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(R)
SPX1432
1.24V Precision Adjustable Shunt Regulator
FEATURES
Reference Voltage: 1.24V Initial Accuracy: 0.5% Wide Operating Current, 60A to 100mA Ultra Low Reference Input Current, 100nA Operating Voltage Range: VREF to 20V 0C to 105C Guaranteed Operation SOT-23-3 Package Upgrade to LMV431, TLV431, SC431L
ANODE
3
3
SPX1432
1
1
2
2
REF
CATHODE
Now Available in Lead Free Packaging

APPLICATIONS
Switching Power Supplies Adjustable Supplies Error Amplifiers
Single Supply Amplifier Monitors / VCRs / TVs Personal Computers Voltage References
DESCRIPTION
The SPX1432 is a three terminal adjustable shunt voltage regulator that provides a highly accurate 1.24V bandgap reference with 0.5% accuracy, eliminating the need for trimming in most power supply designs. Offered in the tiny SOT-23 package, the SPX1432 has an extremely wide operating current range of 60uA to 100mA, and reference input current of only 100nA (typ). The SPX1432 can regulate outputs from VREF to 20V, using two external resistors, and is guaranteed over the extended commercial temperature range of 0C to 105C. The combination of the small size, wide output current capability, flexible voltage range, and stable performance over the entire extended commercial temperature range, makes the SPX1432 the ideal candidate a variety of shunt regulator and current source designs in applications such as Portable meters, Instrumentation, and Industrial Process Control.
FUNCTIONAL DIAGRAM
Cathode (K)
Reference (R)
+ 1.24V
Anode (A)
Date: 5/6/04
SPX1432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Cathode-Anode Reverse Breakdown VKZ ....................................... 22V Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A Operating Cathode Current IKA .................................................. 120mA Reference Input Current IREF .......................................................... 1mA Continuos Power Dissipation at 25C PD SOT-23 .................................................................. 200 mW Junction Temperature TJ ........................................................... 150 C Storage Temperature TSTG .............................................. -65 to 150 C Lead Temperature (Soldering 10 sec.) TL .................................. 300C
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
RECOMMENDED CONDITIONS
PARAMETER Cathode Voltage Cathode Current SYMBOL VKA IK RATING VREF to 20 10 UNIT V mA
TYPICAL THERMAL RESISTANCES
PACKAGE SOT-23 JA JC TYPICAL DERATING 1.7 mW/C
575C/W 150C/W
Typical deratings of the thermal resistances are given for ambient temperature >25.
ELECTRICAL CHARACTERISTICS
Electrical characteristics are guaranted over the full junction temperature range (0C to 105C). Ambient temperature must be derated based upon power dissipation and package thermal characteristics. Unless otherwise specified, test conditions are: VKA = VREF and IK = 10mA.
PARAMETER Accuracy 0.5% Output Voltage Temperature Deviation Line Regulation Load Regulation Reference Input Current Reference Input Current Temperature Coefficient Minimim Cathode Current for Regulation Off State Leakage VREF VREF VREF VREF IREF IREF IK(MIN) IK(MIN) 2 2 3 2 3 3 2 4 TJ = 25C 0 < TJ < 105C VKA = 1.25V to 15V IK = 100A to 100mA TJ = 25C, R1 = 10K, R2 = 0 < TJ < 105C, R1 = 10K, R2 = TJ = 25C VREF = 0V, VKA = 18V, TJ = 25C 1.234 SYMBOL FIGURE CONDITIONS MIN TYP SPX1432A 1.240 6 15 10 0.1 0.05 60 0.01 1.246 12 37 30 0.3 0.2 80 500 V mV mV mV A A A nA MAX UNITS
PARAMETER Accuracy 1.0% Output Voltage Temperature Deviation Line Regulation Load Regulation Reference Input Current Reference Input Current Temperature Coefficient Minimim Cathode Current for Regulation Off State Leakage
SYMBOL
FIGURE CONDITIONS
MIN
TYP SPX1432
MAX
UNITS
VREF VREF VREF VREF IREF IREF IK(MIN) IK(MIN)
2 2 3 2 3 3 2 4
TJ = 25C 0 < TJ < 105C VKA = 1.25V to 15V IK = 100A to 100mA TJ = 25C, R1 = 10K, R2 = 0 < TJ < 105C, R1 = 10K, R2 = TJ = 25C VREF = 0V, VKA = 18V, TJ = 25C
1.228
1.240 9 15 10 0.1 0.05 60 0.01
1.252 18 37 30 0.5 0.4 100 500
V mV mV mV A A A nA
Date: 5/6/04
SPX1432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
2
CALCULATION AVERAGE TEMPERATURE COEFICIENT (TC)
ppm 0 % 0 mV 0 VREF T -5 5000 0.5
* TC in mV / C =
VREF(mV) TA
* TC in % / C =
(V
VREF
at 25C)
x 100
REF
TA
0
15
30
45
60
75
90
105
* TC in ppm / C =
(V
VREF
at 25C)
x 106
REF
TA
Junction Temperature (C)
0.0033mV /C 0.0027% / C 27ppm/C
Figure 1. VREF VS Temperature.
TEST CIRCUITS
VIN VKA = VREF
VIN VKA
VIN
VKA
IK (OFF) IREF IK
R1 IREF (VREF) R2 IK
Figure 2. Test Circuit for VKA = VREF
Figure 3. Test Circuit for VKA > VREF
Figure 4. Test Circuit for IKOFF
TYPICAL PERFORMANCE CHARACTERISTICS
15.0
IREF-Reference Input Current (nA)
200
12.5 10.0
IK Cathode Current (mA)
VKA = VREF 25C
160
7.5 5.0 2.5 0 -2.5 -5.0 -7.5 -10.0 -2 1.24 -1 0 1 2 3 VKA Cathode Voltage (V)
120
80
40
0 -60 -40 -20 0 20 40 60 80 100 120 TA-Ambient Temperature (C)
High Current Operating Characteristics.
Date: 5/6/04
Reference Input Current VS Ambient Temperature.
(c) Copyright 2004 Sipex Corporation
SPX1432 1.24V Precision Adjustable Shunt Regulator
3
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
1.25
VREF-Reference Voltage (V)
1.25
1.24 1.235 1.23 1.225 1.22 -60
VKA--Cathode Voltage (V) -30 0 30 60 90 120
1.245
1.245
1.24
1.235 0.01
TA-Ambient Temperature (C)
0.1 1 10 Ik--cathode Current (mA)
100
Reference Voltage VS Ambient Temperature.
Reference Voltage Load Regulation.
0
1000.0000
Ikoff Cathode Current (nA)
-10 DVREF(mV)
100.0000 10.0000 1.0000 0.1000 0.0100 0.0010 0.0001
-20
-30
-40 0
-50
0
50
100
150
3
6
9
12
15
18
21
Ta Ambient Temperature (C)
VKA-Cathode Voltage (V)
Reference Voltage Line Regulation.
Off State Leakage VS Ambient Temperature.
VIN
R IK
VOUT
Ch1-VIN
fP = 100kHz
50
Ch2-VKA
GND
Test Circuit for Pulse Response.
IKA = 0 to 100A.
Date: 5/6/04
SPX1432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS: Continued
IKA = 0 to 300A.
IKA = 0 to 1mA.
IKA = 0 to 10mA.
IKA = 0 to 50mA.
IKA = 0 to 80mA
Date: 5/6/04
IKA = 0 to 100mA
SPX1432 1.24V Precision Adjustable Shunt Regulator (c) Copyright 2004 Sipex Corporation
5
PACKAGE: 3 PIN SOT23
D
b 3
B B
E1 E
SEE VIEW C
1 e
2
e1
L L1
Gauge Plane
L2
VIEW C
3 PIN SOT-23 JEDEC TO-236 (AB) Variation A A1 A2 b c D e e1 E E1 L L1 O 0 2.10 1.20 0.30 Dimensions in (mm)
A
MIN 0.89 0.01 0.88 0.30 0.08 2.80
NOM MAX .95 2.90 1.12 0.10 1.02 0.50 0.20 3.04
A
A1 A A2
Seating Plane
C
SIDE VIEW
b
WITH PLATING
0.95 BSC 1.90 BSC 1.30 0.45 0.54 REF 2.64 1.40 0.60
c
BASE METAL
8
3 PIN SOT-23
Date: 5/6/04
SPX1432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
6
ORDERING INFORMATION PART NUMBER ACC OUTPUT VOLTAGE TOP MARK SPX1432AM ............ 0.5% .................. 1.24V .......................... W1 ............ SPX1432AM/TR ...... 0.5% .................. 1.24V .......................... W1 ............ SPX1432M ............... 1.0% .................. 1.24V ........................... F2 ............ SPX1432M/TR ......... 1.0% .................. 1.24V ........................... F2 ............
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX1432AM/TR = standard; SPX1432AM-L/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for SOT-23.
PACKAGES 3-Pin SOT-23 3-Pin SOT-23 3-Pin SOT-23 3-Pin SOT-23
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Date: 5/6/04
SPX1432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
7

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