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Texas Instruments TPS54550PWPRG4
- Part No.:
- TPS54550PWPRG4
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54550PWPRG4.pdf
- Description:
- IC REG BUCK ADJ 6A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS54550PWPRG4 from Texas Instruments is a synchronous buck PWM switcher IC with integrated high-side MOSFET and external low-side FET drive, delivering up to 6 A continuous output current (7.5 A peak), adjustable output voltage down to 0.891 V with ±1% accuracy, and programmable switching frequency from 250 kHz to 700 kHz. It is used in point-of-load regulation for FPGAs, DSPs, and microprocessors requiring tight transient response and thermal robustness.
For engineers reviewing the TPS54550PWPRG4 datasheet, TPS54550PWPRG4 pinout, TPS54550PWPRG4 application, or TPS54550PWPRG4 equivalent, key selection considerations include its 4.5–20 V input range, 16-pin HTSSOP PowerPAD™ package with exposed thermal pad, adaptive dead-time control, and bidirectional SYNC capability for 180° out-of-phase paralleling.
Technical Context
The TPS54550PWPRG4 implements a feed-forward modulator architecture with constant gain (Km = 8 V/V) that scales the PWM ramp inversely with input voltage to maintain stable loop dynamics across wide VIN ranges. Its error amplifier provides ≥60 dB open-loop gain and 1–2.8 MHz unity-gain bandwidth, enabling fast transient recovery with standard Type II/III compensation networks connected between COMP and VSENSE.
Control logic integrates adaptive dead-time generation to prevent shoot-through by sequencing LSG turn-on only after PH node voltage falls below 1 V, and high-side turn-on only after LSG gate voltage drops below 1 V. The device supports both internal oscillator operation (250/500 kHz fixed) and external synchronization via falling-edge-triggered SYNC I/O, configurable per RT pin state.
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. |
| Continuous Output Current | 6 A - Sustained load capability verified under thermal limits with proper PCB layout and airflow. |
| Output Voltage Accuracy | ±1% at 0.891 V - Tight reference tolerance enables precise core voltage regulation for modern processors. |
| Switching Frequency Range | 250 kHz to 700 kHz - Adjustable via RT resistor; higher frequencies reduce inductor size but increase switching loss. |
| High-Side rDS(on) | 40 mΩ at VIN = 12 V - Low conduction loss improves efficiency at medium-to-high loads. |
| Thermal Shutdown Threshold | 165°C with 7°C hysteresis - Protects against sustained overload or inadequate heatsinking. |
| Power Good Threshold | 97% of set VOUT - Ensures reliable system power sequencing before host processor release. |
Pinout & Package
TPS54550PWPRG4 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad (Pin 17), requiring solder connection to PGND/AGND plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Input supply rail | Bypassed with ≥10 μF ceramic capacitor; feeds high-side FET and bias regulator. |
| UVLO (Pin 3) | Undervoltage lockout adjust | External resistor divider overrides default 4.49 V start threshold for custom brown-out behavior. |
| PWRGD (Pin 4) | Open-drain power status | Asserts low if VOUT < 97%, overcurrent, thermal fault, or during slow-start - requires external pull-up. |
| RT (Pin 5) | Oscillator frequency set | Resistor to AGND programs 250–700 kHz; floating/grounded selects 500/250 kHz fixed modes. |
| SYNC (Pin 6) | Bidirectional sync I/O | Outputs falling edge 180° out-of-phase with PH when RT floating; accepts falling-edge sync input when RT resistor present. |
| SSENA (Pin 7) | Enable/slow-start control | Pulled low (<0.5 V) disables switching; capacitor to ground extends soft-start time linearly with capacitance value. |
| COMP (Pin 8) | Error amplifier output | Connects to VSENSE via external compensation network (e.g., RC + capacitor) to stabilize control loop. |
| VSENSE (Pin 9) | Feedback sense input | Inverting input of error amp; connected to resistor divider from VOUT to set regulated output voltage. |
| AGND (Pin 10) | Analog ground reference | Internally connects sensitive analog circuitry; must be tied to PGND and PowerPAD™ for noise immunity. |
| PGND (Pin 11) | Power ground return | Carries high di/dt currents from LSG driver; low-impedance connection to PowerPAD™ essential for EMI control. |
| VBIAS (Pin 12) | Internal 8 V bias supply | Provides gate drive and analog bias; requires 1 μF X7R/X5R ceramic bypass capacitor. |
| LSG (Pin 13) | Low-side gate driver output | Drives external N-channel MOSFET gate directly; 100 mA sink/source capability supports common logic-level FETs. |
| PH (Pins 14,15) | Phase node connection | Connects to LC filter input; carries full switching current and high dv/dt - requires short, low-inductance routing. |
| BOOT (Pin 16) | High-side gate bootstrap | Requires 0.1 μF ceramic capacitor + 24 Ω resistor to PH for high-side FET gate charging. |
| PowerPAD™ (Pin 17) | Thermal & ground interface | Exposed copper pad; must be soldered to large PGND/AGND copper area for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 40 mΩ rDS(on) at 12 V enables >90% efficiency at 5 VIN/3.3 VOUT, 6 A without external high-side component. |
| Adjustable output voltage | Down to 0.891 V with ±1% reference accuracy supports low-voltage cores (e.g., ARM Cortex-A series, Xilinx Zynq). |
| 180° out-of-phase synchronization | Reduces RMS input ripple current by ~30% when two units are interleaved, lowering required bulk capacitance. |
| Adaptive dead-time control | Prevents shoot-through by dynamically sensing PH node voltage, eliminating need for fixed dead-time tuning. |
| Thermal shutdown with hysteresis | 165°C trip + 7°C hysteresis ensures safe restart after cooling, avoiding thermal cycling damage during overload. |
Applications
| Point-of-Load Regulation for FPGAs | LCD Monitor Power Supply |
|---|---|
Use Scenario: Regulating 1.2 V core voltage for Xilinx Artix-7 FPGA with dynamic current demand up to 5 A. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing transient response, voltage accuracy, and thermal margin. Use Value: 6 A continuous rating and 1% reference accuracy ensure stable operation during logic reconfiguration bursts without brownout. | Use Scenario: Generating 5 V and 12 V rails for LCD panel backlight drivers and timing controllers in commercial monitors. IC Role / Device Role / Timing Role: Secondary DC-DC converter providing isolated, efficient mid-rail outputs from main 19 V adapter. Use Value: Wide 4.5–20 V input range accommodates adapter tolerances; SYNC capability allows interleaving with primary converter to reduce EMI. |
| Industrial PLC I/O Module | Computer Peripheral Power |
Use Scenario: Powering isolated CAN transceivers and analog sensor interfaces in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Robust local regulator handling 48 V-derived 12 V intermediate bus with surge and thermal stress. Use Value: UVLO adjustment (via Pin 3) sets custom 10 V startup threshold to avoid false triggering during brownout events on factory floor mains. | Use Scenario: Supplying 3.3 V to USB 3.0 hub controllers and PCIe switch logic in docking stations and expansion enclosures. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 5 V or 12 V system bus. Use Value: 700 kHz max switching frequency allows compact 2.2 μH inductors; PWRGD signal coordinates USB enumeration timing with host controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54560PWPR | Same 4.5–60 V input range, 6 A output, but includes integrated low-side FET; no external LSG drive needed. | Better suited for space-constrained designs where external MOSFET layout is impractical; lacks 180° SYNC capability. | Select TPS54560PWPR if board area is critical and input voltage exceeds 20 V; otherwise retain TPS54550PWPRG4 for flexibility with optimized external FETs. |
| LM5116WGX/NOPB | Wide-input (6–100 V), 6 A controller with integrated high- and low-side drivers; supports forced CCM and valley current mode. | Designed for high-VIN industrial/motor drives; lacks adjustable UVLO and PWRGD accuracy spec; different compensation topology. | Choose LM5116WGX/NOPB for >20 V inputs or harsh environments; TPS54550PWPRG4 remains preferred for ≤20 V computing/communications loads with precision sequencing needs. |
Compared with TPS54560PWPR and LM5116WGX/NOPB, the TPS54550PWPRG4 offers superior output voltage accuracy (±1% vs ±2%), dedicated SYNC I/O for interleaving, and finer UVLO customization - making it optimal for tightly regulated, multi-rail digital systems where layout control and timing coordination are critical.
Availability
TPS54550PWPRG4 is available at Aetrix Electronics and suitable for point-of-load regulation, FPGA core supplies, and industrial PLC power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS54550PWPRG4 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-reliability power conversion ICs.
The TPS54550PWPRG4 belongs to TI's SWIFT™ synchronous buck controller family, designed specifically for high-efficiency, medium-current point-of-load applications in computing, communications, and industrial equipment where thermal performance and transient response are critical.
FAQ
What is the maximum output current capability of the TPS54550PWPRG4?
The TPS54550PWPRG4 delivers up to 6 A continuous output current and supports 7.5 A peak current under transient conditions. This rating assumes proper thermal design using the PowerPAD™ package with adequate PCB copper area and airflow. Derating applies above +85°C ambient per the thermal impedance curves in the datasheet.
Does the TPS54550PWPRG4 require an external low-side MOSFET?
Yes, the TPS54550PWPRG4 requires an external low-side N-channel MOSFET driven by the LSG pin. Unlike fully integrated converters, it uses an external FET to optimize efficiency and thermal distribution for specific load conditions. The LSG driver provides 100 mA sink/source capability compatible with most logic-level MOSFETs.
How is the switching frequency configured on the TPS54550PWPRG4?
The TPS54550PWPRG4 switching frequency is set via the RT pin: grounding RT selects 250 kHz, floating RT selects 500 kHz, and connecting a resistor (69–215 kΩ) from RT to AGND programs 250–700 kHz. The internal oscillator scales ramp current linearly to maintain constant modulator gain across all frequencies.
What is the purpose of the PowerPAD™ on the TPS54550PWPRG4 package?
The PowerPAD™ on the TPS54550PWPRG4 is an exposed thermal pad that must be soldered to a large PGND/AGND copper plane. It serves dual functions: reducing junction-to-ambient thermal resistance (40.1°C/W typical) and providing low-inductance grounding for high-frequency switching currents, which improves EMI performance and stability.
Can the TPS54550PWPRG4 synchronize with other converters for interleaved operation?
Yes, the TPS54550PWPRG4 supports bidirectional synchronization: when RT is floating or grounded, SYNC acts as an output generating a falling edge 180° out-of-phase with PH; when RT is resistor-programmed, SYNC becomes a falling-edge input. This enables precise interleaving to reduce input ripple and improve thermal balance across multiple phases.
TPS54550PWPRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
TPS54550PWPRG4 FAQ
1.How can I place an order for TPS54550PWPRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54550PWPRG4 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 TPS54550PWPRG4 reliable?
The price and inventory of TPS54550PWPRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54550PWPRG4 is usually 5 days.
3.What payment methods are accepted for TPS54550PWPRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54550PWPRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54550PWPRG4?
TPS54550PWPRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54550PWPRG4 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 TPS54550PWPRG4?
For technical support, including TPS54550PWPRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54550PWPRG4 requirements.
6.How does Aetrix verify that TPS54550PWPRG4 is sourced from the original manufacturer or authorized distributors?
All TPS54550PWPRG4 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 TPS54550PWPRG4 meets industry standards.
7.What is the process for return or replacement of TPS54550PWPRG4?
All TPS54550PWPRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54550PWPRG4, 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 TPS54550PWPRG4 part is unused and in its original packaging.
Return procedure for TPS54550PWPRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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