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Texas Instruments TPS65276VRHHR
- Part No.:
- TPS65276VRHHR
- Manufacturer:
- Texas Instruments
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
TPS65276VRHHR.pdf
- Description:
- IC REG BUCK PROG DL 36VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,156
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Product details
Overview
TPS65276VRHHR from Texas Instruments is a dual-channel synchronous step-down DC/DC converter with integrated high- and low-side MOSFETs, delivering up to 6 A on Buck 1 and 3.5 A on Buck 2. It operates from 4.5 V to 18 V input, supports I²C-controlled 7-bit VID programming (0.68 V–1.95 V in 10-mV steps), and features 180° out-of-phase switching to reduce input ripple-used in DTV, TCON, and tablet PC power rails.
For engineers reviewing the TPS65276VRHHR datasheet, TPS65276VRHHR pinout, TPS65276VRHHR application, or TPS65276VRHHR equivalent, key selection criteria include I²C programmability, independent soft-start/enable per channel, peak current-mode control with ROSC-set frequency (200 kHz–1.6 MHz), thermal shutdown at 160°C, and 36-pin QFN (6 mm × 6 mm) package with exposed thermal pad.
Technical Context
The TPS65276VRHHR implements constant-frequency peak current-mode control with external compensation via COMP1/COMP2 pins, enabling fast transient response and simplified loop design. Each buck channel uses dedicated ENx, SSx, FBx, and BSTx/LXx nodes for independent sequencing, voltage tracking, and bootstrap gate drive.
Its I²C interface (100 kHz/400 kHz) enables real-time readback of power-good status, die temperature warning, and VID-programmed output voltages-while MODE pin configuration selects forced PWM, pulse-skipping mode (PSM), or current-sharing operation. The internal 6.3-V V7V LDO powers control circuitry and optimizes MOSFET RDS(on).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports common intermediate bus rails (9 V, 12 V, 15 V) and wide battery input. |
| Output Current (Buck 1 / Buck 2) | 6 A / 3.5 A continuous - enables single-chip dual-rail supply for SoC core and I/O domains. |
| VID Output Voltage Range | 0.68 V to 1.95 V in 10-mV steps - precise digital control for dynamic voltage scaling in processors. |
| Switching Frequency | 200 kHz to 1.6 MHz - adjustable via ROSC resistor to optimize efficiency vs. size of inductors/capacitors. |
| Thermal Shutdown Threshold | 160°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| I²C Interface Speed | Up to 400 kHz Fast Mode - enables rapid configuration updates without blocking system boot sequence. |
| Package | 36-pin QFN (6 mm × 6 mm, RHH) with exposed thermal pad - achieves θJA = 30.8°C/W for high-power density layouts. |
Pinout & Package
The TPS65276VRHHR is housed in a 36-pin thermally enhanced QFN package (6 mm × 6 mm, RHH) with an exposed thermal pad soldered to PGND for optimal heat dissipation. Pin functions are electrically and thermally optimized for dual-buck layout: PVIN1/PVIN2 and PGND1/PGND2 are segregated per channel; LX1/LX2 and BST1/BST2 support independent bootstrap networks; SDA/SCL/ADDR enable multi-device I²C addressing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | Allow staggered power-up sequencing; UVLO threshold set externally via resistor dividers. |
| SS1 / SS2 | Soft-start/tracking control | Capacitor-based ramp rate control for monotonic startup into pre-biased loads or rail coordination. |
| FB1 / FB2 | Voltage feedback sense | Reference point for initial analog voltage setting (0.6 V); bypassed when I²C VID is active. |
| VOUT1 / VOUT2 | Output voltage sensing | Direct connection to regulated output; used for PGOOD monitoring and I²C readback calibration. |
| BST1 / BST2 | Bootstrap supply | Drives high-side MOSFET gates; requires ceramic capacitor between BSTx and LXx (min. 0.1 µF). |
| LX1 / LX2 | Switching node | High dv/dt node requiring tight layout to PGND; connects to external inductor and bootstrap capacitor. |
| ROSC | Oscillator frequency set | Resistor-to-ground sets fSW; also accepts external clock for synchronization across multiple converters. |
| SDA / SCL / ADDR | I²C interface | Enable dynamic voltage reprogramming, fault status polling, and multi-device address selection (0x60–0x62). |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase operation | Reduces RMS input current ripple by ~30%, allowing smaller input bulk capacitors and lower EMI filter cost. |
| I²C-controlled slew rate | Programmable voltage transition speed (e.g., 10 mV/16 Tsw) prevents overshoot during dynamic VID changes. |
| Dedicated V7V LDO (6.3 V) | Stable internal bias rail improves high-side FET RDS(on) consistency and reduces dependency on noisy VIN. |
| Cycle-by-cycle overcurrent protection | Prevents MOSFET failure during short-circuit events using real-time inductor current sensing per channel. |
| Hiccup-mode thermal recovery | Auto-restarts after 16384 cycles (~100 ms at 160 kHz) only after junction cools ≥20°C below trip point. |
Applications
| DTV Power Management | TCON Supply |
|---|---|
Use Scenario: Dual-rail power for digital TV main processor (1.2 V) and memory interface (1.8 V) under variable load conditions. IC Role / Device Role / Timing Role: Primary dual-output DC/DC controller managing core and I/O voltage domains with I²C coordination to SoC. Use Value: Enables dynamic voltage scaling and independent rail sequencing to meet HDMI CEC standby requirements and reduce no-load power. | Use Scenario: Precision timing controller (TCON) in LCD panels requiring stable 3.3 V and 5 V rails with low noise and fast transient response. IC Role / Device Role / Timing Role: Dual synchronous buck supplying TCON logic and source/gate drivers with phase-shifted switching to suppress panel EMI. Use Value: 180° out-of-phase operation cuts input ripple amplitude, minimizing conducted emissions that distort display timing signals. |
| Tablet PC Core Supply | Set-Top Box SoC Rail |
Use Scenario: High-efficiency core voltage (0.8 V @ 6 A) and GPU rail (1.1 V @ 3.5 A) in portable tablet platforms with battery input. IC Role / Device Role / Timing Role: Monolithic dual buck delivering scalable core power with I²C readback of PGOOD and die temperature for thermal throttling. Use Value: Pulse-skipping mode (PSM) maintains >85% efficiency at 10 mA load, extending battery runtime during UI idle states. | Use Scenario: Multi-rail power for STB SoC with ARM CPU (1.2 V), DDR3 (1.5 V), and peripheral interfaces (3.3 V) operating off 12 V wall adapter. IC Role / Device Role / Timing Role: Centralized power management IC providing sequenced, monitored, and reconfigurable outputs via I²C host controller. Use Value: Independent ENx/SSx pins allow safe power-up order (DDR before CPU) and prevent latch-up during hot-plug USB events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65273VRHHR | Same pinout and feature set but rated for 4-A/3-A output; lower RDS(on) on Buck 1 (25 mΩ vs. 31 mΩ). | Suitable for lower-current SoC cores where 6-A headroom is unnecessary; identical I²C register map. | Select when total solution cost reduction is prioritized over maximum current capability. |
| MP8859GQ-Z | 4.5–18 V input, dual 6-A/4-A outputs, I²C interface, but no V7V LDO; uses external bias supply. | Requires external 5-V bias rail; lacks integrated 6.3-V LDO for gate drive optimization. | Choose when board space allows separate bias generation and higher light-load efficiency is critical. |
Compared with TPS65276VRHHR, TPS65273VRHHR offers lower conduction loss at reduced current, while MP8859GQ-Z trades integrated bias for higher flexibility in multi-rail systems-neither is pin-compatible, but both serve overlapping mid-power dual-buck use cases with distinct trade-offs in integration and thermal performance.
Availability
TPS65276VRHHR is available at Aetrix Electronics and suitable for DTV, TCON, tablet PC, set-top box, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and I²C-configurable dual-rail power delivery.
Supply support for TPS65276VRHHR 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 TPS65276V product line delivers highly integrated, I²C-programmable dual buck converters for consumer and industrial applications demanding precise voltage control, robust protection, and compact power solutions.
FAQ
What is the maximum supported I²C clock frequency for the TPS65276VRHHR?
The TPS65276VRHHR supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C communication. Its SCL input accepts up to 400 kHz clock frequency with defined timing parameters including tLOW ≥ 1.3 µs and tHIGH ≥ 0.6 µs. This allows rapid VID updates and status polling without interrupting system operation. The TPS65276VRHHR maintains full register access and fault readback capability at 400 kHz, making it suitable for dynamic voltage scaling in real-time applications.
Does the TPS65276VRHHR support 100% duty cycle operation?
Yes, the TPS65276VRHHR supports 100% duty cycle operation as long as the BOOT-LX UVLO threshold (typically 2.1 V) is maintained. The internal boot recharge circuit pulls LX low to refresh the BST capacitor when voltage drops below this threshold. This capability enables regulation down to near-VIN output voltages-critical for low-dropout scenarios in battery-powered systems. The TPS65276VRHHR's architecture ensures reliable gate drive even at minimal VOUT/VIN ratios without external diode assistance.
How does the TPS65276VRHHR handle pre-biased load startup?
TPS65276VRHHR implements monotonic startup into pre-biased loads using controlled soft-start via SS1/SS2 pins and internal current limiting. When enabled, the device ramps output voltage from 0 V regardless of existing rail voltage, preventing reverse current flow through external components. The COMP pin threshold (0.25 V) and hiccup-mode protection further ensure safe entry into regulation. This behavior is confirmed in Figure 21 of the SLVSBW0B datasheet and makes TPS65276VRHHR suitable for hot-swap and multi-rail sequencing environments.
Can the TPS65276VRHHR operate with different switching frequencies on each channel?
No-the TPS65276VRHHR uses a single ROSC pin to set one switching frequency for both buck channels, which operate 180° out of phase. The internal PLL synchronizes both channels to the same oscillator, ensuring consistent timing and ripple cancellation. While independent enable/disable and soft-start are supported, frequency tuning is global. For designs requiring asymmetric frequencies, external clock injection via ROSC is possible but forces both channels to track the injected signal-no native per-channel frequency control exists in the TPS65276VRHHR.
What thermal metrics apply to the TPS65276VRHHR in its QFN package?
The TPS65276VRHHR in the 36-pin QFN (RHH) package has a junction-to-ambient thermal resistance (θJA) of 30.8°C/W under JEDEC-standard high-K board conditions, and a junction-to-board thermal resistance (θJB) of 6°C/W. Its exposed thermal pad must be soldered to a solid PGND plane with ≥6 thermal vias (0.3 mm diameter) to achieve rated performance. These values assume 2 oz copper, 4-layer PCB with internal ground/power planes-deviations significantly impact derating curves shown in Section 7.2 of the datasheet.
TPS65276VRHHR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.68V
- Voltage - Output (Max):
- 1.95V
- Current - Output:
- 6A, 3.5A
- Frequency - Switching:
- 200kHz ~ 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-VQFN (6x6)
TPS65276VRHHR FAQ
1.How can I place an order for TPS65276VRHHR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65276VRHHR 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 TPS65276VRHHR reliable?
The price and inventory of TPS65276VRHHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65276VRHHR is usually 5 days.
3.What payment methods are accepted for TPS65276VRHHR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65276VRHHR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65276VRHHR?
TPS65276VRHHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65276VRHHR 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 TPS65276VRHHR?
For technical support, including TPS65276VRHHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65276VRHHR requirements.
6.How does Aetrix verify that TPS65276VRHHR is sourced from the original manufacturer or authorized distributors?
All TPS65276VRHHR 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 TPS65276VRHHR meets industry standards.
7.What is the process for return or replacement of TPS65276VRHHR?
All TPS65276VRHHR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65276VRHHR, 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 TPS65276VRHHR part is unused and in its original packaging.
Return procedure for TPS65276VRHHR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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