Microsemi LX432ILP Low voltage adjustable precision shunt regulator Datasheet

LX432
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
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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
250mΩ. The LX432 series operates with
an operating current as low as 80µA,
making these devices suitable for portable and micropower applications.
D
A T A
S
H E E T
K E Y F E AT U R E S
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Low Voltage Operation: 1.24V Reference
Initial Voltage Reference Accuracy 1%
Adjustable Output Voltage From VREF To 20V
Typical Output Dynamic Impedance Less
Than 250mΩ
■ Sink Current Capability 80µA To 20mA
■ Direct Alternative To TLV431
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.
A P P L I C AT I O N S
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IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
Low Voltage Adjustable Power Supplies
Instrumentation
Computers
Portable Equipment
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
VKA
R1
Cathode
LX432
Reference
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
SOT-23
SC Plastic
3-pin
LX432CSC
LX432ISC
SOT-23
SE Plastic
5-pin
LX432CSE
LX432ISE
TO-92
LP Plastic
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 © 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
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
P
R O D U C T I O N
A B S O L U T E M A X I M U M R AT I N G S
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H E E T
PACKAGE PIN OUTS
(Note 1)
Cathode to Anode Voltage (VKA) ................................................................. -0.3V to +20V
Reference Input Current (IREF) .................................................................... -50µA to 10µA
Continuous Cathode Current (IK) ............................................................. -25mA to 25mA
Operating Junction Temperature
Plastic (SC, SE & LP Packages) ............................................................................. 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature ..................................................................................................... 300°C
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.
T H E R M A L D ATA
SC PACKAGE:
Thermal Resistance - Junction to Ambient, θJA
(PC-Mounted)
220°C/W
(Non-PC Mounted)
410°C/W
(PC-Mounted)
220°C/W
(Non-PC Mounted)
410°C/W
SE PACKAGE:
Thermal Resistance - Junction to Ambient, θJA
ANODE
2
CATHODE
1
REF
3
SC PACKAGE — 3-Pin
(Top View)
N.C.
1
N.C.
2
CATHODE
3
5
ANODE
4
REF
SE PACKAGE — 5-Pin
(Top View)
LP PACKAGE:
Thermal Resistance-Junction to Ambient, θJA
156°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow
BLOCK DIAGRAM
3. CATHODE
2. ANODE
1. REF
LP PACKAGE
(Top View)
Cathode (K)
Ref (R)
VREF
Anode (A)
2
Copyright © 1999
Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
LX432
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
P
R O D U C T I O N
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H E E T
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX432C with 0°C ≤ TA ≤ 70°C, and the LX432I
with -40°C ≤ TA ≤ 85°C.)
Parameter
Symbol
Reference Voltage
Reference Voltage Drift (Note 2)
VREF
∆VREF
Ratio Of VREF Change In Cathode
Voltage Change (Note 3)
Reference Terminal Current
Reference Current Drift (Note 2)
∆VREF
∆VKA
IREF
∆IREF
Minimum Cathode Current For Regulation
Dynamic Impedance
Off-state Cathode Current
IK (MIN)
ZKA
IOFF
Test Conditions
IK = 10mA, VKA = VREF, TA = 25°C
IK = 10mA, VKA = VREF, 0°C ≤ TA ≤ 70°C
IK = 10mA, VKA = VREF, -40°C ≤ TA ≤ 85°C
IK = 10mA, VKA = VREF to 16V, TA = 25°C
IK = 10mA, VKA = VREF, TA = 25°C, R1=10kΩ, R2 = Open
IK = 10mA, VKA = VREF, 0°C ≤ TA ≤ 70°C
IK = 10mA, VKA = VREF, -40°C ≤ TA ≤ 85°C
VKA = VREF, TA = 25°C
IK = 0.1mA to 15mA, VKA = VREF, TA = 25°C
VKA = 16V, TA = 25°C
Min.
1.228
LX432
Typ. Max.
Units
1.24
3
4
-1
1.252
12
20
-2.7
V
mV
mV
mV/V
0.1
0.05
0.1
55
0.2
0.004
0.5
0.3
0.4
80
0.4
µA
µA
µA
µA
Ω
µA
Note 2. These parameters are guaranteed by design.
Note 3.
∆VREF
∆VKA
Copyright © 1999
Rev. 1.0 9/99
Ratio of change in reference input voltage
to the change in cathode voltage.
3
PRODUCT DATABOOK 1996/1997
LX432
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
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GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
4
Parameter Measurement Information
FIGURE #
FIGURE #
1.
Reference Voltage vs. Junction Temperature
9.
2.
Reference Current vs. Junction Temperature
10. Test Circuit For VKA > VREF
3.
Cathode Current vs. Cathode Voltage
11. Test Circuit For IOFF
4.
∆VREF / ∆VKA vs. Junction Temperature
5.
Dynamic Impedance vs. Junction Temperature
6.
Minimum Cathode Current For Regulation vs. Junction
Temperature
FIGURE #
7.
Off-State Current vs. Junction Temperature
12. Flyback With Isolation Using LX431 Or LX431A As Voltage
Reference And Error Amplifier
8.
Equivalent Input Noise Voltage vs. Frequency
13. LX432 In 3.3V To 2.7V Low Dropout Regulator Application
Test Circuit For VKA = VREF
Typical Applications
Copyright © 1999
Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
LX432
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
P
R O D U C T I O N
D
S
A T A
H E E T
CHARACTERISTIC CURVES
0.2
IREF : Reference Current ( A)
VREF : Reference Voltage (V)
1.25
1.245
1.24
1.235
0.16
0.12
0.08
0.04
0
1.23
-40 -30 -20 -10 0
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
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
-1.200
600
-1.000
500
∆VREF /∆VKA (mV/V)
IK : Cathode Current ( A)
700
400
300
200
100
0
-0.800
-0.600
-0.400
-100
-200
-0.200
-1
-0.5
0
0.5
1
TJ : Junction Temperature (V)
FIGURE 3 — Cathode Current vs. Cathode Voltage
Copyright © 1999
Rev. 1.0 9/99
1.5
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
TJ : Junction Temperature ( C)
FIGURE 4 — ∆VREF / ∆VKA vs. Junction Temperature
5
PRODUCT DATABOOK 1996/1997
LX432
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
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R O D U C T I O N
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H E E T
CHARACTERISTIC CURVES
120
Minimum Cathode Current ( A)
Dynamic Impedance (Ohm)
1.000
0.800
0.600
0.400
0.200
0.000
100
80
60
40
20
0
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
-40 -30 -20 -10
TJ : Junction Temperature ( C)
0
10 20 30 40 50 60 70 80 90
TJ : Junction Temperature ( C)
FIGURE 5 — Dynamic Impedance vs. Junction Temperature
FIGURE 6 — Minimum Cathode Current for Regulation
vs. Junction Temperature
0.012
350
Noise Voltage (nV/sqrt(Hz))
Off-State Current ( A)
0.010
0.008
0.006
0.004
0.002
0.000
250
200
150
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90
TJ : Junction Temperature ( C)
FIGURE 7 — Off-State Current vs. Junction Temperature
6
300
10
100
1K
10K
100K
Frequency (Hz)
FIGURE 8 — Equivalent Input Noise Voltage vs. Frequency
Copyright © 1999
Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
LX432
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
P
R O D U C T I O N
D
A T A
S
H E E T
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
VKA
Input
VKA
Input
IK
IK
R1
IREF
R2
VREF
VREF
FIGURE 10 — Test Circuit For VKA > VREF
FIGURE 9 — Test Circuit For VKA = VREF
VKA
Input
IOFF
FIGURE 11 — Test Circuit For IOFF
Copyright © 1999
Rev. 1.0 9/99
7
PRODUCT DATABOOK 1996/1997
LX432
L OW V OLTAGE A DJUSTABLE P RECISION S HUNT R EGULATORS
P
D
R O D U C T I O N
A T A
S
H E E T
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
1 2 V
3 .3 V
0 .1 µ F
4 7 0 µ F
0 .1 µ F
5 0 0 9
2 .7 V
1 4 0 9
L X 4 3 2
1 2 0 9
( e .g . In te l i7 4 0
1 0 0 0 µ F
®
c h ip s e t)
0 .1 µ 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.
8
Copyright © 1999
Rev. 1.0 9/99
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