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Texas Instruments TPS56221DQPT
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- Part No.:
- TPS56221DQPT
- Manufacturer:
- Texas Instruments
- Package:
- 22-PowerLFDFN
- Datasheet:
-
TPS56221DQPT.pdf
- Description:
- IC REG BUCK ADJ 25A 22LSON-CLIP
- Quantity:
- Payment:
- Shipping:
Inventory:673
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Product details
Overview
TPS56221 from Texas Instruments is a 25-A synchronous buck DC-DC converter with integrated NexFET™ power MOSFETs, operating from 4.5 V to 14 V input and delivering output down to 0.6 V. It features voltage-mode control with feed-forward compensation, programmable soft-start via EN/SS pin, and 1% accurate 600-mV reference for precision POL regulation in telecom baseband cards.
For engineers reviewing the TPS56221 datasheet, TPS56221 pinout, TPS56221 application, or TPS56221 equivalent, key selection criteria include its 22-pin PQFN PowerPAD™ package, 300/500/1000 kHz selectable switching frequency, high-side/low-side RDS(on) sensing (4.5 mΩ / 1.9 mΩ), thermal shutdown at 145°C, and support for prebiased outputs in hot-swap environments.
Technical Context
The TPS56221 implements voltage-mode PWM control with feed-forward compensation, enabling instantaneous response to VIN transients. Its adaptive anti-cross conduction circuitry monitors the SW node to prevent shoot-through, while the calibration cycle at startup measures ILIM pin voltage to set low-side OCP threshold and samples COMP pin impedance to configure switching frequency.
It integrates dual N-channel NexFET™ power stages - high-side RDS(on) = 4.5 mΩ (typ), low-side RDS(on) = 1.9 mΩ (typ) - and embeds a 6-V BP regulator with 1 µF bypass capacitor requirement. The error amplifier features dual noninverting inputs (600-mV reference and level-shifted EN/SS ramp), enabling closed-loop soft-start without open-loop duty cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 14 V - supports 5 V, 12 V intermediate bus rails with UVLO turn-on at 4.3 V ±0.3 V. |
| Output Current | Up to 25 A continuous - enabled by thermally enhanced 5 mm × 6 mm PQFN PowerPAD™ package with RθJA = 34.6°C/W. |
| Reference Voltage | 600 mV ±1% - ensures ±12 mV absolute output tolerance at FB node for tight regulation of sub-1 V cores. |
| Switching Frequency | 300 / 500 / 1000 kHz - user-selectable via resistor on COMP pin; enables trade-off between efficiency (lower fSW) and size (higher fSW). |
| OCP Threshold | Programmable 12–100 mV across low-side FET - sets current limit from ~6 A to ~50 A using single ILIM-to-GND resistor. |
| Soft-Start Control | 10 µA internal current source on EN/SS - allows precise ramp time tuning (e.g., 10 ms with 167 nF capacitor) without external components. |
| Thermal Protection | 145°C shutdown with 20°C hysteresis - prevents latch-up during sustained overload or poor PCB heatsinking. |
Pinout & Package
TPS56221 is housed in a thermally optimized 22-pin LSON-CLIP (DQP) PQFN package measuring 5.00 mm × 6.00 mm, featuring an exposed thermal pad electrically connected to GND for low-impedance heat transfer to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | High-side gate driver supply | Requires 100-nF ceramic capacitor to SW; series 5–10 Ω resistor slows high-side turn-on to suppress ringing. |
| SW | Power switching node | Common connection point for high-side drain, low-side source, and bootstrap capacitor return; subject to fast dV/dt transitions. |
| ILIM | OCP threshold programming | 10 µA current source sets low-side overcurrent trip point; voltage ×2 determines actual FET RDS(on)-based current limit. |
| EN/SS | Enable + soft-start control | Logic-level enable (VIH ≥ 0.55 V); capacitor to GND programs soft-start time; internal 10 µA source charges it linearly. |
| FB | Feedback input | Inverting input to error amplifier; regulated to 600 mV ±1%; connects to resistor divider from VOUT for output setting. |
| COMP | Error amplifier output | Connects to loop compensation network; resistor to GND selects switching frequency (40.2 kΩ → 300 kHz, 13.3 kΩ → 1 MHz). |
| PGD | Open-drain power-good flag | Asserts when FB is within 500–700 mV window; requires external pull-up; provides system sequencing feedback. |
| VIN | High-side FET input | Six parallel pins (12–17) reduce trace inductance and IR drop; must be routed with low-inductance path to bulk capacitor. |
| GND | Signal & power ground | Pins 3 and thermal pad (pin 5) serve as combined electrical reference and thermal conduction path to PCB ground plane. |
| BP | Internal regulator bypass | Supplies 6.5 V ±0.3 V to controller logic; requires ≥1 µF low-ESR ceramic capacitor to GND for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NexFET™ power stage | Eliminates external MOSFET selection and layout complexity; achieves 4.5 mΩ/1.9 mΩ RDS(on) in compact 5×6 mm footprint. |
| Voltage feed-forward compensation | Directly scales PWM ramp with VIN, maintaining constant loop gain across input range and improving line transient response. |
| Prebias output support | Enables safe startup into already-biased loads (e.g., FPGA I/O banks) without reverse current or output overshoot. |
| Programmable overcurrent protection | Single ILIM resistor configures low-side valley-current OCP from 6 A to 50 A; high-side pulse-by-pulse limiting fixed at 54 A. |
| Thermally enhanced PowerPAD™ | Exposed copper pad reduces junction-to-board thermal resistance to 0.3°C/W, enabling 25 A operation with minimal heatsink. |
Applications
| Telecom Point-of-Load | Networking ASIC Core Supply |
|---|---|
Use Scenario: Regulating 0.85 V @ 20 A for 5G baseband processor core on dense 4-layer FR4 board. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with integrated power FETs and feed-forward control for fast line/load transients. Use Value: Delivers 92% peak efficiency at 12 V input, 0.85 V/20 A output; thermal pad anchors to inner ground layer for <15°C rise at full load. |
Use Scenario: Powering 1.2 V I/O bank of multi-gigabit Ethernet switch ASIC with hot-swap capability. IC Role / Device Role / Timing Role: Prebias-capable POL converter with hiccup-mode OCP for fault containment during live insertion. Use Value: Supports precharged output without reverse current; PGD signal synchronizes with FPGA configuration sequence. |
| Industrial PLC CPU Module | High-Density DC-DC Module |
Use Scenario: Generating 3.3 V @ 15 A for ARM-based PLC controller in convection-cooled enclosure. IC Role / Device Role / Timing Role: High-current buck controller with thermal shutdown and programmable soft-start for reliable cold-boot. Use Value: 145°C thermal shutdown protects against fan failure; 10 µA EN/SS current enables precise 50-ms soft-start timing. |
Use Scenario: Embedded in 1/4-brick DC-DC module targeting 100 W/in³ density for datacenter power shelves. IC Role / Device Role / Timing Role: Core power conversion IC with 1 MHz option to minimize inductor size and improve transient response. Use Value: 1 MHz operation reduces output inductor volume by ~60% vs. 500 kHz; PQFN package enables double-sided component placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-Z (Monolithic Power) | 4.5–18 V input, 20 A max, 500 kHz fixed fSW, no programmable OCP or feed-forward. | Lacks prebias support and ILIM-programmable OCP; simpler design but less flexible for telecom POL. | Choose for cost-sensitive industrial supplies where 20 A and fixed frequency suffice. |
| ISL8225MIRZ (Renesas) | 4.5–14 V input, 25 A, 300–1000 kHz selectable, but uses external MOSFETs and larger 15 mm × 15 mm module footprint. | Requires discrete power stage layout; higher thermal resistance limits ambient temperature derating. | Choose when board-level thermal management is constrained and discrete FET optimization is required. |
Compared with MP8770GQ-Z and ISL8225MIRZ, the TPS56221 uniquely combines integrated NexFET™ power stages, feed-forward compensation, prebias capability, and ILIM-programmable OCP in a compact 5×6 mm PQFN - making it optimal for space-constrained, high-reliability telecom and networking POL designs.
Availability
TPS56221 is available at Aetrix Electronics and suitable for telecom baseband cards, networking ASIC core supplies, industrial PLC CPU modules, and high-density DC-DC modules requiring stable component supply and long-term production continuity.
Supply support for TPS56221 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-efficiency DC-DC conversion.
The TPS56221 belongs to TI's SWIFT™ synchronous buck converter family, engineered for high-current, high-density point-of-load applications in telecom infrastructure, enterprise networking, and industrial automation systems.
FAQ
What is the maximum output current supported by the TPS56221?
The TPS56221 supports up to 25 A continuous output current under recommended thermal conditions (TJ ≤ 125°C). This rating assumes proper PCB layout with the thermal pad soldered to a large copper ground plane and adequate airflow or convection cooling. At 12 V input and 0.8 V output, peak efficiency exceeds 92%, and thermal resistance (RθJA) is specified at 34.6°C/W in the 5 mm × 6 mm PQFN package.
How do I configure the switching frequency of the TPS56221?
The TPS56221 switching frequency is configured by connecting a resistor from the COMP pin to GND: 40.2 kΩ sets 300 kHz, no resistor defaults to 500 kHz, and 13.3 kΩ sets 1 MHz. These values assume ±10% tolerance resistors. The device performs automatic impedance sensing during startup calibration, so no additional configuration registers or commands are needed - the resistor value directly determines oscillator frequency.
Does the TPS56221 support prebiased output startup?
Yes, the TPS56221 explicitly supports prebiased output startup. Its control architecture prevents reverse current flow during startup into an already-powered rail by actively regulating the high-side FET gate drive and monitoring the SW node polarity. This feature is confirmed in the datasheet's Feature list and Detailed Description section 7.1, and is critical for hot-swap applications like modular telecom line cards.
What is the purpose of the ILIM pin on the TPS56221?
The ILIM pin on the TPS56221 programs the overcurrent protection threshold for the low-side FET. A resistor from ILIM to GND sets a voltage that - when multiplied by 2 internally - defines the voltage drop across the low-side RDS(on) at which OCP triggers. This enables precise current limiting from ~6 A to ~50 A without external sense resistors, leveraging the MOSFET's intrinsic on-resistance for lossless current sensing.
Can the TPS56221 operate with an input voltage lower than 4.5 V?
No, the TPS56221 has a minimum recommended input voltage of 4.5 V per its Absolute Maximum Ratings and Recommended Operating Conditions tables. Below this, the internal BP regulator cannot sustain stable 6.5 V output, and the high-side gate driver lacks sufficient bootstrap voltage margin. Attempting operation below 4.5 V may result in erratic switching, reduced current capability, or failure to start - the UVLO circuit disables the device below ~4.0 V nominal.
TPS56221DQPT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 4.5V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 13.02V
- Current - Output:
- 25A
- Frequency - Switching:
- 300kHz, 500kHz, 950kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-LSON-CLIP (6x5)
TPS56221DQPT FAQ
1.How can I place an order for TPS56221DQPT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS56221DQPT 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 TPS56221DQPT reliable?
The price and inventory of TPS56221DQPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS56221DQPT is usually 5 days.
3.What payment methods are accepted for TPS56221DQPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS56221DQPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS56221DQPT?
TPS56221DQPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS56221DQPT 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 TPS56221DQPT?
For technical support, including TPS56221DQPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS56221DQPT requirements.
6.How does Aetrix verify that TPS56221DQPT is sourced from the original manufacturer or authorized distributors?
All TPS56221DQPT 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 TPS56221DQPT meets industry standards.
7.What is the process for return or replacement of TPS56221DQPT?
All TPS56221DQPT units undergo pre-shipment inspection (PSI). If there is an issue with TPS56221DQPT, 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 TPS56221DQPT part is unused and in its original packaging.
Return procedure for TPS56221DQPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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