TLA431_V02 TI | Alldatasheet
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TLA431, TLA432 All-Capacitor Stable Precision Programmable Reference
1 Features
- No output capacitor required
- Stable with all capacitive loads
- Reference voltage tolerance at 25°C – 1% (A grade)
- Adjustable output voltage: Vref to 36V
- Operation from −40°C to 125°C
- Typical temperature drift (TLA43xA) – 8mV (I temp) – 11mV (Q temp)
- Low Output Noise
- 0.2Ω Typical output impedance
- Sink-current capability: 0.2mA to 100mA
- Pin-compatible with industry-standard TL431 and TL432
2 Applications
- Rack server power
- Industrial AC/DC
- AC inverter & VF drives
- Servo drive control module
- Notebook PC power adapter design Vref Input VKA IKA Simplified Schematic
3 Description
The TLA431 and TLA432 devices are three-terminal adjustable shunt regulators that are stable with all capacitor loads. The devices are pin compatible with the industry standard TL431 and TL432 but with improved stability to support all capacitor loads. The output cathode voltage can be set to any value between V ref (2.495V) and 36V, with two external resistors. These devices have a typical output impedance of 0.2 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TLA431 also functions as a comparator for undervoltage monitoring. The internal amplifier and reference of the TLA431 is used an error amplifier in isolated optocoupler flyback power supplies. The TLA432 device has exactly the same functionality and electrical specifications as the TLA431 device. The TLA431 and TLA432 devices are specified in two temperature grades, I and Q. In addition, the devices offer good stability reference voltage over the entire temperature range. Device Information PART NUMBER (1) PACKAGE (PIN) (2) BODY SIZE (NOM) TLA431 SOT23-3 2.90mm × 1.30mm TLA432 SOT23-3 2.90mm × 1.30mm TLA431(3) SOT5X3 (6) 1.20mm x 1.60mm (1) For all available packages, see the orderable addendum at the end of the data sheet. (2) The package size (length × width) is a nominal value and includes pins, where applicable. (3) Product Preview TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
10.3 Receiving Notification of Documentation Updates..22
12 Mechanical, Packaging, and Orderable
TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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4 Device Comparison Table
DEVICE PINOUT INITIAL ACCURACY OPERATING FREE-AIR TEMPERATURE (TA) TLA431 TLA432 A: 1% I: -40°C to 85°C Q: -40°C to 125°C
5 Pin Configuration and Functions
Figure 5-1. DBZ Package, 3-Pin SOT-23, TLA431 (Top View) ANODE CATHODE REF Figure 5-2. DBZ Package, 3-Pin SOT-23, TLA432 (Top View) CATHODE DNC NC NC REF ANODE Figure 5-3. DRL Package, 6-Pin SOT-563, TLA431 (Top View) PRODUCT PREVIEW Table 5-1. Pin Functions PIN TYPE DESCRIPTION NAME TLA431 TLA432 DBZ DRL DBZ CATHODE 1 1 2 I/O Shunt Current/Voltage input REF 2 5 1 I Threshold relative to common anode ANODE 3 6 3 O Common pin, normally connected to ground NC - 3, 4 - - No connect DNC - 2 - - Do not connect www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 3 Product Folder Links: TLA431 TLA432
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1) MIN MAX UNIT VKA Cathode Voltage(2) 37 V IKA Continuous Cathode Current Range –100 150 mA II(ref) Reference Input Current –0.05 10 mA TJ Operating Junction Temperature Range –40 150 C Tstg Storage Temperature Range –65 150 C (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) All voltage values are with respect to ANODE, unless otherwise noted.
6.2 ESD Ratings
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001pins(1) ±2000 VCharged-device model (CDM), per JEDEC specification JESD22- ±1000 VC101(2) ±1000 (1) JEDEC document JEP155 states that 500V HBM allows safe manufacturing with a standard ESD control process. (2) JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
See (1) MIN MAX UNIT VKA Cathode Voltage VREF 36 V IKA Continuous Cathode Current Range 0.2 100 mA TA Operating Free-Air Temperature TLA43xxI –40 85 C TLA43xxQ –40 125 C (1) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
6.4 Thermal Information
THERMAL METRIC(1) TLA43x UNITDBZ
3 PINS
RθJA Junction-to-ambient thermal resistance 218.8 C/W RθJC(top) Junction-to-case (top) thermal resistance 115.8 C/W RθJB Junction-to-boardthermal resistance 53.1 C/W ψJT Junction-to-top characterization resistance 16.6 C/W ψJB Junction-to-board characterization resistance 52.6 C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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6.5 Electrical Characteristics
over recommended operating conditions, TA = 25°C (unless otherwise noted) PARAMETER TEST CIRCUIT TEST CONDITIONS MIN TYP MAX UNIT Vref Reference Voltage See Figure 7-1 VKA = Vref, IKA = 10mA TLA43xAx devices 2470 2495 2520 mV VI(dev) Deviation of reference input voltage over full temperature range (1) See Figure 7-1 VKA = Vref, IKA = 10mA, –40°C < TJ < 85°C TLA43xxI devices 8 17 mV VI(dev) Deviation of reference input voltage over full temperature range (1) See Figure 7-1 VKA = Vref, IKA = 10mA, –0°C < TJ < 90°C TLA43xxQ devices 5 13 mV VI(dev) Deviation of reference input voltage over full temperature range (1) See Figure 7-1 VKA = Vref, IKA = 10mA, –40°C < TJ < 125°C TLA43xxQ devices 11 20 mV ΔVref / ΔVKA Ratio of change in reference voltage to the change in cathode voltage See Figure 7-2 IKA = 10mA ΔVKA = 10V - Vref –1.4 –2.7 mV/V ΔVKA = 36V - 10V –1 –2 mV/V Iref Reference Input Current See Figure 7-2 IKA = 10mA, R1 = 10kΩ, R2 = ∞ 2 4 µA II(dev) Deviation of reference input current over full temperature range (1) See Figure 7-2 IKA = 10mA, R1 = 10kΩ, R2 = ∞ 0.8 2.5 µA Imin Minimum cathode current for regulation See Figure 7-1 VKA = Vref 0.15 0.2 mA Ioff Off-state cathode current See Figure 7-3 VKA = 36V, Vref = 0 0.1 0.5 µA |ZKA| Dynamic Impedance (2) See Figure 7-1 VKA = Vref, IKA = 1mA to 100mA 0.2 0.5 Ω (1) The deviation parameters VI(dev) and II(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. For more details on VI(dev) and how it relates to the average temperature coefficient, see Parameter Measurement Information. (2) The dynamic impedance is defined by |ZKA| = ΔVKA/ΔIKA. For more details on |ZKA| and how it relates to VKA, see Parameter Measurement Information. www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 5 Product Folder Links: TLA431 TLA432
6.6 Typical Characteristics
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices. T A - F r e e - A i r T e m p e r a t u r e - ° C V ref - Reference Voltage - V - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 2 . 4 8 4 2 . 4 8 6 2 . 4 8 8 2 . 4 9 2 . 4 9 2 2 . 4 9 4 2 . 4 9 6 2 . 4 9 8 2 . 5 2 . 5 0 2 2 . 5 0 4 V K A = V r e f I K A = 1 0 m A Figure 6-1. Reference Voltage vs Free-Air Temperature −50 −75 −100 125 −25 −2 −1 0 1 100 150 2 3 VKA − Cathode Voltage − V VKA = Vref TA = 25°C − Cathode Current − mA IKA Figure 6-2. Cathode Current vs Cathode Voltage V K A - C a t h o d e V o l t a g e - V I KA - Cathode Current - A 0 0 . 5 1 1 . 5 2 2 . 5 - 5 0 5 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 3 5 0 4 0 0 V K A = V r e f Figure 6-3. Cathode Current vs Cathode Voltage −1.15 −1.25 −1.35 −1.45 −1.05 − 0.95 − 0.85 TA − Free-Air Temperature − °C −75 −25 0 50 100 125−50 25 75 VKA = 3 V to 36 V − mV/V ref KA Figure 6-4. Ratio of Delta Reference Voltage to Delta Cathode Voltage vs Free-Air Temperature TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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C L - L o a d C a p a c i t a n c e - F I KA - Cathode Current - mA 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 V K A = V r e f V K A = 5 V V K A = 1 0 V V K A = 1 5 V S t a b l e Figure 6-11. Stability Boundary Conditions 150 Ω IKA R1 = 10 kΩ CL VBATT IKA CL VBATT 150 Ω TEST CIRCUIT FOR CURVE A TEST CIRCUIT FOR CURVES B, C, AND D − + Figure 6-12. Test Circuit for Stability Boundary Conditions TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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7 Parameter Measurement Information
Figure 7-1. Test Circuit for VKA = Vref Ir ef IKA VKAInput Vref KA ref ref R1V = V 1 + + I × R1R2 /c230 /c246 /c231 /c247 /c232 /c248 Figure 7-2. Test Circuit for VKA > Vref Ioff VKAInput Figure 7-3. Test Circuit for Ioff
7.1 Temperature Coefficient
The deviation of the reference voltage, V ref, over the full temperature range is known as V I(dev). The parameter of V I(dev) can be used to find the temperature coefficient of the device. The average full-range temperature coefficient of the reference input voltage, αVref, is defined as: αVref is positive or negative, depending on whether minimum V ref or maximum V ref, respectively, occurs at the lower temperature. The full-range temperature coefficient is an average and therefore any subsection of the rated operating temperature range can yield a value that is greater or less than the average. For more details on temperature coefficient, refer to the Voltage Reference Selection Basics White Paper. www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 9 Product Folder Links: TLA431 TLA432
7.2 Dynamic Impedance
The dynamic impedance is defined as KA KA KA VZ I ' ' . When the device is operating with two external resistors (see Figure 6-8), the total dynamic impedance of the circuit is given by Vz ' I ' ' , which is approximately equal to KA R1Z 1 R2 § · ¨ ¸ © ¹ The V KA of the device can be affected by the dynamic impedance. The device test current I test for V KA is specified in the Electrical Characteristics. Any deviation from I test can cause deviation on the output V KA. Figure 7-4 shows the effect of the dynamic impedance on the VKA. Ps
0 VKA (V)
IKA (mA) Itest IKA(min) IKA Figure 7-4. Dynamic Impedance TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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8 Detailed Description
8.1 Overview
The TLA431 and TLA432 devices are three-terminal adjustable shunt regulators that are stable with all capacitor loads. This standard device has proven ubiquity and versatility across a wide range of applications, ranging from power to signal path. This device is pin compatible with the industry standard TL431. The TLA431 contains an accurate voltage reference & op amp, which are very fundamental analog building blocks. TLA431 has improved the stability for capacitive loads. TLA431 is used in conjunction with external components to behave as a single voltage reference, error amplifier, current sink, voltage clamp or comparator with an integrated reference. TLA431 can be operated and adjusted to cathode voltages from 2.495V to 36V, making this part optimum for a wide range of end equipment in industrial, auto, telecom & computing. For this device to behave as a shunt regulator or error amplifier, >0.2mA (I min(max)) must be supplied in to the cathode pin. Under this condition, feedback can be applied from the Cathode and Ref pins to create a replica of the internal reference voltage. The TLA432 device has exactly the same functionality and electrical specifications as the TLA431 device. The TLA43xAI devices are characterized for operation from –40°C to 85°C, and the TLA43xAQ devices are characterized for operation from –40°C to 125°C.
8.2 Functional Block Diagram
Figure 8-1. Equivalent Schematic www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 11 Product Folder Links: TLA431 TLA432
8.3 Feature Description
TLA431 consists of an internal reference and amplifier that outputs a sink current base on the difference between the reference pin and the virtual internal pin. The sink current is produced by the internal Darlington pair. A Darlington pair is used for this device to be able to sink a maximum current of 100mA. When operated with enough voltage headroom ( ≥ 2.495V) and cathode current (I KA), TLA431 forces the reference pin to 2.495V. However, the reference pin can not be left floating, as the reference pin needs I REF ≥ 4µA (please see Electrical Characteristics ). This is because the reference pin is driven into an npn, which needs base current in order operate properly. When feedback is applied from the Cathode and Reference pins, TLA431 behaves as a Zener diode, regulating to a constant voltage dependent on current being supplied into the cathode. This is due to the internal amplifier and reference entering the proper operating regions. The same amount of current needed in the above feedback situation must be applied to this device in open loop, servo or error amplifying implementations for the TLA431 to be in the proper linear region giving the TLA431 enough gain. TLA431 is internally compensated to be stable without an output capacitor between the cathode and anode.
8.4 Device Functional Modes
8.4.1 Closed Loop
When the cathode/output voltage or current of TLA431 is being fed back to the reference/input pin in any form, this device is operating in closed loop. The majority of applications involving TLA431 use the TLA431 in this manner to regulate a fixed voltage or current. The feedback enables this device to behave as an error amplifier, computing a portion of the output voltage and adjusting the cathode to maintain the desired regulation. This is done by relating the output voltage back to the reference pin in a manner to make the reference pin equal to the internal reference voltage, which can be accomplished via resistive or direct feedback.
8.4.1.1 Stability (Closed Loop)
TLA431 is internally compensated to be stable without an output capacitor between the cathode and anode as shown in Figure 8-2. The TLA431 is also stable across all capacitive loads from cathode to anode. This includes the popular 0.1µF capacitor load. The TLA431 has been tested to have stable operation with no capacitive loads up to capacitors larger than 10µF. See Figure 6-11 for stability chart and test setup. TLA431 CATHODE ANODE REF 0.1% 0.1% CL Vref VSUP RSUP VO=(1+R1 )Vref Figure 8-2. TLA431 with load capacitor The TLA431 is sensitive to capacitance on the REF pin when the REF is isolated from cathode. For stable voltage regulation, do not add capacitance to the REF pin as shown in Figure 8-3. TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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Figure 8-3. TLA431 with capacitor on REF pin
8.4.2 Open Loop (Comparator)
When the cathode/output voltage or current of TLA431 is not being fed back to the reference/input pin in any form, this device is operating in open loop. With proper cathode current (Ika) applied to this device, TLA431 has the characteristics shown in Figure 9-4. With such high gain in this configuration, TLA431 is typically used as a comparator. With the reference integrated makes TLA431 the prefered choice when users are trying to monitor a certain level of a single signal. www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 13 Product Folder Links: TLA431 TLA432
9 Applications and Implementation
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
9.1 Application Information
As this device has many applications and setups, there are many situations that this data sheet can not characterize in detail. setting the shunt voltage to achieve optimum accuracy for this device.
9.2 Typical Applications
9.2.1 Shunt Regulator/Reference
0.1% 0.1% CL Vref VSUP RSUP VO=(1+R1 )Vref Figure 9-1. Shunt Regulator Schematic
9.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 9-2 as the input parameters. Table 9-1. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Reference Initial Accuracy 1.0% Supply Voltage 24V Cathode Current (Ik) 5mA Output Voltage Level 2.5V - 36V Load Capacitance 0.1μF Feedback Resistor Values and Accuracy (R1 & R2) 10kΩ
9.2.1.2 Detailed Design Procedure
When using TLA431 as a Shunt Regulator, determine the following:
- Input Voltage Range
- Temperature Range
- Total Accuracy
- Cathode Current
- Reference Initial Accuracy
- Output Capacitance
9.2.1.2.1 Programming Output/Cathode Voltage
To program the cathode voltage to a regulated voltage a resistive bridge must be shunted between the cathode and anode pins with the mid point tied to the reference pin. This can be seen in Figure 9-1, with R1 & R2 being TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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the resistive bridge. The cathode/output voltage in the shunt regulator configuration can be approximated by the equation shown in Figure 9-1. The cathode voltage can be more accuratel determined by taking in to account the cathode current: Vo=(1+R1/R2)*VREF-IREF*R1 For this equation to be valid, TLA431 must be fully biased so that the TLA431 has enough open loop gain to mitigate any gain error. This can be done by meeting the Imin spec denoted in Electrical Characteristics.
9.2.1.2.2 Total Accuracy
When programming the output above unity gain (V KA=VREF), TLA431 is susceptible to other errors that can effect the overall accuracy beyond VREF. These errors include:
- R1 and R2 accuracies
- VI(dev) - Change in reference voltage over temperature
- ΔVREF / ΔVKA - Change in reference voltage to the change in cathode voltage
- |zKA| - Dynamic impedance, causing a change in cathode voltage with cathode current Worst case cathode voltage can be determined taking all of the variables in to account. Application note Setting the Shunt Voltage on an Adjustable Shunt Regulator (SLVA445) assists designers in setting the shunt voltage to achieve optimum accuracy for this device.
9.2.1.2.3 Start-Up Time
As shown in Figure 9-2, TLA431 has a fast response up to about 2V and then slowly charges to the programmed value.
9.2.1.3 Application Curve
Time (s) Voltage (V) D001 Vsup Vka=Vref R1=10k: & R2=10k: R1=38k: & R2=10k: Figure 9-2. TLA431Start-Up Response www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 15 Product Folder Links: TLA431 TLA432
9.2.2 Comparator With Integrated Reference
2.5V CATHODE ANODE REFVIN Vout Vsup Rsup VL RIN Figure 9-3. Comparator Application Schematic TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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9.2.2.1 Design Requirements
For this design example, use the parameters listed in Table 9-2 as the input parameters. Table 9-2. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Input Voltage Range 0V to 5V Input Resistance 10kΩ Supply Voltage 24V Cathode Current (Ik) 5mA Output Voltage Level 2V – VSUP Logic Input Thresholds VIH/VIL VL
9.2.2.2 Detailed Design Procedure
When using TLA431 as a comparator with reference, determine the following:
- Input Voltage Range
- Reference Voltage Accuracy
- Output logic input high and low level thresholds
- Current Source resistance
9.2.2.2.1 Basic Operation
In the configuration shown in Figure 9-3 TLA431 behaves as a comparator, comparing the V REF pin voltage to the internal virtual reference voltage. When provided a proper cathode current (I K), TLA431 has enough open loop gain to provide a quick response. This can be seen in Figure 9-4 , where the R SUP=10kΩ ( IKA=500µA) situation responds much slower than RSUP=1kΩ (IKA=5mA). Operation near and below Imin can result in low gain, leading to a slow response. Slow or inaccurate responses can also occur when the reference pin is not provided enough overdrive voltage. This is the amount of voltage that is higher than the internal virtual reference. The more overdrive voltage provided, the faster the TLA431 response. For applications where TLA431 is being used as a comparator, good design practice is to set the trip point to greater than the positive expected error (i.e. +1.0% for the A version). For fast response, setting the trip point to >10% of the internal VREF can suffice. For minimal voltage drop or difference from Vin to the ref pin, use an input resistor <10kΩ to provide Iref. www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 17 Product Folder Links: TLA431 TLA432
9.2.2.2.2 Output Voltage and Logic Input Level
For the TLA431 to properly be used as a comparator, the logic output must be readable by the receiving logic device. This is accomplished by knowing the input high and low level threshold voltage levels, typically denoted by VIH & VIL. As seen in Figure 9-4, TLA431's output low level voltage in open-loop/comparator mode is approximately 2V, which is typically sufficient for 5V supplied logic. However, 5V does not work for 3.3V & 1.8V supplied logic.To accomodate this a resistive divider can be tied to the output to attenuate the output voltage to a voltage legible to the receiving low voltage logic device. TLA431's output high voltage is equal to V SUP due to TLA431 being open-collector. If V SUP is much higher than the receiving logic's maximum input voltage tolerance, the output must be attenuated to accomadate the outgoing logic's reliability. When using a resistive divider on the output, be sure to make the sum of the resistive divider (R1 & R2 in Figure 9-3) is much greater than RSUP to not interfere with TLA431's ability to pull close to VSUP when turning off. TLA431 requires an input resistance in this application to source the reference current (I REF) needed from this device to be in the proper operating regions while turing on. The actual voltage seen at the ref pin is VREF=VIN-IREF*RIN. Since IREF can be as high as 4µA, the recommendation is to use a resistance small enough that mitigate the error that IREF creates from VIN.
9.2.2.3 Application Curve
Time (s) Voltage (V) -0.5 0.5 1.5 2.5 3.5 4.5 5.5 D001 Vin Vka(Rsup=10k:) Vka(Rsup=1k:) Figure 9-4. Output Response With Various Cathode Currents TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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9.3 System Examples
0.1% 0.1% 0.01 µF 4.7 k R (see Note A) TLA431 VI(BATT) VO VO=(1+ R1 )Vref A. R is designed to provide cathode current ≥0.2mA to the TLA431 at minimum V(BATT). Figure 9-5. Precision High-Current Series Regulator TLA431 VSUP RSUP VO VO=(1+R1 )Vref Figure 9-6. High-Current Shunt Regulator TLA431 VSUP Rb (see Note A) VO VO=(1+ R1 )Vref A. Rb is designed to provide cathode current ≥0.2mA to the TLA431. Figure 9-7. Efficient Precision Regulator www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 19 Product Folder Links: TLA431 TLA432
(see Note A) LED on When Low Limit < Vsup < High Limit Low Limit = 1+ R1B R2B Vref High Limit = 1+ R1A R2A Vref A. Select R3 and R4 to provide the desired LED intensity and cathode current ≥0.2mA to the TLA431 at the available VSUP. Figure 9-8. Voltage Monitor TLA431 VSUP RCL 0.1% IO Iout= Vref RCL +IKA R1= Vsup IO hFE +IKA Figure 9-9. Precision Current Limiter TLA431 VSUP IO RS 0.1% IO=Vref RS Figure 9-10. Precision Constant-Current Sink
9.4 Power Supply Recommendations
When using TLA431 as a Linear Regulator to supply a load, designers typically use a bypass capacitor on the output/cathode pin. The TLA431 is stable with all capacitive loads. To not exceed the maximum cathode current, be sure that the supply voltage is current limited. Also, be sure to limit the current being driven into the Ref pin, as not to exceed the absolute maximum rating. For applications shunting high currents, pay attention to the cathode and anode trace lengths, adjusting the width of the traces to have the proper current density. TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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9.5 Layout
9.5.1 Layout Guidelines
Bypass capacitors need to be placed as close to the part as possible to limit ESR. Current-carrying traces need to have widths appropriate for the amount of current the traces are carrying; in the case of the TLA431, the currents are be low.
9.5.2 Layout Example
Figure 9-11. TLA431 DBZ Layout Example www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 21 Product Folder Links: TLA431 TLA432
10 Device and Documentation Support
10.1 Device Nomenclature
TI assigns suffixes and prefixes to differentiate all the combinations of the TLA43x family. The Eco Plan designator is a legacy designator that was used to differentiate Pb-free and Green devices. More details and possible orderable combinations are located on the Package Option Addendum in Mechanical, Packaging, and Orderable Information. TLA43X X X XXX X Part Number Opera ng Free-Air Temperature Package Type Package Quan ty Ini al Accuracy 1. TLA431 2. TLA432 (Alt Pin Out) A: 1% DBZ: SOT23-3 DRL: SOT5X3-6 I: -40°C to 85°C Q: -40°C to 125°C R: Reel
10.2 Related Links
The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy. Table 10-1. Related Links PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL DOCUMENTS TOOLS & SOFTWARE SUPPORT & COMMUNITY TLA431 Click here Click here Click here Click here Click here TLA432 Click here Click here Click here Click here Click here
10.3 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. Click on Notifications to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.
10.4 Support Resources
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight from the experts. Search existing answers or ask your own question to get the quick design help you need. Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.
10.5 Trademarks
TI E2E™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners.
10.6 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 www.ti.com
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Product Folder Links: TLA431 TLA432
10.7 Glossary
TI Glossary This glossary lists and explains terms, acronyms, and definitions. NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (July 2024) to Revision A (October 2024) Page
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical packaging and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser based versions of this data sheet, refer to the left hand navigation. www.ti.com TLA431, TLA432 SNVSCR4A – JULY 2024 – REVISED OCTOBER 2024 Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 23 Product Folder Links: TLA431 TLA432
www.ti.com 18-Nov-2024 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead finish/ Ball material (6) MSL Peak Temp (3) Op Temp (°C) Device Marking (4/5) Samples PTLA431AIDBZR ACTIVE SOT-23 DBZ 3 3000 TBD Call TI Call TI -40 to 85 Samples PTLA431AQDBZR ACTIVE SOT-23 DBZ 3 3000 TBD Call TI Call TI -40 to 125 Samples PTLA432AIDBZR ACTIVE SOT-23 DBZ 3 3000 TBD Call TI Call TI -40 to 85 Samples PTLA432AQDBZR ACTIVE SOT-23 DBZ 3 3000 TBD Call TI Call TI -40 to 125 Samples TLA431AIDBZR ACTIVE SOT-23 DBZ 3 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 3KVF Samples TLA431AQDBZR ACTIVE SOT-23 DBZ 3 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 3KWF Samples TLA432AIDBZR ACTIVE SOT-23 DBZ 3 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 3KXF Samples TLA432AQDBZR ACTIVE SOT-23 DBZ 3 3000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 125 3KZF Samples (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 1
www.ti.com 18-Nov-2024 (6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2
PACKAGE MATERIALS INFORMATION www.ti.com 18-Nov-2024 TAPE AND REEL INFORMATION Reel Width (W1) REEL DIMENSIONS A0B0K0WDimension designed to accommodate the component lengthDimension designed to accommodate the component thicknessOverall width of the carrier tapePitch between successive cavity centersDimension designed to accommodate the component width TAPE DIMENSIONSK0 P1B0WA0Cavity QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE Pocket QuadrantsSprocket HolesQ1Q1Q2Q2Q3Q3Q4Q4User Direction of Feed P1ReelDiameter *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Reel Diameter (mm) Reel Width W1 (mm) (mm) (mm) (mm) (mm) W (mm) Pin1 Quadrant Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION www.ti.com 18-Nov-2024 TAPE AND REEL BOX DIMENSIONS Width (mm) W LH *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TLA431AIDBZR SOT-23 DBZ 3 3000 210.0 185.0 35.0 TLA431AQDBZR SOT-23 DBZ 3 3000 210.0 185.0 35.0 TLA432AIDBZR SOT-23 DBZ 3 3000 210.0 185.0 35.0 TLA432AQDBZR SOT-23 DBZ 3 3000 210.0 185.0 35.0 Pack Materials-Page 2
www.ti.com PACKAGE OUTLINE C 0.20
0.08 TYP
0.25 2.64 2.10
1.12 MAX
0.10
0.01 TYP
3X 0.5 0.3 0.6
0.2 TYP
1.9 0.95 0 -8 TYP 4X 0 -15 4X 4 -15 A 3.04 2.80 B1.4 1.2 (0.95) (0.15) (0.125) SOT-23 - 1.12 mm max heightDBZ0003A SMALL OUTLINE TRANSISTOR 4214838/F 08/2024 NOTES: 1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M. 2. This drawing is subject to change without notice. 3. Reference JEDEC registration TO-236, except minimum foot length. 4. Support pin may differ or may not be present. 5. Body dimensions do not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed 0.25mm per side
0.2 C A B
0.1 C SCALE 4.000
www.ti.com EXAMPLE BOARD LAYOUT
0.07 MAX
0.07 MIN
3X (1.3) 3X (0.6) (2.1) 2X (0.95) (R0.05) TYP 4214838/F 08/2024 SOT-23 - 1.12 mm max heightDBZ0003A SMALL OUTLINE TRANSISTOR NOTES: (continued) 5. Publication IPC-7351 may have alternate designs. 6. Solder mask tolerances between and around signal pads can vary based on board fabrication site. SYMM LAND PATTERN EXAMPLE SCALE:15X PKG SOLDER MASK OPENING METAL UNDER SOLDER MASK SOLDER MASK DEFINED METALSOLDER MASK OPENING NON SOLDER MASK DEFINED (PREFERRED) SOLDER MASK DETAILS
www.ti.com EXAMPLE STENCIL DESIGN (2.1) 2X(0.95) 3X (1.3) 3X (0.6) (R0.05) TYP SOT-23 - 1.12 mm max heightDBZ0003A SMALL OUTLINE TRANSISTOR 4214838/F 08/2024 NOTES: (continued) 7. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations. 8. Board assembly site may have different recommendations for stencil design. SOLDER PASTE EXAMPLE BASED ON 0.125 THICK STENCIL SCALE:15X SYMM PKG
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