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Texas Instruments TPS54326RGTT
- Part No.:
- TPS54326RGTT
- Manufacturer:
- Texas Instruments
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
TPS54326RGTT.pdf
- Description:
- IC REG BUCK ADJ 3A 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,481
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Product details
Overview
TPS54326RGTT from Texas Instruments is a 3-A synchronous step-down DC/DC converter with integrated high-side (120 mΩ) and low-side (70 mΩ) N-channel MOSFETs, D-CAP2™ adaptive on-time control, and Auto-Skip Eco-mode™ for light-load efficiency. It operates from 4.5 V to 18 V VCC and 2 V to 18 V VIN, delivers 0.76 V to 5.5 V output, and targets digital TV, Blu-ray player, and STB power rails.
For engineers reviewing the TPS54326RGTT datasheet, TPS54326RGTT pinout, TPS54326RGTT application, or TPS54326RGTT equivalent, this device supports fast transient response without external compensation, enables ceramic-capacitor-based designs, and provides power-good signaling, pre-biased soft-start, and cycle-by-cycle overcurrent protection in a thermally enhanced 16-pin QFN package.
Technical Context
The TPS54326RGTT implements D-CAP2™ mode control using adaptive on-time PWM, where on-time is inversely proportional to input voltage and proportional to output voltage-yielding pseudo-constant 700 kHz switching frequency. Its internal ramp compensates for zero-ripple conditions, enabling stability with ultra-low-ESR ceramic output capacitors.
Auto-Skip Eco-mode™ transitions seamlessly between PWM and discontinuous conduction mode below ~300 mA load, reducing switching losses. Protection includes cycle-by-cycle valley-current limiting (4.1 A typ), output OVP/UVP (±15% thresholds), thermal shutdown at 150°C, and VREG5 UVLO at 3.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3 A continuous - supports mid-power system rails without external FETs or heatsinks |
| Input voltage range | 4.5–18 V (VCC), 2–18 V (VIN) - accommodates wide-input industrial and consumer supplies |
| Output voltage range | 0.76–5.5 V - programmable via resistor divider for core, I/O, or peripheral rail generation |
| Switching frequency | ~700 kHz (pseudo-fixed) - balances EMI, size, and efficiency for compact 1–2 cm² layouts |
| FET RDS(on) | 120 mΩ (HS), 70 mΩ (LS) - enables >90% peak efficiency at 12 VIN/3.3 VOUT |
| Control mode | D-CAP2™ adaptive on-time - eliminates loop compensation components and supports ceramic-only output |
| Light-load efficiency | Auto-Skip Eco-mode™ - maintains >80% efficiency down to 10 mA output current |
| Soft-start | Adjustable via external capacitor - prevents inrush current; supports pre-biased output startup |
Pinout & Package
TPS54326RGTT uses a 16-pin plastic QFN package (3 mm × 3 mm, 0.5 mm pitch) with an exposed thermal pad soldered to PGND for enhanced thermal dissipation (θJA = 46.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 16) | Output voltage node | Power output terminal; connects to LC filter and feedback divider; used for on-time adjustment |
| VFB (Pin 1) | Feedback input | Sense point for output regulation; accepts resistor divider to set 0.765 V reference |
| VREG5 (Pin 2) | Internal 5.5 V LDO output | Powers internal circuitry; requires 1 µF ceramic bypass to PGND |
| SS (Pin 3) | Soft-start control | Connects to external capacitor for adjustable ramp-up time and pre-biased startup control |
| GND (Pin 4) | Signal ground | Analog reference for control logic; must be star-connected to PGND near IC |
| PG (Pin 5) | Open-drain power-good | Asserts high after 1.7× soft-start when VOUT is within ±10%; requires pull-up to VREG5 |
| EN (Pin 6) | Enable input | Active-high logic control; 1.5 V threshold enables precise sequencing and standby management |
| PGND1/PGND2 (Pins 7,8) | Power ground returns | Low-side FET source connections and current-sense inputs; must be tied directly to thermal pad |
| SW1/SW2 (Pins 9,10,11) | Switch nodes | High-side drain / low-side source junctions; connect to inductor; require tight layout to minimize ringing |
| VBST (Pin 12) | Bootstrap supply | Drives high-side gate; requires 0.1 µF ceramic cap to SW1/SW2 for charge replenishment |
| VIN (Pins 13,14) | Main power input | Connects to input bulk capacitor; high-current path shared with high-side FET drain |
| VCC (Pin 15) | Control supply input | Accepts 4.5–18 V; powers internal bias circuits and gate drivers independently of VIN |
| Exposed Pad | Thermal & electrical ground | Mandatory solder connection to PGND plane; primary heat path; improves θJA by >10°C/W |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables stable regulation with zero-ESR ceramic capacitors and eliminates external compensation network |
| Auto-Skip Eco-mode™ | Reduces quiescent current to <10 µA in shutdown and sustains >80% efficiency at 10 mA load |
| Pre-biased soft-start | Prevents reverse current flow during startup when output is already biased; avoids system reset |
| Integrated 5.5 V VREG5 LDO | Provides regulated supply for internal logic and external bias; delivers up to 70 mA with ±20 mV line/load regulation |
| Cycle-by-cycle overcurrent protection | Detects valley current on low-side FET; non-latching trip at 4.1 A typical; protects against short-circuit and overload |
| Power-good output with delay | Asserts after 1.7× soft-start time; monitors VFB with ±10% window and 10 ms fault deassertion delay |
Applications
| Digital TV Power Supply | Blu-ray Disc Player |
|---|---|
|
Use Scenario: Powers SoC core, memory, and video processing rails in 4K UHD television platforms. IC Role / Device Role / Timing Role: Primary 3.3 V/1.2 V buck regulator delivering up to 3 A per rail with fast transient response to dynamic video workloads. Use Value: D-CAP2™ control reduces output capacitance by 40% vs. traditional PWM, shrinking BOM and PCB area while maintaining <15 mV ripple under 2 A step load. |
Use Scenario: Supplies regulated voltages to laser diode driver, servo motor controller, and HDMI interface in optical disc players. IC Role / Device Role / Timing Role: Secondary buck converter generating 1.8 V and 2.5 V rails from 12 V intermediate bus with tight load regulation. Use Value: Pre-biased soft-start prevents brownout during hot-plug insertion of optical modules; Eco-mode extends standby battery life in portable variants. |
| Home Networking Terminal | Digital Set Top Box (STB) |
|
Use Scenario: Provides clean, low-noise 1.05 V CPU core voltage and 1.8 V DDR interface supply in DOCSIS 3.1 cable modems. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator operating at 700 kHz to avoid interference with upstream RF bands. Use Value: 120 mΩ/70 mΩ integrated FETs achieve 92% peak efficiency at 12 VIN/1.05 VOUT, reducing thermal load in fanless enclosures. |
Use Scenario: Generates 3.3 V I/O, 1.2 V processor, and 1.5 V memory rails in satellite/cable STBs with multi-core SoCs. IC Role / Device Role / Timing Role: Synchronous buck converter supporting dynamic voltage scaling and deep-sleep modes. Use Value: Adjustable soft-start and power-good signaling enable precise power sequencing across three independent rails without external supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54327RGTR | Same 16-pin QFN package, identical pinout, but adds VIN UVLO hysteresis and improved light-load efficiency (85% at 10 mA) | Preferred for new designs requiring tighter input monitoring and extended battery runtime in portable STBs | Select TPS54327RGTR if UVLO hysteresis (>200 mV) and sub-5 µA shutdown current are required; otherwise TPS54326RGTT remains cost-optimized |
| MP2332HGRT-P | Monolithic 3 A buck in 3 mm × 3 mm QFN, but uses constant-on-time control (not D-CAP2™); 110 mΩ/75 mΩ FETs; no VREG5 LDO | Requires external 5 V bias and separate soft-start timing; suitable for space-constrained designs where integrated LDO is unnecessary | Choose MP2332HGRT-P only when board area is critical and external bias is available; TPS54326RGTT offers superior ease-of-use with integrated VREG5 and pre-biased start |
Compared with TPS54326RGTT, TPS54327RGTR improves input supervision and light-load performance at minor cost premium, while MP2332HGRT-P trades integration for footprint reduction-making TPS54326RGTT the optimal balance of feature completeness, thermal performance, and design simplicity for mainstream consumer power rails.
Availability
TPS54326RGTT is available at Aetrix Electronics and suitable for digital TV, Blu-ray player, and STB power supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for volume production.
Supply support for TPS54326RGTT 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 solutions, with decades of expertise in high-reliability DC/DC conversion.
The TPS54326RGTT belongs to TI's D-CAP2™ synchronous buck converter family, designed specifically for cost-sensitive, high-efficiency consumer electronics power rails where small solution size, fast transient response, and ceramic-capacitor compatibility are essential.
FAQ
What is the maximum output current capability of the TPS54326RGTT?
The TPS54326RGTT delivers up to 3 A continuous output current under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design). Its integrated 120 mΩ high-side and 70 mΩ low-side MOSFETs enable this rating without external components. Peak current limit is specified at 4.1 A typical, providing margin for transient loads. Derating is required above 85°C ambient or with insufficient copper area on the thermal pad.
Does the TPS54326RGTT support pre-biased output startup?
Yes, the TPS54326RGTT includes proprietary pre-biased soft-start circuitry. When the output voltage is already present at startup, the controller gradually enables synchronous rectification-starting with narrow low-side gate pulses and incrementally increasing duty cycle-preventing reverse current flow and ensuring smooth ramp-up into regulation. This avoids system resets in hot-plug or multi-rail sequencing scenarios.
What is the purpose of the VREG5 pin on the TPS54326RGTT?
The VREG5 pin on the TPS54326RGTT is an internally regulated 5.5 V output that powers the IC's control circuitry and can also supply external bias for level-shifters or supervisors. It delivers up to 70 mA with ±20 mV line and load regulation. A mandatory 1 µF ceramic capacitor must be placed between VREG5 and PGND to ensure stability and noise immunity-this LDO eliminates the need for an external bias rail.
How does the D-CAP2™ control mode improve design simplicity for the TPS54326RGTT?
D-CAP2™ control in the TPS54326RGTT eliminates the need for external loop compensation components (e.g., type-II or type-III networks) by embedding adaptive on-time modulation and internal ramp compensation. This allows stable operation with ultra-low-ESR ceramic output capacitors alone-reducing component count, PCB area, and design iteration time. The result is a complete 3 A buck solution with only 6 external components: input/output caps, inductor, feedback resistors, and bootstrap cap.
Can the TPS54326RGTT operate with an input voltage lower than 4.5 V?
Yes-the TPS54326RGTT supports a wide VIN input range of 2 V to 18 V, but its VCC supply (used for control logic and gate drivers) requires 4.5 V to 18 V. When VIN is below 4.5 V, VCC must be supplied externally (e.g., from a separate bias rail or LDO) to maintain operation. This dual-input architecture enables use in battery-powered systems where main rail drops below 4.5 V while control supply remains active.
TPS54326RGTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- 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):
- 5.5V
- Current - Output:
- 3A
- 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)
TPS54326RGTT FAQ
1.How can I place an order for TPS54326RGTT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54326RGTT 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 TPS54326RGTT reliable?
The price and inventory of TPS54326RGTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54326RGTT is usually 5 days.
3.What payment methods are accepted for TPS54326RGTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54326RGTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54326RGTT?
TPS54326RGTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54326RGTT 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 TPS54326RGTT?
For technical support, including TPS54326RGTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54326RGTT requirements.
6.How does Aetrix verify that TPS54326RGTT is sourced from the original manufacturer or authorized distributors?
All TPS54326RGTT 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 TPS54326RGTT meets industry standards.
7.What is the process for return or replacement of TPS54326RGTT?
All TPS54326RGTT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54326RGTT, 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 TPS54326RGTT part is unused and in its original packaging.
Return procedure for TPS54326RGTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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