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Texas Instruments TPS65257RHAT
- Part No.:
- TPS65257RHAT
- Manufacturer:
- Texas Instruments
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
TPS65257RHAT.pdf
- Description:
- IC REG BCK ADJ 3A/2A TRPL 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:322
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Product details
Overview
TPS65257RHAT from Texas Instruments is a 40-pin QFN power management IC integrating three synchronous step-down DC-DC converters (3 A / 2 A / 2 A), a 1-A USB power switch, push-button control, and power-good supervision. It operates from 4.5 V to 16 V input, delivers 0.8-V reference with 1% accuracy, supports pre-biased outputs, and enables intelligent system power sequencing in industrial and embedded applications.
For engineers reviewing the TPS65257RHAT datasheet, TPS65257RHAT pinout, TPS65257RHAT application, or TPS65257RHAT equivalent, key selection considerations include adjustable current limiting per buck channel, 300 kHz–2.2 MHz resistor-set switching frequency, hiccup-mode overcurrent protection, integrated FETs with confirmed RDS(on) values (95 mΩ HS / 50 mΩ LS for Buck1), and thermal shutdown at 160°C with 20°C hysteresis.
Technical Context
The TPS65257RHAT implements peak current-mode control with built-in slope compensation across all three buck regulators, enabling stable operation with simple Type II compensation networks and crossover frequencies exceeding 100 kHz. Each converter features independent enable, soft-start, and RLIM pins for sequenced startup, adjustable soft-start timing, and external current-limit tuning via resistor.
It integrates a dedicated 1-A USB switch with overcurrent and thermal protection (trip at 130°C), open-drain USB_nFAULT signaling, and a 10-kV ESD-rated PB_IN pin supporting programmable ON/OFF system management. The device uses phase-shifted 180° operation between converters to minimize input ripple and includes an internal V7V (6.25 V) and V3V (3.3 V) bias supply with UVLO thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 16 V - supports 5/9/12/15-V systems without external regulation |
| Buck1 Continuous Output Current | 3 A - verified continuous rating with integrated 95-mΩ high-side and 50-mΩ low-side MOSFETs |
| Buck2 & Buck3 Continuous Output Current | 2 A each - confirmed per-channel capability with integrated 120-mΩ/80-mΩ FET pairs |
| Feedback Reference Voltage | 0.8 V ±1% - enables precise output setting down to 0.8 V using external resistor divider |
| Switching Frequency Range | 300 kHz to 2.2 MHz - set externally via ROSC pin resistor; allows optimization of size vs. efficiency |
| Operating Junction Temperature | –40°C to 125°C - validated for industrial ambient environments with thermal shutdown at 160°C |
| USB Switch Current Limit | 1.2 A ±20% - adjustable overcurrent threshold with fault flag and thermal protection |
Pinout & Package
TPS65257RHAT is housed in a thermally efficient 40-pin QFN package (6 mm × 6 mm, RHA suffix), with exposed PowerPAD connected to system ground for electrical integrity and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2, EN3 | Individual buck enable inputs | High-active logic; supports delayed start-up via RC network on each pin |
| FB1, FB2, FB3 | Feedback inputs | Connect to resistor divider to set output voltage to 0.8 V reference |
| SS1, SS2, SS3 | Soft-start inputs | Accept ceramic capacitor to control ramp time and inrush current |
| RLIM1, RLIM2, RLIM3 | Current limit programming | Resistor-to-ground sets peak inductor current (e.g., 1.2–5.05 A for Buck1) |
| ROSC | Oscillator frequency set | External resistor selects switching frequency from 300 kHz to 2.2 MHz |
| PGOOD | Power-good status | Open-drain output asserted high when all buck outputs are ≥90% of nominal |
| PB_IN | Push-button interface | 10-kV HBM ESD-rated input for system ON/OFF control with 20-ms debounce |
| USB_EN / USB_nFAULT | USB switch control/status | Enable high turns on 1-A switch; nFAULT pulls low on overcurrent or thermal fault |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | Eliminates need for external high/low-side MOSFETs; reduces BOM count and layout area |
| Automatic PFM/PWM mode | Maintains <2% output ripple during light-load operation while improving standby efficiency |
| Hiccup-mode overcurrent protection | Shuts down affected converter for 10 ms after >10-ms overload, then retries-prevents latch-up |
| Phase-shifted buck operation | 180° interleaving between channels minimizes input capacitor RMS current and filter size |
| Dedicated USB power switch | Provides regulated 1-A USB port with independent overcurrent, thermal, and fault signaling |
Applications
| Industrial PLC I/O Module | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Powering multiple voltage rails (1.2 V core, 1.8 V memory, 3.3 V peripherals) from a 12-V vehicle battery or 24-V industrial bus. IC Role / Device Role / Timing Role: Central PMIC managing rail sequencing, USB host power, and system-level power-on/off via push button. Use Value: Single-chip solution eliminates discrete DC-DCs and USB switches, reducing board space by >40% versus discrete alternatives. | Use Scenario: Supplying processor core, DDR memory, and display interface in a head unit with cold-cranking tolerance (down to 4.5 V). IC Role / Device Role / Timing Role: Primary power controller delivering tightly regulated outputs with hiccup-mode fault recovery during load dump transients. Use Value: Confirmed –40°C to 125°C operation and 160°C thermal shutdown ensure reliability under hood temperature extremes. |
| Network Edge Router | Medical Diagnostic Imaging Controller |
Use Scenario: Generating isolated 1.2 V, 1.8 V, and 3.3 V supplies for FPGA, PHY, and management MCU in compact 1U chassis. IC Role / Device Role / Timing Role: High-efficiency triple-buck regulator with programmable soft-start and PGOOD coordination for FPGA configuration sequencing. Use Value: Adjustable current limits and ROSC-based frequency tuning allow optimization for low-noise or high-density layouts. | Use Scenario: Powering real-time imaging processors and sensor interfaces requiring low-noise, pre-biased startup, and fail-safe reset signaling. IC Role / Device Role / Timing Role: Safety-critical PMIC providing PGOOD assertion only when all rails are within ±10% window and generating clean reset pulse. Use Value: Verified 1% reference accuracy and 85%/90% PGOOD thresholds meet IEC 62304 Class C power integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65217CZQQ1 | Automotive-qualified AEC-Q100 Grade 2 (–40°C to 105°C); integrates LDOs but lacks USB switch | Targeted for automotive infotainment with stricter qualification; no USB port support | Select when automotive qualification and LDO integration outweigh need for USB functionality |
| TPS65261RHBR | Triple-buck with 3-A/2-A/2-A ratings but no integrated USB switch or push-button logic | Requires external USB switch and GPIO-based power sequencing circuitry | Select when USB and PB_IN features are unnecessary and lower cost is prioritized |
Compared with TPS65257RHAT, TPS65217CZQQ1 adds automotive qualification and LDOs but removes USB functionality, while TPS65261RHBR reduces feature count to lower cost but increases system-level component count and design complexity for USB and power-button implementation.
Availability
TPS65257RHAT is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, and network edge routers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS65257RHAT 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 over 50 years of innovation in high-reliability power solutions.
The TPS65257 product line was designed specifically for space-constrained industrial and automotive applications requiring integrated multi-rail conversion, USB power delivery, and intelligent system-level power control-all in a single QFN package.
FAQ
What is the maximum continuous output current supported by each buck regulator in the TPS65257RHAT?
The TPS65257RHAT supports 3 A continuous output current on Buck1 and 2 A continuous on both Buck2 and Buck3. These ratings are validated with integrated MOSFETs (95 mΩ HS / 50 mΩ LS for Buck1; 120 mΩ / 80 mΩ for Buck2/Buck3) and specified over the full –40°C to 125°C junction temperature range. Peak currents reach 3.5 A (Buck1) and 2.5 A (Buck2/Buck3) under transient conditions.
How does the TPS65257RHAT implement overcurrent protection, and what happens during a fault?
The TPS65257RHAT uses hiccup-mode overcurrent protection: if any buck converter senses overcurrent lasting longer than 10 ms, it shuts down for 10 ms and then attempts restart. If the fault persists, the cycle repeats until cleared. For sub-10-ms events, only the affected channel shuts down. The USB switch independently asserts USB_nFAULT low and enters constant-current mode during overcurrent or thermal faults above 130°C.
Can the TPS65257RHAT support pre-biased output startup, and why is this important?
Yes, the TPS65257RHAT explicitly supports pre-biased outputs-a critical feature for systems where downstream loads retain residual voltage during power cycling. This prevents reverse current flow into the converter during startup, avoiding potential damage to FETs or load circuitry. The device's current-mode architecture and internal control logic ensure safe ramp-up even when output capacitors are initially charged.
What is the role of the ROSC pin in the TPS65257RHAT, and how is switching frequency set?
The ROSC pin sets the TPS65257RHAT's switching frequency by connecting an external resistor to ground. The relationship is defined by fSW = 174 / ROS1.122 (ROS in kΩ, fSW in MHz), enabling precise selection from 300 kHz to 2.2 MHz. This resistor-based method avoids clock jitter from external sources and allows optimization of efficiency, EMI, and inductor/capacitor size per application requirement.
Does the TPS65257RHAT include thermal protection, and what are the trip and recovery thresholds?
Yes, the TPS65257RHAT includes two thermal protections: one for the main IC (trip at 160°C, recovery at 140°C, 20°C hysteresis) and one for the USB switch (trip at 130°C, recovery at 110°C). Both are hardware-based and independent-USB thermal fault disables only the USB switch while allowing buck converters to remain operational, ensuring system-level power continuity.
TPS65257RHAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 3A, 2A
- Frequency - Switching:
- 300kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VQFN (6x6)
TPS65257RHAT FAQ
1.How can I place an order for TPS65257RHAT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65257RHAT 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 TPS65257RHAT reliable?
The price and inventory of TPS65257RHAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65257RHAT is usually 5 days.
3.What payment methods are accepted for TPS65257RHAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65257RHAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65257RHAT?
TPS65257RHAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65257RHAT 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 TPS65257RHAT?
For technical support, including TPS65257RHAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65257RHAT requirements.
6.How does Aetrix verify that TPS65257RHAT is sourced from the original manufacturer or authorized distributors?
All TPS65257RHAT 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 TPS65257RHAT meets industry standards.
7.What is the process for return or replacement of TPS65257RHAT?
All TPS65257RHAT units undergo pre-shipment inspection (PSI). If there is an issue with TPS65257RHAT, 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 TPS65257RHAT part is unused and in its original packaging.
Return procedure for TPS65257RHAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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