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Texas Instruments TPS53353DQPT
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- Part No.:
- TPS53353DQPT
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerLFDFN
- Datasheet:
-
TPS53353DQPT.pdf
- Description:
- IC REG BUCK ADJ 20A 22LSON-CLIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,670
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Product details
Overview
TPS53353 from Texas Instruments is a D-CAP™ mode, 20-A synchronous buck DC-DC converter with integrated NexFET™ power MOSFETs (5.5 mΩ high-side / 2.2 mΩ low-side), 0.6 V ±0.5% reference, and Eco-mode™ for light-load efficiency. It operates from 1.5 V to 15 V input, delivers 0.6 V to 5.5 V output, and targets point-of-load regulation in server CPU/GPU core rails.
For engineers reviewing the TPS53353 datasheet, TPS53353 pinout, TPS53353 application, or TPS53353 equivalent, key selection factors include its adaptive on-time D-CAP™ control for ultra-fast transient response, selectable 250 kHz–1 MHz switching frequency via RF pin resistor, auto-skip vs. FCCM operation mode selection via MODE pin, and integrated 5-V LDO (VREG) for internal biasing and gate drive support.
Technical Context
The TPS53353 implements adaptive on-time D-CAP™ control that eliminates external compensation by sensing output capacitor ESR ripple, enabling fast load-step response without loop tuning. Its switching frequency is set by an external resistor on the RF pin-eight discrete values between 250 kHz and 1 MHz are supported via connections to GND or VREG.
It features dual-mode operation: auto-skip Eco-mode™ for high light-load efficiency (<10 µA shutdown current) and forced continuous conduction mode (FCCM) for low-noise, fixed-frequency behavior. Soft-start time (0.7–5.6 ms) and overcurrent threshold (adjustable via TRIP pin with thermal compensation) are both resistor-programmable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 20 A continuous-supports high-current ASIC/FPGA core rails without external MOSFETs. |
| Input voltage range | 1.5 V to 15 V conversion input-enables direct use of intermediate bus voltages like 3.3 V, 5 V, or 12 V. |
| Output voltage range | 0.6 V to 5.5 V-covers modern processor core (0.6–1.2 V), I/O (1.8–3.3 V), and auxiliary (5 V) rails. |
| Reference accuracy | ±0.5% at 0.6 V (–40°C to 85°C)-ensures tight output regulation critical for low-voltage digital loads. |
| Switching frequency | 250 kHz to 1 MHz, resistor-selectable-balances size (inductor/capacitor), efficiency, and EMI across designs. |
| Efficiency | 92% at 12 V → 1.5 V, 20 A-minimizes thermal stress and power loss in dense server PCB layouts. |
| Shutdown current | <10 µA-enables ultra-low-power system standby states without compromising wake-up latency. |
Pinout & Package
The TPS53353 is housed in a thermally enhanced 22-pin LSON-CLIP (QFN) package measuring 6.0 mm × 5.0 mm with exposed PowerPAD™ for optimal heat dissipation. Pin functions are validated per TI SLUSAK2D Rev D (April 2021).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB | Feedback input | Connects to resistor divider on VOUT; regulates output using internal 0.6-V reference with ±0.5% accuracy. |
| EN | Enable control | Active-high logic input (1.8 V turn-on, 0.95 V turn-off); controls startup/shutdown sequencing and VREG LDO activation. |
| PGOOD | Power-good flag | Open-drain output with 1-ms delay after regulation; signals valid output to host controller or sequencer. |
| VBST | Bootstrap supply | Supplies high-side gate driver; requires external bootstrap capacitor tied to LL (switch node) for proper high-side FET turn-on. |
| TRIP | OCP threshold setting | Sets current limit via external resistor; sources 10 µA (4700 ppm/°C) to generate VOCL = VTRIP/32 for thermal-compensated OCP. |
| MODE | Soft-start & mode select | Resistor-programmable pin selecting both soft-start time (0.7–5.6 ms) and light-load operation (auto-skip or FCCM). |
| RF | Frequency selection | Resistor-to-GND/VREG sets one of eight switching frequencies (250 kHz–1 MHz); open circuit defaults to 500 kHz. |
| VDD | Bias supply input | 4.5 V–25 V input powering internal logic and drivers; independent from main VIN rail for flexible power architecture. |
| VREG | 5-V LDO output | Supplies internal analog circuitry and gate drivers; capable of sourcing up to 30 mA with 230-mV dropout at full load. |
| VIN | Main power input | Six parallel pins (12–17) reduce IR drop and thermal resistance for high-current 1.5 V–15 V input path. |
| LL | Power output | Switch-node output connected to inductor; six parallel pins (6–11) minimize conduction loss and improve thermal performance. |
| GND | Ground & thermal pad | Primary ground return and thermal interface; PowerPAD™ must be soldered with multiple vias to inner ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP™ adaptive on-time control | Eliminates external compensation components and enables sub-10-µs load transient response without loop tuning. |
| Eco-mode™ auto-skip operation | Reduces switching losses at light loads, achieving >85% efficiency down to 100 mA while maintaining <10 µA shutdown current. |
| Integrated 5-V LDO (VREG) | Provides regulated bias for internal circuitry and gate drivers, removing need for external bias supply and simplifying BOM. |
| Programmable overcurrent protection | TRIP pin allows resistor-based OCP threshold setting with built-in thermal coefficient (4700 ppm/°C) for stable current limiting across temperature. |
| Pre-biased start-up capability | Supports hot-plug and rail-sequencing applications by safely starting into pre-charged output capacitors without reverse current flow. |
| All-ceramic capacitor support | Stable operation with low-ESR ceramic output capacitors only-reduces board area, cost, and improves reliability versus electrolytic solutions. |
Applications
| Enterprise Server Core Rail | Networking ASIC Power |
|---|---|
Use Scenario: Regulating 0.85 V @ 18 A for dual-socket Xeon Scalable CPU cores in 1U rack servers with strict thermal envelope. IC Role / Device Role / Timing Role: Primary point-of-load (POL) buck regulator delivering tightly regulated core voltage with <±5 mV static error and <10 µs transient recovery. Use Value: Integrated 5.5 mΩ/2.2 mΩ MOSFETs and D-CAP™ control enable 92% peak efficiency and sub-10-µs load step response without external compensation. | Use Scenario: Supplying 1.0 V @ 15 A to multi-core network processors (e.g., Broadcom BCM880xx) in 100G line cards with high-density layout constraints. IC Role / Device Role / Timing Role: High-current POL converter operating in FCCM mode to suppress audible noise and ensure deterministic timing margins under burst traffic loads. Use Value: Resistor-programmable soft-start (0.7–5.6 ms) and precise 0.6 V reference (±0.5%) guarantee controlled ramp-up and stable core voltage during packet-processing surges. |
| FPGA I/O Bank Supply | Data Center SSD Controller Rail |
Use Scenario: Generating 1.8 V @ 12 A for FPGA I/O banks in AI inference accelerators requiring simultaneous multi-rail sequencing and low-noise operation. IC Role / Device Role / Timing Role: Secondary POL regulator supporting programmable voltage tracking and independent enable control via EN pin for coordinated power-up. Use Value: Open-drain PGOOD with 1-ms delay and VREG LDO output simplify integration into multi-rail PMIC sequences and eliminate need for external supervisors. | Use Scenario: Delivering 3.3 V @ 8 A to NVMe SSD controllers in hyperscale storage arrays where efficiency at partial load directly impacts annual energy cost. IC Role / Device Role / Timing Role: High-efficiency POL converter operating in Eco-mode™ to maintain >88% efficiency at 1–2 A load while supporting rapid wake-from-idle transitions. Use Value: Auto-skip mode reduces quiescent current to <10 µA in shutdown and maintains >85% efficiency down to 100 mA, extending idle battery life in edge storage nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS53355DQPT | Same 22-pin QFN package and pinout; supports higher 25-A output current and wider 0.6–7 V output range; includes differential remote sense. | Targeted at higher-current CPU/GPU rails where remote sensing improves regulation accuracy under PCB IR drop. | Select when output current exceeds 20 A or remote voltage sensing is required for <±10 mV load regulation. |
| TPS548B28RHLR | Newer 16-V, 20-A device in smaller 4-mm × 4-mm QFN; adds remote sense, improved light-load efficiency, and lower RDS(on) (3.2 mΩ/1.4 mΩ). | Optimized for next-gen data center applications demanding higher power density and tighter thermal management. | Select for new designs prioritizing footprint reduction, remote sensing, and extended light-load efficiency-requires PCB redesign due to different package and pinout. |
Compared with TPS53353, TPS53355DQPT offers higher current headroom and remote sensing for precision regulation, while TPS548B28RHLR provides superior power density and efficiency in a smaller package-but neither is pin-compatible, requiring layout changes and validation of sequencing, compensation, and thermal design.
Availability
TPS53353 is available at Aetrix Electronics and suitable for enterprise server power delivery, networking switch ASIC supplies, and FPGA I/O voltage regulation requiring stable component supply across long production lifecycles.
Supply support for TPS53353 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 ICs, with decades of expertise in high-efficiency DC-DC conversion.
The TPS53353 belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-current, low-voltage point-of-load applications in computing, communications, and enterprise infrastructure where fast transient response and minimal external components are critical.
FAQ
What is the maximum continuous output current supported by the TPS53353?
The TPS53353 supports 20 A of continuous output current at ambient temperatures up to 85°C with appropriate PCB thermal design. This rating assumes use of the recommended 6 mm × 5 mm LSON-CLIP package with PowerPAD™ soldered to a 4-layer board having ≥4 thermal vias under the pad and adequate copper area per TI SLUSAK2D guidelines.
Does the TPS53353 require external compensation components?
No, the TPS53353 does not require external compensation components. Its D-CAP™ control architecture uses the output capacitor's ESR to sense inductor current, enabling stable operation with all-ceramic output capacitors and eliminating the need for external RC networks or loop compensation design.
How is the switching frequency selected on the TPS53353?
The switching frequency of the TPS53353 is selected by connecting an external resistor between the RF pin and either GND or VREG. Eight discrete frequencies from 250 kHz to 1 MHz are supported-including 250 kHz, 300 kHz, 400 kHz, 500 kHz (open circuit), 650 kHz, 750 kHz, 850 kHz, and 970 kHz-as specified in Table 7-1 of the TPS53353 datasheet.
Can the TPS53353 start up into a pre-biased output voltage?
Yes, the TPS53353 supports pre-biased start-up. When enabled, it safely ramps the output from a pre-charged state without forcing reverse current through the output capacitors-critical for hot-swap and multi-rail sequencing applications where output rails may already be energized.
What protection features are integrated into the TPS53353?
The TPS53353 integrates overvoltage protection (OVP), undervoltage protection (UVP), overtemperature shutdown (145°C), adjustable overcurrent protection (via TRIP pin), input UVLO (on VREG), and open-drain PGOOD monitoring. All protections feature defined thresholds, propagation delays, and hysteresis per Section 6.5 of the TPS53353 datasheet.
TPS53353DQPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP™, Eco-Mode™
- Package/Case:
- 22-PowerLFDFN
- 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):
- 1.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 20A
- Frequency - Switching:
- 250kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-LSON-CLIP (6x5)
TPS53353DQPT FAQ
1.How can I place an order for TPS53353DQPT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS53353DQPT 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 TPS53353DQPT reliable?
The price and inventory of TPS53353DQPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS53353DQPT is usually 5 days.
3.What payment methods are accepted for TPS53353DQPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS53353DQPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS53353DQPT?
TPS53353DQPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS53353DQPT 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 TPS53353DQPT?
For technical support, including TPS53353DQPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS53353DQPT requirements.
6.How does Aetrix verify that TPS53353DQPT is sourced from the original manufacturer or authorized distributors?
All TPS53353DQPT 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 TPS53353DQPT meets industry standards.
7.What is the process for return or replacement of TPS53353DQPT?
All TPS53353DQPT units undergo pre-shipment inspection (PSI). If there is an issue with TPS53353DQPT, 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 TPS53353DQPT part is unused and in its original packaging.
Return procedure for TPS53353DQPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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