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Texas Instruments TPS54312PWPR
- Part No.:
- TPS54312PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54312PWPR.pdf
- Description:
- IC REG BUCK 1.2V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,085
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Product details
Overview
TPS54312PWPR from Texas Instruments is a synchronous buck PWM DC-DC converter with integrated 60-mΩ high- and low-side MOSFETs, delivering up to 3 A continuous output current at a fixed 1.2 V output voltage with ±2.5% regulation over load, line, and temperature. It operates from a 3 V to 6 V input, features internal compensation, and targets point-of-load regulation for FPGAs and microprocessors.
For engineers reviewing the TPS54312PWPR datasheet, TPS54312PWPR pinout, TPS54312PWPR application, or TPS54312PWPR equivalent, key selection considerations include its fixed 1.2 V 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) functionality.
Technical Context
The TPS54312PWPR implements a voltage-mode synchronous buck topology with an internally compensated error amplifier (26 dB open-loop gain, 3–5 MHz unity-gain bandwidth), adaptive dead-time control to prevent shoot-through, and cycle-by-cycle peak current limiting with 100 ns leading-edge blanking. Its UVLO circuit enforces a 2.95 V startup threshold and 2.8 V shutdown threshold with 0.16 V hysteresis.
It integrates a 2.8 V internal bias regulator (VBIAS) supplying internal circuitry, supports external slow-start via capacitor on SS/ENA (typical internal time = 4.5 ms for 1.2 V output), and provides a 0.891 V precision reference trimmed during manufacturing for initial accuracy of ±1.0% at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V with ±2.5% regulation across –40°C to 125°C, 0–3 A load, and 3–6 V input. |
| Input Voltage Range | 3 V to 6 V - supports 3.3 V and 5 V distributed rails without external LDO pre-regulation. |
| Continuous Output Current | 3 A - sustained sourcing and sinking capability enables fast transient response for digital loads. |
| Switching Frequency | Fixed 350 kHz or 550 kHz (via FSEL pin), or adjustable 280–700 kHz (via RT resistor to AGND). |
| Power MOSFET rDS(on) | 60 mΩ high-side and matched low-side - enables >90% efficiency at 3 A, 5 VIN → 1.2 VOUT. |
| Thermal Resistance (θJA) | 26.0°C/W with soldered PowerPAD™ - requires minimum 10 thermal vias to AGND for full 3 A operation at 125°C ambient. |
| Quiescent Current | 6.2–12.8 mA depending on frequency mode - optimized for low-noise, high-efficiency operation in active regulation. |
Pinout & Package
TPS54312PWPR is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ for direct PCB thermal conduction. The package measures 6.5 mm × 4.4 mm × 1.2 mm and requires soldering the PowerPAD™ to a large AGND copper pour with ≥10 thermal vias for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return for compensation network, VBIAS capacitor, RT resistor, and FSEL - must connect PowerPAD™ directly to this node. |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct connection to output voltage feedback node - determines regulation accuracy and loop stability. |
| NC (Pin 3) | No internal connection | Unbonded pad - must remain unconnected and unstubbed on PCB layout. |
| PWRGD (Pin 4) | Open-drain power-good indicator | Pulled low if VSENSE < 90% Vref, SS/ENA low, or thermal shutdown - used for processor reset sequencing. |
| BOOT (Pin 5) | Bootstrap supply for high-side driver | Connects 0.022–0.1 µF ceramic capacitor to PH - enables floating gate drive for N-channel high-side MOSFET. |
| PH (Pins 6–10) | Phase node (switching node) | Junction of internal MOSFETs and output inductor - high di/dt node requiring minimized loop area and tight coupling to PGND. |
| RT (Pin 20) | Frequency setting resistor input | Connect resistor to AGND to set 280–700 kHz frequency - value determines exact switching frequency per TI equation. |
| SS/ENA (Pin 18) | Slow-start/enable control | Logic-high (>1.2 V) enables operation; capacitor to AGND extends soft-start time - also serves as enable/disable control. |
| VBIAS (Pin 17) | Internal bias regulator output | Supplies 2.7–2.9 V to internal circuitry - bypass with 0.1–1.0 µF X7R/X5R ceramic capacitor to AGND. |
| VIN (Pins 14–16) | Main input supply | 3–6 V input for power switches and bias regulator - requires local 1–10 µF low-ESR ceramic bypass to PGND. |
| PGND (Pins 11–13) | Power ground return | High-current return path for low-side FET and input/output capacitors - must tie to large copper plane with minimal impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFETs | Eliminates need for external power switches and reduces total solution size by >40% vs discrete controllers. |
| Internally compensated control loop | Enables stable operation with standard 4.7–10 µH inductors and common output capacitors - no external compensation required. |
| Fast transient response | 10–20 µs recovery time from load steps due to high-bandwidth error amplifier and cycle-by-cycle current limiting. |
| Powergood (PWRGD) output | Provides system-level fault signaling and processor reset coordination when output drops below 90% of 1.2 V setpoint. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and restarts at 140°C - protects against sustained overload or poor heatsinking. |
Applications
| FPGA Core Supply | Microprocessor I/O Rail |
|---|---|
Use Scenario: Powering 1.2 V core voltage of Xilinx Spartan-7 or Intel Cyclone V FPGA under dynamic logic switching. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 1.2 V at up to 3 A with fast transient response. Use Value: Maintains <±2.5% output accuracy during 2 A load steps, enabling reliable FPGA configuration and operation without brownout. |
Use Scenario: Supplying 1.2 V I/O bank voltage for ARM Cortex-A series microprocessors in industrial HMIs. IC Role / Device Role / Timing Role: Point-of-load regulator with PWRGD signaling for safe boot sequence coordination with host MCU. Use Value: Integrated powergood ensures processor only releases reset after stable 1.2 V rail is confirmed - prevents firmware corruption. |
| DSP Digital Signal Processing | ASIC Memory Interface |
Use Scenario: Providing clean 1.2 V supply to TI C6000 DSPs during intensive FFT computation with burst current demands. IC Role / Device Role / Timing Role: High-efficiency buck converter with low-noise VBIAS output usable as analog reference for ADC peripherals. Use Value: 60-mΩ MOSFETs and internal compensation deliver >92% efficiency at 2.5 A, reducing thermal load in compact enclosures. |
Use Scenario: Regulating 1.2 V for LPDDR4 memory interface in edge AI accelerators with strict voltage tolerance. IC Role / Device Role / Timing Role: Precision voltage regulator with ±1.0% initial accuracy and thermal drift compensation. Use Value: 0.891 V trimmed reference and internal error amplifier ensure long-term stability within LPDDR4 VDDQ spec limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54318RTER | Same 1.2 V output, but in 16-pin WQFN (3×3 mm) with wettable flanks; lower θJA (22.5°C/W); no FSEL pin - fixed 570 kHz frequency. | Better suited for space-constrained, high-density PCBs where thermal vias under QFN are preferred over HTSSOP PowerPAD™. | Select TPS54318RTER for miniaturized designs needing higher power density and automated optical inspection support. |
| MP2315GJ-Z | 1.2 V fixed output, 3 A rating, but uses external compensation; 500 kHz fixed frequency; no PWRGD or VBIAS output; smaller 8-pin SOIC package. | Lacks power sequencing and bias rail features - appropriate for cost-sensitive, non-critical loads without system-level coordination needs. | Choose MP2315GJ-Z only when board space and BOM cost outweigh requirements for powergood signaling and integrated bias regulation. |
Compared with TPS54312PWPR, TPS54318RTER offers superior thermal performance in a smaller footprint but sacrifices frequency flexibility, while MP2315GJ-Z reduces cost and size at the expense of system-level features like PWRGD and VBIAS - making TPS54312PWPR optimal for robust, sequenced digital power delivery.
Availability
TPS54312PWPR is available at Aetrix Electronics and suitable for FPGA core supplies, microprocessor I/O rails, and DSP digital signal processing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and embedded programs.
Supply support for TPS54312PWPR 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 ICs, with decades of expertise in high-reliability power conversion solutions.
The TPS5431x family belongs to TI's SWIFT™ synchronous buck regulator product line, designed specifically for low-input-voltage, high-output-current point-of-load applications in computing, communications, and industrial systems.
FAQ
What is the output voltage tolerance of the TPS54312PWPR over temperature and load?
The TPS54312PWPR maintains ±2.5% output voltage regulation across –40°C to 125°C junction temperature, 0–3 A load current, and 3–6 V input voltage. This specification includes initial accuracy, line regulation (0.21%/V), and load regulation (0.21%/A), all verified per TI SLVS416C datasheet Section 6.5. The TPS54312PWPR achieves this using a factory-trimmed 0.891 V reference and internal error amplifier compensation.
Does the TPS54312PWPR support external frequency synchronization?
No, the TPS54312PWPR does not support external clock synchronization. It offers three frequency modes: fixed 350 kHz, fixed 550 kHz (selected via FSEL pin), or adjustable 280–700 kHz (set by RT resistor to AGND). Unlike the TPS54310, it lacks a SYNC pin - so timing coordination with other converters requires matching free-running frequencies or using external logic, not phase-locked synchronization.
How is thermal management implemented in the TPS54312PWPR package?
The TPS54312PWPR uses a 20-pin HTSSOP (PWP) package with an exposed PowerPAD™ thermal pad that must be soldered to a large AGND copper area with ≥10 thermal vias. With proper layout, its junction-to-ambient thermal resistance is 26.0°C/W. At 3 A output and 5 V input, typical power dissipation is ~0.6 W - requiring this thermal design to maintain ≤125°C junction temperature in 70°C ambient environments.
Can the TPS54312PWPR sink current during light-load or transient conditions?
Yes, the TPS54312PWPR supports continuous current sinking - a key feature for powering digital loads with rapid current transients. During negative load steps or output overshoot, the low-side MOSFET remains active to pull current from the output capacitor back to PGND, enabling fast recovery and preventing overvoltage. This behavior is explicitly documented in Section 7.3.7 of the SLVS416C datasheet.
What is the function of the VBIAS pin on the TPS54312PWPR?
The VBIAS pin on the TPS54312PWPR outputs a regulated ~2.8 V supply derived from VIN, used to power internal analog and digital circuitry including the error amplifier and PWM comparator. It must be bypassed with a 0.1–1.0 µF X7R/X5R ceramic capacitor to AGND. While primarily internal, VBIAS can serve as a stable reference for external circuits - but loading beyond 100 µA risks degrading regulation accuracy or noise immunity.
TPS54312PWPR 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:
- Active
- 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
TPS54312PWPR FAQ
1.How can I place an order for TPS54312PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54312PWPR 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 TPS54312PWPR reliable?
The price and inventory of TPS54312PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54312PWPR is usually 5 days.
3.What payment methods are accepted for TPS54312PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54312PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54312PWPR?
TPS54312PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54312PWPR 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 TPS54312PWPR?
For technical support, including TPS54312PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54312PWPR requirements.
6.How does Aetrix verify that TPS54312PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54312PWPR 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 TPS54312PWPR meets industry standards.
7.What is the process for return or replacement of TPS54312PWPR?
All TPS54312PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54312PWPR, 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 TPS54312PWPR part is unused and in its original packaging.
Return procedure for TPS54312PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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