TA76432AFT/AF/AFR/AS
TOSHIBA Bipolar Linear Integrated Circuit
Silicon Monolithic
TA76432AFT,TA76432AF,TA76432AFR,TA76432AS
1.26-V Adjustable High-Precision Shunt Regulators
The TA76432 series consists of adjustable high-precision shunt
regulators whose output voltage (V
KA
) can be set arbitrarily
using two external resistors.
These devices have a precise internal reference voltage of 1.26 V,
enabling them to operate at low voltage.
The devices are ideal for use as error amplifiers in 3-V
switching-regulator systems. In addition, they can be used as
zener diodes to perform temperature compensation.
TA76432AFT
Features
•
•
•
•
•
•
Precision reference voltage: V
REF
= 1.26 V ± 1% (Ta = 25°C)
Small temperature coefficient: |αV
REF
| = 30 ppm/°C (typ.)
Adjustable output voltage: V
REF
≤
V
OUT
≤
19 V
Minimum cathode current for regulation:
I
kmin
= 0.5 mA (max.)
Operating temperature: Ta =
−40~85°C
Packages: UFV (TA76432AFT),
PW-MINI (TA76432AF/AFR) and
TO-92MOD (TA76432AS)
The TA76432AFT is housed in an ultra-thin UFV package.
(thickness: 0.7 mm typ.)
TA76432AF/AFR
•
TA76432AS
Weight
SSOP5-P-0.65C : 0.007 g (typ.)
HSOP3-P-1.50 : 0.05 g (typ.)
SSIP3-P-1.27
: 0.36 g (typ.)
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2006-11-07
TA76432AFT/AF/AFR/AS
Pin Assignment/Marking
TA76432AFT
5
4
1: NC
2: ANODE (A)
3: CATHODE (K)
4: REFERENCE (REF)
5: ANODE (A)
3
1
2
3
Type marking
(two-digit number)
TA76432AF/AFR
Lot No. (three-digit number)
A line indicates
lead (Pb)-free package or
lead (Pb)-free finish.
Lot No.
⇒
The week of manufacture
⇒
The year of manufacture
(last decimal digit of the year of
manufacture)
2A
1
2
TA76432AS
1
2
3
TA76
432AS
1: REFERENCE (REF)
2: ANODE (A)
3: CATHODE (K)
A line indicates
lead (Pb)-free package or
lead (Pb)-free finish.
•TA76432AF: AF
•TA76432AFR: BF
No.
1
2
3
TA76432AF
CATHODE (K)
ANODE (A)
REFERENCE
(REF)
TA76432AFR
REFERENCE
(REF)
ANODE (A)
CATHODE (K)
Lot No: The last decimal digit of the year of manufacture followed by the month as
letters A to L of the alphabet.
For example: Jan-2004 is coded as “4A”
Note: TA76432AFvs.TA76432AFR:
reverse pin connection.
How to Order
Product No.
TA76432AFT (TE85L)
TA76432AF/AFR
TA76432AF/AFR (TE12L)
TA76432AS
TA76432AS (TPE6)
Package Type
UFV
(surface-mount type)
PW-MINI (SOT-89)
(surface-mount type)
TO-92MOD
(lead type)
Packing Type and Capacity
Embossed tape: 3000/tape
On cut tape (TE12L): 100/tape section
Embossed tape: 1000/tape
Loose in bag: 200/bag
Radial tape: 2000/tape
Minimum Order
1 tape
100
1 tape
1 bag
1 tape
Note: The lead pitch for the TA76432AS and TA76432AS (TPE6) may vary.
Functional Block Diagram
Cathode (K)
Circuit Symbol
Cathode (K)
Reference (REF)
Reference (REF)
1.26 V
Anode (A)
Anode (A)
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2006-11-07
TA76432AFT/AF/AFR/AS
Typical Application Circuits
1.26 V Reference (V
KA
=
V
REF
)
V
IN
V
OUT
=
1.26 V
Shunt regulator (V
KA
>
V
REF
)
V
IN
R1
V
OUT
R2
V
REF
Precautions during Use
(1)
⎛
R
⎞
⎜
V
OUT
=
V
REF
⎜
1
+
1
⎟ +
I
REF
⋅
R1
R
2
⎟
⎝
⎠
TA76432AFT, TA76432AF/AFR, TA76432AS
These products contain MOS elements. Please take care to avoid generating static electricity when
handling these devices.
TA76432AFT, TA76432AF/AFR, TA76432AS
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.
Precautions when handling anode pin of TA76432AFT
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.
(2)
(3)
Absolute Maximum Ratings
(Ta
=
25°C)
Characteristics
Cathode voltage
Cathode current
Cathode-anode reverse current
Reference voltage
Reference current
Reference-anode reverse current
TA76432AFT
Power dissipation TA76432AF/AFR
TA76432AS
TA76432AFT
Thermal
resistance
TA76432AF/AFR
TA76432AS
Operating temperature
Junction temperature
Storage temperature
T
opr
T
j
T
stg
R
th
P
D
Symbol
V
KA
I
K
−I
K
V
REF
I
REF
−I
REF
Rating
20
20
10
7
50
10
0.45 (Note 1)
0.5
0.8
277 (Note 1)
250
156
−40∼85
150
−55∼150
ºC
ºC
ºC
2
ºC/W
W
Unit
V
mA
mA
V
μA
mA
Note 1: Glass epoxy board 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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2006-11-07
TA76432AFT/AF/AFR/AS
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
15
85
Unit
V
mA
°C
⎯
⎯
⎯
Electrical Characteristics
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
(Unless otherwise specified, Ta
=
25°C, I
K
=
5 mA)
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
<
85°C, V
KA
=
V
REF
=
=
V
REF
<
V
KA
<
5 V
=
=
5 V
<
V
KA
<
19 V
=
=
V
KA
=
V
REF
0°C
<
Ta
<
85°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
<
15 mA
= =
Test Condition
Min
1.247
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Typ.
1.26
3
0.5
0.3
2
0.3
0.2
⎯
0.2
Max
1.273
15
2.5
2.0
4
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.
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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2006-11-07
TA76432AFT/AF/AFR/AS
P
Dmax
– Ta
0.6
P
Dmax
– Ta
1.2
(W)
: 30
×
30
×
0.8 mm t
0.5
Cupper pad area: 35 mm
2
(W)
TA76432AFT
Mounted on glass epoxy substate
TA76432AF, AFR
①
Mounted on ceramic substate
: 15
×
15
×
0.8 mm t
②
Ta
=
25°C
Allowable power dissipation P
Dmax
Allowable power dissipation P
Dmax
160
1.0
0.4
0.8
0.3
0.6
0.2
0.4
0.1
0.2
0
0
20
40
60
80
100
120
140
0
0
20
40
60
80
100
120
140
160
Ambient temperature Ta (°C)
Ambient temperature Ta (°C)
P
Dmax
– Ta
1.0
I
K
– V
KA
20
Input
VKA
IK
10
Allowable power dissipation P
Dmax
(W)
TA76432AS
I
K
(mA)
0.8
0.6
VKA
=
VREF
Ta
=
25°C
0.4
Cathode current
0
85°C
25°C
Ta
= −40°C
0.2
0
0
20
40
60
80
100
120
140
160
−10
−1.0
−0.5
0
0.5
1.0
1.5
Ambient temperature Ta (°C)
Cathode voltage
V
KA
(V)
I
K
– V
KA
300
Input
VKA
1.29
V
REF
– Ta
VKA
=
VREF
VKA
Input
VREF
IK
Reference voltage V
REF
(V)
(μA)
200
VKA
=
VREF
100
Ta
=
25°C
IK
IK min
IK
=
5 mA
1.28
I
K
1.27
Cathode current
1.26
25°C
0
Ta
=
−40°C
85°C
−100
−1.0
−0.5
0
85°C
Ta
= −40°C
25°C
1.25
0.5
1.0
1.5
1.24
−80
−40
0
40
80
120
160
Cathode voltage
V
KA
(V)
Ambient temperature Ta (°C)
5
2006-11-07
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