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Texas Instruments TPS54357PWPR
- Part No.:
- TPS54357PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54357PWPR.pdf
- Description:
- IC REG BUCK 5V 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
TPS54357PWPR from Texas Instruments is a 5.0-V fixed-output synchronous buck PWM converter with integrated 100-mΩ high-side MOSFET, supporting 3-A continuous output current at up to 700 kHz switching frequency, internal slow-start (2.7 ms at 500 kHz), adjustable UVLO (6.65 V start), and 180° out-of-phase synchronization capability - used in point-of-load regulation for FPGAs and microprocessors.
For engineers reviewing the TPS54357PWPR datasheet, TPS54357PWPR pinout, TPS54357PWPR application, or TPS54357PWPR equivalent, key selection criteria include input voltage range (6.65–20 V), thermal shutdown trip point (165°C), PWRGD open-drain power-good signaling, external low-side MOSFET drive via LSG pin, and PowerPAD-enhanced thermal performance in 16-pin TSSOP.
Technical Context
The TPS54357PWPR implements feed-forward PWM modulation with constant modulator gain (8 V/V) independent of switching frequency, adaptive dead-time control to prevent shoot-through, and a true voltage error amplifier (60 dB open-loop gain, 2 MHz unity-gain bandwidth). Its internal oscillator runs at twice the PWM frequency and supports RT-resistor programming (250–700 kHz) or external synchronization via falling-edge-triggered SYNC pin.
It integrates undervoltage lockout with factory-set thresholds (6.65 V start / 5.45 V stop), thermal shutdown with 7°C hysteresis, peak-current limiting (4.5 A typ), and a dedicated 8.0-V VBIAS rail for analog circuitry and gate drive - all operating across −40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1% (4.90–5.10 V over load/temperature) |
| Input Voltage Range | 6.65 V to 20 V - ensures stable operation above UVLO stop threshold (5.45 V) and avoids dropout in industrial 12-V systems |
| Continuous Output Current | 3 A - supported by 100-mΩ high-side MOSFET and thermal design with PowerPAD package |
| Switching Frequency | Adjustable 250–700 kHz - set via RT resistor; enables optimization of size (higher fs) vs. efficiency (lower fs) |
| Thermal Shutdown | 165°C trip point with 7°C hysteresis - protects against sustained overload or poor PCB thermal layout |
| Power Good (PWRGD) | Open-drain output asserting low when VSENSE < 97% of target - provides system-level fault detection with rising-edge delay (2 ms at 500 kHz) |
| UVLO Threshold | 6.65 V start / 5.45 V stop - prevents premature startup during brownout; externally adjustable via resistive divider |
Pinout & Package
TPS54357PWPR uses a thermally enhanced 16-pin HTSSOP (PWP) PowerPAD package with exposed thermal pad soldered to PGND/AGND plane for low θJA (42.1°C/W with soldered pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Input supply connection | Bypassed with 10-µF ceramic capacitor; supports 6.65–20 V input with internal UVLO enforcement |
| UVLO (Pin 3) | Undervoltage lockout control | Accepts external resistor divider to override default 6.65 V start threshold |
| PWRGD (Pin 4) | Power-good status indicator | Open-drain output pulled low on fault (VSENSE out-of-range, overcurrent, thermal shutdown, etc.) |
| RT (Pin 5) | Frequency setting input | Resistor-to-AGND sets fSW = 46000/(RRT + 35.9) kHz; floating = 500 kHz, grounded = 250 kHz |
| SYNC (Pin 6) | Bidirectional sync I/O | Output mode (RT floating/grounded): falling edge 180° out-of-phase with PH; input mode (RT resistor): falling-edge triggered sync |
| ENA (Pin 7) | Enable/disable control | Logic-high enables; <0.5 V disables and resets slow-start; internal 5-µA pullup eliminates need for external resistor |
| COMP (Pin 8) | Error amplifier output | Internal node - no external connection permitted per datasheet |
| VSENSE (Pin 9) | Feedback input | Inverting input of error amp; compares output voltage to 0.891-V internal reference |
| AGND (Pin 10) | Analog ground reference | Internally connected to sensitive analog circuitry; must be tied to PGND and PowerPAD |
| PGND (Pin 11) | Power ground return | Carries high di/dt currents from LSG driver; requires low-inductance connection to PowerPAD |
| VBIAS (Pin 12) | Bias voltage supply | Stable 7.5–8.0 V output (1 mA max); requires 1.0-µF X7R/X5R ceramic bypass |
| LSG (Pin 13) | Low-side gate driver output | 100-mA sink/source driver for external n-channel MOSFET; enables synchronous rectification |
| PH (Pins 14,15) | Phase node connection | Connects to LC filter inductor; carries high-frequency switching current; BOOT capacitor ties here |
| BOOT (Pin 16) | High-side gate bootstrap | 0.1-µF ceramic capacitor required between BOOT and PH to sustain high-side FET gate drive |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ high-side MOSFET | Enables >90% efficiency at 3 A (e.g., 95% at 3 A, 12 VIN, 5 VOUT, 500 kHz) without external high-side switch |
| 180° out-of-phase synchronization | Reduces RMS input ripple current by ~30% in dual-converter designs, lowering required input capacitance |
| Internally compensated control loop | Eliminates need for external compensation components - simplifies design and reduces BOM count |
| Adaptive dead-time control | Prevents shoot-through by dynamically delaying high/low-side turn-on until opposite FET gate voltage falls below 1 V |
| Programmable UVLO with hysteresis | 600-mV hysteresis prevents oscillation during input voltage recovery; external divider allows custom thresholds |
Applications
| FPGA Point-of-Load Regulation | Industrial DSP Power Supply |
|---|---|
|
Use Scenario: Providing clean, tightly regulated 5.0 V to Xilinx or Intel FPGA core I/O banks requiring fast transient response and low output ripple. IC Role / Device Role / Timing Role: Primary DC-DC regulator delivering 3-A continuous current with PWRGD signaling to FPGA configuration logic. Use Value: Internal slow-start (2.7 ms at 500 kHz) prevents inrush-induced rail collapse; 100-mΩ MOSFET minimizes conduction loss under dynamic load steps. |
Use Scenario: Powering TI C6000 or Analog Devices SHARC DSPs in programmable logic controllers with strict thermal constraints. IC Role / Device Role / Timing Role: Synchronous buck controller managing 5.0 V rail with thermal shutdown (165°C) and current limit (4.5 A typ) for robust field operation. Use Value: PowerPAD package enables reliable 3-A operation at 85°C ambient; SYNC pin allows interleaving with auxiliary rails to reduce EMI. |
| Embedded Microprocessor Core Supply | Industrial LCD Panel Backlight Control |
|
Use Scenario: Generating 5.0 V for ARM Cortex-A/M series SoCs in medical imaging or test equipment where voltage accuracy and stability are critical. IC Role / Device Role / Timing Role: Fixed-output buck converter with 1% output tolerance and line/load regulation ≤±0.1% - ensuring consistent processor clocking and memory interface timing. Use Value: VSENSE feedback architecture achieves ±0.1% line regulation (4–20 V input) and ±0.08% load regulation (0–3 A), minimizing timing jitter. |
Use Scenario: Driving LED backlight strings in industrial HMIs and panel PCs requiring stable 5.0 V bias for LED driver ICs. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator feeding constant-current LED drivers; operates continuously at full load in sealed enclosures. Use Value: 95% peak efficiency at 3 A reduces thermal load in space-constrained displays; thermal shutdown prevents damage during extended operation. |
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 | Fixed 3.3-V output; identical pinout, package, and feature set except output voltage and UVLO thresholds (4.49 V start) | Used where 3.3-V rail is required instead of 5.0 V - e.g., PCIe endpoint logic or USB PHY supplies | Select TPS54356PWPR only when 3.3-V output is needed; not a drop-in replacement due to different UVLO and feedback network requirements |
| MP2359DJ-LF-Z | Monolithic 5-V buck (no external LSG driver); 2-A continuous rating; 500-kHz fixed frequency; smaller 8-pin SOIC package | Suitable for lower-current applications (<2 A) where board space is constrained and synchronous efficiency is still required | Choose MP2359DJ-LF-Z for cost-sensitive, space-limited designs needing ≤2 A; TPS54357PWPR remains preferred for 3-A loads and external MOSFET flexibility |
Compared with TPS54356PWPR, the TPS54357PWPR offers higher output voltage but shares identical thermal, synchronization, and protection features; versus MP2359DJ-LF-Z, it delivers 50% more current and supports external low-side FETs for optimized efficiency at full load.
Availability
TPS54357PWPR is available at Aetrix Electronics and suitable for FPGA point-of-load regulation, industrial DSP power supplies, and embedded microprocessor core supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS54357PWPR 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 power conversion ICs.
The TPS5435x family was designed specifically for medium-current, high-efficiency point-of-load applications in FPGA, DSP, ASIC, and microprocessor systems - emphasizing thermal robustness, synchronization, and simplified layout via integrated high-side FET and PowerPAD packaging.
FAQ
What is the minimum input voltage required for TPS54357PWPR to start switching?
The TPS54357PWPR has a factory-set undervoltage lockout (UVLO) start threshold of 6.65 V. It will not begin switching until the VIN pin reaches this voltage. The stop threshold is 5.45 V, providing 600 mV of hysteresis to prevent oscillation during brownout conditions. External resistor dividers can adjust these thresholds if needed.
Can TPS54357PWPR operate without an external low-side MOSFET?
Yes, the TPS54357PWPR can operate in asynchronous mode using only an external Schottky diode connected from PH to PGND. The LSG pin is left unconnected in this configuration. However, using an external low-side MOSFET driven by the LSG pin improves efficiency - especially at higher loads - by replacing diode conduction loss with lower RDS(on) loss.
How does the SYNC pin function in TPS54357PWPR when RT is left floating?
When the RT pin is floating, the TPS54357PWPR operates at its internally set 500 kHz switching frequency and configures the SYNC pin as an output. The SYNC signal is a falling-edge-triggered waveform that is approximately 180° out of phase with the rising edge of the PH pin - enabling interleaved operation with a second TPS5435x device to reduce input ripple current.
What thermal performance can be expected from TPS54357PWPR in a standard PCB layout?
With proper implementation - including soldering the PowerPAD to a 2-oz copper thermal plane with thermal vias - the TPS54357PWPR achieves a junction-to-ambient thermal impedance (θJA) of 42.1°C/W. At 3-A load and 12-V input, typical power dissipation is ~1.2 W, resulting in ~50°C junction rise above ambient - well within the 125°C maximum operating junction temperature.
Does TPS54357PWPR require external compensation components?
No, the TPS54357PWPR features an internally compensated control loop. Its error amplifier and PWM modulator are designed to provide stable operation with standard output LC filter components (e.g., 2.2 µH inductor, 2 × 22-µF ceramic capacitors) without requiring external compensation networks on the COMP pin - reducing design complexity and BOM count.
TPS54357PWPR 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):
- 6.65V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 250kHz, 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS54357PWPR FAQ
1.How can I place an order for TPS54357PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54357PWPR 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 TPS54357PWPR reliable?
The price and inventory of TPS54357PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54357PWPR is usually 5 days.
3.What payment methods are accepted for TPS54357PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54357PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54357PWPR?
TPS54357PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54357PWPR 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 TPS54357PWPR?
For technical support, including TPS54357PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54357PWPR requirements.
6.How does Aetrix verify that TPS54357PWPR is sourced from the original manufacturer or authorized distributors?
All TPS54357PWPR 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 TPS54357PWPR meets industry standards.
7.What is the process for return or replacement of TPS54357PWPR?
All TPS54357PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54357PWPR, 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 TPS54357PWPR part is unused and in its original packaging.
Return procedure for TPS54357PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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