TA76L431FT/S
TOSHIBA Bipolar Linear Integrated Circuit
Silicon Monolithic
TA76L431FT,TA76L431S
2.49-V Adjustable High-Precision Shunt Regulators
These devices are adjustable high-precision shunt regulators
whose output voltage (V
KA
) can be set arbitrarily using two
external resistors.
The devices have a precise internal reference voltage of 2.49 V,
enabling them to operate at low voltage. In addition, they can be
used as zener diodes to perform temperature compensation.
TA76L431FT
Features
•
•
•
•
•
•
Precision reference voltage
: V
REF
= 2.49V ± 1.0% (Ta = 25ºC)
Adjustable output voltage
: V
REF
≤
V
OUT
≤
19 V
Minimum cathode current for regulation
:I
kmin
= 0.5 mA (max.)
Operating temperature: Ta =
−40~85ºC
Packages: UFV (TA76L431FT),
TO-92MOD (TA76L431S)
The TA76L431FT is housed in an ultra-thin UFV package.
(thickness: 0.7 mm typ.)
Weight
SSOP5-P-0.65C : 0.007 g (typ.)
SSIP3-P-1.27
: 0.36 g (typ.)
TA76L431S
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2006-11-06
TA76L431FT/S
Pin Assignment/Marking
TA76L431FT
5
4
1: NC
2: ANODE (A)
3: CATHODE (K)
4: REFERENCE (REF)
5: ANODE (A)
3
TA76L431S
1
2
3
TA76L
431S
1F
1
2
1: REFERENCE (REF)
2: ANODE (A)
3: CATHODE (K)
A line indicates
lead (Pb)-free finish.
Lot No: (weekly code)
How to Order
Product No.
TA76L431FT (TE85L,F
TA76L431S(Q)
TA76L431S (TPE6,Q)
Package Type
UFV
(surface-mount type)
TO-92MOD
(lead type)
Packing Type and Capacity
Embossed tape: 3000/tape
Loose in bag: 200/bag
Radial tape: 2000/tape
Minimum Order
1 tape
1 bag
1 tape
Note: The lead pitch for the TA76L431S(Q) and TA76L431S(TPE6,Q) may vary.
Functional Block Diagram
Cathode (K)
Circuit Symbol
Cathode (K)
Reference (REF)
Reference (REF)
2.49V
Anode (A)
Anode (A)
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2006-11-06
TA76L431FT/S
Typical Application Circuits
(1) 2.49 V Reference (V
KA
=
V
REF
)
V
IN
V
OUT
=
2.49 V
(2) Shunt regulator (V
KA
>
V
REF
)
V
IN
R1
V
OUT
R2
V
REF
⎛
R
⎞
⎜
V
OUT
=
V
REF
⎜
1
+
1
⎟ +
I
REF
⋅
R1
R
2
⎟
⎝
⎠
Precautions during Use
1. TA76L431FT, TA76L431S
These products contain MOS elements. Please take care to avoid generating static electricity when handling
these devices.
2. TA76L431FT, TA76L431S
The oscillation frequency of these devices is determined by the value of the capacitor connected between the
anode and the cathode.
When establishing maximum operating condition parameters, please derate the maximum rating values
specified in these datasheets so as to allow an operational safety margin.
Use of a laminated ceramic capacitor is recommended
3. Precautions when handling anode pin of TA76L431FT
Pin 2 and pin 5 should normally be shorted together. If only pin 5 is used, pin 2 should either be left open or
always kept at a lower potential than pin 5. Do not leave pin 5 open and use pin 2 only.
Absolute Maximum Ratings
(Ta
=
25°C)
Characteristics
Cathode voltage
Cathode current
Cathode-anode reverse current
Reference voltage
Reference current
Reference-anode reverse current
Power dissipation
Thermal
resistance
TA76L431FT
TA76L431S
TA76L431FT
TA76L431S
Symbol
V
KA
I
K
−I
K
V
REF
I
REF
−I
REF
P
D
Rating
20
50
50
7
50
10
0.45 (Note 1)
0.8
277 (Note 1)
156
−40∼85
150
−55∼150
Unit
V
mA
mA
V
μA
mA
W
R
th
T
opr
T
j
T
stg
ºC/W
ºC
ºC
ºC
2
Operating temperature
Junction temperature
Storage temperature
Note 1: Glass epoxy substrate mounting: 30 mm
×
30 mm
×
0.8 mmt (Cu pad area 35 mm )
Note 2: Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may cause this product to decrease in the reliability significantly
even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute
maximum ratings and the operating ranges.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/Derating Concept and Methods) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc).
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2006-11-06
TA76L431FT/S
Recommended Operating Conditions
Characteristics
Cathode voltage
Cathode current
Operating temperature
Symbol
V
KA
I
K
T
opr
Min
V
REF
0.5
−40
Typ.
Max
19
40
85
Unit
V
mA
°C
⎯
⎯
⎯
Electrical Characteristics
(Unless otherwise specified, Ta
=
25°C, I
K
=
10 mA)
Characteristics
Reference voltage
Deviation of reference input voltage
over temperature
Ratio of change in reference input
voltage to the change in cathode
voltage
Reference Input current
Deviation of reference input current
over temperature
Minimum cathode current for
regulation
Off-State cathode current
Dynamic impedance
Symbol
V
REF
V
REF (dev)
ΔV
REF
/ΔV
I
REF
I
REF (dev)
I
Kmin
I
Koff
⎪Z
KA
⎪
V
KA
=
V
REF
0°C
<
Ta
<
70°C, V
KA
=
V
REF
=
=
V
REF
<
V
KA
<
10 V
=
=
10V
<
V
KA
<
19 V
=
=
V
KA
=
V
REF
0°C
<
Ta
<
70°C, V
KA
=
V
REF
,
=
=
R
1
=
10 kΩ, R
2
= ∞
V
KA
=
V
REF
V
KA
=
19 V, V
REF
=
0 V
V
KA
=
V
REF
, f
<
1 kHz,
=
0.5 mA
<
I
K
<
40 mA
= =
Test Condition
Min
2.465
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Typ.
2.49
5
0.8
0.8
0.6
0.3
0.2
⎯
0.2
Max
2.515
15
2.4
2.0
3
1.2
0.5
1.0
0.5
Unit
V
mV
mV/V
μA
μA
mA
μA
Ω
The deviation parameters V
REF (dev)
and I
REF (dev)
are defined as the maximum variation of the V
REF
and I
REF
over
the rated temperature range(Ta=0 to 70℃).
The average temperature coefficient of the V
REF
is defined as:
V
REF
max
V
REF (dev)
min
6
⎛
V
⎜
REF (dev)
×
10
⎜
V
⎜
REF
@25
°
C
⎝
α
V
REF
=
Δ
Ta
⎞
⎟
⎟
⎟
⎠
(
ppm
°
C
)
ΔTa
Application Circuit Example
Error amplification circuit for switching power supply
Photo-
coupler
V
OUT
GND
Shunt regulator
This circuit amplifies the difference between the switching power supply’s secondary output voltage and the shunt
regulator’s reference voltage. It then feeds the amplified voltage back to the primary input voltage via the
photocoupler.
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2006-11-06
TA76L431FT/S
P
Dmax
– Ta
0.6
P
Dmax
– Ta
1.0
(W)
: 30
×
30
×
0.8 mm t
0.5
Cupper pad area: 35 mm
2
Allowable power dissipation P
Dmax
Allowable power dissipation P
Dmax
(W)
TA76L431FT
Mounted on glass epoxy substate
TA76L431S
0.8
0.4
0.6
0.3
0.4
0.2
0.1
0.2
0
0
20
40
60
80
100
120
140
160
0
0
20
40
60
80
100
120
140
160
Ambient temperature Ta (°C)
Ambient temperature Ta (°C)
I
K
– V
KA
50
Input
IK
VKA
600
Input
I
K
– V
KA
VKA
IK
400
VKA
=
VREF
Ta
=
25°C
200
85°C
0
85°C
25°C
Ta
= −40°C
−200
−1.0
−0
1.0
Ta
= −40°C
25°C
IK min
(mA)
20
VKA
=
VREF
Ta
=
25°C
I
K
Cathode current
0
−20
85°C
25°C
Ta
= −40°C
−50
−1.0
0
1.0
2.0
3.0
Cathode current
I
K
(μA)
2.0
3.0
Cathode voltage
V
KA
(V)
Cathode voltage
V
KA
(V)
V
REF
– Ta
2.53
2.53
VVKA
=
VREF
KA
=
VREF
Input
Inpu
IKK
=
10 mA
I
=
10 mA
2.51
2.51
VVREF
REF
ΔV
REF
– V
KA
Change in reference voltage
ΔV
REF
(mV)
VVKA
KA
IKK
I
0
Reference voltage V
REF
(V)
-10
2.49
2.49
Input
−20
VREF
VKA
IK
2.47
2.47
R2
R1
IK
=
10 mA
Ta
=
25°C
2.45
2.45
−50
−50
0
0
50
50
100
100
150
−30
0
5
10
15
20
25
Ambient temperature Ta (°C)
Cathode voltage
V
KA
(V)
5
2006-11-06
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