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Texas Instruments TPS54356MPWPREP
- Part No.:
- TPS54356MPWPREP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54356MPWPREP.pdf
- Description:
- IC REG BUCK 3.3V 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
TPS54356MPWPREP from Texas Instruments is a radiation-hardened, 3-A synchronous buck PWM converter with integrated high-side MOSFET and external low-side gate driver (LSG), designed for point-of-load regulation in defense, aerospace, and medical systems. It delivers fixed 3.3 V output from 4.5–20 V input, operates at 500 kHz (RT pin floating), achieves >95% peak efficiency at 3.3 V/3 A, and includes power-good (PWRGD), synchronization (SYNC), and undervoltage lockout (UVLO) functions.
For engineers reviewing the TPS54356MPWPREP datasheet, TPS54356MPWPREP pinout, TPS54356MPWPREP application, or TPS54356MPWPREP equivalent, key selection considerations include its 16-pin HTSSOP PowerPAD™ package, 3.3 V ±1% output accuracy over load/temperature, 180° out-of-phase SYNC capability, internal slow-start (2.9 ms), and thermal shutdown at 165°C - all validated for –55°C to 125°C operation.
Technical Context
The TPS54356MPWPREP implements a feed-forward modulator with constant gain (Km = 8) and adaptive dead-time control to prevent shoot-through between high- and low-side FETs. Its voltage-mode PWM architecture uses an internal 0.891-V reference, error amplifier with 2-MHz unity-gain bandwidth, and 1.5-mA drive capability.
It supports dual-mode synchronization: SYNC acts as output (falling-edge, 180° out-of-phase with PH) when RT is floating or grounded, or as falling-edge-triggered input when RT is resistor-set. UVLO thresholds are programmable via external divider (default start: 4.49 V, stop: 3.69 V), and current limiting triggers hiccup mode (4.5 ms off-time) at 3.3–6.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% (3.234–3.366 V) across 100 mA–3 A load and –55°C to 125°C |
| Input Voltage Range | 4.5 V to 20 V - supports 12-V and 5-V intermediate bus architectures |
| Switching Frequency | 500 kHz (RT pin floating) - enables compact magnetics and low output ripple |
| Continuous Output Current | 3 A - sustained with thermal management via PowerPAD™ package |
| Efficiency | ≥95% at 12 VIN/3.3 VOUT/3 A - minimizes thermal load in enclosed systems |
| Thermal Shutdown | 165°C trip point with 7°C hysteresis - protects against sustained overload or airflow loss |
| Power-Good Threshold | 97% of nominal output (3.201 V rising) with 2-ms delay at 500 kHz - ensures stable rail sequencing |
Pinout & Package
The TPS54356MPWPREP is housed in a thermally enhanced 16-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad requiring solder connection to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 VIN | Input supply | Bypassed by ≥10-µF ceramic capacitor; supplies high-side FET and bias regulator |
| 3 UVLO | Undervoltage lockout adjust | External resistor divider overrides default 4.49-V start threshold |
| 4 PWRGD | Open-drain power-good indicator | Pulled low during fault (UVLO, OCP, thermal, slow-start); requires external pullup |
| 5 RT | Frequency setting | Floating → 500 kHz; grounded → 250 kHz; resistor-set → 250–700 kHz |
| 6 SYNC | Bidirectional sync I/O | Output (180° out-of-phase) when RT floating; falling-edge input when RT resistor-set |
| 7 ENA | Enable control | Logic-high (>2 V) enables; <0.5 V disables and resets slow-start |
| 8 COMP | Error amplifier output | Connect compensation network (R-C-Z) between COMP and VSENSE per design |
| 9 BOOT | High-side gate driver bootstrap | 0.1-µF ceramic cap required between BOOT and PH for gate drive integrity |
| 10, 11 PGND | Power ground return | Carries high di/dt switching currents; must connect to PowerPAD™ and AGND |
| 12 VBIAS | Internal 8-V bias supply | Provides gate drive and analog circuitry power; requires 1-µF bypass capacitor |
| 13 LSG | Low-side gate driver output | Drives external n-channel MOSFET gate; 5-Ω typical ON resistance |
| 14, 15 PH | Phase node | Connects to output inductor; carries full switching current and voltage swing |
| 16 AGND | Analog ground reference | Internally isolated sensitive node; tie to PGND and PowerPAD™ at single point |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ high-side MOSFET | Enables 3-A continuous output without external high-side switch, reducing BOM count and layout area |
| 180° out-of-phase synchronization | Reduces RMS input ripple current by √2 when two units operate interleaved, lowering input capacitance requirements |
| Internally compensated error amplifier | Eliminates need for external compensation components in standard configurations, accelerating design cycle |
| Adjustable undervoltage lockout | Allows system-level brownout protection tuning via external resistor divider on UVLO pin |
| Controlled baseline and extended lifecycle | Meets defense/aerospace traceability, single-fab sourcing, and long-term availability requirements |
Applications
| Defense Radar Power Supply | Aerospace Avionics DC-DC |
|---|---|
Use Scenario: Point-of-load regulation for FPGA-based signal processors in airborne radar transceivers requiring stable 3.3-V supply under vibration, temperature extremes, and EMI. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering regulated 3.3 V from 28-V aircraft bus; provides PWRGD for FPGA configuration sequencing. Use Value: Radiation-tolerant design and –55°C to 125°C operation ensure reliability in mission-critical flight systems; 500-kHz switching enables compact filter design. | Use Scenario: Powering high-speed ADCs and DACs in satellite payload telemetry modules where input voltage varies from 12 V to 20 V due to solar array fluctuations. IC Role / Device Role / Timing Role: Fixed-output buck regulator with SYNC input synchronized to system clock to minimize spectral noise coupling into analog signal chains. Use Value: 180° SYNC capability allows interleaving with other rails to suppress input ripple harmonics; tight 3.3-V tolerance maintains ADC reference stability. |
| Medical Imaging Sensor Interface | Industrial Control FPGA Core Rail |
Use Scenario: Providing clean, sequenced 3.3-V power to CMOS image sensor interfaces in portable ultrasound devices with battery + adapter input. IC Role / Device Role / Timing Role: Main DC-DC converter with ENA-controlled soft-start and PWRGD feedback to microcontroller for safe sensor initialization. Use Value: Internal slow-start (2.9 ms) prevents inrush-induced voltage droop on shared battery rail; UVLO adjustment avoids premature shutdown during battery sag. | Use Scenario: Generating core voltage for Xilinx Spartan-7 FPGA in ruggedized PLC backplane where ambient temperature exceeds 85°C. IC Role / Device Role / Timing Role: High-efficiency buck regulator mounted directly on FPGA carrier board; PowerPAD™ thermal pad soldered to 2-oz copper pour for conduction cooling. Use Value: 95%+ efficiency at full load reduces localized heating; thermal shutdown (165°C) and hiccup-mode OCP protect against sustained overloads in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54356PWPR | Commercial-grade version (–40°C to 125°C), same pinout and electrical specs, no EP suffix or controlled baseline | Lacks radiation tolerance, extended temp range, and defense lifecycle support | Select for cost-sensitive industrial or commercial designs where MIL-STD-883 compliance is not required |
| LMZ12003TZE/NOPB | 3-A SIMPLE SWITCHER® module with integrated inductor; 4.5–20 V input, 3.3 V fixed output; larger footprint, lower efficiency (~92%) | Reduces design time but sacrifices layout flexibility and thermal performance vs. discrete solution | Choose when rapid prototyping or space-constrained layouts outweigh efficiency and thermal optimization needs |
Compared with TPS54356PWPR, the TPS54356MPWPREP adds radiation hardening, extended temperature range, and controlled baseline - critical for defense/aerospace deployment. Versus LMZ12003TZE/NOPB, it offers higher efficiency, better thermal dissipation via PowerPAD™, and full external component control for precision filtering and transient response tuning.
Availability
TPS54356MPWPREP is available at Aetrix Electronics and suitable for defense radar power supplies, aerospace avionics DC-DC conversion, and medical imaging sensor interfaces requiring stable component supply under extended temperature and long-lifecycle conditions.
Supply support for TPS54356MPWPREP 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 power management solutions.
The TPS5435x-EP family was engineered for high-reliability point-of-load regulation in defense, aerospace, and medical electronics - emphasizing radiation tolerance, extended temperature operation, and controlled manufacturing baselines.
FAQ
What is the guaranteed output voltage accuracy of the TPS54356MPWPREP over temperature and load?
The TPS54356MPWPREP delivers 3.3 V output with ±1% tolerance (3.234 V to 3.366 V) across the full operating range of –55°C to 125°C junction temperature and 100 mA to 3 A output current, as specified in the Electrical Characteristics table under TJ = 25°C and VIN = 5.5 V to 20 V conditions. This accuracy is maintained by trimming the internal 0.891-V reference and error amplifier offset during production test.
How does the TPS54356MPWPREP implement synchronization, and what is the phase relationship?
The TPS54356MPWPREP implements bidirectional synchronization via the SYNC pin: when RT is floating, SYNC outputs a falling-edge signal that is 180° out-of-phase with the rising edge of the PH pin. When RT is resistor-connected, SYNC becomes a falling-edge-triggered input. This 180° relationship enables interleaved operation of two TPS54356MPWPREP units to halve input ripple current and reduce required input capacitance.
What thermal management features does the TPS54356MPWPREP include, and how is overheating handled?
The TPS54356MPWPREP includes thermal shutdown at 165°C with 7°C hysteresis and current-limit hiccup mode (4.5 ms off-time) triggered at 3.3–6.5 A. Its 16-pin HTSSOP PowerPAD™ package requires soldering the exposed thermal pad to a PCB ground plane for effective conduction cooling. The device also features adaptive dead-time control to minimize shoot-through losses and improve thermal efficiency during switching transitions.
Can the TPS54356MPWPREP operate without an external low-side MOSFET, and what is the impact?
Yes, the TPS54356MPWPREP can operate without an external low-side MOSFET by leaving the LSG pin open and connecting a Schottky diode from PGND to PH. In this diode-based configuration, efficiency drops due to forward voltage drop (typically 1.08–1.38 V at 100 mA), especially at light loads. Using an external MOSFET driven by LSG improves efficiency by replacing diode conduction loss with low RDS(on) loss, enabling full 3-A capability with minimal thermal rise.
What is the purpose and behavior of the PWRGD pin on the TPS54356MPWPREP during startup and fault conditions?
The PWRGD pin on the TPS54356MPWPREP is an open-drain output indicating valid regulation: it presents high impedance when VSENSE reaches ≥97% of nominal output (3.201 V) and remains stable for ≥2 ms (at 500 kHz). During startup, slow-start delays PWRGD assertion until regulation is established. It pulls low during faults including UVLO, overcurrent, thermal shutdown, VSENSE out-of-bounds, or low VBIAS - even if the device is unpowered, due to a weak internal pulldown.
TPS54356MPWPREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™
- Package/Case:
- 16-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):
- 4.5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 250kHz, 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS54356MPWPREP FAQ
1.How can I place an order for TPS54356MPWPREP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54356MPWPREP 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 TPS54356MPWPREP reliable?
The price and inventory of TPS54356MPWPREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54356MPWPREP is usually 5 days.
3.What payment methods are accepted for TPS54356MPWPREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54356MPWPREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54356MPWPREP?
TPS54356MPWPREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54356MPWPREP 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 TPS54356MPWPREP?
For technical support, including TPS54356MPWPREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54356MPWPREP requirements.
6.How does Aetrix verify that TPS54356MPWPREP is sourced from the original manufacturer or authorized distributors?
All TPS54356MPWPREP 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 TPS54356MPWPREP meets industry standards.
7.What is the process for return or replacement of TPS54356MPWPREP?
All TPS54356MPWPREP units undergo pre-shipment inspection (PSI). If there is an issue with TPS54356MPWPREP, 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 TPS54356MPWPREP part is unused and in its original packaging.
Return procedure for TPS54356MPWPREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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