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Texas Instruments TPS65263RHBT
- Part No.:
- TPS65263RHBT
- Manufacturer:
- Texas Instruments
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TPS65263RHBT.pdf
- Description:
- IC REG BCK PROG 3A/TRPL 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,574
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Product details
Overview
TPS65263RHBT from Texas Instruments is a triple synchronous step-down DC/DC converter IC delivering 3-A, 2-A, and 2-A output currents across three independent buck channels, operating from a 4.5-V to 18-V input supply. It integrates I²C-controlled dynamic voltage scaling (0.68–1.95 V in 10-mV steps), fixed 600-kHz switching frequency with 180° phase shift between Buck1 and Buck2/Buck3, and dedicated enable/soft-start pins per channel-designed for multi-rail power management in DTV LCD panels and home gateway systems.
For engineers reviewing the TPS65263RHBT datasheet, TPS65263RHBT pinout, TPS65263RHBT application, or TPS65263RHBT equivalent, this device supports I²C read-back of power-good status, overcurrent warnings, die temperature alerts, and programmable VID slew rate-enabling precise system-level voltage sequencing, thermal monitoring, and light-load efficiency optimization via pulse-skipping or forced continuous conduction mode.
Technical Context
The TPS65263RHBT implements constant-frequency peak-current-mode control with independent loop compensation (COMP1–COMP3), enabling stable regulation across wide input/output conditions. Each buck uses internal high- and low-side MOSFETs (RDS(on) = 105/65 mΩ for Buck1; 140/90 mΩ for Buck2/Buck3) and integrated bootstrap circuitry (BST1–BST3) with UVLO protection on boot voltage.
I²C interface operates at standard (100 kHz) and fast (400 kHz) modes with 7-bit slave address 0x60H; it enables real-time configuration of output voltages, enable/disable states, PSM/FCC mode selection, and status polling-including PG, OC, and die temperature warnings-without requiring external microcontroller GPIO overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports common intermediate bus rails (5 V, 9 V, 12 V, 15 V) without external pre-regulation. |
| Output Current Capability | 3 A / 2 A / 2 A - independent current ratings per buck channel enable asymmetric rail design for SoC core, I/O, and memory supplies. |
| Switching Frequency | 600 kHz ±5% - fixed frequency simplifies EMI filtering; 180° phase shift between Buck1 and Buck2/Buck3 reduces input ripple and capacitor stress. |
| Feedback Reference Voltage | 0.6 V ±1% - high-accuracy reference enables tight output regulation (±1% typical load/line regulation) across temperature. |
| I²C Interface Speed | Up to 400 kHz - fast-mode operation allows rapid VID updates during dynamic voltage scaling sequences. |
| VID Resolution & Range | 7-bit, 10-mV steps from 0.68 V to 1.95 V - supports fine-grained CPU/GPU core voltage tuning while maintaining monotonic startup into pre-biased loads. |
| Thermal Shutdown Threshold | 160°C trip with 20°C hysteresis - ensures safe recovery after thermal overload without manual reset. |
Pinout & Package
VQFN-32 (RHB) package, 5.00 mm × 5.00 mm body size with exposed thermal pad - requires soldering of thermal pad to PCB ground plane for optimal thermal performance (RθJA = 33.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2, EN3 | Independent enable inputs for Buck1–Buck3 | Float-to-enable logic; configurable UVLO threshold via resistor divider; internal 3.8-µA pullup enables automatic startup. |
| SS1, SS2, SS3 | Soft-start/tracking inputs | 5-µA internal current source sets soft-start time with external capacitor; supports voltage tracking during power-up sequencing. |
| FB1, FB2, FB3 | Kelvin feedback sense inputs | High-impedance inputs for precision resistive divider connection-minimizes layout-induced regulation error. |
| BST1–BST3 | Bootstrap supply terminals | Connect 47-nF capacitor to respective LX pin; internal UVLO prevents high-side FET turn-on if boot voltage drops below ~2.1 V. |
| SDA, SCL | I²C bidirectional data and clock | Supports standard/fast-mode I²C; open-drain outputs with 4-mA sink capability; 0x60H slave address. |
| PGND1–PGND3 | Power ground returns per buck | Must be routed separately from AGND and tied near respective PVIN ceramic capacitor negative terminal to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled dynamic voltage scaling | Enables real-time adjustment of all three output voltages in 10-mV increments-critical for adaptive SoC power management in set-top boxes and surveillance systems. |
| Independent soft-start and enable per buck | Allows staggered power-up sequencing to prevent inrush current overload and ensure monotonic startup into pre-biased loads. |
| Integrated bootstrap circuitry with UVLO | Eliminates need for external bootstrap diodes/capacitors; built-in boot voltage monitoring prevents shoot-through during low-duty-cycle operation. |
| Real-time status monitoring via I²C | Read-back of power-good, overcurrent warning, and die temperature enables closed-loop system health monitoring without additional sensors. |
| Phase-shifted switching (180°) | Reduces RMS input current ripple by ~30%, permitting smaller input bulk capacitors and lowering conducted EMI in compact DTV and gateway designs. |
Applications
| DTV LCD Panel Power | Home Gateway SoC Supply |
|---|---|
Use Scenario: Powers multiple voltage domains (core, I/O, DDR) of an LCD panel controller ASIC under varying ambient temperatures and input bus conditions (12 V or 15 V). IC Role / Device Role / Timing Role: Triple-buck regulator providing isolated, sequenced, and dynamically scalable rails with I²C coordination to match display processing workload. Use Value: Eliminates need for discrete regulators and external sequencing ICs; 600-kHz switching enables compact 2.2-µH inductors and 10-µF ceramic input caps per rail. |
Use Scenario: Supplies CPU core (1.2 V), PHY/interface (3.3 V), and memory (2.5 V) in a broadband home gateway with thermal constraints and firmware-driven power states. IC Role / Device Role / Timing Role: Centralized power management IC coordinating voltage transitions across subsystems via I²C command register writes and status polling. Use Value: Enables deep-sleep mode entry by disabling non-critical bucks via I²C; die temperature read-back triggers thermal throttling before shutdown. |
| Surveillance Camera System | Set-Top Box Mainboard |
Use Scenario: Delivers regulated power to image sensor, video processor, and network interface in outdoor IP cameras with wide input voltage range (9–18 V PoE-derived supply). IC Role / Device Role / Timing Role: Primary DC/DC converter managing simultaneous startup of vision pipeline components with controlled ramp rates to avoid brownouts. Use Value: Independent EN/SS pins allow custom sequencing; overtemperature protection prevents field failures in enclosed enclosures without heatsinks. |
Use Scenario: Powers ARM-based media processor, HDMI transmitter, and USB peripherals in consumer STB designs where board space and BOM count are tightly constrained. IC Role / Device Role / Timing Role: Single-chip solution replacing three discrete buck converters and associated control logic-reducing footprint by >40% versus discrete alternatives. Use Value: Integrated V7V LDO (6.3 V, 185 mA) powers gate drivers and internal circuitry, removing need for external bias supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65261RHBT | Includes open-drain RESET signal for input power failure detection; identical 3-A/2-A/2-A output capability and I²C VID control. | Required when system-level power-fail monitoring and automatic reset assertion are needed-e.g., in gateway routers with fail-safe reboot logic. | Select TPS65261RHBT only if RESET functionality is mandatory; otherwise TPS65263RHBT offers simpler integration with no unused pins. |
| TPS65288RHBT | Integrates two 1.2-A USB power switches (adjustable current limit); same triple-buck topology but reduced buck2/buck3 current rating (2 A → 1.2 A typical). | Suitable for USB-powered devices needing integrated port control-e.g., STBs with front-panel USB host-but not for full 2-A sustained loads on Buck2/Buck3. | Choose TPS65288RHBT when USB switch integration offsets reduced buck current headroom; verify load profiles against 1.2-A typical switch rating. |
Compared with TPS65261RHBT and TPS65288RHBT, the TPS65263RHBT provides pure triple-buck functionality without added RESET or USB switches-making it optimal for space-constrained, thermally sensitive applications where minimal feature set and maximum current delivery per buck are prioritized.
Availability
TPS65263RHBT is available at Aetrix Electronics and suitable for DTV LCD panels, home gateway SoC supplies, and surveillance camera systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS65263RHBT 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 manufacturing.
The TPS65263RHBT belongs to TI's high-density multi-rail PMIC product line, engineered specifically for cost-sensitive, space-constrained consumer and industrial applications requiring I²C-configurable triple-output DC/DC conversion without auxiliary functions.
FAQ
What is the recommended input capacitor configuration for TPS65263RHBT?
Each buck channel (PVIN1, PVIN2, PVIN3) requires a minimum 10-µF ceramic capacitor placed as close as possible to its respective PVIN pin and PGND pin pair. Use X5R/X7R dielectrics rated ≥25 V. For systems with high input ripple or long traces, add a 47-µF–100-µF bulk electrolytic/tantalum capacitor upstream. The TPS65263RHBT's phase-shifted switching reduces total input capacitance requirements versus single-phase solutions.
Does TPS65263RHBT support 100% duty cycle operation?
Yes, the TPS65263RHBT supports 100% duty cycle operation as long as the bootstrap capacitor voltage (BSTx–LXx) remains above the internal UVLO threshold (~2.1 V). This enables dropout operation at low input-to-output differentials-e.g., 5.5-V input to 5-V output on Buck3-without forcing discontinuous conduction mode or losing regulation.
How does the TPS65263RHBT handle pre-biased output conditions during startup?
The TPS65263RHBT implements active pre-bias startup protection: when an output is already biased above the target voltage at enable, the high-side FET remains off and the low-side FET modulates to gently discharge the rail until regulation begins. This prevents reverse current flow and ensures monotonic rise-even when powering into partially charged capacitive loads typical in hot-plug or multi-stage power systems.
Can TPS65263RHBT operate with different input voltages on each PVIN pin?
Yes-PVIN1, PVIN2, and PVIN3 are electrically isolated input supplies. Each can be driven from independent sources (e.g., 12 V for Buck1, 5 V for Buck2, 9 V for Buck3), provided all remain within 4.5–18 V and share a common system ground. This enables flexible power architecture partitioning, such as using separate battery and adapter rails in portable gateways.
What is the function of the V7V pin on TPS65263RHBT?
The V7V pin is an internal 6.3-V LDO output (185-mA current limit) that powers the gate drivers and internal control circuitry. A 10-µF ceramic capacitor must be connected from V7V to PGND. It is not intended as a user-supply rail; loading beyond 185 mA risks instability or dropout, affecting overall converter operation-including I²C communication and soft-start timing.
TPS65263RHBT 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:
- Programmable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.68V
- Voltage - Output (Max):
- 6.3V
- Current - Output:
- 3A, 2A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TPS65263RHBT FAQ
1.How can I place an order for TPS65263RHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65263RHBT 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 TPS65263RHBT reliable?
The price and inventory of TPS65263RHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65263RHBT is usually 5 days.
3.What payment methods are accepted for TPS65263RHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65263RHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65263RHBT?
TPS65263RHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65263RHBT 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 TPS65263RHBT?
For technical support, including TPS65263RHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65263RHBT requirements.
6.How does Aetrix verify that TPS65263RHBT is sourced from the original manufacturer or authorized distributors?
All TPS65263RHBT 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 TPS65263RHBT meets industry standards.
7.What is the process for return or replacement of TPS65263RHBT?
All TPS65263RHBT units undergo pre-shipment inspection (PSI). If there is an issue with TPS65263RHBT, 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 TPS65263RHBT part is unused and in its original packaging.
Return procedure for TPS65263RHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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