Diodes ZTLV431 User Manual
ZTLV431
3Ref
ZTLV431_F (SOT23)
(top view)
Cathode
2
1 Anode
1.24V Cost effective shunt regulator
Description
The ZTLV431 is a three terminal adjustable
shunt regulator offering excellent temperature
stability and output current handling capability
up to 20mA. The output voltage may be set to
any chosen voltage between 1.24 volts and 10
volts by selection of two external divider
resistors.
The ZTLV431 can be used as a replacement for
zener diodes in many applications requiring an
improvement in zener performance.
The ZTLV431 is available as standard as an
A grade which has an initial tolerance of 1%
and covers the -40°C to 125°C temperature
range as standard.
Features
• Low voltage operation V
• Temperature range -40 to 125°C
• Reference voltage tolerance at 25°C
• 1% ZTLV431A
• Typical temperature drift
• 4 mV (0°C to 70°C)
• 6 mV (-40°C to 85°C)
• 11mV (-40°C to 125°C
•100A minimum cathode current
•0.25⍀ typical output impedance
• Adjustable output voltage 1.24V to 10V
= 1.24V
REF
Applications
• Opto-coupler linearization
• Linear regulators
• Improved Zener
• Variable reference
Pin connections
Ordering information
Tol. Order code Package Part mark Status Reel size
(inches)
1% ZTLV431AFTA SOT23 S1A Active 7” (180mm) 8 3,000
Tape width
(mm)
Quantity
per reel
Issue 7 - April 2008 1 www.zetex.com
© Zetex Semiconductors plc 2008
Absolute maximum ratings
Cathode voltage (VKA) 10V
ZTLV431
Continuous cathode current (I
Reference input current range (I
) -20 to 20mA
KA
) -0.05 to 3mA
REF
Operating junction temperature -40 to 150°C
Storage temperature -55 to 150°C
Operation above the absolute maximum rating may cause device failure. Operation at the
absolute maximum ratings, for extended periods, may reduce device reliability.
Unless otherwise stated voltages specified are relative to the ANODE pin.
Package thermal data
Package ⍜
JA
SOT23 380°C/W 330 mW
SOT23F 160°C/W 780 mW
P
T
=25°C
A
DIS
Recommended operating conditions
Min. Max. Units
cathode voltage V
V
KA
REF
10 V
cathode current 0.1 15 mA
I
KA
operating ambient temperature range -40 125 °C
T
A
Issue 7 - April 2008 2 www.zetex.com
© Zetex Semiconductors plc 2008
ZTLV431
ΔV
REF
ΔV
KA
-----------------
V
max
V
min
T1 T2
V
dev=Vmax-Vmin
Temperature
V
REF
ppm
°C
-------------
⎠
⎞
⎝
⎛
V
DEV
x 1000000
V
REF
T1T
2
–()
------------------------------------------
=
Z
KA
ΔV
K
ΔI
K
----------=
Z′ ZKAx
R
R
+
()=
Electrical characteristics (electrical characteristics over recommended operating
conditions, TA = 25°C, KKA = V
Symbol Parameter Conditions Min. Typ. Max. Units
V
REF
V
REF(dev)
I
REF
I
REF(dev)
I
KMIN
I
K(OFF)
z
KA
Reference voltage
Deviation of reference
voltage over full
temperature range
Ratio of change in
reference voltage to
the change in cathode
voltage
Reference input current
I
deviation over full
REF
temperature range
Minimum cathode
current for regulation
Off-state current V
Dynamic output
impedance
, I
REF
= 10mA unless otherwise stated)
KA
ZTLV431A 1.228 1.24 1.252
T
= -40 to 85°C ZTLV431A 1.215 1.265
A
TA = -40 to 125°C
= 0 to 70°C 4 12
T
A
= -40 to 85°C 6 20
T
A
TA = -40 to 125°C
ZTLV431A 1.209 1.271
11 31
V
mV
6V -1.5 -2.7
VKA from V
= 10mA
I
KA
REF
to
10V -1.5 -2.7
mV/V
IKA = 10mA, R1 = 10k⍀., R2 = OC 0.1 0.5 µA
= 0 to 70°C 0.05 0.3
T
= 10mA,
I
KA
R
= 10k⍀,
1
= OC
R
2
VKA = V
VKA = V
I
K
REF
= 10V, V
KA
, f = <1kHz,
REF
= 0.1 to 15mA
A
= -40 to 85°C 0.1 0.4
T
A
TA = -40 to 125°C
TA = -40 to 125°C
=0V 10 30 µA
REF
0.15 0.5
55 100 µA
0.25 0.4 ⍀
µA
Deviation of reference input voltage, V
, is defined as the maximum variation of the reference
DEV
input voltage over the full temperature range.
The average temperature coefficient of the reference input voltage, V
The dynamic output impedance, Z
A, is defined as:
K
is defined as:
REF
When the device is programmed with two externalresistors, R1
and R2, (fig 2) , the dynamic output impedance of the overall
circuit, Z’, is defined as:
Issue 7 - April 2008 3 www.zetex.com
© Zetex Semiconductors plc 2008
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