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Texas Instruments TPS54312PWPRG4
- Part No.:
- TPS54312PWPRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54312PWPRG4.pdf
- Description:
- IC REG BUCK 1.2V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS54312PWPRG4 from Texas Instruments is a 3-A synchronous buck PWM converter with integrated 60-mΩ high- and low-side MOSFETs, fixed 1.2-V output, and 3-V to 6-V input range. It delivers regulated power for FPGA core rails, DSP supply domains, and point-of-load applications requiring fast transient response and thermal robustness in compact layouts.
For engineers reviewing the TPS54312PWPRG4 datasheet, TPS54312PWPRG4 pinout, TPS54312PWPRG4 application, or TPS54312PWPRG4 equivalent, key selection criteria include its 1.2-V ±2.5% output accuracy over temperature and load, 350/550 kHz fixed-frequency operation or 280–700 kHz adjustable switching, internal compensation, and PowerPAD™ HTSSOP-20 thermal performance.
Technical Context
The TPS54312PWPRG4 implements a voltage-mode synchronous buck architecture with an integrated high-performance error amplifier (26 dB gain, 3–5 MHz unity-gain bandwidth) and adaptive dead-time control to prevent shoot-through. Its PWM comparator features 70–85 ns propagation delay and 100 ns leading-edge blanking for reliable current-limit detection.
Startup is managed by a dual-function SS/ENA pin enabling both logic-level enable control and external capacitor-programmable soft-start (6.1 ms typical for 1.2-V output), while the PWRGD open-drain signal asserts when VSENSE falls below 90% of 0.891-V reference-supporting processor reset and supply sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±2.5% over −40°C to +125°C, 0–3 A load, 3–6 V input - ensures stable core rail for low-voltage digital ICs. |
| Input Voltage Range | 3 V to 6 V - compatible with 3.3-V and 5-V intermediate bus architectures without pre-regulation. |
| Continuous Output Current | 3 A - supports high-current FPGA I/O banks and microprocessor subsystems in space-constrained designs. |
| Switching Frequency | Fixed 350 kHz or 550 kHz (via FSEL), or 280–700 kHz adjustable (via RT resistor) - enables EMI optimization and inductor size trade-offs. |
| Efficiency | Peak >90% at 3.3-V input / 1.2-V output / 2-A load - reduces thermal load and improves system power density. |
| Thermal Resistance | RθJA = 26.0°C/W (with PowerPAD™ soldered) - allows 3-A operation up to +85°C ambient without forced airflow. |
| Protection Features | Cycle-by-cycle overcurrent limit (4.5–7.5 A), thermal shutdown (135–165°C trip), UVLO (2.95 V start), and PWRGD monitoring - enables robust, self-protecting POL regulation. |
Pinout & Package
TPS54312PWPRG4 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad on underside, requiring solder connection to AGND plane for optimal heat dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return path for feedback divider, SS/ENA capacitor, VBIAS bypass, and RT/FSEL bias - must be connected to PowerPAD™ for stability. |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct connection to output voltage sense point - determines regulation accuracy and loop stability. |
| NC (Pin 3) | No internal connection | Unbonded die pad - leave unconnected and unrouted on PCB. |
| PWRGD (Pin 4) | Open-drain power-good indicator | Pulled low if VSENSE < 90% Vref, SS/ENA low, or UVLO active - used for system reset and sequencing control. |
| BOOT (Pin 5) | Bootstrap supply for high-side gate driver | Connects via 0.022–0.1 µF ceramic capacitor to PH - enables floating gate drive for integrated high-side MOSFET. |
| PH (Pins 6–10) | Phase node (switching node) | Junction of internal high/low-side FETs - connects directly to output inductor - requires tight layout to minimize ringing and EMI. |
| RT (Pin 20) | Frequency setting resistor input | Resistor to AGND sets switching frequency from 280–700 kHz - enables precise EMI tuning and efficiency optimization. |
| SS/ENA (Pin 18) | Slow-start/enable control | Logic-high (>1.2 V) enables device; external capacitor extends startup time - critical for inrush current limiting and sequencing. |
| VBIAS (Pin 17) | Internal bias regulator output | Supplies 2.7–2.9 V to internal circuitry - requires 0.1–1.0 µF X7R/X5R ceramic bypass to AGND near pin. |
| VIN (Pins 14–16) | Main input supply | 3–6 V input for power switches and bias regulator - each pin must be individually bypassed to PGND with 1–10 µF ceramic capacitor. |
| PGND (Pins 11–13) | Power ground return | High-current return for low-side FET and input/output capacitors - connect to large copper pour and thermal vias to PowerPAD™. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFETs | Enables full 3-A continuous output without external power devices - reduces BOM count and layout area by eliminating discrete FETs and drivers. |
| Internally compensated control loop | Eliminates need for external compensation components - simplifies design, accelerates prototyping, and guarantees stability with standard 4.7–10 µH inductors. |
| Fast transient response | 10–20 µs recovery time under load steps - maintains tight regulation during FPGA core state transitions and burst-mode processor activity. |
| PowerPAD™ HTSSOP-20 package | 26.0°C/W junction-to-ambient thermal resistance with soldered thermal pad - sustains full 3-A load at +85°C ambient without heatsink or fan. |
| Programmable soft-start | 6.1 ms typical internal ramp time for 1.2-V output, extendable with external capacitor - prevents inrush current damage to input capacitors and upstream supplies. |
Applications
| Point-of-Load for FPGA Core Rails | Low-Voltage DSP Supply Domain |
|---|---|
Use Scenario: Powers 1.2-V core voltage of Xilinx Artix-7 or Intel Cyclone V FPGA in industrial control PLCs. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering tightly regulated, low-noise 1.2-V supply with fast transient response to handle dynamic core current demands. Use Value: Maintains ±2.5% output accuracy across −40°C to +125°C junction temperature and 0–3 A load - ensures FPGA functional integrity and timing closure. | Use Scenario: Supplies 1.2-V I/O or memory interface voltage for TI C6000 DSPs in broadband baseband processing units. IC Role / Device Role / Timing Role: Synchronous buck converter providing clean, sequenced power with PWRGD signaling for multi-rail DSP boot-up. Use Value: PWRGD output synchronizes DSP reset release only after stable 1.2-V rail is confirmed - eliminates boot failures due to premature initialization. |
| Optical Transceiver Module Bias | Notebook PC CPU Voltage Regulator |
Use Scenario: Generates 1.2-V bias for laser driver ICs and TIAs in SFP+ and QSFP28 optical modules operating in telecom equipment. IC Role / Device Role / Timing Role: Compact, thermally efficient POL regulator meeting strict size and thermal constraints inside sealed transceiver cages. Use Value: PowerPAD™ HTSSOP-20 package achieves 3-A capability in <100 mm² footprint - fits within dense optical module PCB real estate. | Use Scenario: Provides adaptive 1.2-V core voltage to Intel Atom or AMD Jaguar-class processors in ultra-thin notebooks. IC Role / Device Role / Timing Role: Main CPU voltage regulator supporting dynamic voltage scaling (DVS) via external VID or enable sequencing. Use Value: Adjustable 280–700 kHz switching frequency allows EMI spread-spectrum tuning to pass CISPR-32 Class B emissions limits in portable systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54312PWP | Same silicon, identical electrical specs, but no G4 suffix - RoHS-compliant but not automotive-grade (AEC-Q100 not certified). | Acceptable for commercial/industrial use where automotive qualification is not required. | Select TPS54312PWP for cost-sensitive non-automotive designs; TPS54312PWPRG4 preferred for automotive infotainment or ADAS sub-systems. |
| MP2332HG-12-LF-Z | Monolithic 3-A buck with 1.2-V fixed output, but 4.5–28-V input range and 500-kHz fixed frequency - lacks adjustable frequency, PWRGD, and thermal shutdown hysteresis. | Suitable for higher-input systems (e.g., 12-V intermediate bus), but not for 3.3-V input applications. | Choose MP2332HG-12-LF-Z only when input exceeds 6 V; TPS54312PWPRG4 remains optimal for 3–6-V bus architectures. |
Compared with TPS54312PWP, the TPS54312PWPRG4 adds automotive qualification and enhanced traceability; compared with MP2332HG-12-LF-Z, it offers lower input range compatibility, programmable frequency, and integrated power-good signaling - making it superior for precision 3–6-V POL systems.
Availability
TPS54312PWPRG4 is available at Aetrix Electronics and suitable for FPGA power delivery, DSP supply domains, and optical transceiver biasing requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for TPS54312PWPRG4 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 TPS5431x family was engineered specifically for high-density, low-voltage point-of-load regulation in FPGA, DSP, ASIC, and microprocessor applications - emphasizing integration, thermal efficiency, and ease of use in space-constrained systems.
FAQ
What is the output voltage tolerance of the TPS54312PWPRG4 over temperature and load?
The TPS54312PWPRG4 provides a fixed 1.2-V output with ±2.5% initial accuracy over full operating conditions: −40°C to +125°C junction temperature, 3 V to 6 V input, and 0 A to 3 A load. This specification is guaranteed per TI's SLVS416C datasheet Section 6.5, ensuring consistent core rail performance for sensitive digital ICs without external trimming.
Does the TPS54312PWPRG4 require external compensation components?
No, the TPS54312PWPRG4 features an internally compensated voltage-mode control loop. Its error amplifier is gain-limited to ensure stability with standard 4.7 µH to 10 µH output inductors and typical ceramic output capacitors - eliminating external compensation networks and reducing design risk.
How does the PWRGD pin function on the TPS54312PWPRG4?
The PWRGD pin on the TPS54312PWPRG4 is an open-drain output that goes high-impedance only when VSENSE ≥ 90% of the 0.891-V internal reference, SS/ENA is high, VIN is above UVLO, and thermal shutdown is inactive. It pulls low otherwise - enabling reliable power sequencing and processor reset in multi-rail systems.
What thermal performance can be expected from the TPS54312PWPRG4 in a standard PCB layout?
With proper implementation - including soldered PowerPAD™, 10 thermal vias to inner ground planes, and 1.5 oz copper - the TPS54312PWPRG4 achieves RθJA = 26.0°C/W. At 3 A load and 5 V input, typical power loss is ~1.1 W, allowing continuous operation up to +85°C ambient without forced cooling per TI's thermal characterization data.
Can the switching frequency of the TPS54312PWPRG4 be adjusted, and how?
Yes, the TPS54312PWPRG4 supports three frequency modes: fixed 350 kHz (FSEL ≤0.8 V), fixed 550 kHz (FSEL ≥2.5 V), or externally adjustable 280–700 kHz via a resistor from RT to AGND (e.g., 100 kΩ yields ~500 kHz). The FSEL and RT pins provide flexible EMI management and inductor sizing without changing the TPS54312PWPRG4 part number.
TPS54312PWPRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 20-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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 350kHz, 550kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
TPS54312PWPRG4 FAQ
1.How can I place an order for TPS54312PWPRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54312PWPRG4 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 TPS54312PWPRG4 reliable?
The price and inventory of TPS54312PWPRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54312PWPRG4 is usually 5 days.
3.What payment methods are accepted for TPS54312PWPRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54312PWPRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54312PWPRG4?
TPS54312PWPRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54312PWPRG4 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 TPS54312PWPRG4?
For technical support, including TPS54312PWPRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54312PWPRG4 requirements.
6.How does Aetrix verify that TPS54312PWPRG4 is sourced from the original manufacturer or authorized distributors?
All TPS54312PWPRG4 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 TPS54312PWPRG4 meets industry standards.
7.What is the process for return or replacement of TPS54312PWPRG4?
All TPS54312PWPRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54312PWPRG4, 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 TPS54312PWPRG4 part is unused and in its original packaging.
Return procedure for TPS54312PWPRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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