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(R)
SPX432
1.24V Precision Adjustable Shunt Regulator
FEATURES Low Voltage Operation, 1.24V Trimmed Bandgap to 0.5% and 1% Wide Operating Current, 1mA to 80mA Adjustable Output Voltage, VREF to 18V Extended Temp.Range: 0C to 105C Low Temperature Coefficient, 50 ppm/C Offered in TO-92, SOIC, SOT-23-3 Replacement for TLV431, AS432 APPLICATIONS Switching Power Supplies Adjustable Supplies Error Amplifiers
Anode 3
SPX432
3 Pin SOT-23
1 Ref 2 Cathode
Now Available in Lead Free Packaging
Refer to page 11 for other pinouts. Single Supply Amplifier Monitors / VCRs / TVs Personal Computers Voltage References
DESCRIPTION The SPX432 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate 1.24V bandgap reference with 0.5% tolerance. The SPX432's thermal stability, wide operating current (80mA) and temperature range (0C to 105C) makes it suitable for a variety of applications. SPX432 tolerance of 0.5% is 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 manufactures' assembly lines and contribute a significant cost savings. The SPX432 is an ideal voltage reference in an isolated feedback circuit for switch mode power supplies. SPX432 offers many advantages over the TLV431 such as wider output voltage (18V vs. 6V), higher output current (80mA vs. 15mA) and a wider operating temperature range with a tighter tolerance down to 0.5%. BLOCK DIAGRAM
Cathode (K)
Reference (R)
+ 1.24V
Anode (A)
Date: 12/11/04 SPX432 1.24V Precision Adjustable Shunt Regulator (c) Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Cathode-Anode Reverse Breakdown VKA ....................................... 20V Anode-Cathode Forward Current, (<10ms) IAK ................................. 1A Operating Cathode Current IKA .................................................... 80mA Reference Input Current IREF .......................................................... 1mA
Continuous Power Dissipation at 25C PD TO-92 ..................................................................... 775mW SOT-23 .................................................................. 200 mW SOIC-8 .................................................................... 750mW Junction Temperature TJ ........................................................... 150 C Storage Temperature TSTG .......................................... -65C 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 18 10 UNIT V mA
TYPICAL THERMAL RESISTANCES
PACKAGE TO-92 SOT-23 SOIC-8 0JA 160C/W 175C/W 0JC 80C/W 45C/W TYPICAL DERATING 6.3mW/C 1.7 mW/C 5.7mW/C
575C/W 150C/W
Typical deratings of the thermal resistances are given for ambient temperature >25C.
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 SYMBOL TEST CIRCUIT SPX432A 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) 3a 3a 3b 3a 3b 3b 3a 3c VREF = 0V, VKA = 18V 0 < TJ < 105C, 0 < TJ < 105C VKA = 1.25V to 15V IK = 1mA to 80mA 1.2338 1.240 12 19 12 3 0.3 0.6 0.04 1.2462 20 37 30 6 0.6 1 500 1.2276 SPX432 1.240 12 19 12 3 0.3 0.6 0.04 1.2524 20 37 30 6 0.6 1 500 V mV mV mV A A mA nA CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Date: 12/11/04
SPX432 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
* TC in mV / C =
VREF(mV) TA
* TC in % / C =
(V
VREF
at 25C)
x 100
REF
5000
0.5
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
Date: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
15.0 12.5 10.0
IK Cathode Current (mA)
VKA = VREF 0C to 105C
900 800 700 600 = VKA = VREF Temperature Range: 0C to 105C
5.0 2.5 0 -2.5 -5.0 -7.5 -10.0 -2 -1 0 1 2 VKA Cathode Voltage (V) 3
IK - Cathode Current (A)
7.5
500 400 105 C 300 25 C 200 -0 C 100 0 -100 -200 -1.0 -0.5 0 0.25 0.5 0.75 1.0 1.25 1.5 1.24
VKA - Cathode Voltage (V)
High Current Operating Characteristics.
Low Current Operating Characteristics.
VREF-Reference Voltage (V)
1.245 1.24 1.235 1.23 1.225 1.22 -60 -30 0 30 60 90 120 TA-Ambient Temperature (C)
IREF-Reference Input Current (uA)
1.25
3 2.5 2 1.5 1 0.5 0 -60 -30 0 30 60 90 TA-Ambient Temperature (C)
VKA = VREF, IKA = 10mA.
Reference Input Current VS Temperature; IKA= 10mA.
1.25
VKA--Cathode Voltage (V)
0 -10
1.245
dVREF(mV) -20 -30 -40 -50
1.24
1.235 0.01
0.1
1
IK--cathode Current (mA)
10
100
0
3
6
9
12
15
18
21
VKA-Cathode Voltage (V)
VKA = VREF, Sweeping IKA, 25C.
Reference Voltage Line Regulation; IKA = 10mA, Sweeping VKA, 25C.
Date: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS
1000.0000 100.0000
70 Noise Voltage nV/Hz 60 50 40 30 20 10 0 10 VKA = VREF IK = 10mA TA = 25C 100 1K 10K 100K
IKOFF Cathode Current (nA)
10.0000 1.0000 0.1000 0.0100 0.0010 0.0001 -50 0 50 100 150 TA Ambient Temperature (C)
f Frequency (Hz)
Off State Leakage; VKA = 18V, VREF = 0V.
Noise Voltage VS Frequency.
100
0.150
ZKA Dynamic Impedance ()
0.125 0.100 0.075 0.050 0.025 0.0 -60
ZKA - Dynamic Impedance ()
VKA = VREF IK = 1 to 80mA f1kHz
TA = 25 C IK = 1 to 80 mA
10
1.0
0.1
0.01 1k 10 k 100 k 1M 10 M
-30
0
30
60
90
120
TA Free Air Temperature
f - Frequency (Hz)
Low Frequency Dinamic Output Impedance VS TAMBIENT.
Dynamic Output Impedance TA= 25C, IKA = 1 to 80mA.
REF LEVEL 0.0deg 70.000dB 70dB 60dB
/DIV 45.000deg 10.000dB
MARKER 735 PHASE (A/R) MARKER 735 MAG (A/R)
074.781Hz 87.012deg 074.781Hz 0.047dB 215 180 PHASE 135
VOUT IK 230
50dB 40dB 30dB 20dB 10dB 0dB GAIN -10dB -20dB -30dB 10
15k
90
10F
45 0 -45 -90
VIN 3.03k GND
-135 -180 -215 10M
100
1K
10K
100K
1M
START 10.000Hz
STOP 10 000 000.000Hz
Small Signal Gain and Phase VS Frequency; IK = 10mA, TA = 25C.
Test Circuit for Gain and Phase Frequency Response.
Date: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
5
TYPICAL PERFORMANCE CHARACTERISTICS
VIN
VIN
VOUT
VOUT
IKA = 0 to 1mA.
IKA = 0 to 10mA.
VIN
VIN
VOUT
VOUT
IKA = 0 to 50mA.
IKA = 0 to 80mA.
VIN
VIN
R IK
VOUT
VOUT
fP = 100kHz
50
GND
IKA = 0 to 100mA.
Date: 12/11/04
Test Circuit for Pulse Response.
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
6
TYPICAL PERFORMANCE CHARACTERISTICS
VIN R3 VOUT
VIN ISINK R2
R1 0.1% VREF
Q1
SPX432
SPX432
R2 0.1%
R1 0.1%
Shunt Regulator, VOUT = (1+R1/R2)VREF.
Constant Current Sink ISINK = VREF/R1.
VOUT
VIN
R3 Opto Isolator R1 0.1%
R5 R4
Isolated Feedback
R3 sets feedback gain, C1 provides feedback compensation
C1
C1 C2 + SPX432 R2 0.1% VOUTRTN
R1 0.1% R2 0.1%
R3 VOUT
SPX432
Reference Amplifier for Isolated Feedback in Off-Line DC-DC Converters.
Precision High Current Series Regulator, VOUT = (1+R1/R2)VREF.
VIN
VOUT
VCC
R1 0.1%
R3
R2
R2 0.1% SPX432
Q1
VIN R1
VOUT
SPX432
High Current Shunt Regulator, VOUT = (1+R1/R2)VREF.
Single Supply Comparator with Temperature Compensated Threshold, VIN threshold = 1.24V.
(c) Copyright 2004 Sipex Corporation
Date: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
7
PACKAGE: 8 PIN NSOIC
D e O
E/2 E1/2 E1 L2 E Seating Plane O1 L1
1
L Gauge Plane
O
b
VIEW C
INDEX AREA (D/2 X E1/2)
TOP VIEW
A
A1 Seating Plane A2
SIDE VIEW
8 Pin NSOIC JEDEC MO-012 (AA) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 D 4.90 BSC E 6.00 BSC E1 3.90 BSC e 1.27 BSC L 0.4 1.27 L1 1.04 REF L2 0.25 BSC o 0 8 o1 5 15 Note: Dimensions in (mm)
B
B
SEE VIEW C
b
c
BASE METAL
SECTION B-B WITH PLATING
Date: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
8
PACKAGE: 3PIN SOT-23
D
b 3
B B
E1 E
SEE VIEW C
VIEW A-A
1 e
2
e1
L L1
Gauge Plane Seating Plane
O
VIEW C
A
A A2
Seating Plane
3 Pin SOT-23 SYMBOL A A1 A2 b c D e e1 E E1 L L1 o
JEDEC TO-236 (AB) Variation MIN NOM MAX 0.89 1.12 0.01 0.1 0.88 0.95 1.02 0.3 0.5 0.08 0.2 2.8 2.9 3.04 0.95 BSC 1.90 BSC 0.95 2.64 1.2 1.3 1.4 0.4 0.5 0.6 0.54 REF 0 8
A
C
A1
SIDE VIEW
b
WITH PLATING
c
Note: Dimensions in (mm)
BASE METAL SECTION B-B
Date: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
9
PACKAGE: 3PIN TO 92
L
e
e1 W
D
A
b
S1
SYMBOL A b E e e1 L R S1 W D a
3 Pin TO-92 MIN NOM 0.17 0.014 0.13 0.95 0.045 0.5 0.085 0.045 0.016 0.175 4 -
MAX 0.195 0.02 0.155 0.105 0.055 0.61 0.095 0.06 0.022 0.195 6
R
E
Note: Dimensions in (inches)
a(2x)
Date: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
10
PACKAGE PINOUTS
8-Pin Surface Mount (S) SOT-23-3 (M)
ANODE 1 CATHODE ANODE ANODE N/C 1 2 3 4 8 7 REF 2 3
TO-92 (N)
SPX432
ANODE ANODE N/C 1 REF 2 3 REF CATHODE
SPX432
6 5
CATHODE
ANODE
Top View Top View
Bottom View
ORDERING INFORMATION PART NUMBER SPX432AM .......................... SPX432AM/TR .................... SPX432AS .......................... SPX432AS/TR ..................... SPX432AN .......................... SPX432AN/TR .................... SPX432M ............................ SPX432M/TR ...................... SPX432S ............................. SPX432S/TR ....................... SPX432N ............................. SPX432N/TR ....................... ACC OUTPUT VOLTAGE PACKAGES 0.5% .............. 1.24V .................................. 3-Pin SOT-23 0.5% .............. 1.24V .................................. 3-Pin SOT-23 0.5% .............. 1.24V ................................... 8-Pin NSOIC 0.5% .............. 1.24V ................................... 8-Pin NSOIC 0.5% .............. 1.24V .................................... 3-Pin TO-92 0.5% .............. 1.24V .................................... 3-Pin TO-92 1.0% .............. 1.24V .................................. 3-Pin SOT-23 1.0% .............. 1.24V .................................. 3-Pin SOT-23 1.0% .............. 1.24V ................................... 8-Pin NSOIC 1.0% .............. 1.24V ................................... 8-Pin NSOIC 1.0% .............. 1.24V .................................... 3-Pin TO-92 1.0% .............. 1.24V .................................... 3-Pin TO-92
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX432AM/TR = standard; SPX432AM-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,000 for TO-92 and 2500 for SOT-23 and NSOIC.
CLICK HERE TO ORDER SAMPLES
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: 12/11/04
SPX432 1.24V Precision Adjustable Shunt Regulator
(c) Copyright 2004 Sipex Corporation
11

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