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LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
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RODUCTION
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ATA
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DESCRIPTION The LX432 series are low-voltage precision adjustable shunt regulators with a reference voltage of 1.24V. The output voltage may be set to any value between 1.24V and 20V by two external resistors. These devices offer low output impedance for improved load regulation -- typical output impedance is 250m. The LX432 series operates with an operating current as low as 80A, making these devices suitable for portable and micropower applications. Low voltage operation enables the LX432 to be used in the feedback loop of isolated low voltage power supplies. The minimum output voltage is determined by the LX432 output voltage plus the forward voltage drop of the opto-coupler LED (typically 1.24 + 1.4 = 2.64V minimum). See Figure 10. The LX432 is offered in 3 and 5-pin SOT-23 or TO-92 packages, and is a dropin replacement for the TLV431 and SC431L devices.
s s s s
K E Y F E AT U R E S
Low Voltage Operation: 1.24V Reference Initial Voltage Reference Accuracy 1% Adjustable Output Voltage From VREF To 20V Typical Output Dynamic Impedance Less Than 250m s Sink Current Capability 80A To 20mA s Direct Alternative To TLV431
A P P L I C AT I O N S
s s s s Low Voltage Adjustable Power Supplies Instrumentation Computers Portable Equipment
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
T Y P I C A L P R O G R A M M A B L E V O LTA G E REFERENCE CIRCUIT
VIN
Cathode
VKA R1
Reference
LX432
Anode
R2
GND
PA C K A G E O R D E R I N F O R M AT I O N TA (C)
0 to 70 -40 to 85
SC Plastic SOT-23 3-pin
LX432CSC LX432ISC
SE Plastic SOT-23 5-pin
LX432CSE LX432ISE
LP Plastic TO-92 3-pin
LX432CLP LX432ILP
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX432CSET) TO-92 (LP) package also available in ammo-pack.
Copyright (c) 1999 Rev. 1.0 9/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P
RODUCTION
D
ATA
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
Cathode to Anode Voltage (VKA) ................................................................. -0.3V to +20V Reference Input Current (IREF) .................................................................... -50A to 10A Continuous Cathode Current (IK) ............................................................. -25mA to 25mA Operating Junction Temperature Plastic (SC, SE & LP Packages) ............................................................................. 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature ..................................................................................................... 300C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Pin numbers refer to DIL packages only.
2
CATHODE
ANODE
3 1
REF
SC PACKAGE -- 3-Pin (Top View)
T H E R M A L D ATA
SC PACKAGE: Thermal Resistance - Junction to Ambient, JA SE PACKAGE: Thermal Resistance - Junction to Ambient, JA LP PACKAGE: Thermal Resistance-Junction to Ambient, JA 156C/W (PC-Mounted) (Non-PC Mounted) 220C/W 410C/W (PC-Mounted) (Non-PC Mounted) 220C/W 410C/W
N.C. N.C. CATHODE
1 2 3
5
ANODE
4
REF
SE PACKAGE -- 5-Pin (Top View)
3. CATHODE 2. ANODE 1. REF
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow
BLOCK DIAGRAM
LP PACKAGE (Top View)
Cathode (K)
Ref (R)
VREF Anode (A)
2
Copyright (c) 1999 Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX432C with 0C TA 70C, and the LX432I with -40C TA 85C.)
Parameter
Reference Voltage Reference Voltage Drift (Note 2) Ratio Of VREF Change In Cathode Voltage Change (Note 3) Reference Terminal Current Reference Current Drift (Note 2) Minimum Cathode Current For Regulation Dynamic Impedance Off-state Cathode Current VREF VKA
Symbol
VREF VREF VREF VKA IREF IREF IK (MIN) ZKA IOFF
Test Conditions
IK = 10mA, VKA = VREF, TA = 25C IK = 10mA, VKA = VREF, 0C TA 70C IK = 10mA, VKA = VREF, -40C TA 85C IK = 10mA, VKA = VREF to 16V, TA = 25C IK = 10mA, VKA = VREF, TA = 25C, R1=10k, R2 = Open IK = 10mA, VKA = VREF, 0C TA 70C IK = 10mA, VKA = VREF, -40C TA 85C VKA = VREF, TA = 25C IK = 0.1mA to 15mA, VKA = VREF, TA = 25C VKA = 16V, TA = 25C
Min.
1.228
LX432 Typ. Max.
1.24 3 4 -1 0.1 0.05 0.1 55 0.2 0.004 1.252 12 20 -2.7 0.5 0.3 0.4 80 0.4
Units
V mV mV mV/V A A A A A
Note 2. These parameters are guaranteed by design. Note 3. Ratio of change in reference input voltage to the change in cathode voltage.
Copyright (c) 1999 Rev. 1.0 9/99
3
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P
RODUCTION
D
ATA
S
HEET
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
FIGURE # 1. 2. 3. 4. 5. 6. 7. 8. Reference Voltage vs. Junction Temperature Reference Current vs. Junction Temperature Cathode Current vs. Cathode Voltage VREF / VKA vs. Junction Temperature Dynamic Impedance vs. Junction Temperature Minimum Cathode Current For Regulation vs. Junction Temperature Off-State Current vs. Junction Temperature Equivalent Input Noise Voltage vs. Frequency FIGURE # FIGURE # 9.
Parameter Measurement Information
Test Circuit For VKA = VREF
10. Test Circuit For VKA > VREF 11. Test Circuit For IOFF
Typical Applications
12. Flyback With Isolation Using LX431 Or LX431A As Voltage Reference And Error Amplifier 13. LX432 In 3.3V To 2.7V Low Dropout Regulator Application
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Copyright (c) 1999 Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC CURVES
1.25 0.2
VREF : Reference Voltage (V)
IREF : Reference Current ( A)
0.16
1.245
0.12
1.24
0.08
1.235
0.04
1.23 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TJ : Junction Temperature ( C)
TJ : Junction Temperature ( C)
FIGURE 1 -- Reference Voltage vs. Junction Temperature
FIGURE 2 -- Reference Current vs. Junction Temperature
800 700
-1.200
IK : Cathode Current ( A)
600
-1.000
400 300 200 100 0 -100 -200 -1 -0.5 0 0.5 1 1.5
VREF /VKA (mV/V)
500
-0.800
-0.600
-0.400
-0.200 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TJ : Junction Temperature (V)
TJ : Junction Temperature ( C)
FIGURE 3 -- Cathode Current vs. Cathode Voltage
FIGURE 4 -- VREF / VKA vs. Junction Temperature
Copyright (c) 1999 Rev. 1.0 9/99
5
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC CURVES
1.000 120
Dynamic Impedance (Ohm)
0.800
Minimum Cathode Current ( A)
100
80
0.600
60
0.400
40
0.200
20
0.000 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TJ : Junction Temperature ( C)
TJ : Junction Temperature ( C)
FIGURE 5 -- Dynamic Impedance vs. Junction Temperature
FIGURE 6 -- Minimum Cathode Current for Regulation vs. Junction Temperature
0.012
350
0.010
Noise Voltage (nV/sqrt(Hz))
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Off-State Current ( A)
300
0.008
0.006
250
0.004
200
0.002
0.000
150 10 100 1K 10K 100K
TJ : Junction Temperature ( C)
Frequency (Hz)
FIGURE 7 -- Off-State Current vs. Junction Temperature
FIGURE 8 -- Equivalent Input Noise Voltage vs. Frequency
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Copyright (c) 1999 Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P
RODUCTION
D
ATA
S
HEET
PA R A M E T E R M E A S U R E M E N T I N F O R M AT I O N
Input
IK
VKA
Input
IK
VKA
R1
IREF
VREF
R2
VREF
FIGURE 9 -- Test Circuit For VKA = VREF
FIGURE 10 -- Test Circuit For VKA > VREF
Input IOFF
VKA
FIGURE 11 -- Test Circuit For IOFF
Copyright (c) 1999 Rev. 1.0 9/99
7
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P
RODUCTION
D
ATA
S
HEET
T Y P I C A L A P P L I C AT I O N
VIN 110/220V AC
VOUT 3.3V
Controller UC384x/LX155x
DRV V CC ISENSE GND VFB
LX432
FIGURE 12 -- LX432 In A Power Supply Isolated Feedback Application
12V
3 .3 V
0 .1 F 5009 1409
470F
0 .1 F
( e .g . In te l i7 4 0
2 .7 V
(R)
c h ip s e t)
LX432
1209
1000F
0 .1 F
FIGURE 13 -- LX432 In 3.3V To 2.7V Low Dropout Regulator Application
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
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Copyright (c) 1999 Rev. 1.0 9/99

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