Microsemi Corporation LX432ISE, LX432ISC, LX432CSC, LX432CLP, LX432ILP Datasheet
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LX432
A
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
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 im-
pedance 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.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
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.
PRODUCT HIGHLIGHT
T YPICAL PROGRAMMABLE VOLTAGE
REFERENCE CIRCUIT
V
IN
P RODUCTION DATA SHEET
■ Low Voltage Operation: 1.24V Reference
■ Initial Voltage Reference Accuracy 1%
■ Adjustable Output Voltage From V
■ Typical Output Dynamic Impedance Less
Than 250mΩ
■ Sink Current Capability 80µA To 20mA
■ Direct Alternative To TLV431
APPLICATIONS
■ Low Voltage Adjustable Power Supplies
■ Instrumentation
■ Computers
■ Portable Equipment
V
K
To 20V
REF
Cathode
LX432
Anode
Reference
R2
GND
PACKAGE ORDER INFORMATION
R1
T
(°C)
A
0 to 70 LX432CSC LX432CSE LX432CLP
-40 to 85 LX432ISC LX432ISE LX432ILP
Plastic SOT-23
SC
3-pin
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.
Plastic SOT-23
SE
5-pin
Plastic TO-92
LP
3-pin
Copyright © 1999
Rev. 1.0 9/99
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
LX432
PRODUCT DATABOOK 1996/1997
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Cathode to Anode Voltage (VKA) ................................................................. -0.3V to +20V
Reference Input Current (I
Continuous Cathode Current (I
Operating Junction Temperature
) .................................................................... -50µA to 10µA
REF
) ............................................................. -25mA to 25mA
K
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.
THERMAL DATA
SC PACKAGE:
Thermal Resistance - Junction to Ambient,
SE PACKAGE:
Thermal Resistance - Junction to Ambient,
LP PACKAGE:
Thermal Resistance-Junction to Ambient,
Junction Temperature Calculation: TJ = TA + (P
The θ
numbers are guidelines for the thermal performance of the device/pc-board system.
JA
All of the above assume no ambient airflow
θθ
θ
(PC-Mounted) 220°C/W
θθ
JA
(Non-PC Mounted) 410°C/W
θθ
θ
(PC-Mounted) 220°C/W
θθ
JA
(Non-PC Mounted) 410°C/W
θθ
θ
θθ
JA
x θ
).
D
JA
156°C/W
PACKAGE PIN OUTS
2
CATHODE
ANODE
SC PACKAGE — 3-Pin
N.C.
N.C.
CATHODE
SE PACKAGE — 5-Pin
3
1
(Top View)
15
2
34
(Top View)
REF
ANODE
REF
3. CATHODE
2. ANODE
1. REF
Ref (R)
BLOCK DIAGRAM
Cathode (K)
V
REF
Anode (A)
LP PACKAGE
(Top View)
2
Copyright © 1999
Rev. 1.0 9/99
PRODUCT DATABOOK 1996/1997
LX432
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
P RODUCTION DATA SHEET
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
Reference Voltage V
Reference Voltage Drift
Ratio Of V
Change In Cathode ∆V
REF
Voltage Change
Reference Terminal Current I
Reference Current Drift (Note 2) ∆I
Minimum Cathode Current For Regulation I
Dynamic Impedance Z
Off-state Cathode Current I
(Note 2) ∆V
(Note 3) ∆V
Symbol
REFIK
REFIK
REFIK
KA
REFIK
REFIK
K (MIN)VKA
KAIK
OFFVKA
Note 2. These parameters are guaranteed by design.
∆V
Note 3. Ratio of change in reference input voltage
REF
∆V
KA
to the change in cathode voltage.
Test Conditions
= 10mA, VKA = V
= 10mA, VKA = V
IK = 10mA, VKA = V
= 10mA, VKA = V
= 10mA, VKA = V
= 10mA, VKA = V
IK = 10mA, VKA = V
= V
, TA = 25°C
REF
= 0.1mA to 15mA, VKA = V
= 16V, TA = 25°C
, TA = 25°C
REF
, 0°C ≤ TA ≤ 70°C
REF
, -40°C ≤ TA ≤ 85°C
REF
to 16V, TA = 25°C
REF
, T
= 25°C, R1=10kΩ, R2 = Open
REF
A
, 0°C ≤ TA ≤ 70°C
REF
, -40°C ≤ TA ≤ 85°C
REF
, TA = 25°C
REF
LX432
Min. Typ. Max.
Units
1.228 1.24 1.252 V
312 mV
420 mV
-1 -2.7 mV/V
0.1 0.5 µA
0.05 0.3 µA
0.1 0.4 µA
55 80 µA
0.2 0.4 Ω
0.004 µA
Copyright © 1999
Rev. 1.0 9/99
3
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