SHUNT REGULATOR. US431AL Datasheet

US431AL REGULATOR. Datasheet pdf. Equivalent


Part US431AL
Description LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
Feature FEATURES SOT23-5 package 0.5% Voltage Reference Initial Accuracy (US431AL) Low Operational Cathode C.
Manufacture UNISEM
Datasheet
Download US431AL Datasheet


FEATURES SOT23-5 package 0.5% Voltage Reference Initial Accu US431AL Datasheet
Recommendation Recommendation Datasheet US431AL Datasheet




US431AL
FEATURES
SOT23-5 package
0.5% Voltage Reference Initial Accuracy
(US431AL)
Low Operational Cathode Current
(80 uA max)
Unconditionally Stable with only 1uF
Adjustable Output from 1.24V to 6V
0.25Typical Output Impedance
Pin to Pin Compatible with TLV431
APPLICATIONS
Precision Voltage Reference
Linear Regulator Controller
Secondary Side Controller for the Low Voltage
Power Supply Applications
US431L/431AL
LOW -VOLTAGE ADJUSTABLE
PRECISION SHUNT REGULATOR
PRELIMINARY DATASHEET
DESCRIPTION
The US431L product is a 3 terminal adjustable shunt
regulator that can also be used as a precision voltage
reference. Its output voltage may be set to any value
between Vref(1.24V) and 6V with two external resistors
as shown in the typical application circuit. Other appli-
cations of this device include the use as a merged am-
plifier and reference in applications such as Linear regu-
lator or as the secondary side controller in low voltage
power supply applications. The US431L only requires
80uA maximum quiescent current before regulating,
making it ideal as a voltage reference for battery type
applications.
TYPICAL APPLICATION
RB
V IN
US431
Vo = Vref × 1+ RR21
431app1-1.0
VO
R1
Co
R2
Typical application of the US431L as a shunt regulator / voltage reference.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
0 TO 70
5 LEAD
SOT23-5
US431LCL
US431ALCL
Rev. 1.2
5/11/98
3 PIN PLASTIC
TO-92
US431LCZ
US431ALCZ
8 PIN PLASTIC
SOIC
US431LCS
US431ALCS
2-1



US431AL
US431L/431AL
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) ............................................................. 7V
Continuous Cathode Current Range ......................................... -20 mA to +20 mA
Reference Current Range ...................................................... -0.05 mA to 3 mA
Storage Temperature Range ................................ -65°C TO 150°C
Operating Junction Temperature Range ...................... 0°C TO 150°C
PACKAGE INFORMATION
5 PIN SOT 23 (L)
TOP VIEW
NC 1
5 Anode
NC 2
Cathode 3
4 Ref
θJA = 450°C/W
3 PIN PLASTIC TO-92 (Z)
BOTTOM VIEW
1 Ref
2 Anode
3 Cathode
θJA = 162°C/W
8 PIN PLASTIC SOIC (S)
TOP VIEW
Cathode 1
8 Ref
NC 2
7 NC
Anode 3
6 Anode
NC 4
5 NC
θJA=160°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over Ta=0 to 70 °C, CO =1uF. Typical values refer to
Ta=25 °C.Low duty cycle pulse testing are used which keeps junction and case temperatures equal to the
ambient temperature.
PARAMETER
SYM
Reference Voltage
Vref
US431L
Reference Voltage
Vref
US431AL
Vref deviation over full Vref(dev)
temperature range
Ratio of Vref change to dVref/dVKA
Cathode voltage change
Reference pin current
Iref deviation over full Iref(dev)
temperature range
Minimum cathode current IK(min)
Off state cathode current Ioff
Dynamic impedance
Zka0
TEST CONDITION
IK=10mA,VKA=Vref,Ta=25°C
IK=10mA,VKA=Vref
IK=10mA,VKA=Vref,Ta=25°C
IK=10mA,VKA=Vref
VKA=Vref, IK=10mA
Note 1
IK=10mA , dVKA=Vref to 6 V
IK=10mA , R1=10k, R2=open
IK=10mA , R1=10k, R2=open
Note 1
VKA=Vref
VKA=6V , Vref=0V
VKA=Vref, f<1 kHz,
IK=0.1 to 15 mA , Note 2
MIN
1.228
1.221
1.234
1.228
TYP MAX
1.240 1.252
1.240 1.259
1.240 1.246
1.240 1.252
4 12
UNITS
V
V
mV
-1.5 -2.7 mV/V
0.15 0.5
0.05 0.3
uA
uA
55
0.001
0.25
80
0.1
0.4
uA
uA
Note 1 : The deviation parameters, Vref(dev) and Iref(dev) are
defined as the differences between the maximum and the minimum
values obtained over the rated temperature range. The average full
range temperature coeficient of the reference input voltage is de-
fined as :
αVref
=

Vref(dev)
Vref(25° C)

×
106
TA
Where:
αVref unit is ppm/° C
Note 2 :
Thedynamic impedance when VKA = Vref is defined as :
Zka0 = VKA
IK
When the device is operating with two external
resistors (see Figure 2), the total dynamic impedance
of the circuit is given by:
Zka
=
V
I
=
Zka0
×
 1 +
R1
R2 
TA is the rated operating free air temperature
of the device.
αVref can be positive or negative depending on whether
minimum Vref or maximum Vref, respectively occurs at the
lower temperature.
2-2
Rev. 1.2
5/11/98







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