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Home Products Integrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching Regulators~~TPS65400QRGZRQ1~~

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TPS65400QRGZRQ1 - Texas Instruments

Name: Texas Instruments TPS65400QRGZRQ1
Brand: Texas Instruments
SKU: TPS65400QRGZRQ1
Availability: InStock
Rating: 5 (9 reviews)

Manufacturer Part Number: TPS65400QRGZRQ1

Manufacturer: Texas Instruments

Allelco Part Number: 32D-TPS65400QRGZRQ1

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 7,882 pcs available, New & Original

Parts Description: IC REG BUCK ADJ 4A/2A QD 48VQFN

Package: 48-VQFN (7x7)

Data sheet: -

RoHs Status: ROHS3 Compliant

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In stock: 7882

Specifications

TPS65400QRGZRQ1 Tech Specifications
Texas Instruments - TPS65400QRGZRQ1 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - TPS65400QRGZRQ1

Product Attribute	Attribute Value
Manufacturer	Texas Instruments
Voltage - Output (Min/Fixed)	0.6V
Voltage - Output (Max)	16.2V
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	18V
Topology	Buck
Synchronous Rectifier	Yes
Supplier Device Package	48-VQFN (7x7)
Series	Automotive, AEC-Q100
Package / Case	48-VFQFN Exposed Pad

Product Attribute	Attribute Value
Package	Tape & Reel (TR)
Output Type	Adjustable
Output Configuration	Positive
Operating Temperature	-40°C ~ 125°C (TJ)
Number of Outputs	4
Mounting Type	Surface Mount
Function	Step-Down
Frequency - Switching	275kHz ~ 2.2MHz
Current - Output	4A, 2A
Base Product Number	TPS65400

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Parts Introduction

TPS65400QRGZRQ1 (1)

Manufacturer Part Number

TPS65400QRGZRQ1

Manufacturer

Texas Instruments

Introduction

Automotive-Grade Step-Down Voltage Regulator with Four Outputs

Product Features and Performance

Step-Down (Buck) Topology

Four Adjustable Outputs

Synchronous Rectifier for Efficiency

Frequency Switching Range: 275kHz to 2.2MHz

Wide Input Voltage Range: 4.5V to 18V

Adjustable Output Voltage: 0.6V to 16.2V

Output Current Capability: 4A and 2A

Supports PWM, Auto and 100% modes

Product Advantages

High-Efficiency Operation

Reduced External Components

Flexible Power Sequencing

Thermal Shutdown Protection

Multiple Output Voltage Configurations

Adjustable Switching Frequency for EMI Management

Key Technical Parameters

Voltage - Input (Min): 4.5V

Voltage - Input (Max): 18V

Voltage - Output (Min/Fixed): 0.6V

Voltage - Output (Max): 16.2V

Current - Output: 4A, 2A

Operating Temperature: -40°C to 125°C (TJ)

Quality and Safety Features

Automotive Grade (AEC-Q100 Qualified)

Over-Temperature Protection

Over-current Protection

Under-voltage Lockout

Compatibility

Surface Mount

Compatible with 48-VFQFN Exposed Pad Package

Application Areas

Automotive Applications

Power Management for Car Infotainment Systems

Advanced Driver-Assistance Systems (ADAS)

Product Lifecycle

Status: Active

No Current Indication of Discontinuation

Replacements and Upgrades Not Specified

Several Key Reasons to Choose This Product

Optimized for Automotive Applications with AEC-Q100 Qualification

Highly Flexible with Four Adjustable Outputs for Comprehensive Power Solutions

Increased System Efficiency and Performance Due to Synchronous Rectification

Durability and Reliability in Harsh Automotive Environments

Optimizable Frequency Switching for Reduced EMI

Easy to Integrate with Standard Surface Mount Technology

Frequently Asked Questions(FAQ)

What are the key performance trade-offs when selecting the TPS65400QRGZRQ1 for a high-efficiency automotive power rail design requiring four independent adjustable outputs?: The TPS65400QRGZRQ1 integrates four buck converters (two 4A and two 2A) with a wide input range of 4.5V to 18V, making it suitable for automotive systems such as ADAS or infotainment where multiple voltage rails are needed. However, operating at higher switching frequencies (up to 2.2MHz) improves transient response and reduces inductor size but increases switching losses, which can reduce overall efficiency—particularly in light-load conditions. Designers must balance component footprint against thermal constraints, especially since all four channels share a common package and thermal pad. In applications like camera modules or sensor hubs, this allows compact layout integration, but derating output current by 10–15% is advisable under sustained high ambient temperatures due to limited exposed pad dissipation.

How does the TPS65400QRGZRQ1 compare to discrete buck converter solutions in terms of BOM cost, board space, and reliability in automotive environments?: Compared to implementing four separate discrete buck regulators, the TPS65400QRGZRQ1 reduces bill-of-materials complexity by integrating control logic, gate drivers, and synchronous rectification into a single 48-pin VQFN package. While the unit price may be higher than individual ICs, savings come from reduced passive components, simplified PCB routing, and lower assembly labor. More importantly, qualification to AEC-Q100 Grade 1 ensures robustness against thermal cycling, humidity, and mechanical stress typical in automotive deployments. Discrete solutions often require additional protection circuitry and margining, increasing failure risk over time. For systems requiring ISO 26262 compliance, the integrated architecture also simplifies functional safety documentation compared to multi-IC designs.

Can the TPS65400QRGZRQ1 support dynamic voltage scaling across its four outputs while maintaining stability and meeting timing requirements?: Yes, each output channel of the TPS65400QRGZRQ1 supports independent adjustable output voltages from 0.6V to 16.2V via external resistor dividers, enabling per-rail dynamic voltage scaling. However, simultaneous fast transitions on multiple channels may induce cross-talk through shared ground planes or supply paths, potentially causing instability. TI recommends using spread-spectrum switching modes and ensuring adequate decoupling capacitance per channel. When used in motor control or ECUs with variable loads, staggered ramp rates or soft-start synchronization should be considered. The 275kHz to 2.2MHz programmable frequency range allows optimization for noise sensitivity versus efficiency, but rapid frequency hopping can complicate EMI certification if not managed carefully.

What considerations apply when using the TPS65400QRGZRQ1 in cold-start scenarios below -40°C or during rapid temperature transients in harsh automotive environments?: Although the device is specified down to -40°C junction temperature, actual performance near this limit depends heavily on PCB layout and thermal coupling. During cold starts, semiconductor leakage currents increase slightly, which can affect startup sequencing if soft-start is not properly configured. Additionally, ceramic capacitors lose effective capacitance at low temperatures, potentially violating minimum input/output capacitance requirements. It's critical to select X7R or X8R dielectric capacitors rated for automotive temperature ranges. The MSL 3 classification indicates the part can withstand up to 168 hours above 260°C before baking, but repeated exposure to extreme cold without thermal management may accelerate solder joint fatigue.

How does the internal current limit and thermal shutdown feature of the TPS65400QRGZRQ1 impact fault tolerance in unregulated input applications?: Each high-side MOSFET in the TPS65400QRGZRQ1 includes cycle-by-cycle current limiting, typically around 5.2A for the 4A channels and 2.6A for the 2A channels, providing protection against short circuits or overloads. This enables robust operation even with marginally regulated inputs, such as those from aging alternators. However, continuous operation near the limit triggers thermal foldback, reducing efficiency and increasing heat generation. In systems like battery-powered diagnostics modules, this self-protective behavior prevents catastrophic failure but may cause unexpected brownouts if not accounted for in system-level power budgets. Designers should simulate worst-case fault conditions using SPICE models to verify that output ripple remains within tolerance during overcurrent events.

Is it feasible to operate all four outputs of the TPS65400QRGZRQ1 simultaneously at full load without exceeding junction temperature in a sealed automotive enclosure?: Running all four channels continuously at maximum current (e.g., 4A + 4A + 2A + 2A = 12A total) generates significant heat. Assuming 90% efficiency per channel, power loss would approximate 1.2A × 12V ≈ 14.4W, plus conduction losses through the PCB. With a thermal resistance of ~20°C/W from junction to ambient in still air, this could raise TJ beyond 125°C unless forced airflow or thick copper planes are used. Most automotive designs derate by 20–30% for longevity. For example, limiting combined output to 8A total allows safe operation at 85°C ambient. Using multiple vias under the exposed pad helps transfer heat to inner layers, but enclosure sealing limits natural convection, making active cooling impractical in many cases.

What are the implications of choosing different switching frequencies within the 275kHz–2.2MHz range on EMI performance and inductor selection for the TPS65400QRGZRQ1?: Higher switching frequencies allow smaller inductors and faster response times, beneficial in space-constrained designs like head units or radar sensors. However, they shift conducted emissions into CISPR 25 Class 5 bands more densely, complicating compliance without proper filtering. Lower frequencies reduce peak EMI but require larger magnetics, increasing cost and footprint. The TPS65400QRGZRQ1 supports frequency dithering to spread spectral energy, aiding EMI mitigation. Inductor saturation current must exceed peak load plus 30%, and core material choice (e.g., ferrite vs. powder metal) affects both efficiency and audible noise. In audio-sensitive zones, frequencies above 1.5MHz are often avoided unless shielded inductors are employed.

How does the TPS65400QRGZRQ1 support sequencing and tracking functions critical for microcontrollers and FPGAs in automotive SoCs?: The device supports configurable soft-start timing per channel and can be synchronized to an external clock, enabling precise power-up sequencing essential for avoiding inrush surges during ECU initialization. While it lacks dedicated tracking pins, designers can implement voltage ramping using precision resistors and feedback networks to mimic tracking behavior. For processors requiring strict power-good signals, open-drain enable pins allow external monitoring. However, unlike dedicated PMICs with advanced sequencing logic, complex multi-voltage rails may still require external controllers or firmware intervention to coordinate reset lines and boot sequences reliably.

Are there any limitations when paralleling outputs of the TPS65400QRGZRQ1 for higher current applications?: No, the TPS65400QRGZRQ1 does not support paralleling outputs internally. Attempting to combine channels risks uneven current sharing due to slight variations in threshold voltages and duty cycles, leading to thermal imbalance and potential failure. Instead, designers should use the two dedicated 4A channels for high-current rails and avoid mixing them with 2A channels unless load demands permit. If additional current is needed, external multiphase designs or separate regulators are recommended. The datasheet explicitly warns against inter-channel loading, emphasizing that each regulator operates independently with individual compensation networks.

What role does the integrated LDO play in the TPS65400QRGZRQ1, and how does it affect noise performance in analog subsystems?: The TPS65400QRGZRQ1 includes a low-noise linear regulator intended for quiet supplies such as ADC or reference buffers. Its output is typically derived from one of the switched rails, so noise levels depend on switching characteristics of that particular buck stage. At light loads, the LDO maintains low dropout and ripple rejection (>60dB), but during heavy switching activity, conducted noise can couple through shared power delivery networks. To minimize interference, bypass capacitors should be placed close to sensitive loads, and the LDO output should not drive high-speed digital circuits. In vision processing units, this feature enables clean power for image sensors without adding extra LDOs.

How does the TPS65400QRGZRQ1 handle reverse polarity protection and what alternatives exist if external protection is required?: The device itself does not include reverse polarity protection; however, it features undervoltage lockout and overvoltage protection on the input side. External diodes or MOSFET-based clamps are necessary for true reverse polarity immunity. Automotive-grade TVS diodes should be selected based on ISO 7637-2 pulse testing requirements, particularly for load dump scenarios up to 40V. Some designs incorporate a P-channel FET ahead of the input capacitor to block reverse current, though this adds conduction loss. Since the input range is 4.5–18V, compatibility with 12V/24V systems is maintained, but transient suppression remains critical.

What are the best practices for layout and grounding when using the TPS65400QRGZRQ1 in a 4-layer automotive PCB?: Place input and output capacitors as close as possible to the respective pins, with minimal loop area to reduce ESL and ringing. Use a solid ground plane on Layer 2, connecting the exposed pad directly to this plane via multiple thermal vias. Separate analog and power grounds only if absolutely necessary, and reconnect at a single point near the IC. Keep feedback traces away from switching nodes to prevent coupling. For EMI reduction, route switching loops inward and shield noisy components. TI’s reference design demonstrates optimal placement for 48-VQFN packages, showing that even in dense automotive stacks, careful layer stackup minimizes crosstalk between the four buck stages.

Can the TPS65400QRGZRQ1 be used in non-automotive industrial applications, and what modifications might be needed?: Technically, yes—the same electrical specifications apply outside automotive use. However, AEC-Q100 qualification ensures reliability beyond standard industrial grades, which may be unnecessary and costly for non-regulated environments. Operating temperature range (-40°C to 125°C) is wider than typical industrial (-40°C to 85°C), so derating may not be required. But RoHS compliance and REACH status remain relevant globally. Unless facing extended thermal stress or vibration, simpler PMICs like the TPS65267 may offer better value. That said, the integrated functionality still justifies consideration in compact industrial gateways or robotics where board space is premium.

How does the TPS65400QRGZRQ1 support fault reporting and diagnostic capabilities in safety-critical automotive systems?: The IC provides open-drain power-good signals per channel, overcurrent flags, and thermal warnings through dedicated pins. These can be monitored by a microcontroller to trigger resets or enter safe states. However, it lacks built-in fault memory or I²C communication, limiting detailed diagnostics. For ASIL-B or higher compliance, external watchdog circuits may be needed. The absence of serial interfaces means configuration changes require external resistors, increasing susceptibility to tampering or drift over time. In contrast, newer PMICs offer telemetry, but the TPS65400 remains a robust yet basic solution for functional safety without advanced observability.

What impact does input voltage ripple have on the stability of the TPS65400QRGZRQ1, especially when powered from a DC-DC converter upstream?: Excessive input ripple—especially at subharmonic frequencies near the switching edges—can destabilize feedback loops if not filtered adequately. The device requires clean input rails; typical recommendations include 10µF ceramic plus 47µF polymer capacitors to suppress transients. Ripple above 200mVpp may force the controller to adjust frequency or duty cycle unpredictably, affecting output regulation. In systems fed by a pre-regulator, ensure the TPS65400’s minimum input voltage (4.5V) is not violated during load steps. Poor input impedance matching can also cause oscillations, particularly when using long cables or connectors in mobile platforms.

How should the enable pins be utilized to implement efficient sleep modes in battery-operated automotive edge devices using the TPS65400QRGZRQ1?: Each channel has independent enable control, allowing partial wake-up or shutdown of unused rails. For example, disabling the 5V rail while keeping 3.3V active conserves power in standby mode. Enable signals should be driven by GPIOs with pull-down resistors to prevent floating states. Avoid enabling channels too quickly after power-up; instead, stagger enable timings to reduce inrush current. In ultra-low-power applications like TPMS modules, combining deep sleep with dynamic frequency scaling maximizes battery life while maintaining readiness. Note that disabled channels draw negligible quiescent current (<1µA per channel), contributing significantly to system-level efficiency.

What precautions are necessary when replacing the TPS65400QRGZRQ1 with a functionally equivalent part in an existing design?: Substitution must account for pin compatibility, package dimensions, and thermal profiles. The 48-VQFN (7x7) footprint is standardized, but solder paste stencil thickness and reflow profiles affect joint integrity. Ensure alternate parts support the same switching frequency range, output configurations, and protection features. Verify that compensation networks match bandwidth requirements—some competitors use fixed compensation, which may necessitate redesign. Also confirm availability of automotive grade and AEC-Q100 certification if original design relied on it. Always perform HALT/HASS testing post-replacement to validate reliability claims.

Does the TPS65400QRGZRQ1 require external Schottky diodes for synchronous rectification, and how does this affect efficiency?: No external diodes are needed—the device uses internal MOSFETs for synchronous rectification, eliminating diode conduction losses and improving efficiency, especially at moderate to high loads. Typical efficiency exceeds 90% at full load with 12V input and 3.3V output. However, body diode reverse recovery effects can still occur during dead time, particularly at light loads or high switching frequencies. Proper gate driving and layout minimize these losses. Compared to asynchronous designs, the TPS65400QRGZRQ1 delivers superior thermal performance and lower output ripple, crucial for analog subsystems in automotive electronics.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments TPS65400QRGZRQ1

Product Attribute
Part Number	TPS65400QRGZRQ1	TPS65400RGZT	TPS65400RGZR	TPS65400QRGZTQ1
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Topology	Buck	Buck	Buck	Buck
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad
Frequency - Switching	275kHz ~ 2.2MHz	275kHz ~ 2.2MHz	275kHz ~ 2.2MHz	275kHz ~ 2.2MHz
Output Configuration	Positive	Positive	Positive	Positive
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Function	Step-Down	Step-Down	Step-Down	Step-Down
Voltage - Output (Min/Fixed)	0.6V	0.6V	0.6V	0.6V
Package	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Base Product Number	TPS65400	TPS65400	TPS65400	TPS65400
Voltage - Input (Min)	4.5V	4.5V	4.5V	4.5V
Synchronous Rectifier	Yes	Yes	Yes	Yes
Voltage - Input (Max)	18V	18V	18V	18V
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Output (Max)	16.2V	16.2V	16.2V	16.2V
Supplier Device Package	48-VQFN (7x7)	48-VQFN (7x7)	48-VQFN (7x7)	48-VQFN (7x7)
Number of Outputs	4	4	4	4
Series	Automotive, AEC-Q100	-	-	Automotive, AEC-Q100
Current - Output	4A, 2A	4A, 2A	4A, 2A	4A, 2A

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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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