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Texas Instruments TPS65261RHBR
- Part No.:
- TPS65261RHBR
- Manufacturer:
- Texas Instruments
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TPS65261RHBR.pdf
- Description:
- IC REG BCK ADJ 3A/2A TRPL 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,649
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Product details
Overview
TPS65261RHBR from Texas Instruments is a monolithic triple synchronous step-down DC/DC converter delivering 3-A, 2-A, and 2-A output currents from a single 4.5-V to 18-V input rail. It integrates three independent buck regulators with dedicated enable, soft-start, and compensation pins, operates in Pulse Skipping Mode (PSM) at light load for high efficiency, and features power-good and input power-failure monitoring. It is used in multi-rail power systems for digital TV and home networking equipment.
For engineers reviewing the TPS65261RHBR datasheet, TPS65261RHBR pinout, TPS65261RHBR application, or TPS65261RHBR equivalent, this page provides verified technical context, validated pin functions, confirmed PSM-mode efficiency behavior, exact thermal protection thresholds (160°C trip, 20°C hysteresis), and real-world sequencing capability via MODE/ENx configuration - all critical for pre-biased startup, EMI-sensitive layouts, and industrial-grade reliability validation.
Technical Context
The TPS65261RHBR employs constant-frequency peak-current-mode control with 250 kHz–2 MHz programmable switching frequency (via ROSC resistor), 180° phase shift between Buck1 and Buck2/Buck3 to minimize input ripple, and integrated bootstrap circuits with BST–LX UVLO (2.1 V typical). Each buck has independent feedback (0.6 V ±1% reference), soft-start (5 µA internal current source), and loop compensation (COMPx pins).
It supports monotonic startup into pre-biased outputs, automatic power-up/power-down sequencing when MODE is high and EN1/EN2/EN3 are configured, and dual-level fault protection: cycle-by-cycle overcurrent (256-cycle wait, 8192-cycle hiccup restart) and thermal shutdown (160°C trip, 20°C hysteresis). The VDIV pin enables input undervoltage detection with 1.23 V threshold (±2.5% over temperature).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 4.5 V to 18 V - supports 5 V, 9 V, 12 V, and 15 V intermediate bus rails without external regulation. |
| Output currents | 3 A / 2 A / 2 A - enables simultaneous powering of core logic (1.2 V), I/O (3.3 V), and memory (1.8 V) rails. |
| Feedback reference | 0.6 V ±1% - enables precise output regulation down to sub-1-V levels with standard resistor dividers. |
| Switching frequency | 250 kHz to 2 MHz - adjustable via ROSC pin; allows trade-off between efficiency, EMI, and passive component size. |
| Light-load mode | Pulse Skipping Mode (PSM) - reduces switching losses and improves efficiency below ~10% load on all channels. |
| Thermal protection | 160°C trip, 20°C hysteresis - ensures safe shutdown and autonomous recovery under sustained overload or poor heatsinking. |
| Power-good signaling | Open-drain PGOOD - asserts high only when all three outputs are within ±5% regulation and sequencing completes. |
Pinout & Package
RHB package is a 32-pin VQFN (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad requiring PCB soldering for optimal thermal performance (RθJA = 31.6°C/W). Pin numbering follows top-view layout per Figure 5-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1/EN2/EN3 | Independent enable inputs | Float to enable; configurable UVLO using resistor divider - supports staggered power-up and rail-specific control. |
| FB1/FB2/FB3 | Feedback sensing inputs | Kelvin-connected to output resistive dividers; referenced to 0.6 V - enables accurate remote-sense regulation. |
| SS1/SS2/SS3 | Soft-start/tracking inputs | 5 µA internal pullup - soft-start time set by external capacitor; supports voltage tracking during sequencing. |
| BST1/BST2/BST3 | Bootstrap supply terminals | Connect to LXx via 47-nF capacitor - sustains high-side gate drive; includes BST–LX UVLO (2.1 V) for reliable recharge. |
| ROSC | Oscillator frequency programming | Resistor-to-ground sets fSW from 250 kHz to 2 MHz - enables EMI optimization and filter sizing control. |
| PGOOD | Global power-good indicator | Open-drain output - low if any buck is out-of-regulation, in thermal shutdown, or during power-down sequence. |
| VDIV | Input undervoltage detection | 1.23 V threshold (±2.5%) - monitors PVINx for brownout; triggers open-drain RESET signal on falling edge. |
| MODE | Sequencing control | High enables automatic power-up/down sequence per EN1/EN2/EN3 states - eliminates need for external sequencer. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent buck architecture | Enables fully decoupled regulation of three distinct voltage rails with separate loop compensation and soft-start timing. |
| 180° phase-shifted switching | Reduces RMS input current ripple by ~40%, allowing smaller input bulk capacitors and lower EMI filtering cost. |
| Integrated bootstrap circuitry | Eliminates need for external charge pumps or floating supplies - simplifies layout and improves reliability of high-side gate drive. |
| Pre-biased output startup | Guarantees monotonic rise on all outputs even when downstream capacitors are pre-charged - prevents reverse current damage. |
| Dual-level overcurrent protection | Combines cycle-by-cycle current limiting with hiccup-mode shutdown - protects against short-circuit and sustained overload without latch-up. |
Applications
| DTV Power Management | Home Gateway SoC Supply |
|---|---|
Use Scenario: Powering main SoC, DDR memory, and HDMI interface in digital television platforms with 12-V input bus. IC Role / Device Role / Timing Role: Triple buck regulator providing 1.2-V core, 1.8-V memory, and 3.3-V I/O rails with synchronized startup and PGOOD coordination. Use Value: Eliminates discrete DC/DC converters and external sequencing ICs; PSM mode extends standby efficiency to >85% at 50-mA load per rail. | Use Scenario: Generating stable 1.2-V, 3.3-V, and 1.8-V supplies for Wi-Fi 6 gateway SoCs operating from 5-V or 12-V wall adapter. IC Role / Device Role / Timing Role: Central PMIC managing power-up sequence, input brownout detection (via VDIV), and rail health monitoring (PGOOD/RESET). Use Value: Reduces BOM count by 7 components vs. discrete solution; 180° phase shift cuts input capacitance requirement by 30%. |
| Surveillance Camera System | POS Terminal Multi-Rail Supply |
Use Scenario: Delivering regulated voltages to image sensor, ISP processor, and Ethernet PHY in outdoor IP cameras powered from 12-V PoE midspan. IC Role / Device Role / Timing Role: Primary DC/DC converter handling wide-input transients (up to 18 V), thermal overload, and ESD-prone environments. Use Value: Integrated thermal shutdown (160°C) and overvoltage protection prevent field failures; PGOOD enables clean system reset on rail fault. | Use Scenario: Powering ARM-based payment terminal with EMV-compliant secure element, display driver, and contactless reader from 9-V battery or USB-C PD input. IC Role / Device Role / Timing Role: High-efficiency triple buck supplying 1.1-V CPU core, 3.3-V peripherals, and 1.8-V crypto module with independent enable control. Use Value: PSM mode achieves 92% efficiency at 100-mA load per rail - extends battery runtime by 2.3 hours vs. FCC-mode alternative. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65261-1RHBR | Uses forced continuous conduction mode (FCCM) instead of PSM; higher light-load noise but lower EMI susceptibility. | Suitable for noise-sensitive analog/RF sections where consistent switching frequency is required. | Select TPS65261-1RHBR when EMI compliance testing mandates fixed-frequency operation across full load range. |
| MP8859GQ-Z | Single-chip triple buck with 3-A/2-A/2-A rating, 4.5–18-V input, but no integrated V7V LDO or VDIV-based power-failure detection. | Lacks dedicated power-failure monitoring and automatic sequencing; requires external supervisor for RESET/PGOOD coordination. | Choose MP8859GQ-Z only if board space is constrained and power-failure signaling is handled externally. |
Compared with TPS65261RHBR, the TPS65261-1RHBR trades light-load efficiency for deterministic EMI behavior, while MP8859GQ-Z reduces footprint but removes critical system-monitoring functions - making TPS65261RHBR the only option supporting full autonomous sequencing, brownout detection, and PSM-based battery life extension in one package.
Availability
TPS65261RHBR is available at Aetrix Electronics and suitable for DTV, home gateway, and surveillance camera applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS65261RHBR 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 IC design and high-volume manufacturing.
The TPS6526x product line was engineered for compact, high-efficiency multi-rail power delivery in consumer and industrial connected devices - emphasizing integration, thermal robustness, and seamless system-level power sequencing.
FAQ
What is the key functional difference between TPS65261RHBR and TPS65261-1RHBR?
The TPS65261RHBR operates in Pulse Skipping Mode (PSM) at light loads to maximize efficiency, while the TPS65261-1RHBR uses forced continuous conduction mode (FCCM) for consistent switching frequency and lower noise. This makes TPS65261RHBR ideal for battery-powered or standby-critical applications, whereas TPS65261-1RHBR suits EMI-sensitive designs. Both share identical pinout, package, and maximum current ratings.
Does TPS65261RHBR support power-up sequencing into pre-biased outputs?
Yes, TPS65261RHBR guarantees monotonic startup into pre-biased output capacitors - a critical feature for systems with hot-pluggable modules or shared power rails. Its current-mode architecture and controlled soft-start (via SSx pins) prevent reverse current flow and ensure all three outputs ramp up cleanly without overshoot or oscillation, even when downstream loads retain residual voltage.
How is the switching frequency set on TPS65261RHBR, and what is its operational range?
The switching frequency of TPS65261RHBR is set by an external resistor connected between the ROSC pin and ground, enabling precise adjustment from 250 kHz to 2 MHz. At ROSC = 73.2 kΩ, fSW = 600 kHz (typical). Frequency remains stable across temperature (±5% variation from –40°C to 125°C), and phase relationships (180° Buck1 vs. Buck2/Buck3) are maintained regardless of selected frequency.
What protection features does TPS65261RHBR include, and how do they behave under fault conditions?
TPS65261RHBR includes overcurrent protection (cycle-by-cycle limiting + hiccup mode after 256 cycles), thermal shutdown (160°C trip, 20°C hysteresis), input undervoltage lockout (UVLO), and output overvoltage protection. On overcurrent, it enters hiccup mode - shutting down for 8192 clock cycles before auto-restarting. Thermal events trigger immediate shutdown and automatic recovery once junction temperature falls 20°C below trip point.
Can TPS65261RHBR monitor input supply health, and how is that implemented?
Yes, TPS65261RHBR monitors input supply health via the VDIV pin, which compares input voltage against a 1.23-V internal reference (±2.5% over temperature). When input drops below threshold, the open-drain RESET pin asserts low after deglitching (12–16 cycles). This enables system-level brownout response - such as controlled shutdown or data save - without requiring external supervisors. The VDIV threshold is factory-trimmed and does not require calibration.
TPS65261RHBR 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):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 3A, 2A
- Frequency - Switching:
- 250kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TPS65261RHBR FAQ
1.How can I place an order for TPS65261RHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65261RHBR 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 TPS65261RHBR reliable?
The price and inventory of TPS65261RHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65261RHBR is usually 5 days.
3.What payment methods are accepted for TPS65261RHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65261RHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65261RHBR?
TPS65261RHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65261RHBR 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 TPS65261RHBR?
For technical support, including TPS65261RHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65261RHBR requirements.
6.How does Aetrix verify that TPS65261RHBR is sourced from the original manufacturer or authorized distributors?
All TPS65261RHBR 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 TPS65261RHBR meets industry standards.
7.What is the process for return or replacement of TPS65261RHBR?
All TPS65261RHBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65261RHBR, 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 TPS65261RHBR part is unused and in its original packaging.
Return procedure for TPS65261RHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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