TPS65251-3RHAR Tech Specifications
Texas Instruments - TPS65251-3RHAR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - TPS65251-3RHAR

Product Attribute	Attribute Value
Part Number	TPS65251-3RHAR
Package	VFQFN-40
Description	VFQFN-40
Stock Condition	Get 10820 pcs available quantity at Allelco
Payment	PayPal / TT / Credit Card / Western Union
Allelco Certifications	ESD / ISO 9001 / ISO 13485 / ISO 28000

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
RoHs Status	-
Warranty	100% Perfect Functions
Transport port	Hong Kong
Shipping by	DHL / FedEx / UPS / TNT / SF Express
RFQ Email	info@allelco.com

Parts Introduction

TPS65251-3RHAR (1)

Manufacturer Part Number

TPS65251-3RHAR

Manufacturer

Texas Instruments

Introduction

The TPS65251-3RHAR is a highly integrated, three-channel, synchronous step-down DC/DC converter from Texas Instruments. It provides a high-efficiency, adjustable power solution with a wide input voltage range, suitable for a variety of power-sensitive applications.

Product Features and Performance

Three independent, adjustable step-down converters

Wide input voltage range: 4.5V to 18V

Adjustable output voltage from 0.8V to 17V

Output current up to 3A, 2A per channel

Switching frequency range of 300kHz to 2.2MHz

Synchronous rectification for high efficiency

Thermal shutdown and overcurrent protection

Product Advantages

High efficiency and power density

Flexible output voltage configuration

Compact 40-pin VFQFN package

Excellent thermal performance

Key Reasons to Choose This Product

Comprehensive power management solution in a single chip

Wide input voltage range accommodates diverse applications

Adjustable output voltage and current allows for customization

Robust protection features ensure reliable operation

Quality and Safety Features

Thermal shutdown and overcurrent protection

Meets industrial temperature range requirements (-40°C to 125°C)

RoHS-compliant and lead-free package

Compatibility

The TPS65251-3RHAR is compatible with a wide range of electronic devices and systems that require multiple, adjustable power rails.

Application Areas

Portable electronics

Industrial automation and control systems

Telecommunications equipment

Automotive electronics

Product Lifecycle

The TPS65251-3RHAR is an active and currently available product. There are no known plans for discontinuation at this time. offers a range of similar and alternative products, including the TPS65250, TPS65251-1, and TPS65251-2, which may be worth considering based on your specific power requirements and design needs. For more information or assistance in selecting the most suitable product, please contact our website's sales team.

Frequently Asked Questions(FAQ)

How does the TPS65251-3RHAR handle thermal performance when delivering 3A and 2A simultaneously across its three adjustable outputs under continuous load in a compact 40-VQFN package?: The TPS65251-3RHAR integrates three independent synchronous buck converters capable of delivering up to 3A, 2A, and 2A respectively, all within a single 40-VQFN (6x6 mm) package with an exposed thermal pad. When operating at full output currents, particularly in high ambient temperatures or poor PCB thermal vias, localized heating can occur due to combined conduction and switching losses. The device supports thermal shutdown protection above 150°C junction temperature, but sustained full-load operation requires careful layout with adequate copper area on the bottom layer connected via multiple thermal vias to the exposed pad. Without proper heat dissipation, derating may be necessary to maintain reliability and prevent premature thermal throttling.

What are the key differences between using the TPS65251-3RHAR in fixed versus adjustable voltage mode for system power sequencing and noise sensitivity?: While the TPS65251-3RHAR supports fully adjustable output voltages from 0.8V to 17V, choosing fixed internal references versus external resistor-divider configurations impacts both power sequencing accuracy and output noise. Fixed internal rails offer tighter tolerance (±1%) and better transient response due to optimized compensation networks, whereas adjustable modes allow flexibility but introduce additional noise through feedback resistors, especially at higher switching frequencies like 2.2MHz. In noise-sensitive analog subsystems, fixed-mode outputs often provide lower output ripple, though this is mitigated by the device’s integrated filtering and low ESR capacitor compatibility. Designers must weigh the need for custom voltages against stability and EMI performance during system-level validation.

Can the TPS65251-3RHAR be used to power FPGA core and I/O rails requiring different supply margins without additional post-regulation stages?: Yes, the TPS65251-3RHAR can directly drive FPGA core rails (e.g., 1.0V–1.2V) and I/O banks (e.g., 1.8V, 2.5V, or 3.3V) using its three independent adjustable outputs, eliminating the need for discrete LDOs in many cases. Each converter operates asynchronously and independently, allowing staggered turn-on via soft-start control to manage inrush current and reduce peak input demand. However, tight regulation (<±2% deviation under load steps) may require careful selection of output capacitors with low ESL and ESR, and layout symmetry to minimize ground bounce. The absence of cross-channel coupling ensures minimal interference between rails, supporting robust FPGA initialization even at maximum switching frequency (2.2MHz).

How does switching frequency selection affect board space and efficiency trade-offs when using the TPS65251-3RHAR in battery-powered industrial equipment?: Operating the TPS65251-3RHAR between 300kHz and 2.2MHz allows designers to balance component size against efficiency. Higher frequencies (e.g., 2.2MHz) enable use of smaller inductors and ceramic capacitors, reducing PCB footprint—critical in space-constrained industrial devices—but increase switching losses, lowering peak efficiency by approximately 5–10% compared to lower frequencies (e.g., 600kHz). At 2.2MHz, core loss dominates, while at 300kHz, passive component volume increases. For battery applications, maximizing efficiency at partial loads favors moderate frequencies (~1MHz), where converter quiescent current remains low (<1µA in shutdown) and light-load efficiency stays above 85%. Thus, frequency programming must align with typical load profiles rather than absolute peak performance.

What considerations apply when cascading the TPS65251-3RHAR with other PMICs or power stages in a multi-voltage automotive infotainment system?: In automotive environments, the TPS65251-3RHAR’s wide input range (4.5V–18V) makes it suitable for 12V/24V systems, but coexistence with other regulators requires attention to start-up sequencing, load sharing, and fault isolation. The device provides open-drain power-good signals per channel, enabling coordinated enablement of downstream components such as audio codecs or microcontrollers. However, simultaneous switching noise from multiple high-current converters can couple into sensitive analog paths unless proper decoupling, partitioning, and grounding strategies are implemented. Additionally, automotive-grade layout practices—such as star-point grounds and minimized loop areas—are essential to meet EMI standards and ensure reliable operation across -40°C to +125°C junction limits.

Is it feasible to operate the TPS65251-3RHAR at full 3A output with only ceramic input capacitors meeting CISPR 25 Class 5 requirements?: The TPS65251-3RHAR supports ceramic input capacitors down to 10µF per rail, provided they have low ESL and stable capacitance over temperature. However, delivering sustained 3A from a single buck converter demands sufficient bulk capacitance to buffer input transients during load steps. Using only ceramic caps may result in excessive input voltage droop (>100mV), risking instability or false under-voltage lockout if the input source impedance is high (e.g., long traces or unregulated batteries). Adding a small tantalum or polymer capacitor in parallel improves transient resilience without compromising EMI performance. Compliance with CISPR 25 Class 5 further necessitates careful placement and shielding to suppress conducted emissions, which the 2.2MHz switching edge helps mitigate due to shorter wavelength.

How does the internal compensation network behave when one output of the TPS65251-3RHAR is disabled while others remain active?: Disabling any one or two outputs of the TPS65251-3RHAR reduces overall load current but does not significantly alter the internal compensation of active channels, as each converter maintains independent feedback loops. However, disabling an output tied to a high-side switch may leave its inductor floating, potentially inducing ringing or back-EMF if not properly handled with a freewheeling diode or clamping circuit. More importantly, the total quiescent current drops, improving standby efficiency—a critical factor in always-on systems. Since compensation is preset for mid-band crossover frequencies around 10–50kHz, stability margins remain robust across partial-load conditions, though output ripple increases slightly due to reduced damping from lower output capacitance.

What layout constraints must be observed when routing high-current paths associated with the TPS65251-3RHAR’s 3A buck converter in a 6-layer PCB stackup?: Routing the 3A path for the TPS65251-3RHAR demands strict attention to current density and thermal management. The high-side MOSFET conduction path—from VIN to SW node—carries pulsed currents exceeding 10A during on-times, requiring wide traces (≥12 mil) and short, direct connections. Simultaneously, the SW node return path to the GND plane must minimize loop area to reduce EMI and radiated emissions. On a 6-layer board, placing the power stage on inner layers with adjacent solid ground planes enhances shielding, while the exposed pad must connect to an internal or bottom-layer copper pour using ≥8 thermal vias (via diameter ≥0.3mm) to dissipate heat effectively. Poor routing can cause voltage droop, increased switching losses, or thermal runaway under sustained loads.

How does the TPS65251-3RHAR support system-level diagnostics in safety-critical applications requiring real-time monitoring of output integrity?: The TPS65251-3RHAR includes per-channel power-good (PGOOD) pins that assert low when the corresponding output falls outside ±10% of its setpoint, enabling microcontroller-based health checks. These signals can trigger fault logging, graceful shutdown, or redundancy activation in safety-certified designs. Additionally, the EN pins support precise sequencing via external resistors or logic levels, ensuring no output ramps before inputs stabilize. However, diagnostic coverage depends on accurate threshold calibration—especially at low voltages (e.g., 0.8V), where comparator hysteresis and reference drift become significant. For functional safety (e.g., ISO 26262), external window comparators may supplement internal PGOOD to achieve ASIL compliance, as the IC itself lacks built-in self-test capabilities.

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
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.

Write a Review

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

Use your express account for shipment if you have one.
Use our account for the shipment. Refer to the table below for the approximate charges.

(Different time frame / countries / package size has different price.)

Delivery Method

Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	Japan	4
Middle East	Israel	6

DHL & FedEx Shipment Charges Reference
Shipment charges(KG)	Reference DHL(USD$)
0.00kg-1.00kg	USD$30.00 - USD$60.00
1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

Note:: The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.

QC (Quality Warranty)
Payment Support
Packaging
Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.

Strict quality inspection builds a solid foundation for electronic component quality.

Visual inspection
Performance testing and reliability verification
Standardized full-process testing
Precise control of every parameter

We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.

Quality Inspection

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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.

ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification

ISO 9001: 2015
ISO 13485: 2016
ISO 14001: 2015
ISO 28000: 2007
ISO 45001: 2018
GB/T 27922-2011

SMTA
IPC
ESD
PSMA

TPS65251-3RHAR

Texas Instruments
41D-TPS65251-3RHAR

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TPS65251-3RHAR - Texas Instruments

Specifications

Parts Introduction

Manufacturer Part Number

Manufacturer

Introduction

Product Features and Performance

Product Advantages

Key Reasons to Choose This Product

Quality and Safety Features

Compatibility

Application Areas

Product Lifecycle

Frequently Asked Questions(FAQ)

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

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.

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。

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

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

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

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.

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.

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.

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.

Write a Review

Shipment

Delivery Time

Delivery Cost

Delivery Method

QC (Quality Warranty)

Payment Support

Packaging

Electrostatic Discharge Protection and Handling

Certifications & Memberships

TPS65251-3RHAR

Shopping cart (0 Items)

Compare List (0 Items)

Feedback

Please refer to the English Version as our Official Version.