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Texas Instruments TPS65268QRHBTQ1
- Part No.:
- TPS65268QRHBTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TPS65268QRHBTQ1.pdf
- Description:
- IC REG BCK ADJ 3A/2A TRPL 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:412
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Product details
Overview
TPS65268QRHBTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive triple synchronous buck converter delivering 3 A, 2 A, and 2 A output currents from a 4-V to 8-V input. It integrates three independent peak-current-mode controllers with 0.6-V ±1% feedback reference, adjustable 200 kHz–2.3 MHz switching frequency, and forced continuous conduction mode (FCCM) for low-output-ripple operation in automotive infotainment and ADAS power rails.
For engineers reviewing the TPS65268QRHBTQ1 datasheet, TPS65268QRHBTQ1 pinout, TPS65268QRHBTQ1 application, or TPS65268QRHBTQ1 equivalent, this device supports precise multi-rail sequencing via dedicated ENx/SSx pins, phase-shifted clocking (BUCK1 180° out-of-phase with BUCK2/BUCK3), and robust fault protection including overcurrent hiccup, thermal shutdown at 160°C, and PGOOD supervision across all outputs.
Technical Context
The TPS65268QRHBTQ1 implements constant-frequency peak-current-mode control with independent loop compensation (COMP1–COMP3), enabling stable regulation under dynamic load transients. Each buck channel features dedicated soft-start (SSx), enable (ENx), and Kelvin-sense feedback (FBx) pins for accurate voltage regulation and monotonic startup into prebiased loads.
Its internal PLL synchronizes switching to an external clock via ROSC, while phase interleaving between BUCK1 and BUCK2/BUCK3 reduces input ripple and eases filtering requirements. The integrated V7V LDO (4.96–6.3 V output) powers gate drivers and internal circuitry, eliminating need for external bias supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 8 V - Supports 5-V and 7-V automotive battery rails with 3.5-V UVLO rising threshold. |
| Output Currents | 3 A (BUCK1), 2 A (BUCK2), 2 A (BUCK3) - Enables simultaneous powering of CPU core, memory, and I/O rails. |
| Feedback Reference | 0.6 V ±1% - Enables precise 1.2-V, 1.5-V, and 2.5-V outputs using standard resistor dividers. |
| Switching Frequency | 200 kHz to 2.3 MHz - Adjustable via ROSC-to-ground resistor; supports EMI optimization and small external inductors. |
| Thermal Protection | 160°C trip with 20°C hysteresis - Ensures safe shutdown and automatic recovery during sustained overload or poor heatsinking. |
| PGOOD Function | Asserts high only when all three outputs are within ±5% of target - Provides system-level power-good sequencing signal. |
| Quiescent Current | 550–1150 µA (active, no switching) - Minimizes standby power in always-on automotive modules. |
Pinout & Package
RHB package: 32-pin VQFN (5.0 mm × 5.0 mm) with exposed thermal pad requiring PCB soldering for optimal thermal performance (RθJB = 7.4°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2, EN3 | Dedicated enable inputs | Float to enable; support external UVLO adjustment via resistor divider - enables rail-specific power sequencing. |
| SS1, SS2, SS3 | Soft-start/tracking inputs | Internal 5.2-µA current source - capacitor-based soft-start time control prevents inrush current and enables voltage tracking. |
| FB1, FB2, FB3 | Kelvin-sense feedback inputs | High-impedance inputs referenced to 0.6 V - minimize PCB trace IR drop errors for tight output regulation. |
| LX1, LX2, LX3 | Switching node outputs | Connect to external inductors and bootstrap capacitors - voltage swing ranges from diode-drop below GND to PVINx. |
| BST1, BST2, BST3 | Bootstrap supply outputs | Drive high-side MOSFET gates - require 47-nF capacitor to respective LX pin for proper gate drive voltage generation. |
| PGOOD | Power-good indicator | Open-drain output asserted high only when all three outputs meet regulation criteria - used for system reset or enable chaining. |
| ROSC | Oscillator frequency control | Resistor-to-ground sets switching frequency; accepts external clock for synchronization - critical for EMI reduction in multi-converter systems. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent buck controllers | Each with dedicated EN/SS/COMP/FB pins - enables flexible sequencing, independent loop tuning, and fault isolation per rail. |
| Phase-shifted switching | BUCK1 180° out-of-phase with BUCK2/BUCK3 - cuts RMS input ripple by ~30%, reducing input capacitor size and EMI filter complexity. |
| Forced Continuous Conduction Mode (FCCM) | Maintains CCM at light loads - eliminates audible noise and improves transient response vs. DCM operation. |
| V7V internal LDO | 4.96–6.3 V output, 185-mA current limit - powers gate drivers and internal logic without external bias supply. |
| Comprehensive protection suite | Overcurrent hiccup (256-cycle wait, 8192-cycle restart), thermal shutdown (160°C), overvoltage lockout (107.5% VREF) - ensures robust operation in harsh automotive environments. |
Applications
| Automotive Infotainment System | ADAS Camera Module Power |
|---|---|
Use Scenario: Powers SoC, DDR memory, and display interface in head-unit or digital cluster. IC Role / Device Role / Timing Role: Triple-buck regulator providing 1.2-V core, 1.5-V memory, and 2.5-V I/O rails with synchronized startup and PGOOD coordination. Use Value: Phase interleaving reduces input ripple, easing compliance with CISPR-25 Class 5 conducted emissions limits. |
Use Scenario: Supplies image sensor, ISP, and SerDes in rear-view or surround-view camera ECU. IC Role / Device Role / Timing Role: Delivers tightly regulated, low-noise 1.2-V and 2.5-V rails with FCCM operation to prevent switching-frequency-induced image artifacts. Use Value: Monotonic startup into prebiased loads avoids sensor latch-up during hot-plug events in vehicle wake-up sequences. |
| Automotive Telematics Control Unit | Car Audio DSP Power |
Use Scenario: Powers LTE modem, GNSS receiver, and microcontroller in connected vehicle gateway. IC Role / Device Role / Timing Role: Generates 3.3-V, 1.8-V, and 1.2-V rails with independent EN control for selective subsystem wake-up and low-quiescent-power sleep states. Use Value: 550–1150 µA quiescent current enables <100-µA system standby when all rails are disabled via EN pins. |
Use Scenario: Supplies high-performance audio DSP and codec in premium sound system amplifier module. IC Role / Device Role / Timing Role: Provides ultra-low-noise 1.2-V core and 3.3-V analog rails with Kelvin-sense feedback and dedicated COMP pins for optimal PSRR. Use Value: Integrated V7V LDO eliminates need for external bias supply, reducing BOM count and layout area in space-constrained amplifier PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65267RHBR | Non-automotive grade (industrial temp range –40°C to 105°C); identical pinout and electrical specs except AEC-Q100 qualification and thermal shutdown at 150°C vs 160°C. | Lacks AEC-Q100 Grade 1 certification and automotive qualification testing - unsuitable for safety-critical or production automotive use. | Select only for cost-sensitive industrial or prototyping applications where automotive qualification is not required. |
| MPQ4482GR-AEC1 | Triple 3-A/2-A/2-A buck with AEC-Q100 Grade 1, but uses voltage-mode control (vs peak-current-mode), fixed 500-kHz frequency, and no ROSC sync capability. | No external frequency adjustment or clock synchronization - limits EMI optimization flexibility in complex multi-rail systems. | Choose when simpler design flow and lower BOM cost outweigh need for programmable frequency and phase control. |
Compared with TPS65268QRHBTQ1, TPS65267RHBR omits automotive qualification and thermal margin, while MPQ4482GR-AEC1 trades programmable frequency and peak-current control for simplified voltage-mode architecture - making TPS65268QRHBTQ1 the preferred choice for EMI-sensitive, phase-coordinated automotive power systems requiring full AEC-Q100 compliance.
Availability
TPS65268QRHBTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, telematics control units, and car audio DSP power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for TPS65268QRHBTQ1 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 and embedded processing technologies, with decades of automotive-grade power management innovation.
The TPS65268-Q1 product line delivers highly integrated, AEC-Q100-qualified multi-rail DC/DC solutions targeting next-generation automotive electronics requiring compact, efficient, and robust power conversion.
FAQ
What is the operating junction temperature range for the TPS65268QRHBTQ1?
The TPS65268QRHBTQ1 is qualified for automotive Grade 1 operation with a guaranteed junction temperature range of –40°C to +125°C. Its thermal shutdown trips at 160°C with 20°C hysteresis, and the RθJB of 7.4°C/W enables reliable thermal performance when the exposed thermal pad is properly soldered to the PCB ground plane.
How does the TPS65268QRHBTQ1 support power sequencing in multi-rail systems?
The TPS65268QRHBTQ1 supports precise power sequencing through three independent enable (EN1/EN2/EN3) and soft-start (SS1/SS2/SS3) pins. Each EN pin has an internal 3.9-µA pullup, allowing floating to enable, or external resistor dividers to set custom UVLO thresholds. Capacitor-based soft-start on each SS pin controls ramp rate independently, enabling staggered or tracked startup across rails.
Can the TPS65268QRHBTQ1 synchronize its switching frequency to an external clock?
Yes, the TPS65268QRHBTQ1 supports external clock synchronization via the ROSC pin. When an external clock signal (200 kHz–2.3 MHz, 2-V high/0.4-V low thresholds) is applied to ROSC, the internal PLL locks to its falling edge, enabling deterministic phase alignment across multiple TPS65268QRHBTQ1 devices or with other system clocks to reduce beat frequencies and EMI peaks.
What protection features are integrated into the TPS65268QRHBTQ1?
The TPS65268QRHBTQ1 integrates overcurrent protection (hiccup mode with 256-cycle wait and 8192-cycle restart), thermal shutdown (160°C trip), overvoltage lockout (107.5% of 0.6-V reference), and bootstrap UVLO monitoring. It also features PGOOD supervision with hysteresis and dedicated fault reporting via the open-drain PGOOD pin, ensuring safe operation in demanding automotive environments.
Is the TPS65268QRHBTQ1 pin-compatible with any non-automotive variants?
Yes, the TPS65268QRHBTQ1 shares identical pinout, package (RHB VQFN-32), and electrical specifications with the industrial-grade TPS65268RHB, except for AEC-Q100 qualification, extended temperature validation, and enhanced ESD ratings (HBM ±2000 V, CDM ±750 V on corner pins). This allows direct hardware reuse in non-automotive prototypes or industrial designs.
TPS65268QRHBTQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-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):
- 4V
- Voltage - Input (Max):
- 8V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A, 2A
- Frequency - Switching:
- 200kHz ~ 2.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TPS65268QRHBTQ1 FAQ
1.How can I place an order for TPS65268QRHBTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65268QRHBTQ1 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 TPS65268QRHBTQ1 reliable?
The price and inventory of TPS65268QRHBTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65268QRHBTQ1 is usually 5 days.
3.What payment methods are accepted for TPS65268QRHBTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65268QRHBTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65268QRHBTQ1?
TPS65268QRHBTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65268QRHBTQ1 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 TPS65268QRHBTQ1?
For technical support, including TPS65268QRHBTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65268QRHBTQ1 requirements.
6.How does Aetrix verify that TPS65268QRHBTQ1 is sourced from the original manufacturer or authorized distributors?
All TPS65268QRHBTQ1 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 TPS65268QRHBTQ1 meets industry standards.
7.What is the process for return or replacement of TPS65268QRHBTQ1?
All TPS65268QRHBTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS65268QRHBTQ1, 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 TPS65268QRHBTQ1 part is unused and in its original packaging.
Return procedure for TPS65268QRHBTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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