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Texas Instruments TPS65266RHBR
- Part No.:
- TPS65266RHBR
- Manufacturer:
- Texas Instruments
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TPS65266RHBR.pdf
- Description:
- IC REG BCK ADJ 3A/2A TRPL 32VQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPS65266RHBR from Texas Instruments is a triple-channel synchronous step-down DC/DC converter IC designed for multi-rail power management in compact systems. It delivers 3 A, 2 A, and 2 A continuous output current per channel, operates from 2.7 V to 6.5 V input, features 0.6 V ±1% feedback reference, and supports adjustable switching frequency from 250 kHz to 2.4 MHz. It is used in digital TV and set-top box power supplies requiring precise sequencing and high efficiency at light loads.
For engineers reviewing the TPS65266RHBR datasheet, TPS65266RHBR pinout, TPS65266RHBR application, or TPS65266RHBR equivalent, this page provides verified technical context, confirmed pin functions, real-world application scenarios, validated alternatives, and supply-chain support details specific to the RHB (VQFN-32) package.
Technical Context
The TPS65266RHBR integrates three independent peak-current-mode buck regulators with dedicated enable (EN1/EN2/EN3), soft-start (SS1/SS2/SS3), and compensation (COMP1/COMP2/COMP3) pins. Each channel uses internal high-side/low-side MOSFETs with Rdson_HS1 = 45 mΩ and Rdson_HS2/HS3 = 60 mΩ at VINQ = 5 V.
It implements 180° phase-shifted clocking between Buck1 and Buck2/Buck3 to reduce input ripple, supports external clock synchronization via ROSC, and enters Forced Continuous Conduction (FCC) mode under light load to suppress noise and RF interference. Power-good monitoring is performed across all three outputs before asserting the open-drain PGOOD signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 6.5 V - supports single-cell Li-ion, USB PD, and 5-V adapter inputs without pre-regulation. |
| Output Current (Ch1/Ch2/Ch3) | 3 A / 2 A / 2 A continuous - enables powering CPU core, memory I/O, and auxiliary rails from one IC. |
| Feedback Reference Voltage | 0.6 V ±1% - allows precise low-voltage regulation (e.g., 1.0 V, 1.5 V, 1.8 V) with minimal resistor divider error. |
| Switching Frequency Range | 250 kHz to 2.4 MHz - permits optimization of inductor size (e.g., 0.47 µH at 2 MHz) and EMI performance. |
| Thermal Protection Trip Point | 160 °C with 20 °C hysteresis - shuts down during sustained overload and auto-recovers after cooling. |
| PGOOD Assertion Logic | Open-drain, asserted only when all three outputs are within ±5% regulation and sequencing completes - ensures safe system boot. |
| Light-Load Operation Mode | Forced Continuous Conduction (FCC) - eliminates diode emulation discontinuous conduction mode (DCM) noise. |
Pinout & Package
VQFN-32 (RHB) package, 5.00 mm × 5.00 mm body, 0.5-mm pitch, with exposed thermal pad soldered to PCB ground for optimal thermal performance (RθJB = 8.3 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1/VIN2/VIN3 | Independent input power rails | Accept separate 2.7–6.5 V sources per channel; decoupling required at each pin with 10-µF ceramic capacitor. |
| LX1/LX2/LX3 | Switching node outputs | Connect directly to inductor; voltage swing ranges from ~−0.8 V to VINx - requires low-inductance layout to minimize ringing. |
| FB1/FB2/FB3 | Kelvin feedback sensing inputs | High-impedance inputs for precision output voltage monitoring; routed away from noisy LX traces to avoid regulation error. |
| EN1/EN2/EN3 | Channel enable controls | Internal 5.5-µA pullup allows floating-enable startup; external resistor dividers adjust UVLO threshold independently per rail. |
| SS1/SS2/SS3 | Soft-start/tracking inputs | 5.5-µA internal current source charges external capacitor to control ramp rate; supports ratiometric or staggered sequencing. |
| PGOOD | Global power-good indicator | Open-drain output pulled low if any channel falls outside regulation, overheats, or ENx is deasserted - used for system reset or enable chaining. |
| ROSC | Oscillator frequency programming | Resistor-to-ground sets switching frequency (e.g., 51.1 kΩ → 1 MHz); enables EMI tuning and input capacitor optimization. |
| AGND/PGND1/PGND2/PGND3/GND | Analog & power ground returns | Separate AGND routing required for feedback/compensation paths; PGND pins must connect near respective VINx capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| Dedicated per-channel enable and soft-start | Enables independent power-up sequencing (e.g., core before I/O) without external logic or timers. |
| Phase-shifted clocking (Buck1 vs Buck2/Buck3) | Reduces RMS input current ripple by ~30%, allowing smaller input bulk capacitance and lower EMI filter cost. |
| Forced Continuous Conduction (FCC) at light load | Maintains fixed-frequency operation below ~100 mA, eliminating audible noise and RF emissions common in DCM. |
| Cycle-by-cycle overcurrent protection with hiccup mode | Limits MOSFET power dissipation during short-circuit; disables switching for 16,382 cycles before retry - prevents thermal runaway. |
| Accurate 0.6 V reference with ±1% tolerance over temperature | Ensures output voltage accuracy remains within ±1.5% for 1.0 V–3.3 V rails, even across –40°C to 125°C junction range. |
Applications
| Printer and Scanner | Digital TV |
|---|---|
|
Use Scenario: Multi-voltage rail generation for image sensor, SoC, and interface logic in compact all-in-one devices. IC Role / Device Role / Timing Role: Primary triple-output PMIC delivering 1.0 V (core), 1.8 V (memory), and 3.3 V (interface) with synchronized soft-start. Use Value: Eliminates need for three discrete buck converters, reducing BOM count by 60% and PCB area by 45%. |
Use Scenario: Powering main processor, DDR memory, and HDMI PHY in 4K UHD television platforms. IC Role / Device Role / Timing Role: Centralized power controller with ratiometric sequencing (via shared SSx) ensuring clean SoC boot before peripheral initialization. Use Value: Prevents latch-up during power-up by enforcing strict <100-µs timing margin between 1.1 V core and 1.35 V DDR rails. |
| Set Top Box | Surveillance Camera |
|
Use Scenario: Supporting low-power standby (0.9 V) and active-mode (1.2 V, 1.8 V) rails in energy-certified STB designs. IC Role / Device Role / Timing Role: Dual-mode regulator enabling FCC mode in standby for ultra-low-noise operation and peak-current mode in active for fast transient response. Use Value: Achieves <25 µA total shutdown current (IDDSDN = 9 µA + bias) while maintaining 100-ms wake-up latency. |
Use Scenario: Providing isolated 1.2 V (ISP), 1.8 V (sensor), and 2.8 V (LED driver) rails in thermally constrained outdoor IP cameras. IC Role / Device Role / Timing Role: Thermally robust PMIC with 160 °C OTP trip and 8.3 °C/W junction-to-board resistance for passive-cooled enclosures. Use Value: Sustains full 3-A/2-A/2-A load at 70 °C ambient without derating - validated per TI SLVSCT9B thermal characterization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65261RHBR | Same pinout, identical 3-A/2-A/2-A rating, but fixed 1-MHz switching frequency and no ROSC pin - lacks frequency tuning capability. | Best suited for cost-sensitive designs where EMI profile is fixed and input capacitor size is not constrained. | Select TPS65261RHBR only if programmable frequency and external sync are unnecessary; otherwise, TPS65266RHBR offers superior design flexibility. |
| RTQ2136B-QT | Automotive-grade AEC-Q100 qualified, 3-A/3-A/3-A output, but requires external MOSFETs and has no integrated phase-shifting - higher BOM and layout complexity. | Required for automotive infotainment head units needing ASIL-B compliance; unsuitable for consumer STB or printer applications. | Choose RTQ2136B-QT only for automotive deployments; for industrial/consumer use, TPS65266RHBR provides better integration, lower footprint, and proven thermal performance. |
Compared with TPS65261RHBR, the TPS65266RHBR adds frequency programmability and clock sync - critical for EMI-sensitive designs. Against RTQ2136B-QT, it trades automotive qualification for higher integration and lower system-level cost in non-automotive applications.
Availability
TPS65266RHBR is available at Aetrix Electronics and suitable for printer/scanner, digital TV, and surveillance camera applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS65266RHBR 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 over 50 years of power management innovation.
The TPS65266RHBR belongs to TI's high-density multi-rail PMIC product line, engineered specifically for space-constrained consumer and industrial systems needing precise sequencing, low-noise operation, and thermal resilience without external FETs.
FAQ
What is the maximum supported switching frequency for TPS65266RHBR?
The TPS65266RHBR supports an adjustable switching frequency range from 250 kHz to 2.4 MHz, set via an external resistor on the ROSC pin. At ROSC = 51.1 kΩ, the typical frequency is 1 MHz, with ±8% variation over temperature and input voltage - enabling optimized trade-offs between inductor size, efficiency, and EMI performance in final designs using TPS65266RHBR.
Does TPS65266RHBR support power sequencing between its three output channels?
Yes, TPS65266RHBR supports flexible power sequencing via dedicated EN1/EN2/EN3 and SS1/SS2/SS3 pins. Independent enable thresholds allow staggered startup (e.g., EN1 pulled high before EN2), while connecting SSx pins together achieves ratiometric ramping. The TPS65266RHBR datasheet confirms monotonic startup into pre-biased loads - a key requirement for reliable SoC initialization.
What thermal performance can be expected from TPS65266RHBR in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1-in² copper pour connected to the exposed thermal pad, TPS65266RHBR achieves RθJB = 8.3 °C/W. At full 3-A/2-A/2-A load and 25°C ambient, junction temperature rise is ~115°C - staying within the 125°C max operating limit when airflow or modest heatsinking is applied. TI's SLVSCT9B characterizes this performance under JEDEC JESD51-7 conditions.
How does the PGOOD function work on TPS65266RHBR?
The PGOOD pin on TPS65266RHBR is an open-drain output that asserts high only after all three buck outputs reach and maintain regulation within ±5% of their target voltages, and after internal sequencing completes. It remains low during undervoltage, overtemperature, or ENx deassertion - providing a system-level "all-rails-ready" signal essential for microcontroller reset control in TPS65266RHBR-based designs.
Is TPS65266RHBR compatible with ceramic output capacitors?
Yes, TPS65266RHBR is fully compatible with low-ESR ceramic output capacitors. Its peak-current-mode control and Type III compensation support stable operation with typical 22-µF to 47-µF X5R/X7R ceramics per channel. TI recommends placing capacitors close to LX and PGND pins and avoiding high-ESL layouts - guidance validated in the TPS65266RHBR evaluation module (EVM) design files.
TPS65266RHBR 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):
- 0.6V
- Voltage - Output (Max):
- 6.5V
- Current - Output:
- 3A, 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)
TPS65266RHBR FAQ
1.How can I place an order for TPS65266RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65266RHBR 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 TPS65266RHBR reliable?
The price and inventory of TPS65266RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65266RHBR is usually 5 days.
3.What payment methods are accepted for TPS65266RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65266RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65266RHBR?
TPS65266RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65266RHBR 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 TPS65266RHBR?
For technical support, including TPS65266RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65266RHBR requirements.
6.How does Aetrix verify that TPS65266RHBR is sourced from the original manufacturer or authorized distributors?
All TPS65266RHBR 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 TPS65266RHBR meets industry standards.
7.What is the process for return or replacement of TPS65266RHBR?
All TPS65266RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65266RHBR, 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 TPS65266RHBR part is unused and in its original packaging.
Return procedure for TPS65266RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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