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Texas Instruments TPS54312PWPG4
- Part No.:
- TPS54312PWPG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54312PWPG4.pdf
- Description:
- IC REG BUCK 1.2V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
TPS54312PWPG4 from Texas Instruments is a 3-V to 6-V input, 3-A synchronous buck PWM converter with integrated high- and low-side MOSFETs, fixed 1.2-V output voltage, ±2.5% output regulation over load/temperature, and internal compensation. It delivers point-of-load power to FPGAs, DSPs, and microprocessors in space-constrained industrial and computing systems.
For engineers reviewing the TPS54312PWPG4 datasheet, TPS54312PWPG4 pinout, TPS54312PWPG4 application, or TPS54312PWPG4 equivalent, key selection considerations include its 1.2-V fixed output, HTSSOP-20 PowerPAD™ package with thermal vias, 350/550 kHz fixed or 280–700 kHz adjustable switching frequency, and integrated powergood (PWRGD) and slow-start/enable (SS/ENA) functions.
Technical Context
The TPS54312PWPG4 implements a voltage-mode synchronous buck topology with an internally compensated error amplifier, adaptive dead-time control, and cycle-by-cycle peak current limiting. Its UVLO activates at 2.95 V and releases at 2.80 V, while the 0.891-V precision bandgap reference enables tight output regulation.
It supports dual-frequency selection via FSEL pin (350 kHz or 550 kHz) or external RT resistor programming (280–700 kHz), and integrates a 2.8-V bias regulator (VBIAS) for internal circuitry with 100 µA output capability. The PWRGD open-drain output asserts low when VSENSE falls below 90% of Vref, VIN drops below UVLO, or SS/ENA is deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 6 V - supports 3.3-V and 5-V intermediate bus architectures without external regulators |
| Output Voltage | Fixed 1.2 V ±2.5% - factory-trimmed for direct core supply to modern low-voltage processors |
| Continuous Output Current | 3 A - sufficient for mid-tier FPGAs and DSPs with transient headroom via internal current limit |
| Switching Frequency | 350 kHz or 550 kHz (FSEL-selectable); 280–700 kHz (RT-programmable) - balances efficiency, size, and EMI compliance |
| Efficiency @ 5 VIN/1.2 VOUT/2 A | Typically >90% - enabled by 60-mΩ high-side and matched low-side MOSFETs |
| Junction Temp Range | –40°C to +125°C - qualified for industrial ambient and thermally demanding PCB layouts |
| Thermal Resistance (θJA) | 26.0°C/W - achievable with PowerPAD™ soldered to 2-layer 3″×3″ board with thermal vias |
Pinout & Package
TPS54312PWPG4 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ for low-thermal-resistance PCB mounting. Pin numbering follows standard top-view layout with AGND (Pin 1), VSENSE (Pin 2), NC (Pin 3), PWRGD (Pin 4), BOOT (Pin 5), PH (Pins 6–10), RT (Pin 20), and multiple VIN/PGND pins for high-current routing.
| 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 resistors; must connect to PowerPAD™ |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct connection to output voltage sense point for accurate regulation; no series resistance allowed |
| PWRGD (Pin 4) | Open-drain power-good indicator | Signals valid output (≥90% Vref) and asserts low during UVLO, shutdown, or thermal fault - requires external pull-up |
| BOOT (Pin 5) | Bootstrap supply for high-side driver | Connects to PH via 0.022–0.1-µF ceramic capacitor to generate floating gate drive voltage for high-side MOSFET |
| PH (Pins 6–10) | Phase node | High-current switching node connecting internal MOSFETs to external inductor; requires short, low-inductance PCB trace |
| RT (Pin 20) | Frequency setting resistor input | Connects to AGND via resistor (e.g., 100 kΩ for ~500 kHz); enables precise EMI tuning and efficiency optimization |
| SS/ENA (Pin 18) | Slow-start/enable control | Logic-enable input (1.2 V threshold) and external capacitor interface for controlled output ramp-up (6.1 ms typical for TPS54312) |
| VBIAS (Pin 17) | Bias regulator output | Supplies 2.7–2.9 V to internal analog/digital blocks; bypass with 0.1–1.0-µF X7R/X5R ceramic to AGND |
| VIN (Pins 14–16) | Main power input | 3–6 V supply for power switches and bias regulator; each pin carries portion of total input current - parallel routing required |
| PGND (Pins 11–13) | Power ground return | High-current return for low-side MOSFET and input/output capacitors; must tie directly to PowerPAD™ and input/output ground planes |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ high-side and matched low-side MOSFETs | Eliminates external power stage components and reduces board area by >40% vs discrete solutions |
| Internally compensated control loop | Enables stable operation with standard 4.7–10 µH inductors and common output capacitors - no loop compensation design required |
| Fast transient response (10–20 µs recovery) | Minimizes output voltage deviation during sudden load steps in FPGA core domains |
| Programmable soft-start via SS/ENA capacitor | Prevents inrush current damage to input capacitors and upstream supplies during system power-up sequencing |
| Powergood (PWRGD) with 3% hysteresis and 35-µs deglitch | Provides clean, noise-immune reset signal for processors and logic - eliminates need for external supervisor IC |
Applications
| Processor Core Supply | FPGA I/O Bank Regulation |
|---|---|
Use Scenario: Delivering tightly regulated 1.2 V to ARM Cortex-A/M cores or x86 SoC CPU domains in embedded controllers and edge AI modules. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator providing dynamic voltage scaling (DVS)-capable core power with fast load transient response. Use Value: Maintains ±2.5% output accuracy across –40°C to +125°C junction temperature and 0–3 A load range - ensures reliable processor operation under thermal stress. | Use Scenario: Generating stable 1.2 V for high-speed transceivers and configurable logic blocks in Xilinx Artix-7 or Intel Cyclone V FPGAs. IC Role / Device Role / Timing Role: Point-of-load (POL) regulator placed adjacent to FPGA BGA package to minimize IR drop and noise coupling. Use Value: Integrated powergood and programmable soft-start enable safe, sequenced power-up of multi-rail FPGA systems without external timing ICs. |
| Industrial PLC I/O Module | Optical Line Card Bias |
Use Scenario: Powering isolated ADC/DAC signal chains and microcontroller subsystems in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Secondary regulator deriving 1.2 V from a 5-V backplane supply in harsh industrial environments with wide ambient temperature swings. Use Value: Thermal shutdown (150°C trip) and undervoltage lockout (2.95 V start) ensure fail-safe operation during brownouts or cooling failures. | Use Scenario: Supplying bias voltage to laser diode drivers and transimpedance amplifiers in 10G/25G optical transport line cards. IC Role / Device Role / Timing Role: Low-noise, high-PoL regulator operating from a 3.3-V intermediate rail with minimal output ripple (<10 mVpp). Use Value: Internally compensated loop and 60-mΩ MOSFETs achieve >90% efficiency at 2 A - reducing heat dissipation in densely packed optical modules. |
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 non-G4 suffix - RoHS-compliant but not automotive-grade green packaging | No functional difference; suitable for commercial/industrial use where halogen-free requirement is not mandated | Select TPS54312PWP if G4 (halogen-free, lead-free) compliance is unnecessary and cost sensitivity is higher |
| TPS54318RTJR | 3-A, 1.2-V fixed-output buck with integrated FETs, but in 16-pin QFN (3 mm × 3 mm) - smaller footprint, higher θJA (36°C/W) | Better for ultra-compact designs; requires more careful thermal management due to lower power density tolerance | Choose TPS54318RTJR only when board space is critical and thermal margin allows - verify θJA derating per layout |
Compared with TPS54312PWP, the TPS54312PWPG4 adds halogen-free, lead-free packaging compliance for automotive and green electronics programs; compared with TPS54318RTJR, it trades compactness for superior thermal performance via PowerPAD™ and larger copper area utilization.
Availability
TPS54312PWPG4 is available at Aetrix Electronics and suitable for industrial PLCs, FPGA-based test equipment, and optical networking line cards requiring stable component supply, long-term lifecycle support, and guaranteed green-material compliance.
Supply support for TPS54312PWPG4 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 DC-DC conversion.
The TPS5431x family was designed specifically for high-density, low-voltage point-of-load applications in computing, communications, and industrial systems - emphasizing integration, thermal robustness, and ease of design-in.
FAQ
What is the exact output voltage tolerance of the TPS54312PWPG4 over full temperature and load range?
The TPS54312PWPG4 provides a fixed 1.2-V output with ±2.5% regulation accuracy across the 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 verified per TI's SLVS416C datasheet Section 6.5, Table "OUTPUT VOLTAGE", row "TPS54312".
Does the TPS54312PWPG4 support external frequency synchronization?
No, the TPS54312PWPG4 does not support external clock synchronization. It offers only three frequency modes: 350 kHz (FSEL ≤0.8 V), 550 kHz (FSEL ≥2.5 V), or externally adjustable 280–700 kHz (FSEL floating, RT resistor to AGND). The SYNC pin is absent - this functionality exists only in the TPS54310 variant.
How is thermal performance affected if the PowerPAD™ on the TPS54312PWPG4 is not soldered to PCB ground?
If the PowerPAD™ is unsoldered, the TPS54312PWPG4's junction-to-ambient thermal resistance increases from 26.0°C/W to 57.5°C/W (per Section 6.3), reducing maximum allowable power dissipation by >50%. At 70°C ambient, rated output current drops from 3 A to approximately 1.5 A - making soldered PowerPAD™ mandatory for full-spec operation.
Can the TPS54312PWPG4 sink current during light-load or transient conditions?
Yes, the TPS54312PWPG4 supports continuous current sinking - a key feature of its synchronous buck architecture. During output voltage overshoot or rapid load reduction, the low-side MOSFET actively conducts to pull current from the output capacitor back to ground, enabling fast transient recovery and preventing overvoltage events.
What is the recommended minimum slow-start capacitor value for the TPS54312PWPG4 SS/ENA pin?
Texas Instruments specifies no absolute minimum capacitor value for the SS/ENA pin, but recommends ≥1 nF for noise immunity. For the TPS54312PWPG4's nominal 6.1-ms internal slow-start time, a 10-nF capacitor extends startup to ~12 ms; a 100-nF capacitor yields ~120 ms. Always use X7R/X5R ceramic with low ESR and place close to the pin per Section 7.3.2.
TPS54312PWPG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
TPS54312PWPG4 FAQ
1.How can I place an order for TPS54312PWPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54312PWPG4 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 TPS54312PWPG4 reliable?
The price and inventory of TPS54312PWPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54312PWPG4 is usually 5 days.
3.What payment methods are accepted for TPS54312PWPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54312PWPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54312PWPG4?
TPS54312PWPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54312PWPG4 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 TPS54312PWPG4?
For technical support, including TPS54312PWPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54312PWPG4 requirements.
6.How does Aetrix verify that TPS54312PWPG4 is sourced from the original manufacturer or authorized distributors?
All TPS54312PWPG4 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 TPS54312PWPG4 meets industry standards.
7.What is the process for return or replacement of TPS54312PWPG4?
All TPS54312PWPG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54312PWPG4, 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 TPS54312PWPG4 part is unused and in its original packaging.
Return procedure for TPS54312PWPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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