US431ALCS UNISEM [UNISEM], US431ALCS Datasheet - Page 2

• Manufacturer Part Number: US431ALCS
• Description: LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
• Manufacturer: UNISEM [UNISEM]

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