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Texas Instruments TPS53321RGTT
- Part No.:
- TPS53321RGTT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
TPS53321RGTT.pdf
- Description:
- IC REG BUCK ADJ 5A 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,355
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Product details
Overview
TPS53321RGTT from Texas Instruments is a 5-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, 96% peak efficiency, and supports all-MLCC output designs for compact power delivery in point-of-load applications.
For engineers reviewing the TPS53321RGTT datasheet, TPS53321RGTT pinout, TPS53321RGTT application, or TPS53321RGTT equivalent, key selection considerations include its 3 mm × 3 mm QFN-16 package, integrated bootstrap switch, soft-stop output discharge, prebias start-up support, and master/slave interleaving capability for ripple reduction.
Technical Context
The TPS53321RGTT implements voltage-mode PWM control with five configurable operation modes-FCCM master/slave, diode emulation (DE), and high-efficiency (HEF)-selected via the PS pin resistor network. Its internal error amplifier uses a 0.6-V precision reference with ±1.25% tolerance over –40°C to 85°C and supports Type III compensation on the COMP pin.
Protection architecture includes cycle-by-cycle overcurrent detection on both FETs (6.5 A high-side, 6.8 A low-side), thermal shutdown at 140°C with 40°C hysteresis, and fast-response OVP/UVP (±17% of VREF) with sub-µs fault timing. The device integrates an internal VBST switch and supports synchronization up to ±20% of nominal frequency via the SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Continuous 5-A load capability enables single-chip power delivery for mid-power digital loads like SoCs and FPGAs. |
| Input Voltage Range | 2.9 V to 6 V supports common intermediate rails including 3.3-V and 5-V bus systems without external LDO pre-regulation. |
| Output Voltage Range | Adjustable 0.6 V to 0.84 × VIN allows precise setting of core voltages down to 0.6 V for modern processors and memory interfaces. |
| Switching Frequency | 1.1 MHz nominal (0.99–1.21 MHz) enables small external inductors and ceramic capacitors while maintaining EMI control. |
| RDS(on) | 24 mΩ (high-side, 3.3-V IN) / 19 mΩ (high-side, 5-V IN) minimizes conduction loss and improves thermal performance in dense layouts. |
| Efficiency | 96% peak efficiency and >90% at 100 mA ensures low heat generation and extended battery life in portable and always-on systems. |
| Package | 3 mm × 3 mm, 16-pin QFN (RGT) with exposed thermal pad provides low thermal resistance (RθJB = 16°C/W) for high-power density PCBs. |
Pinout & Package
The TPS53321RGTT is housed in a thermally enhanced 3 mm × 3 mm, 16-pin QFN package (RGT) with an exposed PGND thermal pad. Pin numbering follows standard top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | Active-high logic control with 1.35-MΩ internal pullup; asserts UVLO if pulled below 1.1 V. |
| 2 SYNC | Synchronization interface | Bidirectional signal for master-slave interleaving or external clock injection within ±20% of 1.1 MHz. |
| 3 PGD | Power good flag | Open-drain output indicating FB voltage is within 83–117% of 0.6-V reference; requires external pullup. |
| 4 VBST | Bootstrap supply | Connects external capacitor to SW to generate gate drive voltage for high-side MOSFET. |
| 5,6,7 SW | Switch node | Three parallel connections to internal power stage output; must be routed as single low-inductance node to inductor. |
| 8 PS | Mode configuration | Resistor-programmable pin selecting FCCM/DE/HEF mode and master/slave role (e.g., 174-kΩ = DE Master). |
| 9 COMP | Compensation node | Connects Type III compensation network to stabilize voltage-mode loop across full load and line range. |
| 10 FB | Voltage feedback | Monitors output via resistive divider; sets regulation point and triggers OVP/UVP/PGD functions. |
| 11 AGND | Analog ground | Reference for internal analog circuits; must be separated from PGND and tied at single point near IC. |
| 12 VDD | Bias supply | 2.9–3.5-V analog rail powering control circuitry; independent of main VIN path. |
| 13,14 VIN | Main input supply | Dual connections to 2.9–6-V input; reduce IR drop and improve transient response with local bulk capacitance. |
| 15,16 PGND | Power ground | High-current return path for MOSFETs and SW node; connects directly to thermal pad for optimal heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| SmoothPWM™ Auto-Skip Eco-Mode™ | Enables seamless transition between continuous and discontinuous conduction, reducing switching loss at light loads without audible noise. |
| Integrated Bootstrap Switch | Eliminates external bootstrap diode and reduces component count while maintaining reliable high-side gate drive under all operating conditions. |
| Soft-Stop Output Discharge | Activates internal 60-Ω discharge FET when EN is low, safely collapsing output voltage without external circuitry during disable or fault. |
| Prebias Start-Up Support | Allows safe startup into precharged output rails without reverse current flow or output overshoot, critical for hot-swap and multi-rail sequencing. |
| Master-Slave Interleaved Operation | Reduces input and output ripple by 50% when two TPS53321RGTT devices are synchronized, lowering required input/output capacitance. |
Applications
| 5-V Step-Down Rails | 3.3-V Step-Down Rails |
|---|---|
Use Scenario: Converting 5-V system bus to lower-core-voltage rails for microcontrollers, sensors, or communication interfaces in industrial PLCs and IoT edge nodes. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering stable, low-noise 1.2–3.3-V outputs with fast transient response to dynamic load steps. Use Value: Integrated FETs and all-MLCC design eliminate discrete MOSFETs and electrolytic capacitors, reducing BOM cost and board area by >30% versus discrete solutions. | Use Scenario: Powering FPGA I/O banks, DDR memory termination, or USB PHYs requiring tightly regulated 3.3-V supplies with minimal ripple. IC Role / Device Role / Timing Role: Synchronous buck converter providing precise 3.3-V output with <±1% regulation accuracy and 1.1-MHz switching for predictable EMI filtering. Use Value: 96% peak efficiency and >90% efficiency at 100 mA extend runtime in battery-backed systems while minimizing thermal derating. |
| Processor Core Supplies | Multi-Phase Point-of-Load |
Use Scenario: Delivering 0.6–1.2-V core voltage to ARM Cortex-A series SoCs or RISC-V processors in embedded computing modules. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting dynamic voltage scaling (DVS) via FB divider programming and fast load-step response (<10 µs). Use Value: 0.6-V reference with ±1.25% tolerance and soft-start ramp ensure accurate, glitch-free core voltage ramp during boot and sleep/wake transitions. | Use Scenario: Dual-phase 10-A solution built using two TPS53321RGTT devices in master-slave configuration for high-current ASIC or GPU power domains. IC Role / Device Role / Timing Role: Interleaved phase controller synchronizing PWM edges with 180° offset to halve input/output ripple current and improve thermal distribution. Use Value: Eliminates need for external phase controllers or complex timing ICs-interleaving is handled autonomously via SYNC pin handshake. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS53355RGLT | Higher 6-A rating, 1.5-MHz switching, improved light-load efficiency via D-CAP3 control, but no HEF mode. | Better suited for higher-current, faster-transient applications where footprint increase is acceptable. | Select TPS53355RGLT when >5-A output or tighter transient response is required; not pin-compatible with TPS53321RGTT. |
| MP2315GJ-Z | Monolithic 6-A buck with 2.2-MHz switching, smaller 2 mm × 2 mm QFN, but lacks interleaving, prebias start-up, and VDD bias rail separation. | Ideal for space-constrained consumer electronics where ultra-small size outweighs advanced sequencing features. | Choose MP2315GJ-Z for compact, cost-sensitive designs lacking master-slave or soft-stop requirements; different pinout and layout. |
Compared with TPS53321RGTT, TPS53355RGLT delivers higher current and faster control but sacrifices HEF mode and pin compatibility, while MP2315GJ-Z offers miniaturization at the expense of sequencing flexibility and thermal robustness in high-power scenarios.
Availability
TPS53321RGTT is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and communications infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS53321RGTT 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 TPS53321RGTT belongs to TI's Power Management Integrated Circuits (PMIC) portfolio, designed specifically for high-density, high-efficiency point-of-load regulation in computing, networking, and industrial control systems.
FAQ
What is the maximum output current supported by the TPS53321RGTT?
The TPS53321RGTT supports continuous 5-A output current under recommended operating conditions (TA ≤ 85°C, proper thermal layout). Peak current capability reaches 6.5 A before overcurrent protection activates. Derating applies above 85°C ambient or with insufficient PCB copper area; thermal performance is optimized using the exposed PGND pad and recommended layout guidelines in the datasheet.
Does the TPS53321RGTT support prebias start-up?
Yes, the TPS53321RGTT supports prebias start-up, allowing safe activation into an already charged output rail without reverse current flow or output voltage overshoot. This feature is enabled by default and requires no external configuration. During prebias start-up, the internal low-side FET remains off until the FB voltage rises above the UVLO threshold, preventing energy backflow from the output capacitor.
How does the PS pin configure operation modes on the TPS53321RGTT?
The PS pin on the TPS53321RGTT selects among five operation modes via resistor-to-ground: GND = FCCM Slave, 24.3 kΩ = DE Slave, 57.6 kΩ = HEF Mode, 174 kΩ = DE Master, floating or pulled to VDD = FCCM Master. Each configuration determines whether the device operates in forced continuous conduction, diode emulation, or high-efficiency mode-and whether it acts as master or slave in interleaved setups.
What protection features are integrated into the TPS53321RGTT?
The TPS53321RGTT integrates overcurrent (OCP), overvoltage (OVP), undervoltage (UVP), overtemperature (OTP), and input UVLO protections. OCP monitors both high- and low-side FET currents with hiccup-mode recovery. OVP/UVP respond within 1–11 µs to FB deviations beyond ±17% of 0.6 V. OTP shuts down the device at 140°C with 40°C hysteresis. All protections are fully autonomous and require no external components.
Can the TPS53321RGTT be synchronized to an external clock source?
Yes, the TPS53321RGTT can synchronize to an external clock via the SYNC pin, accepting frequencies within ±20% of its nominal 1.1-MHz switching frequency (0.88–1.32 MHz). The falling edge of the external SYNC signal triggers the rising edge of the internal PWM pulse. When used in slave mode, the device maintains synchronization even if the master fails, reverting to its internal oscillator after a brief timeout.
TPS53321RGTT 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:
- 5A
- 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)
TPS53321RGTT FAQ
1.How can I place an order for TPS53321RGTT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS53321RGTT 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 TPS53321RGTT reliable?
The price and inventory of TPS53321RGTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS53321RGTT is usually 5 days.
3.What payment methods are accepted for TPS53321RGTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS53321RGTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS53321RGTT?
TPS53321RGTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS53321RGTT 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 TPS53321RGTT?
For technical support, including TPS53321RGTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS53321RGTT requirements.
6.How does Aetrix verify that TPS53321RGTT is sourced from the original manufacturer or authorized distributors?
All TPS53321RGTT 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 TPS53321RGTT meets industry standards.
7.What is the process for return or replacement of TPS53321RGTT?
All TPS53321RGTT units undergo pre-shipment inspection (PSI). If there is an issue with TPS53321RGTT, 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 TPS53321RGTT part is unused and in its original packaging.
Return procedure for TPS53321RGTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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