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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearTPS7A2045PDQNR
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TPS7A2045PDQNR - Texas Instruments

Manufacturer Part Number
TPS7A2045PDQNR
Manufacturer
Texas Instruments
Allelco Part Number
32D-TPS7A2045PDQNR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
267,220 pcs available, New & Original
Parts Description
300-MA, ULTRA-LOW-NOISE, LOW-IQ,
Package
4-X2SON (1x1)
Data sheet
TPS7A2045PDQNR.pdf

PCN Design/Specification

TPS7A20 17/Dec/2021.pdf
RoHs Status
 
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Our certification
In stock: 267220
  • Unit Price: $0.119
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
5+ $0.119 $0.60
50+ $0.116 $5.80
150+ $0.115 $17.25
500+ $0.113 $56.50
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

TPS7A2045PDQNR Tech Specifications
Texas Instruments - TPS7A2045PDQNR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - TPS7A2045PDQNR

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage Dropout (Max) 0.14V @ 300mA
Voltage - Output (Min/Fixed) 4.5V
Voltage - Output (Max) -
Voltage - Input (Max) 6V
Supplier Device Package 4-X2SON (1x1)
Series -
Protection Features Over Current, Over Temperature, Under Voltage Lockout (UVLO)
Package / Case 4-XDFN Exposed Pad
Package Tape & Reel (TR)
PSRR 65dB ~ 40dB (100Hz ~ 1MHz)
Product Attribute Attribute Value
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 125°C (TJ)
Number of Regulators 1
Mounting Type Surface Mount
Current - Supply (Max) 2 mA
Current - Quiescent (Iq) 15 µA
Current - Output 300mA
Control Features Enable
Base Product Number TPS7A2045

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status Not applicable
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

TPS7A2045PDQNR Image
TPS7A2045PDQNR (1)

Manufacturer Part Number

TPS7A2045PDQNR

Manufacturer

texas-instruments

Introduction

The TPS7A2045PDQNR is a high-performance, low-dropout (LDO) linear voltage regulator that provides a fixed 4.5V output voltage. It is designed to offer excellent line and load regulation, low quiescent current, and robust protection features, making it an ideal choice for a variety of power supply applications.

Product Features and Performance

Fixed 4.5V output voltage

Low dropout voltage of 0.14V at 300mA output current

Quiescent current of only 15μA

Maximum supply current of 2mA

Power supply rejection ratio (PSRR) of 65dB to 40dB from 100Hz to 1MHz

Enable control feature

Over-current, over-temperature, and under-voltage lockout (UVLO) protection

Product Advantages

Excellent line and load regulation for stable output voltage

Low quiescent current for efficient power consumption

Robust protection features to ensure safe and reliable operation

Small package size for compact design

Key Reasons to Choose This Product

Reliable and efficient power supply solution

Flexible enabling for power management applications

Comprehensive protection features for long-term reliability

Compact package size for space-constrained designs

Quality and Safety Features

Compliant with relevant industry standards for quality and safety

Rigorously tested to ensure consistent performance and reliability

Compatibility

The TPS7A2045PDQNR is compatible with a wide range of electronic devices and systems that require a stable 4.5V power supply, such as industrial equipment, consumer electronics, and automotive applications.

Application Areas

Industrial control and automation

Consumer electronics

Automotive electronics

Portable devices

General power supply applications

Product Lifecycle

The TPS7A2045PDQNR is an active product and is currently available for purchase. There are no known equivalent or alternative models available at this time. If you have any further questions or need additional information, please contact our sales team through our website.

Frequently Asked Questions(FAQ)

How does the TPS7A2045PDQNR compare to other low-dropout regulators in terms of quiescent current and dropout voltage when delivering 300 mA, and what are the implications for battery-powered applications?
The TPS7A2045PDQNR exhibits a quiescent current (Iq) of just 15 µA, which is significantly lower than many conventional LDOs that often exceed 50 µA under similar load conditions. This ultra-low Iq directly extends battery life in portable devices by minimizing static power draw. Additionally, it maintains a maximum dropout voltage of only 0.14 V at 300 mA, enabling efficient operation even as input voltages approach the output level. These characteristics make it particularly suitable for always-on or intermittently active systems where both efficiency and minimal leakage matter.
What thermal considerations should be evaluated when using the TPS7A2045PDQNR in a compact PCB layout with limited copper area, especially if the input-to-output differential is near its maximum rated value?
With a maximum dropout of 0.14 V at 300 mA, the worst-case power dissipation occurs when Vin = 4.64 V and Vout = 4.5 V, resulting in Pd = (4.64 - 4.5) × 0.3 A ≈ 0.042 W. While this appears small, continuous operation under such conditions without an exposed pad soldered to adequate copper can lead to junction temperature rise. Given the device’s thermal resistance from junction to ambient (θJA) is typically around 85°C/W in standard layouts, even this small dissipation could elevate TJ by over 3.5°C per degree Celsius above ambient—especially problematic in sealed enclosures or high-temperature environments up to 85°C ambient. Proper thermal relief via the exposed pad and ground plane connection is essential.
Can the TPS7A2045PDQNR operate reliably in automotive-grade temperature ranges, and how does its protection circuitry support system robustness in harsh environments?
Yes, the TPS7A2045PDQNR supports operation from -40°C to +125°C (TJ), making it compatible with automotive and industrial temperature classes. Its integrated protections include overcurrent, overtemperature shutdown, and under-voltage lockout (UVLO), all critical for preventing damage during transients such as load dumps or cold cranking. The UVLO ensures the regulator doesn’t engage until the input reaches a sufficient threshold, avoiding erratic behavior at low voltages. Together, these features enhance reliability in applications like infotainment systems or remote sensors exposed to extreme temperatures and electrical noise.
How does the PSRR performance of the TPS7A2045PDQNR degrade at higher frequencies, and what design steps are recommended to maintain clean output in switching power supply proximity?
The TPS7A2045PDQNR provides 65 dB PSRR at 100 Hz but drops to approximately 40 dB at 1 MHz. This decline reflects typical behavior for LDOs due to internal compensation roll-off. In systems powered by buck converters running near or above 500 kHz, this reduced rejection may allow ripple coupling into sensitive analog loads. To mitigate this, designers should ensure adequate decoupling between input and output using low-ESR ceramics (e.g., 10 µF X7R at output, 1 µF at input), minimize trace inductance, and consider adding a second-stage filter if necessary. Layout symmetry and grounding practices also play a role in preserving PSRR performance.
What is the significance of the 4-X2SON package dimensions and exposed pad configuration for thermal management and PCB footprint constraints in space-constrained designs?
The TPS7A2045PDQNR uses a 4-X2SON (1x1 mm) package with an exposed thermal pad, enabling direct heat sinking to the PCB. This allows efficient conduction of waste heat away from the die compared to non-exposed pads. However, the tiny footprint demands precise soldering and stencil design—misalignment can cause poor thermal contact or shorting. For high-current or high-differential scenarios, the exposed pad must be connected to a solid ground plane with multiple vias. In contrast, larger packages like SOT-23 may offer easier handling but worse thermal performance per unit area.
How does the enable pin logic affect startup sequencing in multi-rail systems using the TPS7A2045PDQNR, and what precautions prevent latch-up or reverse current during brown-out events?
The TPS7A2045PDQNR features a standard active-high enable pin. When pulled low, the device enters shutdown with IQ reduced to sub-µA levels. During brown-out conditions, if the EN pin floats, internal hysteresis prevents unintended turn-on; however, floating pins risk partial conduction. Therefore, EN should be tied to a known state through a resistor (e.g., 100 kΩ pull-down) or actively controlled by a supervisor IC. Additionally, reverse current flow from output to input is blocked by parasitic diodes, but care must still be taken if downstream loads are capacitive and large.
Compared to adjustable LDOs like the TPS7A2045PDQNRA1, what trade-offs exist in using the fixed-output version regarding bill of materials cost versus flexibility in voltage selection?
The TPS7A2045PDQNR offers fixed 4.5V output, eliminating the need for external resistors used in adjustable versions to set the feedback voltage. This reduces component count and simplifies layout, lowering BOM cost and potential failure points. However, it lacks flexibility if the target voltage drifts slightly due to manufacturing variation or aging. In most applications requiring exactly 4.5V (±2%), the fixed option is preferred. Adjustable variants become advantageous only when tuning is needed post-deployment or across product families with minor voltage adjustments.
What impact do output capacitance requirements have on stability when designing with the TPS7A2045PDQNR, and why might ceramic capacitors be preferred despite their limitations in some LDO topologies?
The TPS7A2045PDQNR is designed for stable operation with ceramic output capacitors down to 1 µF, thanks to its internal compensation architecture. Using higher values (e.g., 10–22 µF) improves transient response and PSRR but must avoid excessive ESR, which could destabilize some LDOs. Ceramics are favored for their low ESL/ESR and small size, but bulk capacitance is often combined with them to handle surge currents. Avoid aluminum electrolytics unless absolutely required, as their high ESR can lead to ringing or instability in tightly compensated designs like this one.
How does moisture sensitivity level (MSL) rating influence handling procedures during reflow soldering, and what precautions apply to the TPS7A2045PDQNR in high-humidity assembly environments?
Classified as MSL 1, the TPS7A2045PDQNR has unlimited floor life before reflow, meaning it can be exposed to ambient conditions indefinitely without baking. This simplifies inventory management in humid climates. Nevertheless, best practice dictates storing unpackaged parts in dry cabinets and monitoring desiccant status in humidity-controlled trays. Reflow profiles must still adhere to JEDEC J-STD-020 guidelines, including peak temperatures below 260°C and total time above liquidus kept within specification to preserve bond integrity and metallization layers.
What role does the under-voltage lockout (UVLO) feature play in system-level fault tolerance, and how does its threshold interact with input voltage ramp rates during power-up?
UVLO prevents the TPS7A2045PDQNR from turning on until the input exceeds approximately 3.3V, ensuring the output remains stable and not saturated during undervoltage transients. If Vin ramps slowly (e.g., <10 ms), the device will delay turn-on until the threshold is crossed. Fast ramp rates may cause premature activation if the threshold isn't properly met. Designers should verify that power sequencing doesn’t violate this window—especially when sharing rails with other regulators or microcontrollers that may require coordinated start-up.
In what scenarios would the 6V absolute maximum input voltage rating of the TPS7A2045PDQNR become relevant, and how should transient spikes be mitigated beyond basic clamping circuits?
The 6V max rating implies caution when feeding the regulator from sources like unregulated wall adapters or battery strings where voltage overshoots can occur. While TVS diodes are common for spike protection, they respond too slowly for fast transients (<1 ns). Instead, series resistors combined with fast-clamp diodes (e.g., PESD5V0S1BA) placed close to the IC help limit dv/dt. Alternatively, pre-regulating the input with a simple Zener shunt or buck converter reduces stress on the LDO and improves overall efficiency.
How does the choice of output capacitor dielectric material affect long-term reliability in high-temperature applications involving the TPS7A2045PDQNR?
For the TPS7A2045PDQNR, X7R and X8R dielectrics are recommended due to their stable capacitance over temperature (-55°C to +125°C) and voltage. Y5V capacitors exhibit significant capacitance loss at elevated temperatures and DC bias, potentially leading to insufficient filtering or instability. C0G/NP0 types offer superior stability but lower capacitance density. Over time, ceramic capacitors may suffer from piezoelectric cracking under mechanical stress, though modern MLCCs have improved. Always derate capacitance by 20–30% in critical applications to account for aging and voltage effects.
What considerations arise when cascading multiple TPS7A2045PDQNR regulators in a system requiring multiple well-regulated rails?
Cascading introduces challenges such as cumulative noise, increased power loss, and complex sequencing. Since each stage dissipates (Vin_stage - Vout_stage) × Iload, efficiency drops rapidly. Moreover, PSRR degrades multiplicatively. Only justified when strict isolation is required (e.g., analog vs digital rails). Better alternatives include single-chip PMICs or buck regulators with built-in sequencing. If cascading is unavoidable, ensure each LDO has adequate decoupling, monitor junction temperatures, and validate startup behavior under worst-case load combinations.
How does the RoHS compliance status of the TPS7A2045PDQNR align with global environmental regulations, and what documentation is typically required for compliance certification?
As RoHS3 compliant, the TPS7A2045PDQNR meets EU Directive 2011/65/EU and subsequent amendments, restricting hazardous substances including lead, mercury, cadmium, and certain phthalates. Texas Instruments provides full material declarations and conflict minerals reporting upon request. Manufacturers seeking certification should obtain a supplier-specific declaration (SSD) and integrate it into their own compliance dossiers for OEMs. Note that RoHS exemptions may still apply to specific components under review.
What are the key differences between the TPS7A2045PDQNR and higher-current LDOs like the TPS7A4700 regarding thermal performance and application suitability?
While both are low-IQ, low-noise LDOs, the TPS7A4700 delivers up to 2A versus the TPS7A2045PDQNR’s 300 mA. This enables the former to support more demanding loads but results in higher dropout voltage (~0.25V) and greater power dissipation at high currents. The TPS7A2045PDQNR trades raw current capability for superior noise and smaller form factor, making it ideal for precision analog front-ends. Conversely, the TPS7A4700 suits powering FPGAs or RF modules where higher current outweighs noise concerns. Thermal design scales nonlinearly with current squared times resistance.
How does the absence of programmable output voltage impact redesign efforts if future hardware revisions require a different rail voltage?
Since the TPS7A2045PDQNR provides a fixed 4.5V output, any change in required voltage necessitates replacing the entire regulator. This increases revision costs and delays compared to adjustable solutions where only resistors change. However, for mature designs where voltage is tightly controlled by IC specifications and unlikely to shift, the fixed output simplifies validation and reduces risk. Engineers should confirm final voltage requirements early and avoid over-engineering with adjustable options unless flexibility is explicitly needed.
What testing methodology best validates real-world performance of the TPS7A2045PDQNR under dynamic load transients, and how do results inform PCB layout decisions?
Perform step-load tests using electronic loads capable of ramping current from 5 mA to 300 mA in under 10 µs, measuring output ripple and recovery time (<50 mV deviation acceptable). Simultaneously capture input current waveform to assess PSRR and stability. Oscilloscope probes should use short ground leads to avoid picking up noise. Poor transient response may indicate insufficient output capacitance, excessive loop gain peaking, or layout-induced inductance. Results guide decisions on capacitor placement, trace routing, and ground plane segmentation around sensitive analog nodes.
How does the ECCN classification of EAR99 affect export controls for the TPS7A2045PDQNR, and what due diligence applies when shipping to international customers?
Classified under EAR99, the TPS7A2045PDQNR is generally exempt from most U.S. export licensing requirements, simplifying distribution to most countries. However, end-use restrictions apply—particularly in military, nuclear, or surveillance contexts. Importers must verify end-user and end-use to comply with local laws. While no license is typically needed, exporters should document compliance efforts, including customer screening and transaction records, in case of audits. Always consult current BIS regulations before shipping high-volume orders.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments TPS7A2045PDQNR

Product Attribute TPS7A2042PDQNR TPS7A2050PDQNR TPS7A2045PDBVR TPS7A2036PDQNR
Part Number TPS7A2042PDQNR TPS7A2050PDQNR TPS7A2045PDBVR TPS7A2036PDQNR
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Control Features - - - -
PSRR - - - -
Voltage - Output (Min/Fixed) - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Series - - - -
Number of Regulators - - - -
Voltage Dropout (Max) - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Current - Output - - - -
Protection Features - - - -
Voltage - Input (Max) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Output (Max) - - - -
Current - Supply (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Output Configuration - - - -
Current - Quiescent (Iq) - - - -

TPS7A2045PDQNR Datasheet PDF

Download TPS7A2045PDQNR pdf datasheets and Texas Instruments documentation for TPS7A2045PDQNR - Texas Instruments.

PCN Design/Specification
TPS7A20 17/Dec/2021.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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TPS7A2045PDQNR Image

TPS7A2045PDQNR

Texas Instruments
32D-TPS7A2045PDQNR

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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