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Texas Instruments TPS54521RHLR
- Part No.:
- TPS54521RHLR
- Manufacturer:
- Texas Instruments
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
TPS54521RHLR.pdf
- Description:
- IC REG BUCK ADJ 5A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,906
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Product details
Overview
TPS54521RHLR from Texas Instruments is a 4.5V–17V input, 5A synchronous step-down DC/DC converter with integrated 57mΩ/50mΩ MOSFETs, 0.8V reference, and adjustable 200–900kHz switching frequency. It delivers regulated 1.8V/3.3V/5V outputs for high-density power distribution in netbooks and set-top boxes.
For engineers reviewing the TPS54521RHLR datasheet, TPS54521RHLR pinout, TPS54521RHLR application, or TPS54521RHLR equivalent, key selection factors include its split-rail PVIN/VIN architecture, hiccup overcurrent protection, monotonic startup into prebiased loads, and thermal shutdown at 140°C–150°C.
Technical Context
The TPS54521RHLR implements fixed-frequency peak current mode control with internal slope compensation to prevent subharmonic oscillation across 0–100% duty cycle. Its transconductance error amplifier (1300 μA/V) drives COMP to regulate VSENSE against either the 0.8V reference or SS/TR voltage.
It supports dual-input operation: VIN (4.5–17V) powers control circuitry while PVIN (1.6–17V) supplies the power stage; EN pin enables UVLO adjustment via external resistors, and RT/CLK accepts either an RT resistor or external clock (200–900kHz) with automatic PLL synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN: 4.5–17V; PVIN: 1.6–17V - Enables split-rail designs for improved efficiency in 12V bus systems. |
| Output Current | 5A continuous - Supports high-current rails for processors and FPGAs without external current sharing. |
| Switching Frequency | 200–900kHz - Adjustable via RT resistor or external clock; higher frequencies reduce inductor size. |
| Reference Voltage | 0.8V ±3% (0.776–0.824V) - Sets minimum output voltage; enables precise 1.2V, 1.8V, 3.3V, 5V regulation. |
| Quiescent Current | 2μA shutdown; 600–800μA non-switching - Minimizes standby loss in battery-backed or always-on systems. |
| Thermal Shutdown | 140–150°C with 5°C hysteresis - Protects die during overload; restarts automatically after junction cools. |
| Power Good Accuracy | ±3% VREF window (94–106%) - Provides reliable system-level power sequencing and fault detection. |
Pinout & Package
TPS54521RHLR uses a thermally enhanced 14-pin QFN package (3.5mm × 3.5mm), with exposed thermal pad soldered to PCB ground for optimal thermal performance (θJCbot = 3.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT/CLK | Frequency control & sync input | Selects switching frequency (200–900kHz) via resistor or synchronizes to external clock falling edge. |
| GND (Pins 2,3) | Signal & low-side return | Provides common reference for control logic and low-side MOSFET source; connects to thermal pad. |
| PVIN (Pins 4,5) | Power switch supply rail | Feeds high-/low-side MOSFETs; supports down to 1.6V for partial-rail applications like DDR memory supplies. |
| VIN (Pin 6) | Control circuit supply | Supplies bias to internal regulators and logic; must be ≥4.5V even if PVIN is lower. |
| VSENSE (Pin 7) | Error amplifier inverting input | Monitors output via resistor divider; compared to 0.8V reference or SS/TR voltage for regulation. |
| COMP (Pin 8) | Error amplifier output | Drives current-mode comparator; requires external RC network for loop stability and phase margin. |
| SS/TR (Pin 9) | Soft-start & tracking reference | 2.3μA internal current charges external capacitor; overrides internal reference for sequencing or prebias startup. |
| EN (Pin 10) | Enable & UVLO control | 1.21V rising threshold; internal 1.15μA pull-up allows floating enable or resistor-divider UVLO adjustment. |
| PH (Pins 11,12) | Switch node | Connects to inductor and BOOT capacitor; carries full switching waveform; dual pins reduce resistance. |
| BOOT (Pin 13) | High-side gate drive supply | Requires 0.1μF X7R/X5R ceramic cap to PH; BOOT-PH UVLO (2.1–3V) prevents high-side failure. |
| PWRGD (Pin 14) | Open-drain power-good flag | Pulls low on undervoltage (91% VREF), overvoltage (109% VREF), thermal shutdown, or EN deassertion. |
| Exposed Thermal Pad | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; primary heat path (θJCbot = 3.2°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 57mΩ high-side / 50mΩ low-side RDS(on) - Eliminates external switches; enables compact 5A design with >90% efficiency at 12V→3.3V. |
| Split Power Rail | VIN (4.5–17V) + PVIN (1.6–17V) - Allows independent optimization: e.g., 12V for power stage, 3.3V for control logic. |
| Hiccup Overcurrent Protection | 7–9A high-side limit + 6–8A low-side sourcing limit - Latches off for 16384 cycles after 512-cycle overload; prevents thermal runaway. |
| Monotonic Prebias Startup | SS/TR > VSENSE required before low-side turn-on - Prevents output discharge when powering up into existing 3.3V/5V rails. |
| Adjustable Slow Start | 2.3μA SS/TR charge current - Enables precise ramp time control (e.g., 10ms with 10nF) for sequencing across multiple rails. |
Applications
| Flat Panel Digital TVs | Set-Top Boxes & PVRs |
|---|---|
Use Scenario: Powering SoC core, DDR memory, and video processing ICs from a 12V main rail. IC Role / Device Role / Timing Role: Primary 3.3V/1.2V buck regulator delivering 5A continuous current with tight transient response. Use Value: Integrated MOSFETs and 500kHz switching enable <1cm² solution size; PWRGD signals system reset controller upon brownout. |
Use Scenario: Generating 1.8V for tuners and 5V for USB peripherals in space-constrained enclosures. IC Role / Device Role / Timing Role: Dual-output capable via sequencing (SS/TR + EN); supports hot-plug USB power management. Use Value: Split-rail PVIN/VIN allows 5V PVIN + 12V VIN configuration; hiccup protection avoids catastrophic failure during cable short events. |
| Net Books | High-Density 3.3V/5V Distribution |
Use Scenario: Core voltage regulation for Intel Atom or ARM-based mobile processors with dynamic load steps. IC Role / Device Role / Timing Role: Synchronous buck converter with 2μA shutdown quiescent current for battery runtime extension. Use Value: Monotonic startup prevents reverse current into prebiased CPU I/O rails; thermal shutdown ensures safe operation in sealed chassis. |
Use Scenario: Distributed point-of-load conversion from 12V backplane to multiple 3.3V/5V subsystems. IC Role / Device Role / Timing Role: High-efficiency, thermally robust regulator supporting parallel operation via RT/CLK synchronization. Use Value: 3.5mm × 3.5mm QFN with exposed pad achieves 32°C/W θJA; synchronized switching reduces EMI in multi-rail systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54620RHLR | 6A rating, same 14-pin QFN package, pin-to-pin compatible per datasheet; higher current capability but identical control architecture. | Preferred where >5A peak load or future-proofing headroom is required; no layout change needed. | Select TPS54620RHLR only if sustained >5A output or tighter transient response under 6A step is confirmed. |
| LM27402SDX/NOPB | 4.5–20V input, 5A, but uses external MOSFETs; no integrated power stage; requires additional gate drivers and layout area. | Suitable for designs needing custom MOSFET selection (e.g., ultra-low RDS(on), high-temp operation) or discrete thermal management. | Choose LM27402SDX/NOPB only when external FETs are mandated for reliability, thermal isolation, or specific SOA requirements. |
Compared with TPS54521RHLR, TPS54620RHLR offers higher current headroom in identical footprint, while LM27402SDX/NOPB trades integration for flexibility-neither provides drop-in replacement without validation of thermal, EMI, and transient behavior.
Availability
TPS54521RHLR is available at Aetrix Electronics and suitable for flat panel digital TVs, set-top boxes, and net books requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54521RHLR 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 TPS54521RHLR belongs to TI's SWIFT™ family of integrated power converters, designed specifically for space-constrained, high-current applications demanding minimal external components and robust protection features.
FAQ
What is the maximum continuous output current supported by the TPS54521RHLR?
The TPS54521RHLR supports 5A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its integrated 57mΩ/50mΩ MOSFETs and 3.5mm × 3.5mm QFN with exposed thermal pad enable this rating without external current sharing. Derating applies above 85°C ambient or with inadequate copper area/vias.
Does the TPS54521RHLR support synchronization to an external clock signal?
Yes, the TPS54521RHLR supports external clock synchronization via the RT/CLK pin. When a square wave clock (20–80% duty cycle, 0.8V–2.0V transitions) is applied, its internal PLL locks to frequencies between 200kHz and 900kHz, aligning the PH switching edge to the falling edge of the external clock-critical for EMI reduction in multi-rail systems.
How does the TPS54521RHLR handle startup into a prebiased output voltage?
The TPS54521RHLR ensures monotonic startup into prebiased outputs by disabling the low-side MOSFET until the SS/TR pin voltage exceeds the VSENSE pin voltage. This prevents reverse current flow and output discharge. The SS/TR pin's 2.3μA internal charge current enables controlled ramping, making TPS54521RHLR suitable for hot-swap and sequenced power systems.
What is the purpose of the split PVIN and VIN pins on the TPS54521RHLR?
The split PVIN (1.6–17V) and VIN (4.5–17V) pins allow independent power routing: PVIN supplies the power stage (high-/low-side MOSFETs), while VIN powers the control circuitry. This enables efficient partial-rail operation-e.g., using 3.3V for control logic and 12V for the power stage-reducing losses and improving light-load efficiency in the TPS54521RHLR.
Can the TPS54521RHLR operate at 100% duty cycle, and what limits this capability?
Yes, the TPS54521RHLR can operate at 100% duty cycle as long as the BOOT-PH voltage remains above its UVLO threshold (typically 2.1V). This is enabled by the integrated boot recharge circuit, which pulls PH low to refresh the BOOT capacitor. Minimum controllable on-time (97ns typical) and BOOT-PH UVLO are the primary constraints-not the control architecture itself.
TPS54521RHLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-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):
- 4.5V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 5A
- Frequency - Switching:
- 200kHz ~ 900kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VQFN (3.5x3.5)
TPS54521RHLR FAQ
1.How can I place an order for TPS54521RHLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54521RHLR 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 TPS54521RHLR reliable?
The price and inventory of TPS54521RHLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54521RHLR is usually 5 days.
3.What payment methods are accepted for TPS54521RHLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54521RHLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54521RHLR?
TPS54521RHLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54521RHLR 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 TPS54521RHLR?
For technical support, including TPS54521RHLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54521RHLR requirements.
6.How does Aetrix verify that TPS54521RHLR is sourced from the original manufacturer or authorized distributors?
All TPS54521RHLR 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 TPS54521RHLR meets industry standards.
7.What is the process for return or replacement of TPS54521RHLR?
All TPS54521RHLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54521RHLR, 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 TPS54521RHLR part is unused and in its original packaging.
Return procedure for TPS54521RHLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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