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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 (VKA) 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 : VREF = 2.49V 1.0% (Ta = 25C) Adjustable output voltage : VREF VOUT 19 V Minimum cathode current for regulation :Ikmin = 0.5 mA (max.) Operating temperature: Ta = -40~85C 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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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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Typical Application Circuits
(1) 2.49 V Reference (VKA = VREF)
VIN VOUT = 2.49 V
(2) Shunt regulator (VKA > VREF)
VIN R1 VOUT
R2
VREF
R VOUT = VREF 1 + 1 + IREF R1 R2
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 = 25C)
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 VKA IK -IK VREF IREF -IREF PD Rating 20 50 50 7 50 10 0.45 (Note 1) 0.8 277 (Note 1) 156 -4085 150 -55150 Unit V mA mA V A mA W
Rth Topr Tj Tstg
C/W C C C 2
Operating temperature Junction temperature Storage temperature
Note 1: Glass epoxy substrate 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 40 85 Unit V mA C

Electrical Characteristics (Unless otherwise specified, Ta = 25C, IK = 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 VREF VREF (dev) VREF/V IREF IREF (dev) IKmin IKoff ZKA VKA = VREF 0C < Ta < 70C, VKA = VREF = = VREF < VKA < 10 V = = 10V < VKA < 19 V = = VKA = VREF 0C < Ta < 70C, VKA = VREF, = = R1 = 10 k, R2 = VKA = VREF VKA = 19 V, VREF = 0 V VKA = VREF, f < 1 kHz, = 0.5 mA < IK < 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 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(Ta=0 to 70). 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
1.0
(W)
: 30 x 30 x 0.8 mm t 0.5 Cupper pad area: 35 mm2
Allowable power dissipation PDmax
Allowable power dissipation PDmax
(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)
IK - VKA
50 Input IK VKA 600 Input
IK - VKA
VKA IK 400 VKA = VREF Ta = 25C 200 85C 0 85C 25C Ta = -40C -200 -1.0 -0 1.0 Ta = -40C 25C IK min
(mA)
20
VKA = VREF Ta = 25C
IK
Cathode current
0
-20
85C 25C Ta = -40C
-50 -1.0
0
1.0
2.0
3.0
Cathode current
IK
(A)
2.0
3.0
Cathode voltage
VKA
(V)
Cathode voltage
VKA
(V)
VREF - Ta
2.53 2.53 VVKA = VREF KA = VREF Input Inpu IKK = 10 mA I = 10 mA 2.51 2.51 VVREF REF
VREF - VKA Change in reference voltage VREF (mV)
VVKA KA IKK I 0
Reference voltage VREF (V)
-10
2.49 2.49
Input -20 VREF
VKA IK
2.47 2.47
R2
R1
IK = 10 mA Ta = 25C
2.45 2.45 -50 -50
00
50 50
100 100
150
-30 0
5
10
15
20
25
Ambient temperature Ta (C)
Cathode voltage
VKA
(V)
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1.0 1.0
IREF - Ta
100 50 220 IK eo RS
ZKA - f
eo = ei KA Z RS + ZKA ei Z KA RS
ZKA ()
IREF (A)
0.8 0.8
30
RS ZKA eo =
10 5 GND
Reference current
Dynamic impedance
0.6 0.6
ei
e R ZKA = o S ei
0.4 0.4
Input Input 10k 10k
VKA VKA IIK K
3 Ta = 25C VKA = VREF 0.5 mA -IK 50mA 1 0.5 0.3 0.1 1k
0.2 0.2
IIREF REF IIK = 10 mA K = 10 mA
0 0 -50 -50
0 0
50 50
100 100
150 150
10 k
100 k
1M
10 M
Ambient temperature Ta (C)
Frequency f
(Hz)
AV - f
60 10 k IK VOUT 220 5 0
Pulse response
Input Input monitor Pulse Generator f = 100 kHz GND 3 2 1 0 Output 50 4 220 Output
AV (dB)
50
10 F VIN
10 k
40
GND
Open loop voltage gain
30
IK = 10 mA Ta = 25C
20
10
0 1k
10 k
100 k
1M
10 M
Voltage swing ()
0
1
2
3
5
6
Frequency f
(Hz)
Time t (s)
Stability boundaty conditions
50
(mA)
40
IK CL
IK Cathode current
30 Unstable 20 Stable Ta = 25C
VKA = VREF(2.49V)15V
10
0 0.0001
0.001
0.01
0.1
1
10
100
Load capacitance CL (F)
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Package Dimensions
TA76L431FT (UFV) Weight: 0.007 g (typ.)
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Package Dimensions
TA76L431S (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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