ZTLV431
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%; a B grade is planned with an initial
tolerance of 0.5%, and all cover the -40°C to
125°C temperature range as standard.
Features
•
•
•
Low voltage operation V
REF
= 1.24V
Temperature range -40 to 125°C
Reference voltage tolerance at 25°C
•
•
•
•
•
•
•
•
•
0.5% ZTLV431B
1% ZTLV431A
Applications
•
•
•
•
Opto-coupler linearization
Linear regulators
Improved Zener
Variable reference
Typical temperature drift
4 mV (0°C to 70°C)
6 mV (-40°C to 85°C)
11mV (-40°C to 125°C
Pin connections
ZTLV431_F (SOT23)
(top view)
100 A minimum cathode current
0.25
typical output impedance
Adjustable output voltage 1.24V to 10V
Ref 1
3 Anode
Cathode 2
Ordering information
Tol.
Order code
Package Part mark Status
(*)
SOT23-5
SOT23
SOT23F
SOT23-5
SOT23
SOT23F
S1A
S1A
S1A
S1B
S1B
S1B
Preview
Active
Preview
Preview
Preview
Preview
Reel size
Tape width
(inches)
(mm)
7” (180mm)
8
7” (180mm)
8
7” (180mm)
8
7” (180mm)
8
7” (180mm)
8
7” (180mm)
8
Quantity
per reel
3000
3000
3000
3000
3000
3000
ZTLV431AE5TA
1%
ZTLV431AFTA
ZTLV431AFFTA
ZTLV431BE5TA
0.5% ZTLV431BFTA
ZTLV431BFFTA
NOTES:
(*) For availability of preview status devices contact your local Zetex sales representative
Issue 4 - April 2007
© Zetex Semiconductors plc 2007
1
www.zetex.com
ZTLV431
Absolute maximum ratings
Cathode voltage (V
KA
)
Continuous cathode current (I
KA
)
Reference input current range (I
REF
)
Operating junction temperature
Storage temperature
10V
-20 to 20mA
-0.05 to 3mA
-40 to 150°C
-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
P
DIS
T
A
=25°C
500 mW
330 mW
780 mW
SOT23-5
SOT23
SOT23F
250°C/W
380°C/W
160°C/W
Recommended operating conditions
Min.
V
KA
cathode voltage
I
KA
cathode current
T
A
operating ambient temperature range
V
REF
0.1
-40
Max.
10
15
125
Units
V
mA
°C
Issue 4 - April 2007
© Zetex Semiconductors plc 2007
2
www.zetex.com
ZTLV431
Electrical characteristics (electrical characteristics over recommended operating
conditions, T
A
= 25°C, K
KA
= V
REF
, I
KA
= 10mA unless otherwise stated)
Symbol
Parameter
Conditions
ZTLV431A
ZTLV431B
V
REF
Reference voltage
T
A
= -40 to 85°C
T
A
= -40 to 125°C
T = 0 to 70°C
Deviation of reference
A
T
A
= -40 to 85°C
V
REF(dev)
voltage over full
temperature range
T
A
= -40 to 125°C
ΔV
REF
----------------
-
ΔV
KA
Min.
1.228
1.234
1.215
1.224
1.209
1.221
Typ.
1.24
1.24
Max. Units
1.252
1.246
1.265
1.259
1.271
1.265
V
ZTLV431A
ZTLV431B
ZTLV431A
ZTLV431B
4
6
11
-1.5
-1.5
12
20
31
-2.7
-2.7
mV/V
µA
mV
6V
Ratio of change in
V
KA
from V
REF
to 10V
reference voltage
to
the change in cathode I
KA
= 10mA
voltage
Reference input current
I
KA
= 10mA, R
1
= 10k ., R
2
= OC
T
A
= 0 to 70°C
I = 10mA,
KA
I
REF
I
REF(dev)
I
KMIN
I
K(OFF)
z
KA
0.1
0.05
0.1
0.15
55
10
0.25
0.5
0.3
0.4
0.5
100
30
0.4
I
REF
deviation over full
R
1
= 10k ,
temperature range
R
2
= OC
Minimum cathode
current for regulation
Off-state current
Dynamic output
impedance
T
A
= -40 to 85°C
T
A
= -40 to 125°C
T
A
= -40 to 125°C
µA
µA
µA
V
KA
= V
REF
V
KA
= 10V, V
REF
=0V
V
KA
= V
REF
, f = <1kHz,
I
K
= 0.1 to 15mA
Deviation of reference input voltage, V
DEV
, is defined as the maximum variation of the reference
input voltage over the full temperature range.
The average temperature coefficient of the reference input voltage, V
REF
is defined as:
V
DEV
x
1000000
ppm
-
V
REF
⎛
------------
⎞
=
-----------------------------------------
-
V
max
⎝ °C ⎠
(
T
–
T
)
V
REF
1
2
The dynamic output impedance, Z
K
A, is defined as:
Δ
V
K
Z
KA
=
---------
-
Δ
I
K
V
min
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:
T1
V
dev
= V
max
- V
min
Z′
=
Z
KA
x
(
1 +
R1
)
------
-
R2
Temperature
T2
Issue 4 - April 2007
© Zetex Semiconductors plc 2007
3
www.zetex.com
ZTLV431
Typical characteristics
I
L
Input
V
Z
I
Z
I
L
Input
V
Z
I
Z
Input
V
Z
I
ZOFF
I
ref
R1
47nF
I
ref
47nF
47nF
V
ref
R2
V
ref
Fig 1 - Test circuit for V
Z
= V
ref
Fig 2 - Test circuit for V
Z
> V
ref
Fig 3 - Test circuit for for Off
state current
†
Pin connections - preview status devices
ZTLV431_FF (SOT23F)
(top view)
ZTLV431_E5 (SOT23-5)
(top view)
Ref 1
N/C 1
5 Anode
Cathode 2
P
w
vie
3 Anode
re
w
vie
re
4 Ref
Cathode
P
3
* 2
*
Pin 2 should be left floating
or connected to pin 5
Issue 4 - April 2007
© Zetex Semiconductors plc 2007
4
www.zetex.com
ZTLV431
Package outline - SOT23
E
e
b
3 leads
e1
L1
E1
D
A
A1
L
c
Dim.
A
A1
b
C
D
e
Millimeters
Min.
-
0.01
0.30
0.085
2.80
Max.
1.12
0.10
0.50
0.120
3.04
-
Inches
Min.
0.0004
0.012
0.003
0.110
Max.
0.044
0.004
0.020
0.008
0.120
Dim.
e1
E
E1
L
L1
-
Millimeters
Min.
2.10
1.20
0.25
0.45
-
Max.
2.64
1.40
0.62
0.62
-
1.90 NOM
Inches
Max.
0.083
0.047
0.018
0.018
-
Max.
0.104
0.055
0.024
0.024
-
0.075 NOM
0.95 NOM
0.0375 NOM
Note:
Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Issue 4 - April 2007
© Zetex Semiconductors plc 2007
5
www.zetex.com
京公网安备 11010802033920号
EEWORLD
