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Texas Instruments TPS65266-1RHBR
- Part No.:
- TPS65266-1RHBR
- Manufacturer:
- Texas Instruments
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TPS65266-1RHBR.pdf
- Description:
- IC REG BUCK ADJ TRPL 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,448
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Product details
Overview
TPS65266-1 from Texas Instruments is a triple-channel synchronous step-down DC/DC converter with 3-A/2-A/2-A continuous output current capability, 0.6-V feedback reference voltage (±1%), adjustable 250 kHz–2.4 MHz switching frequency, and integrated power MOSFETs for high-efficiency operation across 2.7–6-V input range. It delivers regulated 1.0-V, 1.5-V, and 1.8-V outputs for multi-rail power systems in compact embedded applications.
For engineers reviewing the TPS65266-1 datasheet, TPS65266-1 pinout, TPS65266-1 application, or TPS65266-1 equivalent, this device supports precise power sequencing via dedicated ENx/SSx pins, pulse-skipping mode (PSM) at light load, cycle-by-cycle overcurrent protection with hiccup mode, and thermal shutdown at 160°C - critical for reliable printer, set-top box, and surveillance system designs.
Technical Context
The TPS65266-1 implements peak-current-mode control with independent compensation per channel (COMP1/2/3), enabling fast transient response and simplified loop design. Its 180° phase-shifted clocking between Buck1 and Buck2/Buck3 reduces input ripple and eases input capacitor selection.
Buck1 operates at up to 3 A with 45-mΩ high-side RDS(on), while Buck2 and Buck3 each support 2 A with 60-mΩ high-side RDS(on). Each channel features dedicated soft-start (5.5-µA internal pullup), enable with UVLO hysteresis, and Kelvin-sense FB pins for accurate regulation under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 6 V - supports single-cell Li-ion, USB PD, and 5-V adapter inputs without external LDO pre-regulation. |
| Output Current (Buck1 / Buck2 / Buck3) | 3 A / 2 A / 2 A - enables independent powering of CPU core, memory I/O, and peripheral rails in space-constrained systems. |
| Feedback Reference Voltage | 0.6 V ±1% - allows precise low-voltage output setting (e.g., 1.0 V, 1.5 V, 1.8 V) using standard 1% resistors with minimal error contribution. |
| Switching Frequency Range | 250 kHz to 2.4 MHz - permits optimization of inductor size (e.g., 0.47 µH at 1 MHz) and efficiency vs. EMI trade-offs. |
| Power-Good Monitoring | PGOOD open-drain output asserts high only after all three outputs reach regulation and sequencing completes - ensures safe system boot. |
| Thermal Protection | 160°C trip point with 20°C hysteresis - shuts down all channels during sustained overload and auto-restarts after cooling, preventing permanent damage. |
| Light-Load Efficiency Mode | Pulse Skipping Mode (PSM) - reduces quiescent current to 790 µA (all channels enabled, no switching) and maintains regulation without burst noise. |
Pinout & Package
VQFN-32 (RHB) package, 5.00 mm × 5.00 mm body size with exposed thermal pad soldered to PCB ground for optimal thermal performance (RθJB = 8.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 / EN3 | Independent enable inputs | Each floats to enable its respective buck; internal 2.1-µA pullup allows simple UVLO adjustment via resistor dividers on VINx/VINQ. |
| SS1 / SS2 / SS3 | Soft-start/tracking inputs | 5.5-µA internal current source charges external capacitors to program linear ramp time or implement ratiometric sequencing across outputs. |
| FB1 / FB2 / FB3 | Kelvin feedback sense inputs | Direct connection to resistor divider mid-point minimizes PCB trace IR drop error - critical for <1% output accuracy at full load. |
| LX1 / LX2 / LX3 | Switch node outputs | High dv/dt nodes connecting to external inductors and bootstrap capacitors; require tight layout to minimize EMI and switching losses. |
| BST1 / BST2 / BST3 | Bootstrap supply terminals | Connect 47-nF ceramic capacitors to respective LX pins to sustain high-side gate drive above input rail during 100% duty cycle. |
| PGOOD | Open-drain power-good indicator | Asserts high only when all three outputs are within ±3% regulation and sequencing delay (if configured) has expired - used for processor reset hold-off. |
| ROSC | Oscillator frequency programming | Resistor-to-ground sets switching frequency (e.g., 51.1 kΩ → 1 MHz); enables synchronization to external clock via SYNC input. |
| AGND / PGND1–3 / GND | Analog and power ground returns | Separate AGND (pins 1–3, 21, 32) and PGND (pins 14, 17, 27) paths prevent noise coupling into feedback and compensation networks. |
Key Features
| Feature | Design Value |
|---|---|
| Dedicated ENx and SSx per channel | Enables flexible power-up sequencing (ratiometric, staggered, or simultaneous) without external logic or timers - reduces BOM count. |
| Phase-shifted clocking (Buck1 vs Buck2/Buck3) | 180° offset cuts input RMS current ripple by ~30%, allowing smaller input bulk capacitors and lower EMI filter cost. |
| Integrated high- and low-side MOSFETs | Eliminates six external FETs and associated gate drivers; RDS(on) values (45/50 mΩ Buck1, 60/60 mΩ Buck2/Buck3) ensure >90% efficiency at 1 A–2 A loads. |
| Accurate 0.6-V reference with ±1% tolerance | Supports stable 1.0-V core rail generation with <±10 mV total output error over temperature and line/load - meets modern SoC requirements. |
| Hiccup-mode overcurrent protection | After current limit detection, device halts switching for 512 cycles, then attempts restart; prevents thermal runaway during short-circuit faults. |
Applications
| Printer and Scanner | Digital TV |
|---|---|
Use Scenario: Multi-rail power delivery for image sensor, SoC, and motor driver ICs in compact all-in-one devices. IC Role / Device Role / Timing Role: Primary triple-output PMIC supplying 1.0-V CPU core, 1.5-V DDR interface, and 1.8-V sensor I/O with synchronized startup. Use Value: Eliminates need for three discrete buck converters; PSM mode extends battery life during standby scanning intervals. |
Use Scenario: Power management for 4K UHD video processing SoCs requiring tightly regulated, low-noise supplies. IC Role / Device Role / Timing Role: Centralized power controller delivering 1.0-V GPU core, 1.5-V video decoder, and 1.8-V HDMI PHY rails with monotonic start into pre-biased loads. Use Value: Phase-shifted switching suppresses 1-MHz switching noise from entering sensitive analog video signal paths. |
| Set Top Box | Surveillance System |
Use Scenario: Compact, fanless enclosure demanding high efficiency and thermal resilience under continuous streaming load. IC Role / Device Role / Timing Role: Single-chip solution generating 1.0-V ARM Cortex-A53 core, 1.5-V DDR3L, and 1.8-V Wi-Fi/Bluetooth interface rails. Use Value: Thermal shutdown with 20°C hysteresis prevents lockup during ambient temperature spikes in enclosed enclosures. |
Use Scenario: Outdoor IP camera with wide temperature range (-30°C to 70°C ambient) and PoE-powered operation. IC Role / Device Role / Timing Role: Robust triple buck managing 1.0-V image signal processor, 1.5-V ISP memory, and 1.8-V Ethernet PHY with extended UVLO hysteresis. Use Value: ENx pin UVLO adjustment ensures clean startup even with PoE voltage sag during cable length variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65266RHBR | Pin-compatible variant with identical electrical specs but different default soft-start timing and minor UVLO threshold calibration; not qualified for automotive AEC-Q100. | Targets industrial and consumer applications where automotive qualification is unnecessary; shares same layout and bill-of-materials. | Select TPS65266RHBR for cost-sensitive non-automotive designs requiring identical functionality and footprint. |
| MP8859GQ-Z | Triple 3-A/2-A/2-A buck with 2.5–6.5-V input, but uses fixed 500-kHz frequency and lacks external ROSC/SYNC capability; no phase-shifted clocking. | Suitable for simpler systems where EMI filtering is less critical and programmable frequency is not required. | Choose MP8859GQ-Z when design prioritizes lowest component count over frequency flexibility and input ripple reduction. |
Compared with TPS65266-1, TPS65266RHBR offers identical performance with minor factory calibration differences, while MP8859GQ-Z trades frequency programmability and phase-shifting for reduced external component count - making TPS65266-1 optimal for noise-sensitive, thermally constrained, and sequenced multi-rail systems.
Availability
TPS65266-1 is available at Aetrix Electronics and suitable for printer/scanner, digital TV, and surveillance system designs requiring stable component supply, long-term production continuity, and guaranteed TI original packaging.
Supply support for TPS65266-1 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 expertise in power management ICs for industrial, automotive, and consumer markets.
The TPS65266 product line delivers highly integrated, triple-output synchronous buck converters optimized for space-constrained, multi-rail applications in home entertainment, imaging, and networked edge devices - emphasizing thermal robustness, sequencing flexibility, and light-load efficiency.
FAQ
What is the maximum supported output current per channel for the TPS65266-1?
The TPS65266-1 supports up to 3 A continuous output current on Buck1 and 2 A continuous on both Buck2 and Buck3. These ratings are validated under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design) and include margin for peak current limiting (4.6 A typical for Buck1, 3.1 A for Buck2/Buck3).
How does the TPS65266-1 handle power-up sequencing across its three outputs?
The TPS65266-1 provides independent ENx and SSx pins for each buck channel. By connecting external RC networks to ENx pins, designers can stagger startup timing; linking SSx pins together enables ratiometric ramping. The device also supports monotonic startup into pre-biased loads without output voltage overshoot.
Can the TPS65266-1 operate with an input voltage below 2.7 V?
No - the absolute minimum recommended input voltage for the TPS65266-1 is 2.7 V. Below this, the internal UVLO circuit disables operation. The VINQ pin triggers undervoltage lockout at 2.35 V (rising) and 2.15 V (falling), and ENx pins require ≥1.2 V to enable each channel.
What is the purpose of the ROSC pin on the TPS65266-1?
The ROSC pin sets the switching frequency via an external resistor to ground. With ROSC = 51.1 kΩ, the TPS65266-1 operates at 1 MHz (typical). This pin also accepts an external clock signal (250 kHz–2.4 MHz) for synchronization to system timing sources, reducing beat-frequency EMI in multi-converter systems.
Does the TPS65266-1 support external compensation for loop stability?
Yes - the TPS65266-1 provides dedicated COMP1, COMP2, and COMP3 pins for external Type-II or Type-III compensation networks. Each pin connects to the error amplifier output, allowing designers to optimize phase margin and transient response independently per channel using series RC components.
TPS65266-1RHBR 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):
- 2.7V
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A, 2A, 2A
- Frequency - Switching:
- 250kHz ~ 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TPS65266-1RHBR FAQ
1.How can I place an order for TPS65266-1RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65266-1RHBR 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 TPS65266-1RHBR reliable?
The price and inventory of TPS65266-1RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65266-1RHBR is usually 5 days.
3.What payment methods are accepted for TPS65266-1RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65266-1RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65266-1RHBR?
TPS65266-1RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65266-1RHBR 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 TPS65266-1RHBR?
For technical support, including TPS65266-1RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65266-1RHBR requirements.
6.How does Aetrix verify that TPS65266-1RHBR is sourced from the original manufacturer or authorized distributors?
All TPS65266-1RHBR 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 TPS65266-1RHBR meets industry standards.
7.What is the process for return or replacement of TPS65266-1RHBR?
All TPS65266-1RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65266-1RHBR, 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 TPS65266-1RHBR part is unused and in its original packaging.
Return procedure for TPS65266-1RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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