode Current, Iz Min VREF 0.1 Max 36 150 Symbol V mA
Electrical Characteristics
Unless specified: T = 25C. Values in bold apply over full operating ambient temperature. B3431 0.5% Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF To Change in VZ Reference Input Current IREF Temperature Deviation Off-State Cathode Current Dynamic Output Impedance Minimum Operating Current Symbol VREF VDEV VREF VZ IREF IREF(DEV) IZ (OFF) rz IZ(MIN) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,VZ = 10V to VRef IZ = 10mA,VZ = 36V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =36V(3) F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) VZ = VREF(1) Min 2.490 -2.7 -2.0 Typ 2.50 4 -1.0 -0.4 0.7 0.4 0.1 0.20 0.4 Max 2.515 17 0.3 4 1.2 1 0.50 1 Units V mV mV/V A A A mA
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3431
B3431 1% Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF To Change in VZ Reference Input Current IREF Temperature Deviation Off-State Cathode Current Dynamic Output Impedance Minimum Operating Current Symbol VREF VDEV VREF VZ IREF IREF(DEV) IZ (OFF) rz IZ(MIN) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,VZ = 10V to VRef IZ = 10mA,VZ = 36V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =36V(3) F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) VZ = VREF(1) Min 2.474 -2.7 -2.0 Typ 2.50 4 -1.0 -0.4 0.7 0.4 0.1 0.20 0.4 Max 2.526 17 0.3 4 1.2 1 0.50 1 Units V mV mV/V A A A mA
B3431 2% Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF To Change in VZ Reference Input Current IREF Temperature Deviation Off-State Cathode Current Dynamic Output Impedance Minimum Operating Current Symbol VREF VDEV VREF VZ IREF IREF(DEV) IZ (OFF) rz IZ(MIN) Condition VZ = VREF1 IZ = 10mA(1) VZ = VREF1 IZ = 10mA(1) IZ = 10mA,VZ = 10V to VRef IZ = 10mA,VZ = 36V to 10V R1 = 10k, R2 = , IZ = 10mA(2) R1 = 10k, R2 = , IZ = 10mA(2) VREF = 0V, VZ =36V(3) F <1kHz, VZ = VREF IZ = 1mA to 100mA(1) VZ = VREF(1) Min 2.445 -2.7 -2.0 Typ 2.495 4 -1.0 -0.4 0.7 0.4 0.1 0.20 0.4 Max 2.545 17 0.3 4 1.2 1 0.50 1 Units V mV mV/V A A A mA
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3431
Calculating Average Temperature Coefficient (TC)
ppm
%
mV
0
0
0
TC in mV/C =
VREF (mV) TA VREF VREF at 25C TA VREF VREF at 25C TA
-10 5000 0.5
TC in %/C =
-20
-55
-25
0
25
50
75
100 125
TC in ppm/C =
Temperature (C) 0.06 mV/C 0.002 %/C 24 ppm/C
Test Circuit
VIN
VKA = VREF
VIN
VKA
VIN
IREF
IK
R1 (VREF) R2
IK
Figure 1a. Test Circuit 1
Figure 1b. Test Circuit 2
Figure 1c. Test Circuit 3
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
)
)
VREF
) )
x 100
x 106
VKA
IK (OFF)
www.baylinear.com
B3431
TYPICAL PERFORMANCE CURVES
Low Current Operating Characteristics
900 800 700 600 VKA = VREF Temperature Range: - 0 to 105 C 150 125 100 75 50 25 0 -25 -50 -75 -100 -1.0 0 1.0 2.0 3.0 -2
High Current Operating Characteristics
VKA = V REF Temperature Range: - 0 to 105 C
IK - Cathode Current (A)
500 400 300 200 100 0 -100 -200 105 C 25 C -0C
IK - Cathode Current (mA)
-1
0
1
2
3
VKA - Cathode Voltage (V)
VKA - Cathode Voltage (V)
Figure 2 Off State Leakage
100 2.53
Figure 3
Reference Voltage vs. Ambient Temperature
V KA = V REF IK = 10 mA
V KA = 18V V REF = 0V IZ off - Off State Cathode Current (nA)
10
2.52
VREF - Reference Voltage (V)
2.51
2.50
1
V REF = 2.500 V at 25 C
2.49
2.48
0.1
2.47
2.46
0.01 -60 -30 0 30 60 90 120
2.45 -60 -30 0 30 60 90 120
TA - Ambient Temperature ( C)
Figure 4
TA - Ambient Temperature ( C)
Figure 5
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3431
TYPICAL PERFORMANCE CURVES
Reference Input Current
3.0
0
Reference Voltage Line Regulation
( IREF - Reference Input CurrentA)
2.5
VREF - Change in Reference Voltage (mV)
R1 = 10 k R2 = IK = 10 mA
-10
2.0
-20
0 C 25 C 75 C 105 C
1.5
-30
1.0
-40
0.5
-50 0 -60 -30 0 30 60 90 120 0 3 6 9 12 15 18
TA - Ambient Temperature ( C) Figure 6 Noise Voltage
70 0.150
VKA - Cathode Voltage (V) Figure 7 Low Frequency Dynamic Output Impedance
VKA = VREF IKA = 1 to 100 mA f < 1 kHz
60
0.125
50
ZKA - Dynamic Impedance ( )
V KA = V REF IK = 10 mA TA = 25C
10 100 1k 10 k 100 k
Noise Voltage nV/ Hz
0.100
40
0.075
30
0.050
20
0.025 10
0.0 -60 -30 0 30 60 90 120
0
f - Frequency (Hz) Figure 8
TA - Free Air Temperature Figure 9
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3431
TYPICAL PERFORMANCE CURVES
Dynamic Output Impedance
100
TA = 25 C IK = 1 to 100 mA
ZKA - Dynamic Impedance
10
1.0
0.1
0.01 1k 10 k 100 k 1M 10 M
f - Frequency (Hz) Figure 10
Small Signal Voltage Gain vs. Frequency
70
Temperature Range: -0 to 105 C
60
AV - Small Signal Voltage Gain (dB)
IK = 10 mA
50
OUT
40
15 k 9 F
30
IK
230
20
8.25 k GND
10
0 1k 10 k 100 k 1M 10 M
f - Frequency (Hz)
Figure 11
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3431
TYPICAL PERFORMANCE CURVES
Pulse Response
6
5
INPUT
INPUT MONITOR
220 OUT
Input and Output Voltages (V)
4
3
OUTPUT
2
50 fP = 100 kHz
1
GND
0
-1 0 1 2 3 4 5 6 7 8 9 10 11 12
t - Time (s) Figure 12 Stability Boundary Conditions
100
90
A: B: C: D:
V KA = V REF V KA = 5V at I K = 10 mA V KA = 10V at I K = 10 mA V KA = 15V at I K = 10 mA
80
70
C 150 IK
IK - Cathode Current (mA)
60
50
40
STABILITY REGION
30
CL A
20
10 k
10
TA = 25 C
B D
0 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7
CL - Load Capacitance (pF) Figure 13
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B3431
Packaging Information SOT-23
0.015 - 0.018 (0.381 - 0.457)
0.047 - 0.055 0.083 - 0.098 (1.194 - 1.397) (2.108 - 2.489)
0.035 - 0.040 (0.889 - 1.016) 0.020 - 0.024 (0.508 - 0.610) 0.070 - 0.080 (1.778 - 2.032)
0.110 - 0.120 (2.794 - 3.048)
0.003 - 0.005 (0.076 - 0.127)
0.001 - 0.004 (0.025 - 0.102)
0.030 - 0.041 (0.762 - 1.041)
0.018 - 0.024 (0.457 - 0.610)
Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations, computer simulations and/ or initial prototype evaluation. Preliminary Information- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.
The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different applications. Customer's technical experts must validate all operating parameters including " Typical" for each customer application.
LIFE SUPPORT AND NUCLEAR POLICY
Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without the specific written consent of Bay Linear President.
Bay Linear, Inc 2478Armstrong St., Livermore CA USA 9550
Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

▲Up To Search▲

Price & Availability of B3431

	To Download B3431 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .