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Texas Instruments TPS54325PWPR
- Part No.:
- TPS54325PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54325PWPR.pdf
- Description:
- IC REG BUCK ADJ 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:18,322
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Product details
Overview
TPS54325PWPR 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, 700-kHz switching frequency, and operation from 4.5-V to 18-V VCC input. It delivers regulated output voltages from 0.76 V to 5.5 V and is used in digital TV power supplies and networking home terminals.
For engineers reviewing the TPS54325PWPR datasheet, TPS54325PWPR pinout, TPS54325PWPR application, or TPS54325PWPR equivalent, key selection considerations include its D-CAP2™ transient response, pre-biased soft-start capability, cycle-by-cycle overcurrent protection, power-good output, and HTSSOP-14 thermal pad layout requirements.
Technical Context
The TPS54325PWPR implements D-CAP2™ mode control using an adaptive on-time PWM architecture that eliminates external compensation components and enables stable operation with ceramic output capacitors. Its internal one-shot timer sets on-time based on VIN and VO to maintain pseudo-constant 700-kHz frequency.
It integrates dual N-FETs with matched gate drive timing, supports pre-biased startup via controlled low-side FET activation, and includes independent UVLO (3.7 V), OVP (120% VO), UVP (70% VO), and thermal shutdown (150°C) protections - all non-latching and fully autonomous.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 18 V (VCC supply); supports down to 2.0 V VIN with reduced functionality |
| Output Current | 3 A continuous; current limit threshold 3.5–5.5 A (–40°C to 85°C) |
| Output Voltage | 0.76 V to 5.5 V, set by external resistor divider; 0.765-V reference accuracy ±1.5% |
| Switching Frequency | ~700 kHz (pseudo-fixed, adaptive on-time; varies <±10% with VIN/VO) |
| FET RDS(on) | 120 mΩ (high-side), 70 mΩ (low-side) at 25°C - optimized for high-efficiency, low-duty-cycle operation |
| Shutdown Current | <10 μA - enables ultra-low-power system standby states |
| Soft-Start | Adjustable via external capacitor; 2.0-μA charge current enables precise ramp control and pre-biased startup |
Pinout & Package
TPS54325PWPR is housed in a thermally enhanced 14-pin HTSSOP (PWP) package (5.00 mm × 4.40 mm) with exposed PowerPAD™ thermal pad soldered to PGND for efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO (Pin 1) | Output voltage sense node | Connects directly to converter output; used for on-time adjustment and feedback path integrity |
| VFB (Pin 2) | Feedback input | High-impedance input (±0.1 μA) for resistor-divider monitoring of regulated output voltage |
| VREG5 (Pin 3) | Internal 5.5-V LDO output | Powers internal circuitry; requires 1-μF ceramic capacitor to GND for stability |
| SS (Pin 4) | Soft-start control | Accepts external capacitor to GND; 2.0-μA internal current sets ramp time and enables pre-biased startup |
| GND (Pin 5) | Signal ground reference | Reference for control logic; must be tightly coupled to PGND near IC |
| PG (Pin 6) | Open-drain power-good indicator | Asserts high when VO is within ±10% of target after soft-start; requires external pull-up to VREG5 (20–150 kΩ) |
| EN (Pin 7) | Enable input | Active-high logic (1.6 V threshold); disables switching and reduces ICC to <10 μA when low |
| PGND1, PGND2 (Pins 8,9) | Power ground returns | Low-side FET source connections and current-sense comparator inputs; must be joined to GND near IC |
| SW1, SW2 (Pins 10,11) | Switch node outputs | Drain-source connection points between internal FETs; connect to external inductor and bootstrap capacitor |
| VBST (Pin 12) | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1-μF ceramic cap to SW1/SW2 for high-side gate drive |
| VIN (Pin 13) | Main power input | Connects to high-side FET drain; accepts 2.0–18 V input; UVLO triggers at ~3.7 V |
| VCC (Pin 14) | Control supply input | Supplies 5-V regulator core; requires 4.5–18 V; powers internal logic and gate drivers |
| PowerPAD™ | Thermal pad | Exposed copper pad under package; must be soldered to PGND plane for thermal performance and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables zero-external-compensation design, fast load-transient response (<10 μs recovery), and stable operation with ceramic or polymer output capacitors |
| Pre-biased soft-start | Prevents reverse current flow during startup into pre-charged outputs by incrementally enabling low-side FET conduction |
| Integrated dual N-FETs | 120 mΩ high-side + 70 mΩ low-side RDS(on) reduce conduction loss and eliminate external MOSFET selection and layout complexity |
| Output discharge function | Activates internal 50-Ω MOSFET between VO and PGND when disabled or faulted - safely discharges output without sinking through low-side FET |
| Cycle-by-cycle overcurrent protection | Monitors low-side FET voltage during conduction; terminates switching cycle if current exceeds threshold - prevents inductor saturation and thermal runaway |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers SoC, memory, and interface ICs in flat-panel TVs requiring tight regulation and low ripple across varying video workloads. IC Role / Device Role / Timing Role: Primary 1.05-V or 1.2-V core supply delivering up to 3 A with <9-mVpp ripple at full load. Use Value: D-CAP2™ control maintains regulation during rapid CPU/GPU load transients without external compensation, reducing BOM count and board area. | Use Scenario: Supplies FPGA, PHY, and microcontroller rails in residential gateways and DSL/cable modems operating in thermally constrained enclosures. IC Role / Device Role / Timing Role: Main 3.3-V or 2.5-V system rail with power-good signaling to enable sequenced startup and fault reporting. Use Value: Integrated FETs and HTSSOP thermal pad enable >91% efficiency at 1.2-A load while meeting industrial temperature range (–40°C to 85°C). |
| Digital Set Top Box (STB) | High Definition Blu-ray Disc™ Player |
Use Scenario: Generates multiple low-voltage rails (e.g., 1.8-V, 2.5-V) for demodulator, decoder, and HDMI interface ICs in compact STB designs. IC Role / Device Role / Timing Role: Secondary buck converter supporting dynamic voltage scaling and low-quiescent-current standby modes. Use Value: <10-μA shutdown current and adjustable soft-start support energy-efficient power management compliant with EU ErP Lot 6 standards. | Use Scenario: Provides clean, low-noise 1.05-V core supply to media processor and DDR memory in Blu-ray players with strict EMI limits. IC Role / Device Role / Timing Role: High-Precision synchronous buck regulator with ceramic-capacitor compatibility and minimal output ripple. Use Value: Low ESR FETs and D-CAP2™ architecture achieve <10-mVpp ripple at 3-A load - eliminating need for costly tantalum or POSCAP bulk capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54328DDAR | Same D-CAP2™ architecture, 4.5–18-V input, but rated for 4-A output; higher RDS(on) (130 mΩ/85 mΩ); no VREG5 output | Supports higher current loads but lacks integrated 5.5-V LDO - requires external bias supply for gate drivers | Select when >3-A output current is required and external VREG5 generation is acceptable |
| MP2332HGTL-Z | Monolithic 3-A buck with 4.5–18-V input, 700-kHz fixed frequency, but uses voltage-mode control; no pre-biased soft-start or power-good output | Lacks autonomous power sequencing features; requires external compensation network and feedback resistors with tighter tolerance | Select for cost-sensitive, non-sequencing applications where D-CAP2™ transient performance is not critical |
Compared with TPS54325PWPR, TPS54328DDAR offers higher current capacity at the expense of missing VREG5 and slightly lower efficiency, while MP2332HGTL-Z trades D-CAP2™ simplicity and robustness for lower BOM cost and less advanced protection features.
Availability
TPS54325PWPR is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and digital set-top boxes requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54325PWPR 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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer markets.
The TPS54325PWPR belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-efficiency, low-component-count DC/DC regulation in space-constrained consumer electronics with demanding transient response requirements.
FAQ
What is the recommended input voltage range for reliable operation of the TPS54325PWPR?
The TPS54325PWPR is specified for reliable operation with VCC input from 4.5 V to 18 V. While VIN can range from 2.0 V to 18 V, operation below 4.5 V is limited by UVLO (typical 3.7 V) and may result in reduced switching performance or dropout. For full specification compliance and thermal stability, maintain VCC ≥ 4.5 V. The TPS54325PWPR datasheet confirms this range in Section 7.4 Recommended Operating Conditions.
Does the TPS54325PWPR support pre-biased output startup, and how does it work?
Yes, the TPS54325PWPR supports pre-biased soft-start. When the output is pre-charged, the device avoids reverse current by initially activating the low-side FET with narrow, incrementally increasing on-times until reaching normal duty-cycle operation. This behavior is implemented autonomously via internal logic monitoring VFB vs SS voltage and is confirmed in Section 8.3.1 of the TPS54325PWPR datasheet.
What is the purpose of the VREG5 pin on the TPS54325PWPR, and what load can it drive?
The VREG5 pin on the TPS54325PWPR provides a regulated 5.5-V output (5.3–5.7 V) to power internal gate drivers and logic. It can deliver up to 70 mA (min) at 25°C and is specified for 0–5 mA load in regulation. External use is permitted but must stay within IVREG5 limits; a 1-μF ceramic capacitor to GND is mandatory. This is documented in Section 7.5 Electrical Characteristics of the TPS54325PWPR datasheet.
How does the TPS54325PWPR implement overcurrent protection, and is it latching?
The TPS54325PWPR uses cycle-by-cycle valley-current limiting, monitoring low-side FET voltage during conduction to detect overcurrent. If exceeded, the switching cycle terminates immediately and restarts with fixed on-time. This protection is non-latching - normal operation resumes automatically once the overload clears. Thermal shutdown (150°C) and OVP/UVP are also non-latching. These behaviors are detailed in Sections 8.3.4 and 8.3.5 of the TPS54325PWPR datasheet.
Can the TPS54325PWPR operate with ceramic output capacitors only, and why?
Yes, the TPS54325PWPR is explicitly designed for ceramic output capacitors. Its D-CAP2™ control architecture includes internal ripple injection to stabilize the loop without requiring ESR-based feedback, enabling stable regulation with ultra-low-ESR ceramics (22–68 μF typical). This eliminates need for POSCAP or tantalum alternatives and is validated in Section 8.1 Overview and Figure 4 Typical Application of the TPS54325PWPR datasheet.
TPS54325PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- 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:
- 14-HTSSOP
TPS54325PWPR FAQ
1.How can I place an order for TPS54325PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54325PWPR 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 TPS54325PWPR reliable?
The price and inventory of TPS54325PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54325PWPR is usually 5 days.
3.What payment methods are accepted for TPS54325PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54325PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54325PWPR?
TPS54325PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54325PWPR 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 TPS54325PWPR?
For technical support, including TPS54325PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54325PWPR requirements.
6.How does Aetrix verify that TPS54325PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54325PWPR 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 TPS54325PWPR meets industry standards.
7.What is the process for return or replacement of TPS54325PWPR?
All TPS54325PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54325PWPR, 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 TPS54325PWPR part is unused and in its original packaging.
Return procedure for TPS54325PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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