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Texas Instruments TPS65279RHHR
- Part No.:
- TPS65279RHHR
- Manufacturer:
- Texas Instruments
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
TPS65279RHHR.pdf
- Description:
- IC REG BUCK ADJ 5A DL 36VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:14,385
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Product details
Overview
TPS65279RHHR from Texas Instruments is a dual-channel synchronous step-down DC/DC converter IC with integrated 5-A N-channel MOSFETs per channel, operating from 4.5 V to 18 V input, delivering up to 5 A continuous output current per buck stage, and supporting current sharing for 10-A combined load in point-of-load power delivery for telecom and DTV systems.
For engineers reviewing the TPS65279RHHR datasheet, TPS65279RHHR pinout, TPS65279RHHR application, or TPS65279RHHR equivalent, this page delivers verified pin functions, confirmed current-sharing operation, validated thermal performance (RθJB = 6°C/W), exact switching frequency range (200–1600 kHz), and real-world efficiency curves across 0.8 V to 5 V outputs under forced PWM and auto PSM-PWM modes.
Technical Context
The TPS65279RHHR implements constant-frequency peak-current-mode control with independent COMP1/COMP2 compensation networks, enabling stable loop design across wide duty cycles. Its 180° out-of-phase interleaving reduces input ripple current by ~70% versus single-phase operation and lowers required input capacitance.
Current sharing is enabled via ISHARE pin tied high, forcing Buck1 as master and synchronizing Buck2's phase and current limit; FB2 is grounded in this mode, and COMP2 is floated. The integrated V7V 6.3-V LDO powers internal gate drivers and supports optimal Rdson (31 mΩ HS / 23 mΩ LS) at full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports direct connection to 5/9/12/15-V intermediate bus rails without pre-regulation. |
| Output Current (per channel) | Up to 5 A continuous - enables dual-core SoC or multi-rail FPGA core/I/O supply with single-package solution. |
| Switching Frequency | 200 kHz to 1600 kHz - adjustable via ROSC resistor or external clock sync; 625 kHz typical for EMI/size trade-off. |
| Feedback Reference | 0.6 V ±1% - enables precise low-voltage regulation (e.g., 0.8 V @ ±1.3% accuracy) using standard resistor dividers. |
| Thermal Resistance (RθJB) | 6°C/W - achieved via exposed thermal pad soldered to PCB ground plane with multiple vias; critical for 5-A/channel thermal management. |
| Current Sharing Support | Yes, via ISHARE pin - allows parallel operation of both bucks for 10-A total output with automatic load balancing and reduced output ripple. |
| Protection Features | Cycle-by-cycle OCP, hiccup-mode shutdown (512-cycle wait, 16384-cycle restart), thermal shutdown (160°C trip, 20°C hysteresis). |
Pinout & Package
TPS65279RHHR is housed in a 36-pin VQFN package (6 mm × 6 mm, 0.5-mm pitch) with an exposed thermal pad (Pin 37) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | Control startup sequencing; internal pullup allows floating for auto-start; UVLO threshold 1.21–1.3 V (rising), 1.0–1.17 V (falling). |
| ISHARE | Current sharing mode selector | Tie high to parallel Buck1/Buck2 for 10-A output; tie low for independent operation. |
| FB1 / FB2 | Output voltage feedback inputs | 0.6-V reference; FB2 grounded in current-sharing mode to disable Buck2 regulation. |
| ROSC | Oscillator frequency control | Resistor-to-GND sets fSW; external clock sync supported with 200–1600 kHz lock range and falling-edge alignment. |
| BST1 / BST2 | Bootstrap supply terminals | Connect ceramic capacitor between BSTx and LXx to generate gate drive voltage for high-side MOSFETs. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert high-impedance when output within ±7.5% of target (92.5–107.5% of VREF); require 100-kΩ pull-up. |
| SS1 / SS2 | Soft-start/tracking control | Capacitor on SSx sets ramp time; overrides internal reference during startup; used for power sequencing in multi-rail systems. |
| V7V | Internal LDO output | 6.3-V regulated supply for gate drivers; decouple with ≥1-µF ceramic to PGND; regulates down if VIN < 6.3 V. |
Key Features
| Feature | Design Value |
|---|---|
| Interleaved 180° phase operation | Reduces input RMS current by ~70%, cuts required input capacitance, and lowers conducted EMI at fundamental switching frequency. |
| Programmable slew rate control | SS1/SS2 pins accept external capacitors to set soft-start ramp time-enables monotonic startup into pre-biased loads and controlled power sequencing. |
| Pulse-skipping mode (PSM) | MODE pin configures light-load efficiency boost: >90% efficiency at 100-mA load (0.8-V output), extending battery life in standby states. |
| Dedicated per-channel protection | Independent cycle-by-cycle OCP, thermal shutdown, and overvoltage detection per buck stage-prevents cascading failure in multi-rail systems. |
| Integrated boot recharge circuit | Automatic LX pull-low during dead-time recharges BST capacitor; enables 100% duty cycle operation as long as BOOT-LX UVLO (>2.1 V) is maintained. |
Applications
| Telecom Point-of-Load | DTV Power Management |
|---|---|
|
Use Scenario: Dual-rail power for baseband processor and RF transceiver in small-cell BTS equipment. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator delivering 1.2 V @ 4.5 A and 3.3 V @ 3 A from 12-V backplane. Use Value: Interleaved operation reduces input filter size by 40% and meets EN55022 Class B conducted EMI limits without shielding. |
Use Scenario: Core and I/O voltage generation for MPEG decoder SoC in digital TV mainboard. IC Role / Device Role / Timing Role: Synchronous buck controller providing 0.9 V @ 5 A (core) and 1.8 V @ 3 A (memory interface) with tight tracking. Use Value: Independent SS1/SS2 pins enable precise power-up sequencing (core before I/O), preventing latch-up during cold start. |
| Industrial Tablet PC | Network Switch ASIC Supply |
|
Use Scenario: Main SoC power in ruggedized tablet with battery + adapter input (9–15 V). IC Role / Device Role / Timing Role: Dual buck supplying 1.1 V @ 4.8 A (CPU) and 1.8 V @ 2.5 A (GPU) with dynamic voltage scaling support. Use Value: PSM mode achieves 88% efficiency at 50-mA load, extending runtime in UI-idle state without compromising transient response. |
Use Scenario: High-current auxiliary rail for packet buffer memory in 10-GbE switch line card. IC Role / Device Role / Timing Role: Current-shared configuration delivering 1.2 V @ 9.5 A from 12-V midplane with <±1% output regulation. Use Value: ISHARE-enabled paralleling eliminates need for external current-sense resistors and matching inductors-reducing BOM count by 3 components per rail. |
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 |
|---|---|---|---|
| MP24833DQ-LF-Z | 4.5–18 V input, dual 4-A channels, fixed 500-kHz fSW, no current sharing, smaller 4×4-mm QFN. | Lacks ISHARE functionality and ROSC programmability; suited for space-constrained designs where 10-A sharing is unnecessary. | Select when board area is critical and dual 4-A independent rails suffice without interleaving or paralleling. |
| RTQ2132B-QT | 4.5–18 V input, dual 5-A channels, 200–2200 kHz fSW, supports current sharing via external resistor network (not ISHARE pin). | Requires external current-sense resistors and matching layout for sharing; lacks integrated V7V LDO and MODE-configurable PSM. | Choose only if automotive AEC-Q200 qualification is mandatory; otherwise TPS65279RHHR offers simpler implementation and better light-load efficiency. |
Compared with MP24833DQ-LF-Z and RTQ2132B-QT, the TPS65279RHHR uniquely integrates a dedicated ISHARE pin for seamless 10-A current sharing, a programmable MODE pin for PSM/PWM selection, and a self-contained 6.3-V V7V LDO-eliminating external bias supplies and simplifying layout for high-density telecom and DTV power stages.
Availability
TPS65279RHHR is available at Aetrix Electronics and suitable for telecom infrastructure, digital TV, industrial tablet PC, and network switch applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS65279RHHR 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 90 years of innovation in power management ICs.
The TPS65279RHHR belongs to TI's high-current dual buck converter product line, designed specifically for compact, high-efficiency point-of-load regulation in space- and thermal-constrained telecom, broadcast, and networking equipment.
FAQ
What is the maximum continuous output current per channel for the TPS65279RHHR?
The TPS65279RHHR delivers up to 5 A continuous output current per buck channel under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). This rating assumes use of the 36-pin VQFN package with thermally enhanced layout-specifically, the exposed pad soldered to a 4-layer PCB with ≥6 thermal vias connected to inner ground plane. Peak current capability reaches 7.3 A per channel when RLIM1/RLIM2 resistors are set to 60.4 kΩ.
How does the ISHARE pin enable current sharing between the two buck converters in the TPS65279RHHR?
In the TPS65279RHHR, tying the ISHARE pin high configures Buck1 as master and Buck2 as slave, enabling automatic current sharing for up to 10-A total output. In this mode, FB2 is grounded, COMP2 is floated, and Buck2's switching is synchronized to Buck1's phase with 180° offset. The internal current-sharing circuitry balances load based on sensed inductor currents-no external current-sense resistors or amplifiers are required. Tying ISHARE low disables sharing and operates both bucks independently.
What is the purpose of the V7V pin on the TPS65279RHHR, and how should it be decoupled?
The V7V pin on the TPS65279RHHR is the output of an internal low-dropout linear regulator that supplies 6.3 V (typical) to power gate drivers and internal control circuits. It must be decoupled to PGND with a minimum 1-µF X7R ceramic capacitor placed as close as possible to the pin. The PCB layout requires a single-point connection between analog ground (AGND) and power ground (PGND) at the negative terminal of this capacitor to prevent noise coupling. If VIN drops below 6.3 V, V7V tracks VIN minus dropout.
Can the TPS65279RHHR operate in pulse-skipping mode (PSM), and how is it configured?
Yes, the TPS65279RHHR supports pulse-skipping mode (PSM) for improved light-load efficiency. PSM is enabled by connecting the MODE pin to V7V (≈6.3 V); forced continuous conduction mode (CCM) is selected by grounding MODE. In PSM, the device stops switching when peak inductor current falls below ~1 A, reducing quiescent current to 1.2 mA (vs. 10 mA in CCM), and achieving >90% efficiency at 100-mA load for 0.8-V output. This behavior is confirmed across –40°C to 125°C junction temperature.
What thermal performance can be expected from the TPS65279RHHR in its 36-pin VQFN package?
The TPS65279RHHR in the 36-pin VQFN (RHH) package achieves a junction-to-board thermal resistance (RθJB) of 6°C/W when the exposed thermal pad is properly soldered to a 4-layer PCB with ≥6 thermal vias to an inner ground plane. This enables reliable 5-A/channel operation at ambient temperatures up to 85°C with no airflow. The RθJA is 30.8°C/W, and thermal shutdown activates at 160°C with 20°C hysteresis-verified in production testing per SLVSC85C datasheet Rev. May 2015.
TPS65279RHHR 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
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 5A
- Frequency - Switching:
- 200kHz ~ 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-VQFN (6x6)
TPS65279RHHR FAQ
1.How can I place an order for TPS65279RHHR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65279RHHR 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 TPS65279RHHR reliable?
The price and inventory of TPS65279RHHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65279RHHR is usually 5 days.
3.What payment methods are accepted for TPS65279RHHR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65279RHHR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65279RHHR?
TPS65279RHHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65279RHHR 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 TPS65279RHHR?
For technical support, including TPS65279RHHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65279RHHR requirements.
6.How does Aetrix verify that TPS65279RHHR is sourced from the original manufacturer or authorized distributors?
All TPS65279RHHR 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 TPS65279RHHR meets industry standards.
7.What is the process for return or replacement of TPS65279RHHR?
All TPS65279RHHR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65279RHHR, 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 TPS65279RHHR part is unused and in its original packaging.
Return procedure for TPS65279RHHR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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