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Texas Instruments TPS54550PWP
- Part No.:
- TPS54550PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54550PWP.pdf
- Description:
- IC REG BUCK ADJ 6A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,954
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Product details
Overview
TPS54550PWP from Texas Instruments is a synchronous buck PWM converter with integrated high-side MOSFET and external low-side MOSFET drive capability, delivering up to 6 A continuous (7.5 A peak) output current, adjustable output voltage down to 0.891 V with ±1% accuracy, and programmable switching frequency from 250 kHz to 700 kHz - used in point-of-load regulation for FPGAs and microprocessors.
For engineers reviewing the TPS54550PWP datasheet, TPS54550PWP pinout, TPS54550PWP application, or TPS54550PWP equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world design constraints including 180° synchronization capability, adaptive dead-time control, and thermal shutdown at 165°C.
Technical Context
The TPS54550PWP implements a feed-forward modulator with constant gain of 8 V/V across input voltage range, enabling stable loop response independent of VIN. Its error amplifier provides ≥60 dB open-loop gain and 1.0–2.8 MHz unity-gain bandwidth, supporting wide-bandwidth compensation networks for fast transient response.
It features bidirectional SYNC functionality: when RT is floating or grounded, SYNC operates as a falling-edge output synchronized 180° out of phase with PH; when RT is resistor-set, SYNC becomes a falling-edge input for system-level clock alignment - enabling dual-phase interleaving without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 20 V - supports wide industrial and computing supply rails including 5 V, 12 V, and 19 V adapters. |
| Output Current | 6 A continuous, 7.5 A peak - enables single-chip regulation for mid-power DSPs, ASICs, and SoCs. |
| Reference Accuracy | 0.891 V ±1% at TJ = 25°C - ensures tight output voltage tolerance without external trimming. |
| Switching Frequency | 250 kHz to 700 kHz (adjustable via RT resistor) - balances efficiency, size, and EMI in compact layouts. |
| Thermal Shutdown | 165°C trip point with 7°C hysteresis - protects against sustained overload or poor heatsinking in enclosed systems. |
| Current Limit | 7.5 A to 9.5 A (typ. 8.5 A at VIN = 12 V) - provides robust overcurrent protection with hiccup-mode recovery. |
| Power Good Threshold | 97% of regulated output - ensures reliable system enable sequencing before downstream logic powers up. |
Pinout & Package
TPS54550PWP is housed in a thermally enhanced 16-pin HTSSOP (PWP) package with exposed PowerPAD™ for improved thermal dissipation - requires solder connection of PowerPAD to PGND plane per TI layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Input power supply | 4.5–20 V primary input; must be bypassed with ≥10-μF low-ESR ceramic capacitor near pins. |
| UVLO (Pin 3) | Undervoltage lockout control | External resistor divider overrides default 4.49 V start threshold; prevents startup below safe rail level. |
| PWRGD (Pin 4) | Open-drain power-good indicator | Asserts low if VSENSE falls below 97%, during UVLO, thermal shutdown, or current-limit hiccup. |
| RT (Pin 5) | Frequency programming node | Resistor to AGND sets fSW from 250–700 kHz; floating/grounded selects fixed 500/250 kHz modes. |
| SYNC (Pin 6) | Bidirectional sync I/O | Configurable as falling-edge output (180° out-of-phase with PH) or falling-edge input for multi-phase sync. |
| SSENA (Pin 7) | Enable/slow-start control | Logic-high enables operation; capacitor to ground extends soft-start time to prevent inrush current tripping OCP. |
| COMP (Pin 8) | Error amplifier output | Connects to VSENSE via Type II/III compensation network to stabilize feedback loop dynamics. |
| VSENSE (Pin 9) | Inverting input of error amplifier | Monitors output via resistor divider; internal reference is 0.891 V ±1% - sets output VO = 0.891 × (1 + R1/R2). |
| AGND (Pin 10) | Analog ground reference | Internally connected to sensitive analog circuitry; must tie to PGND and PowerPAD with low-inductance path. |
| PGND (Pin 11) | Power ground return | Carries high di/dt currents from LSG driver; connects directly to PowerPAD and input/output capacitors' ground planes. |
| VBIAS (Pin 12) | Internal bias supply | Provides ~7.8 V (at VIN ≥12 V) for gate drivers; requires 1.0 μF X7R/X5R ceramic bypass capacitor. |
| LSG (Pin 13) | Low-side gate driver output | Drives external N-channel MOSFET gate; 100 mA sink/source capability supports common logic-level FETs. |
| PH (Pins 14,15) | Phase node connection | Connects to output inductor; high dv/dt node requiring short, low-inductance PCB routing to minimize ringing. |
| BOOT (Pin 16) | High-side gate bootstrap | Requires 0.1 μF ceramic capacitor + 24 Ω resistor to PH for proper high-side FET turn-on voltage generation. |
| PowerPAD (Pin 17) | Thermal & electrical ground pad | Exposed copper pad under package; must be soldered to large PGND/AGND copper area for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 40 mΩ high-side MOSFET | Reduces conduction loss at 12 V input, enabling >90% efficiency at 3.3 V/6 A with optimized external FET. |
| 180° out-of-phase synchronization | Enables dual-phase interleaving to halve input ripple current and reduce required bulk capacitance by ~50%. |
| Adaptive dead-time control | Prevents shoot-through by dynamically delaying LSG turn-on until PH voltage drops below 1 V, regardless of FET characteristics. |
| Feed-forward modulator (Km = 8 V/V) | Maintains constant power-stage gain across input voltage range, simplifying loop compensation and improving line transient rejection. |
| Programmable undervoltage lockout | Allows custom start/stop thresholds (e.g., 7.8 V start) using external resistive divider on UVLO pin - critical for battery-powered systems. |
| Hiccup-mode overcurrent protection | Disables switching, resets slow-start, and retries after 4.5 ms (at 500 kHz) - prevents thermal runaway during sustained overload. |
Applications
| Point-of-Load Regulation for FPGAs | Industrial LCD Power Supply |
|---|---|
|
Use Scenario: Regulating 1.2 V core voltage for Xilinx Kintex-7 FPGA with dynamic load steps up to 4 A/μs. IC Role / Device Role / Timing Role: Primary buck controller providing tightly regulated, low-noise core rail with fast transient response. Use Value: Achieves <1% output deviation under 4-A step load due to 2.8-MHz error amplifier bandwidth and feed-forward modulation. |
Use Scenario: Generating 5 V and 12 V rails for backlight and logic in commercial-grade 24-inch LCD monitor. IC Role / Device Role / Timing Role: Dual-rail power manager with SYNC pin enabling interleaved operation between two TPS54550PWP units. Use Value: Reduces RMS input ripple current by 70%, allowing smaller 105°C-rated bulk capacitors and extending lifetime. |
| Computer Peripheral Power | ASIC Power Delivery System |
|
Use Scenario: Supplying 3.3 V/5 A to USB 3.0 hub controller and PCIe switch in embedded PC chassis. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter with PWRGD signaling host processor when rail is stable. Use Value: Ensures reliable enumeration by asserting PWRGD only after VOUT reaches 97% and remains stable for ≥4 ms. |
Use Scenario: Delivering 0.85 V/6 A to 28 nm ASIC with strict <±10 mV output tolerance and <100 ns fault response. IC Role / Device Role / Timing Role: Precision regulator with 0.891 V ±1% reference and thermal shutdown at 165°C. Use Value: Maintains die junction temperature within safe margin under full load via PowerPAD-enhanced thermal resistance (40.1°C/W). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54620RGYR | Fixed 600 kHz fSW, integrated low-side FET, 6 A output, 4.5–17 V input - no external LSG drive needed. | Eliminates external MOSFET but lacks 180° SYNC output and UVLO adjustability - less flexible for multi-phase or battery-input designs. | Select when board space is constrained and external FET cost/complexity must be avoided; not suitable for 18–20 V inputs. |
| LM5116WGX/NOPB | Wide-input (6–100 V), external high- and low-side FETs, 5 A typical, no integrated high-side FET - higher BOM count. | Supports industrial 24/48 V rails and harsh environments; lacks PowerPAD thermal enhancement and PWRGD accuracy. | Choose for >20 V input or high-reliability industrial use; requires additional gate-drive components and layout effort. |
Compared with TPS54550PWP, TPS54620RGYR integrates the low-side FET but sacrifices synchronization flexibility and input voltage headroom, while LM5116WGX/NOPB supports wider VIN but demands more external components and offers looser power-good accuracy - making TPS54550PWP optimal for 5–12 V computing loads requiring precise timing control and thermal performance.
Availability
TPS54550PWP is available at Aetrix Electronics and suitable for point-of-load regulation for FPGAs, industrial LCD monitors, and computer peripherals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TPS54550PWP 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The TPS54550PWP belongs to TI's SWIFT™ synchronous buck controller family, engineered specifically for high-efficiency, medium-current point-of-load applications in computing, communications, and industrial equipment where thermal performance and synchronization capability are critical.
FAQ
What is the maximum input voltage rating for the TPS54550PWP?
The TPS54550PWP has an absolute maximum input voltage rating of 21.5 V on the VIN pin, with recommended operating range from 4.5 V to 20 V. Exceeding 20 V continuously risks violating SOA limits and may trigger thermal shutdown or damage the internal high-side MOSFET. The device's 40 mΩ rDS(ON) and PowerPAD packaging allow reliable operation at 20 V with adequate PCB copper area and airflow.
Can the TPS54550PWP operate without an external low-side MOSFET?
No, the TPS54550PWP requires an external low-side N-channel MOSFET connected to the LSG pin - it does not integrate a low-side switch. The datasheet explicitly states "Uses External Lowside MOSFET" and specifies LSG as a 100 mA gate driver output. Attempting to operate without the external FET will result in no output regulation and potential damage due to uncontrolled PH node behavior.
How does the SYNC pin function in 180° out-of-phase mode with the TPS54550PWP?
When the RT pin is floating or grounded, the TPS54550PWP configures SYNC as a falling-edge output that is precisely 180° out of phase with the rising edge of the PH pin. This allows two TPS54550PWP units to interleave their switching, reducing input ripple current by up to 70% and relaxing bulk capacitor requirements - confirmed in TI's SLVS623A datasheet Figure 4 and Application Information section.
What is the purpose of the PowerPAD on the TPS54550PWP package?
The PowerPAD on the TPS54550PWP is an exposed thermal pad electrically tied to PGND and AGND, designed to conduct heat from the die into the PCB copper plane. With a junction-to-ambient thermal resistance of 40.1°C/W (on standard 2-layer test board), proper soldering of the PowerPAD to a ≥1-in² copper pour is mandatory to maintain junction temperature ≤125°C at 6 A load - omission causes thermal shutdown at reduced current.
Does the TPS54550PWP support adjustable output voltage below 1 V?
Yes, the TPS54550PWP supports output voltages down to 0.891 V with ±1% accuracy at 25°C, as specified in its reference voltage electrical characteristic table. This is achieved via the internal 0.891 V bandgap reference and external resistor divider on VSENSE. Lower outputs are possible but require validation against minimum controllable on-time (180 ns) and input voltage constraints per Figure 8 in the datasheet.
TPS54550PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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):
- 20V
- Voltage - Output (Min/Fixed):
- 0.891V
- Voltage - Output (Max):
- 17.2V
- Current - Output:
- 6A
- Frequency - Switching:
- 250kHz, 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS54550PWP FAQ
1.How can I place an order for TPS54550PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54550PWP 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 TPS54550PWP reliable?
The price and inventory of TPS54550PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54550PWP is usually 5 days.
3.What payment methods are accepted for TPS54550PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54550PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54550PWP?
TPS54550PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54550PWP 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 TPS54550PWP?
For technical support, including TPS54550PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54550PWP requirements.
6.How does Aetrix verify that TPS54550PWP is sourced from the original manufacturer or authorized distributors?
All TPS54550PWP 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 TPS54550PWP meets industry standards.
7.What is the process for return or replacement of TPS54550PWP?
All TPS54550PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54550PWP, 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 TPS54550PWP part is unused and in its original packaging.
Return procedure for TPS54550PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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