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Texas Instruments TPS65279VRHHR
- Part No.:
- TPS65279VRHHR
- Manufacturer:
- Texas Instruments
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
TPS65279VRHHR.pdf
- Description:
- IC REG BUCK ADJ 5A DL 36VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,208
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Product details
Overview
TPS65279VRHHR from Texas Instruments is a dual-channel, synchronous step-down DC/DC converter with integrated 31-mΩ high-side and 23-mΩ low-side MOSFETs per channel, delivering up to 5 A continuous output current per buck stage across a 4.5-V to 18-V input range. It supports I²C-controlled 7-bit VID programming (0.68 V–1.95 V in 10-mV steps), 180° out-of-phase operation, and parallel mode for 10-A combined output - used in DTV, TCON, and tablet PC power rails.
For engineers reviewing the TPS65279VRHHR datasheet, TPS65279VRHHR pinout, TPS65279VRHHR application, or TPS65279VRHHR equivalent, this device enables precise voltage sequencing via independent SS1/SS2 pins, programmable slew rate control, cycle-by-cycle overcurrent protection, and thermal warning readback - critical for multi-rail SoC power management in space-constrained consumer electronics.
Technical Context
The TPS65279VRHHR implements constant-frequency peak current-mode control with external ROSC resistor programming (200 kHz–1.6 MHz) and internal PLL synchronization capability. Its dual-buck architecture supports independent enable/disable, soft-start, and feedback configuration - with dedicated EN1/EN2 pins enabling standalone operation without I²C.
Each channel features separate COMP1/COMP2 compensation nodes, BST1/BST2 bootstrap circuits, and PGND1/PGND2 power grounds optimized for low-noise layout. The MODE pin configures forced PWM, pulse-skipping mode (PSM), or current-sharing parallel operation - directly affecting EMI, light-load efficiency, and system-level filtering requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports 9 V, 12 V, and 15 V intermediate bus systems without external pre-regulation. |
| Output Voltage Range (per channel) | 0.68 V to 1.95 V in 10-mV steps via I²C VID - matches core voltage requirements of modern SoCs and FPGAs. |
| Max Output Current (per channel) | 5 A continuous - sufficient for GPU cores, DDR memory rails, or application processors in compact displays. |
| Switching Frequency | 200 kHz to 1.6 MHz set by ROSC resistor - allows trade-off between inductor size (higher fSW) and conduction loss (lower fSW). |
| Thermal Resistance (θJA) | 30.8 °C/W (RHH package) - enables 5-A operation at ≤85°C ambient with standard 2-layer PCB and thermal vias to ground plane. |
| I²C Interface Speed | Standard (100 kHz) and Fast Mode (400 kHz) - compatible with most ARM-based host controllers for dynamic voltage scaling. |
| Protection Features | Cycle-by-cycle overcurrent, hiccup-mode fault recovery, overtemperature shutdown (160°C trip), and BOOT-LX UVLO (2.1 V) - ensures robust operation under short-circuit or thermal overload. |
Pinout & Package
TPS65279VRHHR is housed in a thermally enhanced 36-pin QFN package (6 mm × 6 mm, RHH), featuring an exposed thermal pad soldered to PCB ground for optimal heat dissipation. Pin assignment follows TI's standardized RHH top-view layout with dedicated power, analog, and digital domains separated for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | Control startup timing per rail; UVLO threshold adjustable via external resistors - enables flexible power sequencing without I²C. |
| FB1 / FB2 | Feedback sensing inputs | Accept external resistor dividers for initial boot voltage; switch to internal VID DAC after I²C command - supports both fixed and dynamic configurations. |
| VOUT1 / VOUT2 | Output voltage sense points | Direct connection to regulated output; used for closed-loop regulation and PGOOD monitoring - essential for accurate load transient response. |
| BST1 / BST2 | Bootstrap supply terminals | Connect ceramic capacitor to LX1/LX2 to generate gate drive voltage for high-side MOSFETs - enables 100% duty cycle operation when BOOT-LX > 2.1 V. |
| SS1 / SS2 | Soft-start and tracking inputs | Capacitor-controlled ramp rate; overrides internal reference to coordinate voltage ramping across multiple rails - prevents reverse current into pre-biased loads. |
| COMP1 / COMP2 | Error amplifier compensation outputs | Interface with external RC network to stabilize loop response - critical for maintaining phase margin with varying output capacitance and load conditions. |
| ROSC | Oscillator frequency setting | Resistor-to-ground sets switching frequency; also accepts external clock signal for system-level synchronization - reduces beat frequencies in multi-converter systems. |
| MODE | Operation mode selector | GND = forced PWM; open = PSM; V7V = current sharing - determines whether converters operate independently or as paralleled 10-A source. |
Key Features
| Feature | Design Value |
|---|---|
| I²C-controlled 7-bit VID | Enables real-time voltage adjustment (0.68 V–1.95 V, 10-mV steps) for dynamic power management - reduces need for multiple fixed-output regulators. |
| 180° out-of-phase operation | Halves input ripple current magnitude and reduces required bulk capacitance - lowers EMI and simplifies front-end filter design. |
| Programmable slew rate control | Configurable voltage transition speed via I²C register writes - prevents overshoot/undershoot during VID changes and improves system stability. |
| Current sharing mode (10-A total) | Parallel operation enabled by floating MODE pin - delivers higher current without increasing board area or thermal density per channel. |
| Pulse skipping mode (PSM) | Boosts light-load efficiency (>85% at 50 mA) while maintaining regulation - extends battery life in always-on display subsystems. |
| Dedicated thermal warning readback | I²C-accessible die temperature status flag triggers proactive throttling before thermal shutdown - enhances system reliability in sealed enclosures. |
Applications
| DTV Power Management | TCON Supply |
|---|---|
Use Scenario: Dual-rail power delivery for main SoC (1.2 V) and video processing unit (1.8 V) in digital television platforms. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, sequenced outputs with I²C-based dynamic voltage scaling. Use Value: Enables adaptive power states during HDMI hot-plug detection and content resolution changes - reducing standby power by >40% versus fixed regulators. |
Use Scenario: Precision voltage supply for timing controller ICs driving LCD panels in ultra-thin monitors and smart displays. IC Role / Device Role / Timing Role: Dual-channel buck supplying 3.3 V (I/O) and 1.8 V (core) with matched soft-start to prevent panel flicker during power-up. Use Value: 180° phase shift minimizes input ripple-induced noise on sensitive analog video paths - eliminating visible banding artifacts. |
| Tablet PC Core Rail | BDVD System Power |
Use Scenario: High-efficiency core voltage generation for ARM Cortex-A series processors operating at variable frequencies (0.8 V–1.4 V). IC Role / Device Role / Timing Role: I²C-programmable buck converter delivering 5-A peak current with programmable slew rate for glitch-free DVFS transitions. Use Value: Pulse skipping mode maintains >88% efficiency at 100-mA load - extending battery runtime during idle and background app execution. |
Use Scenario: Dual-output power solution for Blu-ray disc player SoCs requiring 1.2 V (CPU), 3.3 V (interface), and 5 V (laser diode bias). IC Role / Device Role / Timing Role: Primary buck pair generating 1.2 V and 3.3 V; 5 V derived from secondary LDO or discrete boost stage. Use Value: Independent EN1/EN2 pins allow staggered startup - preventing inrush current overload on shared 12-V adapter input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B25RJER | Single-channel, 4-A, 4.5–18-V input; no I²C interface; uses PMBus v1.3; 3.3-mm × 3.3-mm QFN-16 | Requires two units for dual-rail; lacks VID programming and current sharing - suited for simpler, cost-sensitive designs without dynamic scaling. | Select when I²C control is unnecessary and board space favors smaller footprint over feature integration. |
| ISL95831IRZ | Dual 3-A/3-A, 4.5–24-V input; SMBus-compatible; 40-pin QFN; includes telemetry registers but no PSM mode | Higher input voltage ceiling; lower max current per rail; no pulse skipping - better for industrial 24-V systems than consumer 12-V bus rails. | Select for wider VIN range and SMBus compatibility in ruggedized embedded systems where light-load efficiency is secondary. |
Compared with TPS544B25RJER and ISL95831IRZ, the TPS65279VRHHR uniquely integrates I²C VID, current sharing, and PSM in a single 36-pin QFN - making it optimal for space-constrained, dynamically scaled consumer electronics requiring coordinated dual-rail control.
Availability
TPS65279VRHHR is available at Aetrix Electronics and suitable for DTV, TCON, and tablet PC applications requiring stable component supply, long-term production continuity, and qualified automotive-grade alternatives for industrial use cases.
Supply support for TPS65279VRHHR 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 TPS65279V product line was developed specifically for high-density, multi-rail consumer electronics power systems - emphasizing I²C configurability, thermal efficiency, and layout simplicity in thin-profile devices.
FAQ
What is the maximum supported switching frequency for TPS65279VRHHR?
The TPS65279VRHHR supports a programmable switching frequency range of 200 kHz to 1.6 MHz via the ROSC pin. At 1.6 MHz, the minimum on-time constraint (94 ns) remains satisfied for typical duty cycles, enabling compact magnetics in portable applications. The internal oscillator synchronizes to external clocks within this range for deterministic timing alignment.
Does TPS65279VRHHR support powering pre-biased loads?
Yes, the TPS65279VRHHR supports monotonic startup into pre-biased outputs via its current-mode architecture and controlled soft-start ramp. When SS1 or SS2 is driven externally, the internal reference is overridden - allowing seamless voltage tracking without reverse current flow, critical for hot-swap and multi-rail sequencing scenarios involving TPS65279VRHHR.
How does the MODE pin affect TPS65279VRHHR operation?
The MODE pin configures three distinct operating modes: grounded for forced PWM, open for pulse-skipping mode (PSM), or tied to V7V for current-sharing parallel operation. In current-sharing mode, TPS65279VRHHR combines both channels to deliver up to 10 A with matched current sharing - verified in Figure 33–38 of the SLVSBW1B datasheet.
Can TPS65279VRHHR operate without I²C communication?
Yes, TPS65279VRHHR operates fully without I²C: EN1/EN2 pins provide standalone enable control, external FB1/FB2 resistors set initial output voltage (0.6 V reference), and MODE/SS pins configure behavior. I²C adds dynamic VID, status readback, and advanced sequencing - but is optional for fixed-voltage applications using TPS65279VRHHR.
What thermal performance can be expected from TPS65279VRHHR in a 2-layer PCB?
In a standard 2-layer PCB with 2 oz copper, 10 thermal vias under the exposed pad, and minimal copper pour, TPS65279VRHHR achieves θJA ≈ 30.8 °C/W. At 5-A load and 12-V input, junction temperature rise is ~155°C above ambient - staying within the 150°C max virtual junction limit only if ambient is held ≤45°C. For full 5-A continuous operation, 4-layer boards with internal ground planes are recommended.
TPS65279VRHHR 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:
- Adjustable (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:
- 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)
TPS65279VRHHR FAQ
1.How can I place an order for TPS65279VRHHR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65279VRHHR 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 TPS65279VRHHR reliable?
The price and inventory of TPS65279VRHHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65279VRHHR is usually 5 days.
3.What payment methods are accepted for TPS65279VRHHR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65279VRHHR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65279VRHHR?
TPS65279VRHHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65279VRHHR 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 TPS65279VRHHR?
For technical support, including TPS65279VRHHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65279VRHHR requirements.
6.How does Aetrix verify that TPS65279VRHHR is sourced from the original manufacturer or authorized distributors?
All TPS65279VRHHR 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 TPS65279VRHHR meets industry standards.
7.What is the process for return or replacement of TPS65279VRHHR?
All TPS65279VRHHR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65279VRHHR, 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 TPS65279VRHHR part is unused and in its original packaging.
Return procedure for TPS65279VRHHR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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