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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments TPS53311RGTT

Name: TPS53311RGTT
Brand: Texas Instruments
SKU: TPS53311RGTT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TPS53311RGTT

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-VFQFN Exposed Pad

Datasheet:: TPS53311RGTT.pdf

Description:: IC REG BUCK ADJ 3A 16VQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TPS53311RGTT from Texas Instruments is a 3-A synchronous step-down DC/DC regulator with integrated high- and low-side N-channel MOSFETs, operating from 2.9 V to 6 V input and delivering adjustable output from 0.6 V to 0.84 × VIN. It features 1.1-MHz fixed-frequency voltage-mode control, 95.5% peak efficiency, all-ceramic capacitor support, and internal boot strap switch-designed for compact 5-V and 3.3-V point-of-load conversion in space-constrained industrial and embedded systems.

For engineers reviewing the TPS53311RGTT datasheet, TPS53311RGTT pinout, TPS53311RGTT application, or TPS53311RGTT equivalent, key selection considerations include its 16-pin VQFN (3 mm × 3 mm) package, dual-phase interleaving capability via SYNC/PS pins, soft-stop output discharge, prebias start-up support, and comprehensive protection suite including overcurrent, overvoltage, undervoltage, and thermal shutdown.

Technical Context

The TPS53311RGTT implements voltage-mode PWM control with a 1.1-MHz nominal switching frequency in forced CCM mode, supporting five configurable operation modes (FCCM master/slave, DE, HEF) selected via the PS pin. Its internal error amplifier uses a precision 0.6-V reference with ±1.25% tolerance over –40°C to 85°C and supports Type III compensation on the COMP pin.

It integrates dual SW nodes (pins 5/6/7), dual VIN inputs (pins 13/14), dual PGND terminals (pins 15/16), and dedicated bootstrap (VBST), power-good (PGD), and synchronization (SYNC) circuitry-enabling robust 3-A output delivery with <100-ns minimum off-time, 84–89% maximum duty cycle, and 14-MHz unity-gain bandwidth for fast transient response.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.9 V to 6 V - supports wide-input industrial rails including 5-V and 3.3-V supplies without external LDO pre-regulation.
Output Current	Continuous 3 A - delivers full rated load with ≤42.8°C/W junction-to-ambient thermal resistance in 3 mm × 3 mm VQFN package.
Switching Frequency	0.99–1.21 MHz (typ. 1.1 MHz) - enables use of small 1-µH inductors and reduces EMI filtering requirements.
Efficiency	95.5% peak - achieved via low R_DS(on) (24 mΩ @ 3.3 V, 19 mΩ @ 5 V) and SmoothPWM™ auto-skip Eco-mode™ for light-load optimization.
Output Voltage Range	0.6 V to 0.84 × VIN - allows precise regulation down to sub-1-V core voltages while maintaining stability across input variation.
Protection Features	OCP (4.5 A high-side, 5.1 A low-side latched), OVP/UVP (±17% FB threshold), thermal shutdown (140°C latch-off, 40°C hysteresis) - ensures robust fault recovery in unattended systems.
Operating Temperature	–40°C to +85°C ambient - qualified for industrial temperature grade operation without derating.

Pinout & Package

TPS53311RGTT is housed in a thermally enhanced 3 mm × 3 mm, 16-pin VQFN (RGT) package with exposed thermal pad (PGND-connected). The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant and Pb-free.

Pin/Terminal	Circuit Role	Design Meaning
1 EN	Enable input	Active-high logic control with 1.35-MΩ internal pullup; asserts UVLO when pulled low to disable converter and activate soft-stop discharge.
2 SYNC	Synchronization I/O	Bidirectional interface for master-slave interleaving or external clock injection (±20% of 1.1 MHz); falling edge triggers PWM rising edge.
3 PGD	Open-drain power-good output	Indicates valid regulation when FB is within 83–117% of 0.6 V reference; requires external pullup resistor for system sequencing.
4 VBST	Bootstrap supply	Connects external bootstrap capacitor to SW node; enables high-side gate drive with >2.4 V V_VBST–V_SW margin in DCM.
5,6,7 SW	Power switch node	Three parallel connections to internal high-/low-side FETs and external inductor; minimizes trace inductance and improves current sharing.
8 PS	Mode configuration input	Resistor-programmable pin selecting FCCM/DE/HEF mode and master/slave role (e.g., 174 kΩ → DE Master).
9 COMP	Error amplifier compensation	Supports Type III network for stable loop response across load and line variations; sets phase margin and bandwidth.
10 FB	Voltage feedback input	Monitors resistive divider output to regulate V_OUT; also serves as OVP/UVP/PGD detection point with ±17% thresholds.
11 AGND	Analog ground reference	Separate ground return for sensitive analog circuits (error amp, reference, UVLO) to minimize noise coupling from power paths.
12 VDD	Analog bias supply	2.9–3.5 V supply for internal analog functions; includes dedicated UVLO (2.8 V threshold, 75-mV hysteresis).
13,14 VIN	Power conversion input	Dual inputs reduce PCB trace impedance and IR drop; accepts 2.9–6 V for direct connection to intermediate bus rails.
15,16 PGND	Power ground return	Dual thermal pads tied to exposed die paddle; must be solidly connected to PCB ground plane for thermal and EMI performance.

Key Features

Feature	Design Value
SmoothPWM™ Auto-Skip Eco-mode™	Enables diode-emulation (DE) and high-efficiency (HEF) modes that reduce switching loss at light loads while maintaining smooth transition into CCM under dynamic load steps.
Integrated Bootstrap Switch	Eliminates external bootstrap diode and reduces component count; supports reliable high-side FET turn-on with internal charge pump and leakage-limited VBST hold time.
Prebias Start-Up	Allows safe startup into precharged output capacitors without reverse current flow or output voltage overshoot-critical for hot-swap and multi-rail sequencing.
Soft-Stop Output Discharge	Activates internal 60-Ω discharge FET between SW and PGND during disable, rapidly collapsing V_OUT without external circuitry when VIN > 1 V.
Master-Slave Interleaving Support	Enables two-phase operation via SYNC pin to halve input ripple current and reduce required bulk capacitance in high-current applications.

Applications

5-V Step-Down Rail	3.3-V Step-Down Rail
Use Scenario: Converting 5-V intermediate bus to 3.3-V logic supply for microcontrollers, FPGAs, and communication interfaces in industrial PLCs. IC Role / Device Role / Timing Role: Primary point-of-load regulator providing tightly regulated 3.3-V output with fast transient response and seamless prebias start-up during firmware updates. Use Value: Achieves >94% efficiency at 2-A load with all-MLCC design, eliminating electrolytic capacitors and reducing board area by 30% versus discrete solutions.	Use Scenario: Generating 1.2-V core voltage for ARM Cortex-M7 processors in automotive body control modules with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency buck controller operating in HEF mode to maintain >88% efficiency at 100-mA standby load while supporting 3-A peak during CAN message bursts. Use Value: Reduces thermal rise to <15°C above ambient at full load, enabling convection-only cooling in sealed enclosures.
Multi-Phase Power Delivery	Space-Constrained Embedded Systems
Use Scenario: Dual TPS53311RGTT devices configured as master/slave to deliver 6-A total current to DDR memory subsystems in networking switches. IC Role / Device Role / Timing Role: Interleaved synchronous buck regulator pair synchronized via shared SYNC net to reduce input ripple by 50% and relax bulk capacitor requirements. Use Value: Enables use of two 22-µF X7R MLCCs instead of four, cutting solution size by 25% and improving reliability over tantalum alternatives.	Use Scenario: Powering sensor fusion modules (IMU + environmental sensors) in wearable medical devices where PCB real estate is limited to <1 cm². IC Role / Device Role / Timing Role: Compact 3-A regulator in 3 mm × 3 mm VQFN delivering 1.8-V rail with soft-start and power-good signaling for coordinated MCU wake-up. Use Value: Meets stringent 100-mA quiescent current requirement in skip mode while maintaining 0.5% output accuracy across temperature.

5-V Step-Down Rail

3.3-V Step-Down Rail

Use Scenario: Converting 5-V intermediate bus to 3.3-V logic supply for microcontrollers, FPGAs, and communication interfaces in industrial PLCs.

IC Role / Device Role / Timing Role: Primary point-of-load regulator providing tightly regulated 3.3-V output with fast transient response and seamless prebias start-up during firmware updates.

Use Value: Achieves >94% efficiency at 2-A load with all-MLCC design, eliminating electrolytic capacitors and reducing board area by 30% versus discrete solutions.

Use Scenario: Generating 1.2-V core voltage for ARM Cortex-M7 processors in automotive body control modules with strict EMI limits.

IC Role / Device Role / Timing Role: High-efficiency buck controller operating in HEF mode to maintain >88% efficiency at 100-mA standby load while supporting 3-A peak during CAN message bursts.

Use Value: Reduces thermal rise to <15°C above ambient at full load, enabling convection-only cooling in sealed enclosures.

Multi-Phase Power Delivery

Space-Constrained Embedded Systems

Use Scenario: Dual TPS53311RGTT devices configured as master/slave to deliver 6-A total current to DDR memory subsystems in networking switches.

IC Role / Device Role / Timing Role: Interleaved synchronous buck regulator pair synchronized via shared SYNC net to reduce input ripple by 50% and relax bulk capacitor requirements.

Use Value: Enables use of two 22-µF X7R MLCCs instead of four, cutting solution size by 25% and improving reliability over tantalum alternatives.

Use Scenario: Powering sensor fusion modules (IMU + environmental sensors) in wearable medical devices where PCB real estate is limited to <1 cm².

IC Role / Device Role / Timing Role: Compact 3-A regulator in 3 mm × 3 mm VQFN delivering 1.8-V rail with soft-start and power-good signaling for coordinated MCU wake-up.

Use Value: Meets stringent 100-mA quiescent current requirement in skip mode while maintaining 0.5% output accuracy across temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS53355RGLT	Higher 6-A rating, 1.5-MHz switching, integrated MOSFETs with lower R_DS(on), but larger 4 mm × 4 mm VQFN package.	Targets higher-current applications like FPGA core rails where 3-A is insufficient; requires layout revision due to different pinout and thermal pad size.	Select TPS53355RGLT only when >4-A continuous output or tighter transient response is required; not drop-in compatible.
MP2331DJ-LF-Z	3-A monolithic buck with 2.5–6-V input, 0.8-V fixed output, no PS/SYNC pins, smaller SOT-563 package, but lacks interleaving, prebias start-up, and soft-stop discharge.	Suitable for cost-sensitive, single-rail consumer electronics where feature set can be simplified; no master-slave coordination or advanced protection needed.	Choose MP2331DJ-LF-Z for fixed-output, low-BOM-cost designs where programmability and robustness are secondary to footprint and price.

Compared with TPS53311RGTT, TPS53355RGLT offers higher current and frequency at the expense of size and compatibility, while MP2331DJ-LF-Z trades configurability and protection for minimal footprint and cost-making TPS53311RGTT the optimal balance of integration, flexibility, and industrial-grade reliability in 3-A applications.

Availability

TPS53311RGTT is available at Aetrix Electronics and suitable for industrial automation controllers, embedded computing platforms, and telecom infrastructure equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TPS53311RGTT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC/DC conversion.

The TPS533xx family was designed specifically for high-density, high-reliability point-of-load regulation in industrial, computing, and communications systems-emphasizing integration, thermal performance, and robust protection in compact packages.

FAQ

What is the recommended input capacitor configuration for TPS53311RGTT?

The TPS53311RGTT datasheet specifies two 22-µF X7R ceramic capacitors placed close to the dual VIN pins (13 and 14) and PGND pads (15 and 16). This configuration minimizes high-frequency input ripple and ensures stable operation under 3-A load transients. Bulk capacitance should be supplemented with 1–10 µF ceramics near the VDD pin for analog supply filtering. Avoid electrolytic or tantalum capacitors due to ESR and lifetime limitations.

Does TPS53311RGTT support output voltages below 0.6 V?

No, TPS53311RGTT does not support output voltages below 0.6 V. Its internal reference is fixed at 0.6 V with ±1.25% tolerance, and the FB pin is designed for resistive divider feedback where V_OUT = 0.6 V × (1 + R1/R2). Attempting to set V_OUT < 0.6 V violates the device's operational specification and will result in regulation failure or undefined behavior. For sub-0.6-V outputs, consider TI's TPS62864 or similar ultra-low-V_REF regulators.

How does the PS pin configuration affect TPS53311RGTT's efficiency at light load?

The PS pin directly selects the light-load operating mode: grounding it forces FCCM (constant 1.1-MHz switching, lowest light-load efficiency), while connecting 24.3 kΩ or 174 kΩ to GND enables DE mode (variable frequency, >85% efficiency at 100 mA), and 57.6 kΩ enables HEF mode (highest light-load efficiency with adaptive frequency). In DE/HEF, the TPS53311RGTT skips pulses to reduce switching loss-verified by typical efficiency curves showing >90% at 100 mA in Skip Mode with VIN = 3.3 V.

Can TPS53311RGTT be used without an external bootstrap capacitor?

No, TPS53311RGTT requires an external bootstrap capacitor (typically 0.1 µF X7R ceramic) connected between VBST (pin 4) and SW (pins 5/6/7). The internal bootstrap switch charges this capacitor during low-side FET conduction to provide gate drive voltage for the high-side FET. Omitting it causes high-side FET failure, erratic regulation, or immediate shutdown. The capacitor must be placed within 2 mm of the IC with short, wide traces to minimize parasitic inductance.

What is the thermal performance of TPS53311RGTT in a standard 2-layer PCB layout?

In a standard 2-layer PCB with 1 oz copper, 100 mm² exposed PGND thermal pad connected to inner ground plane vias, TPS53311RGTT achieves a junction-to-ambient thermal resistance (R_θJA) of 42.8°C/W. At 3-A load and 5-V input, power dissipation is ~0.45 W, resulting in ~20°C junction rise above ambient-well within the 125°C max TJ limit. Adding thermal vias (≥8× 0.3-mm) under the exposed pad reduces R_θJA to <30°C/W for higher ambient or sustained full-load operation.

TPS53311RGTT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: SmoothPWM™, Eco-Mode™

Package/Case:: 16-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.9V

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 5.04V

Current - Output:: 3A

Frequency - Switching:: 1.1MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-VQFN (3x3)

TPS53311RGTT FAQ

1.How can I place an order for TPS53311RGTT through Aetrix?

Please submit a Request for Quotation (RFQ) for TPS53311RGTT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TPS53311RGTT reliable?

The price and inventory of TPS53311RGTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS53311RGTT is usually 5 days.

3.What payment methods are accepted for TPS53311RGTT?

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Note: Certain payment methods may incur a processing fee.

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TPS53311RGTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TPS53311RGTT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TPS53311RGTT?

For technical support, including TPS53311RGTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS53311RGTT requirements.

6.How does Aetrix verify that TPS53311RGTT is sourced from the original manufacturer or authorized distributors?

All TPS53311RGTT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS53311RGTT meets industry standards.

7.What is the process for return or replacement of TPS53311RGTT?

All TPS53311RGTT units undergo pre-shipment inspection (PSI). If there is an issue with TPS53311RGTT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TPS53311RGTT part is unused and in its original packaging.

Return procedure for TPS53311RGTT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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