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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 (VKA) 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: VREF = 1.26 V 1% (Ta = 25C) Small temperature coefficient: |VREF| = 30 ppm/C (typ.) Adjustable output voltage: VREF VOUT 19 V Minimum cathode current for regulation: Ikmin = 0.5 mA (max.) Operating temperature: Ta = -40~85C 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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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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Typical Application Circuits
1.26 V Reference (VKA = VREF) VIN VOUT = 1.26 V Shunt regulator (VKA > VREF) VIN R1
VOUT
R2
VREF
Precautions during Use
(1)
R VOUT = VREF 1 + 1 + IREF R1 R2
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 = 25C)
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 Topr Tj Tstg Rth PD Symbol VKA IK -IK VREF IREF -IREF Rating 20 20 10 7 50 10 0.45 (Note 1) 0.5 0.8 277 (Note 1) 250 156 -4085 150 -55150 C C C 2 C/W W Unit V mA mA V A mA
Note 1: Glass epoxy board mounting: 30 mm x 30 mm x 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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Recommended Operating Conditions
Characteristics Cathode voltage Cathode current Operating temperature Symbol VKA IK Topr Min VREF 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 = 25C, IK = 5 mA)
Symbol VREF VREF (dev) VREF/V IREF IREF (dev) IKmin IKoff ZKA VKA = VREF 0C < Ta < 85C, VKA = VREF = = VREF < VKA < 5 V = = 5 V < VKA < 19 V = = VKA = VREF 0C < Ta < 85C, VKA = VREF, = = R1 = 10 k, R2 = VKA = VREF VKA = 19 V, VREF = 0 V VKA = VREF, f < 1 kHz, = 0.5 mA < IK < 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 A A mA A
The deviation parameters VREF (dev) and IREF (dev) are defined as the maximum variation of the VREF and IREF over the rated temperature range. The average temperature coefficient of the VREF is defined as:
VREF max VREF (dev) min
6 V REF (dev) x 10 V REF @25C VREF = Ta
(ppm C )
Ta
Application Circuit Example
Error amplification circuit for switching power supply
Photocoupler VOUT
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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PDmax - Ta
0.6
PDmax - Ta
1.2
(W)
: 30 x 30 x 0.8 mm t 0.5 Cupper pad area: 35 mm2
(W)
TA76432AFT
Mounted on glass epoxy substate
TA76432AF, AFR
Mounted on ceramic substate : 15 x 15 x 0.8 mm t Ta = 25C
Allowable power dissipation PDmax
Allowable power dissipation PDmax
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)
PDmax - Ta
1.0
IK - VKA
20 Input VKA IK 10
Allowable power dissipation PDmax
(W)
TA76432AS
IK
(mA)
0.8
0.6
VKA = VREF Ta = 25C
0.4
Cathode current
0 85C 25C Ta = -40C
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
VKA
(V)
IK - VKA
300 Input VKA 1.29
VREF - Ta
VKA = VREF VKA Input VREF IK
Reference voltage VREF (V)
(A)
200 VKA = VREF 100 Ta = 25C
IK
IK min
IK = 5 mA 1.28
IK
1.27
Cathode current
1.26
25C 0 Ta = -40C 85C -100 -1.0 -0.5 0
85C
Ta = -40C 25C
1.25
0.5
1.0
1.5
1.24 -80
-40
0
40
80
120
160
Cathode voltage
VKA
(V)
Ambient temperature Ta (C)
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VREF - VKA
0 4.0 Input -2
IREF - Ta
VKA 10k IK
Change in reference voltage VREF (mV)
IREF (A)
3.0
IREF IK = 5 mA 2.0
-4
-6
Input
VKA IK
VREF -8
Reference current
15 20
R1
1.0
R2
IK = 5 mA Ta = 25C
-10 0
5
10
0.0 -40
0
40
80
120
160
Cathode voltage
VKA
(V)
Ambient temperature Ta (C)
ZKA - f
100 50 220 IK 60 eo RS
eo = ei KA Z RS + ZKA ei RS KA Z
AV - f
10 k IK VOUT 220 GND 10 M
AV (dB)
ZKA ()
30
RS ZKA eo =
50 40 30 20 10 0 -10 1k
10 F VIN
10 5 3 GND
Open loop voltage gain
ei
Dynamic impedance
e R ZKA = o S ei
1 0.5 0.3 0.1 1k
Ta = 25C VKA = VREF 0.5 mA -IK 15 mA
IK = 5 mA Ta = 25C
10 k
100 k
1M
10 k
100 k
Frequency f
(Hz)
Frequency f
(Hz)
Pulse response
5 0 Input Input monitor Pulse Generator f = 100 kHz GND 1.5 1.0 0.5 0 0 1 2 3 4 5 6 Output 50 220 Output
Voltage swing ()
Time t (s)
10 k 1M
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Stability boundary conditions
20
(mA)
IK 15 CL
Cathode current
IK
10
Unstable
Stable
Ta = 25C VKA = VREF
5
0 0.001
0.003
0.01
0.03
0.1
0.3
1
3
5
10
30
100
Load capacitance CL (F)
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Package Dimensions
TA76432AFT (UFV) Weight: 0.007 g (typ.)
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Package Dimensions
TA76432AF/AFR (PW-MINI) Weight: 0.05 g (typ.)
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Package Dimensions
TA76432AS (TO-92MOD) Weight: 0.36 g (typ.)
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RESTRICTIONS ON PRODUCT USE
* The information contained herein is subject to change without notice.
20070701-EN
* TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.).These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in his document shall be made at the customer's own risk. * The products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA for any infringements of patents or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any patents or other rights of TOSHIBA or the third parties. * Please contact your sales representative for product-by-product details in this document regarding RoHS compatibility. Please use these products in this document in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances. Toshiba assumes no liability for damage or losses occurring as a result of noncompliance with applicable laws and regulations.
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