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Texas Instruments TPS54312QPWPREP
- Part No.:
- TPS54312QPWPREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54312QPWPREP.pdf
- Description:
- IC REG BUCK 1.2V 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
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Product details
Overview
TPS54312QPWPREP from Texas Instruments is a radiation-hardened, high-efficiency synchronous buck PWM 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 ±3% regulation over –55°C to 125°C. It operates from a 3-V to 6-V input, features internal compensation, and supports adjustable switching frequency from 280 kHz to 700 kHz via RT resistor or dual fixed frequencies (350/550 kHz) via FSEL pin. It is used in point-of-load regulation for space-grade FPGAs and radiation-tolerant DSPs.
For engineers reviewing the TPS54312QPWPREP datasheet, TPS54312QPWPREP pinout, TPS54312QPWPREP application, or TPS54312QPWPREP equivalent, key selection considerations include its extended temperature range (–55°C to 125°C), PowerPAD™ thermal package, integrated current-limit and thermal shutdown protection, and compatibility with SWIFT™ design tools for rapid power supply development.
Technical Context
This device implements a voltage-mode PWM control architecture with a high-bandwidth error amplifier (3–5 MHz unity-gain bandwidth) and adaptive dead-time logic to prevent shoot-through in the integrated N-channel MOSFET pair. The oscillator supports both internally set (350/550 kHz) and externally adjustable (280–700 kHz) frequencies via RT resistor or external sync signal on FSEL.
It integrates an undervoltage lockout (UVLO) with 2.95 V start threshold and 2.8 V stop threshold, a slow-start/enable function with 4.5 ms internal ramp time for 1.2 V output, and a power-good open-drain output asserting when VSENSE ≥ 90% of 0.891 V reference. All analog and power grounds are segregated internally and require separate PCB planes tied only at the PowerPAD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V with ±3% accuracy over full temperature and load range - enables direct powering of core logic without external feedback resistors. |
| Input Voltage Range | 3 V to 6 V - compatible with standard 3.3 V and 5 V intermediate bus architectures in aerospace systems. |
| Continuous Output Current | 3 A - sufficient for mid-power FPGA I/O banks or microprocessor cores in radiation-hardened platforms. |
| Switching Frequency | Adjustable 280–700 kHz or fixed 350/550 kHz - allows optimization of efficiency vs. size trade-offs in constrained board layouts. |
| Thermal Operating Range | –55°C to 125°C junction - qualified per JEDEC extended temp standards for space and avionics applications. |
| Integrated MOSFET rDS(on) | 60 mΩ high-side / 60 mΩ low-side at VI = 6 V - minimizes conduction loss and eliminates need for external power switches. |
| Protection Features | Peak current limit (4–6.5 A), thermal shutdown (135–165°C trip), UVLO, and power-good monitoring - ensures robust operation under fault conditions without external circuitry. |
Pinout & Package
The TPS54312QPWPREP is housed in a thermally enhanced 20-pin HTSSOP (PWP) PowerPAD™ package with exposed thermal pad soldered to AGND. This package eliminates heatsinks and enables high-power density designs in space-constrained environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (Pin 1) | Analog ground reference | Return for error amplifier, SS/ENA capacitor, VBIAS bypass, and RT/FSEL bias - must connect directly to PowerPAD and isolated analog ground plane. |
| VSENSE (Pin 2) | Error amplifier inverting input | Direct connection to output voltage sense point - enables precise regulation without feedback divider; requires Kelvin sensing for best accuracy. |
| NC (Pin 3) | No internal connection | Unbonded pin - must remain unconnected; no routing or copper fill allowed. |
| PWRGD (Pin 4) | Power-good open-drain output | Asserts high-impedance when output reaches ≥90% of 0.891 V reference - used for processor reset sequencing or system fault signaling. |
| BOOT (Pin 5) | Bootstrap gate drive supply | Connects 0.022–0.1 µF ceramic capacitor to PH - generates floating voltage for high-side MOSFET driver; critical for reliable switching. |
| PH (Pins 6–10) | Phase node | Junction of internal high/low-side MOSFETs - connects to output inductor; multiple pins reduce parasitic inductance and improve current sharing. |
| RT (Pin 20) | Frequency setting resistor input | Connect resistor to AGND to set switching frequency from 280–700 kHz - enables precise EMI control and filter optimization. |
| FSEL (Pin 19) | Frequency select logic input | Logic-low (≤0.8 V) selects 350 kHz; logic-high (≥2.5 V) selects 550 kHz - provides simple pin-strapped frequency selection. |
| SS/ENA (Pin 18) | Slow-start/enable control | Enable threshold at 1.2 V; internal 4.5 ms soft-start for 1.2 V output - prevents inrush current and ensures controlled power-up. |
| VBIAS (Pin 17) | Internal bias regulator output | Supplies 2.7–2.95 V to internal circuitry; bypass with 0.1–1 µF X7R/X5R ceramic to AGND - stabilizes control loop under varying load. |
| VIN (Pins 14–16) | Main input supply | 3–6 V input for power MOSFETs and VBIAS regulator - requires local 1–10 µF low-ESR ceramic decoupling near each pin. |
| PGND (Pins 11–13) | Power ground return | High-current return path for low-side MOSFET and input/output capacitors - must tie to large copper pour and connect to input/output caps' negative terminals. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 60-mΩ MOSFET pair | Eliminates external power switches and reduces BOM count by 4+ components while maintaining >90% efficiency at 3 A. |
| Internally compensated control loop | Enables stable operation with standard 4.7–10 µH inductors and 470 µF output capacitors - no external compensation network required. |
| PowerPAD™ thermal package | 26°C/W junction-to-ambient thermal resistance with soldered pad - delivers full 3 A output without heatsink in space-constrained PCBs. |
| Extended temperature qualification | JEDEC-compliant testing including HAST, temperature cycling, and electromigration - certified for mission-critical aerospace use. |
| Adaptive dead-time control | Prevents shoot-through during MOSFET transitions by dynamically adjusting turn-on timing - improves reliability and efficiency across load range. |
Applications
| Spacecraft Onboard Computer Power | Radiation-Tolerant FPGA Core Supply |
|---|---|
Use Scenario: Providing regulated 1.2 V core voltage to Xilinx Virtex-5QV or Actel RTAX-S FPGA in LEO satellite payloads. IC Role / Device Role / Timing Role: Point-of-load synchronous buck regulator with integrated power stage and thermal management. Use Value: Delivers 3 A at ±3% accuracy over –55°C to 125°C, enabling single-rail FPGA core power without external MOSFETs or compensation. |
Use Scenario: Powering DSP cores in radiation-hardened digital signal processors used in deep-space telemetry systems. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with UVLO, thermal shutdown, and power-good signaling for safe boot sequencing. Use Value: Internal slow-start (4.5 ms) and PWRGD output ensure deterministic startup and fault isolation in autonomous spacecraft subsystems. |
| Avionics Flight Control Unit | High-Reliability Industrial Controller |
Use Scenario: Generating 1.2 V for ARM-based flight control MCUs operating in jet engine bays with extreme thermal cycling. IC Role / Device Role / Timing Role: Radiation-hardened buck converter with extended temp range and robust protection features. Use Value: 135–165°C thermal shutdown threshold and 2.95 V UVLO prevent malfunction during transient brownouts or thermal stress events. |
Use Scenario: Powering safety-critical PLC processors in nuclear plant instrumentation where long-term reliability is mandatory. IC Role / Device Role / Timing Role: SWIFT™ family dc/dc regulator with controlled baseline and DMS support for obsolescence mitigation. Use Value: Enhanced Diminishing Manufacturing Sources (DMS) support and qualification pedigree ensure 15+ year supply continuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54312MPWPREP | Same silicon, identical electrical specs, but non-QML-qualified commercial-temp version (–40°C to 125°C). | Lacks radiation hardening, extended temp validation, and QML-Q certification - unsuitable for spaceflight. | Select only for terrestrial industrial applications where radiation tolerance and –55°C operation are not required. |
| LMZ12003TZE/NOPB | 3-A SIMPLE SWITCHER® module with integrated inductor; fixed 1.2 V output; wider input (4.5–20 V); lower efficiency at 3.3 V input. | Module form factor simplifies layout but increases footprint and cost; no RT/FSEL flexibility. | Choose when board space permits larger module and design schedule demands fastest time-to-power without inductor selection. |
Compared with TPS54312QPWPREP, TPS54312MPWPREP offers identical performance in non-radiation environments but lacks QML qualification, while LMZ12003TZE/NOPB trades design flexibility and thermal efficiency for integration simplicity - making TPS54312QPWPREP optimal for weight-, size-, and reliability-critical aerospace systems.
Availability
TPS54312QPWPREP is available at Aetrix Electronics and suitable for spacecraft power distribution, radiation-tolerant FPGA supplies, and avionics flight control units requiring stable component supply across extended temperature and radiation environments.
Supply support for TPS54312QPWPREP 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 high-reliability aerospace ICs, with decades of heritage in space-grade power management.
The TPS54312QPWPREP belongs to TI's SWIFT™ family of radiation-hardened synchronous buck regulators, designed specifically for point-of-load power in mission-critical aerospace and defense systems requiring extended temperature operation and QML qualification.
FAQ
What is the output voltage tolerance of the TPS54312QPWPREP over temperature and load?
The TPS54312QPWPREP delivers a fixed 1.2 V output with ±3.0% initial accuracy over the full operating range of –55°C to 125°C junction temperature and 0 A to 3 A load current. This specification is guaranteed in the Electrical Characteristics table of the official datasheet (SGLS376A), and includes line and load regulation contributions. The precision stems from factory-trimmed bandgap and error amplifier offset cancellation.
Does the TPS54312QPWPREP require external compensation components?
No, the TPS54312QPWPREP is internally compensated and does not require external compensation components. Its control loop is optimized for standard output filter configurations using 4.7 µH to 10 µH inductors and 470 µF output capacitors. This eliminates the need for external RC networks, reducing design complexity and component count while ensuring stability across line, load, and temperature variations.
How is the switching frequency configured on the TPS54312QPWPREP?
The TPS54312QPWPREP supports three frequency modes: (1) 350 kHz with FSEL ≤ 0.8 V and RT open; (2) 550 kHz with FSEL ≥ 2.5 V and RT open; or (3) adjustable 280–700 kHz by connecting a resistor from RT to AGND (e.g., 180 kΩ for ~280 kHz, 68 kΩ for ~700 kHz). External synchronization is also supported from 330–700 kHz via FSEL pin.
What thermal management is required for full 3-A operation of the TPS54312QPWPREP?
For continuous 3-A operation, the TPS54312QPWPREP requires proper PowerPAD™ implementation: solder the exposed thermal pad to a minimum 5 mm² AGND copper area with six 0.013″ vias in the pad and four additional 0.018″ vias under the package. A 3″ × 3″ 1-oz copper plane is recommended for ambient temperatures up to 85°C. Without this, thermal derating applies per the Dissipation Ratings table.
Is the TPS54312QPWPREP pin-compatible with other devices in the TPS5431x-EP family?
Yes, all TPS5431x-EP variants (TPS54311QPWPREP through TPS54316QPWPREP) share identical 20-pin PWP packaging, pinout, and thermal design. Only the fixed output voltage differs (0.9 V to 3.3 V), allowing drop-in replacement in existing layouts when changing output requirements - provided the feedback network (if used) and soft-start timing are verified for the new voltage.
TPS54312QPWPREP 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:
- 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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
TPS54312QPWPREP FAQ
1.How can I place an order for TPS54312QPWPREP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54312QPWPREP 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 TPS54312QPWPREP reliable?
The price and inventory of TPS54312QPWPREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54312QPWPREP is usually 5 days.
3.What payment methods are accepted for TPS54312QPWPREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54312QPWPREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54312QPWPREP?
TPS54312QPWPREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54312QPWPREP 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 TPS54312QPWPREP?
For technical support, including TPS54312QPWPREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54312QPWPREP requirements.
6.How does Aetrix verify that TPS54312QPWPREP is sourced from the original manufacturer or authorized distributors?
All TPS54312QPWPREP 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 TPS54312QPWPREP meets industry standards.
7.What is the process for return or replacement of TPS54312QPWPREP?
All TPS54312QPWPREP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54312QPWPREP, 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 TPS54312QPWPREP part is unused and in its original packaging.
Return procedure for TPS54312QPWPREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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