FT1431
LT1431
Programmable Reference
Features
■
■
■
■
■
■
Programmable Reference
Description
The
FT1431
is an adjustable shunt voltage regulator with
100mA sink capability, 0.4% initial reference voltage tol-
erance and 0.3% typical temperature stability. On-chip
divider resistors allow the
FT1431
to be configured as a 5V
shunt regulator, with 1% initial voltage tolerance and
requiring no additional external components. By adding
two external resistors, the output voltage may be set to any
value between 2.5V and 36V. The nominal internal current
limit of 100mA may be decreased by including one exter-
nal resistor.
A simplified 3-pin version, the
FT1431CZ/FT1431IZ,
is
available for applications as an adjustable reference and is
pin compatible with the
FT431.
Guaranteed 0.4% Initial Voltage Tolerance
0.1Ω Typical Dynamic Output Impedance
Fast Turn On
Sink Current Capability, 1mA to 100mA
Low Reference Pin Current
Available
in N8, S8 or 3-Lead TO-92 Z Packages
Application
■
■
■
Linear Regulators
Adjustable Power Supplies
Switching
Power Supplies
2.5025
2.5000
2.4975
2.4950
2.4925
2.4900
2.4875
–50 –25
V
REF
(V)
U
U
U
V
REF
vs Temperature
50
25
75
0
TEMPERATURE (°C)
100
125
1
FT1431
Programmable Reference
Absolute Maximum Ratings
(Note 1)
V
+
, V
COLLECTOR
....................................................... 36V
V
COMP
, R
TOP
, R
MID
, V
REF
.......................................... 6V
GND-F to GND-S .................................................... 0.7V
Ambient Temperature Range
FT1431M .........................................
– 55°C to 125°C
FT1431I
............................................ – 40°C to 85°C
FT1431C
.............................................. 0°C TO 70°C
Package/Order Information
TOP VIEW
COLLECTOR 1
COMP 2
V
+
3
R
TOP
4
8
7
6
5
REF
R
MID
GND-F
GND-S
ORDER PART
NUMBER
FT1431CN8
FT1431IN8
FT1431CS8
FT1431IS8
N8 PACKAGE
S8 PACKAGE
8-LEAD PDIP
8-LEAD PLASTIC SO
T
J MAX
= 100°C,
θ
JA
= 130°C/W (N)
T
J MAX
= 100°C,
θ
JA
= 170°C/W (S)
S8 PART MARKING
1431
1431I
FT1431MJ8
T
J MAX
= 150°C,
θ
JA
= 100°C/W (J)
Electrical Characteristics
SYMBOL
V
REF
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. I
K
= 10mA unless otherwise specified (Note 2)
PARAMETER
Reference Voltage
CONDITIONS
V
KA
= 5V, I
K
= 2mA, (Note 3)
V
KA
= 5V, I
K
= 2mA
I
K
= 2mA, V
KA
= 3V to 36V
V
KA
= 5V, T
A
= 25°C
V
KA
= V
REF
to 36V
V
KA
= 36V, V
REF
= 0V
V
COLL
= 36V, V
+
= 5V, V
REF
= 2.4V
V
KA
= V
REF
, I
K
= 1mA to 100mA, f
≤
1kHz
V
KA
= V
REF
+ 50mV
Internal Divider Used, I
K
= 2mA
∆V
REF
/∆T
Reference Drift
∆V
REF
/∆V
KA
Voltage Ratio, Reference to
Cathode (Open-Loop Gain)
|I
REF
|
Reference Input Current
I
MIN
|I
OFF
|
|I
LEAK
|
|Z
KA
|
I
LIM
Minimum Operating Current
Off-State Cathode Current
Off-State Collector Leakage Current
Dynamic Impedance
Collector Current Limit
5V Reference Output
U
U
W
W W
U
W
JunctionTemperature Range
FT1431M
......................................... – 55°C to 150°C
FT1431I
.......................................... – 40°C to 100°C
FT1431C
............................................. 0°C to 100°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
BOTTOM VIEW
ORDER PART
NUMBER
FT1431CZ
FT1431IZ
REF ANODE
CATHODE
Z PACKAGE
3-LEAD TO-92 PLASTIC
T
J MAX
= 100°C,
θ
JA
= 150°C/W
FT1431M/I
MIN TYP MAX
FT1431C
MIN TYP MAX UNITS
2.490 2.500 2.510 2.490 2.500 2.510
V
●
2.465
2.535 2.480
2.520
V
●
50
30
ppm/°C
●
0.2 0.5
0.2 0.5
mV/V
1.0
0.2 1.0
1.5
1.2
0.6 1.0
0.6 1.0
1
1
●
15
2
1
1
●
5
2
0.2
0.2
●
80
360
100
260
4.950 5.000 5.050 4.950 5.000 5.050
●
0.2
µA
µA
mA
µA
µA
µA
µA
Ω
mA
V
Ashley Crt, Henley,
Marlborough, Wilts, SN8 3RH UK
Tel: +44(0)1264 731200
Fax:+44(0)1264 731444
E-mail
info@forcetechnologies.co.uk
tech@forcetechnologies.co.uk
sales@forcetechnologies.co.uk
www.forcetechnologies.co.uk
Unless otherwise stated in this SCD/Data sheet, Force Technologies Ltd reserve the right to make changes, without notice, in the products, Includ
-ing circuits, cells and/or software, described or contained herein in order to improve design and/or performance. Force Technologies resumes no
responsibility or liability for the use of any of these products, conveys no licence or any title under patent, copyright, or mask work to these
products, and makes no representation or warranties that that these products are free from patent, copyright or mask work infringement, unless
otherwise specified.
products, and makes no representation or warranties that that these products are free from patent, copyright or mask work infringement, unless
Life Support Applications
Force Technologies products are not designed for use in life support appliances, devices or systems where malfunction of a Force Technologies
product can reasonably be expected to result in a personal injury. Force Technologies customers using or selling Force Technologies products
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Copyright Force Technologies Ltd 2007
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