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Texas Instruments TPS53511RGTR
- Part No.:
- TPS53511RGTR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
TPS53511RGTR.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
TPS53511 from Texas Instruments is a 1.5-A synchronous step-down buck converter with integrated high- and low-side N-channel MOSFETs, D-CAP2™ adaptive on-time control, 4.5-V to 18-V input range, 700-kHz switching frequency, and open-drain power-good output - deployed in server point-of-load (POL) rails.
For engineers reviewing the TPS53511 datasheet, TPS53511 pinout, TPS53511 application, or TPS53511 equivalent, this page delivers verified functional identity, validated pin roles, confirmed thermal and efficiency behavior at 1.05 V/1.5 A, and real-world soft-start and protection timing values - all critical for computing power system design validation.
Technical Context
The TPS53511 implements D-CAP2™ adaptive on-time control without external compensation, enabling fast transient response and seamless transition between PWM and auto-skip modes. Its internal circuitry supports ultra-low-ESR ceramic and polymer capacitors via ripple-simulation ramp and zero-current detection.
It integrates dual N-channel MOSFETs (RDS(on)H = 120 mΩ, RDS(on)L = 70 mΩ), internal 5-V LDO (VREG5), bootstrap switch, and cycle-by-cycle overcurrent protection using PGND–SW voltage sensing - all operating across –40°C to 85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Continuous 1.5 A - supports full-load operation in compact POL rails without external current sense or heatsink. |
| Input voltage range | 4.5 V to 18 V - compatible with 5 V, 12 V, and 15 V intermediate bus architectures in servers and networking gear. |
| Switching frequency | 700 kHz nominal - enables small magnetics and tight layout while maintaining >85% efficiency at 1.05 V/1.5 A. |
| Control mode | D-CAP2™ adaptive on-time - eliminates loop compensation components and ensures stability with MLCC-only output filters. |
| Power-good output | Open-drain PG with ±10% window and 10-µs fault delay - provides reliable system sequencing and rail monitoring without pull-up dependency. |
| Soft-start | Adjustable via external capacitor (CSS) - enables controlled ramp-up and pre-biased start-up to prevent output sinking during hot-insertion. |
| Thermal shutdown | 150°C trip with 25°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
TPS53511 is housed in a thermally enhanced 3.0 mm × 3.0 mm, 16-pin QFN package (RGT) with exposed PowerPAD™ soldered to PGND for optimal thermal dissipation (θJCbot = 3.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 13,14) | High-side FET drain input | Dual VIN pins reduce trace inductance and improve high-frequency current return path for stable 18-V operation. |
| SW (Pins 9,10,11) | Switch node | Three parallel SW pins minimize switching node impedance and EMI generation during 1.5-A transitions. |
| PGND (Pins 7,8) | Low-side FET source & current sense reference | Dual PGND pins provide dedicated current-sense return path independent of signal ground, reducing noise coupling into VFB. |
| VFB (Pin 1) | Feedback input | Monitors output via resistor divider; threshold is 765 mV ±2 mV (–40°C to 85°C), enabling precise 1.05-V regulation. |
| EN (Pin 6) | Enable control | Logic-compatible input with 1.5-V high threshold; supports sequencing with upstream regulators or microcontroller GPIO. |
| PG (Pin 5) | Power-good indicator | Open-drain output active after 1.7× soft-start time when VFB stays within ±10% of target - used for system enable/disable coordination. |
| VREG5 (Pin 2) | Internal 5-V LDO output | Supplies gate drivers and logic; delivers up to 70 mA with ±200 mV line/load regulation - eliminates need for external bias rail. |
| VBST (Pin 12) | Bootstrap supply | Internally diode-connected to VREG5; requires external 0.1-µF ceramic capacitor to SW for high-side gate drive integrity. |
| SS (Pin 3) | Soft-start timing | 2-µA constant-current source charges external capacitor; start time = 0.765 × CSS(nF) ms - enables programmable ramp rate and pre-bias compatibility. |
| VO (Pin 16) | On-time adjustment input | Connects directly to output; used internally to scale on-time inversely with input voltage and proportionally with output voltage. |
| VCC (Pin 15) | Control circuit supply | Accepts 4.5–18 V; powers internal logic and regulators - allows single-rail biasing without separate 5-V supply. |
| GND (Pin 4) | Signal ground | Separate from PGND; must be tied strongly to PGND near device to avoid ground bounce in feedback path. |
| PowerPAD™ | Thermal pad | Must be soldered to PGND plane; accounts for >90% of heat transfer - required for 1.5-A continuous operation at 85°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ control | Enables <10-µs load transient recovery with no external compensation - reduces BOM count and layout sensitivity vs. voltage-mode controllers. |
| Auto-skip light-load mode | Extends efficiency to >80% at 10-mA load by entering discontinuous conduction - critical for low-power standby states in server SoCs. |
| Integrated bootstrap switch | Eliminates external bootstrap diode and capacitor - simplifies layout and improves reliability in space-constrained POL modules. |
| Pre-biased soft-start | Prevents reverse current flow during hot-plug events by ramping low-side gate drive duty cycle - avoids output voltage collapse on powered-backplane insertion. |
| Output discharge function | 50-Ω internal MOSFET discharges VO to PGND when disabled - ensures safe power-down sequencing without external bleed resistors. |
| Cycle-by-cycle OCL | Uses PGND–SW voltage sensing with temperature-compensated RDS(on) - achieves 1.65–2.75-A current limit accuracy without sense resistor or calibration. |
Applications
| Server Point-of-Load Rail | Distributed DC-DC Converter |
|---|---|
Use Scenario: Providing 1.05-V/1.5-A power to CPU I/O or memory interface circuits in 1U rack servers with strict thermal and footprint constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated POL voltage with sub-10-µs transient response to handle bursty I/O loads. Use Value: Enables use of only MLCC output capacitors (no POSCAP/SP-CAP), reducing board area by 30% and eliminating ESR-related aging concerns. | Use Scenario: Non-isolated 12-V-to-1.2-V conversion in modular telecom line cards where multiple independent rails feed FPGA banks and SerDes transceivers. IC Role / Device Role / Timing Role: Standalone step-down regulator with adjustable soft-start and power-good signaling for coordinated multi-rail power sequencing. Use Value: Pre-biased soft-start prevents back-driving of adjacent powered rails during field-replaceable module insertion - avoids system reset or data corruption. |
| Industrial Computing Module | Embedded Network Processor Supply |
Use Scenario: Powering ARM-based industrial controllers operating in –40°C to 85°C environments with limited airflow and no forced cooling. IC Role / Device Role / Timing Role: Thermally robust buck converter leveraging PowerPAD™ and low-RDS(on) FETs to sustain 1.5-A load without derating. Use Value: 150°C thermal shutdown with 25°C hysteresis ensures graceful shutdown and automatic recovery upon cooldown - eliminates need for external thermal monitoring. | Use Scenario: Generating clean 1.8-V core supply for network processors in edge routers handling 10-Gbps packet processing. IC Role / Device Role / Timing Role: High-efficiency, low-noise POL regulator with 700-kHz fixed-frequency operation to simplify EMI filtering around sensitive analog PHY sections. Use Value: Low output ripple (<3% of VOUT at 1.5 A) and internal ripple-simulation ramp ensure stable regulation even with 10-µF total MLCC capacitance - cuts BOM cost by 40% vs. traditional designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS53355DQPR | 3-A rated, 4.5–25-V input, 500-kHz fixed frequency, no VREG5 LDO output | Higher current capacity but lacks integrated 5-V bias rail - requires external LDO for gate drive if VCC not available | Choose when >1.5-A output or wider input range is needed; verify external bias capability for VBST. |
| MP2315GJ-Z | 2-A rated, 4.5–28-V input, 500-kHz fixed frequency, no D-CAP2™ or pre-biased soft-start | Lower cost but no adaptive control or pre-bias support - unsuitable for hot-plug or fast-transient systems | Choose for cost-sensitive non-server applications where transient performance and sequencing are less critical. |
Compared with TPS53511, TPS53355DQPR offers higher current headroom but removes integrated VREG5, increasing system complexity; MP2315GJ-Z trades D-CAP2™ responsiveness and pre-bias safety for lower unit cost - making TPS53511 optimal for thermally constrained, sequenced POL rails in computing infrastructure.
Availability
TPS53511 is available at Aetrix Electronics and suitable for server point-of-load rails, distributed DC-DC converters, and industrial embedded computing modules requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for TPS53511 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 for enterprise and industrial systems.
The TPS53511 belongs to TI's D-CAP2™ synchronous buck regulator product line, engineered specifically for high-density, low-noise point-of-load applications in servers, networking equipment, and embedded computing platforms where fast transient response and minimal external components are essential.
FAQ
What is the maximum continuous output current supported by the TPS53511?
The TPS53511 supports continuous 1.5-A output current under recommended operating conditions (–40°C to 85°C ambient, proper PCB thermal design with PowerPAD™ soldered to PGND). This rating is validated with 3.3-µH inductor and 10-µF MLCC output capacitance at 12-V input and 1.05-V output. Exceeding 1.5 A triggers cycle-by-cycle overcurrent protection.
Does the TPS53511 require external compensation components for stability?
No, the TPS53511 does not require external compensation components. Its D-CAP2™ adaptive on-time control architecture embeds internal compensation and ripple-simulation circuitry, enabling stable operation with only ceramic output capacitors - verified across 1-µF to 100-µF MLCC ranges and ESR down to 1 mΩ.
How does the TPS53511 handle pre-biased outputs during startup?
The TPS53511 implements pre-biased soft-start by detecting when the internal soft-start voltage exceeds the feedback voltage (VFB). It then incrementally increases low-side FET on-time cycle-by-cycle - preventing reverse current flow and ensuring smooth ramp-up without pulling down an already-powered rail. This behavior is confirmed in Figure 6-6 of the datasheet.
What is the purpose of the VO pin on the TPS53511?
VO (Pin 16) is the on-time adjustment input. It connects directly to the output voltage node and feeds into the adaptive on-time control block. The TPS53511 uses VO and VIN to dynamically scale its on-time - keeping switching frequency near 700 kHz across input and output voltage variations - as detailed in Section 7.3.2 of the datasheet.
Can the TPS53511 operate with a 5-V input supply?
Yes, the TPS53511 operates with a minimum input voltage of 4.5 V, making it fully compatible with 5-V intermediate bus systems. At 5-V input, the device maintains regulation down to 2-V output (per datasheet Section 1), supports full 1.5-A load, and delivers >88% efficiency at 1.05-V/1.5-A per Figure 6-7 typical characteristics.
TPS53511RGTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™
- 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):
- 2V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
TPS53511RGTR FAQ
1.How can I place an order for TPS53511RGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS53511RGTR 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 TPS53511RGTR reliable?
The price and inventory of TPS53511RGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS53511RGTR is usually 5 days.
3.What payment methods are accepted for TPS53511RGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS53511RGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS53511RGTR?
TPS53511RGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS53511RGTR 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 TPS53511RGTR?
For technical support, including TPS53511RGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS53511RGTR requirements.
6.How does Aetrix verify that TPS53511RGTR is sourced from the original manufacturer or authorized distributors?
All TPS53511RGTR 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 TPS53511RGTR meets industry standards.
7.What is the process for return or replacement of TPS53511RGTR?
All TPS53511RGTR units undergo pre-shipment inspection (PSI). If there is an issue with TPS53511RGTR, 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 TPS53511RGTR part is unused and in its original packaging.
Return procedure for TPS53511RGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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