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Texas Instruments TPS65279VDAPR
- Part No.:
- TPS65279VDAPR
- Manufacturer:
- Texas Instruments
- Package:
- 32-PowerTSSOP (0.240", 6.10mm Width)
- Datasheet:
-
TPS65279VDAPR.pdf
- Description:
- IC REG BUCK ADJ 5A DL 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,050
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Product details
Overview
TPS65279VDAPR from Texas Instruments is a dual-channel, synchronous step-down DC/DC converter with integrated 5-A n-channel MOSFETs per channel, operating from 4.5 V to 18 V input. It delivers programmable 0.68 V–1.95 V outputs in 10-mV steps via I²C-controlled 7-bit VID, supports 180° out-of-phase operation to reduce input ripple, and enables current sharing up to 10 A. It is used in DTV, TCON, and tablet PC power rails requiring precise voltage sequencing and light-load efficiency.
For engineers reviewing the TPS65279VDAPR datasheet, TPS65279VDAPR pinout, TPS65279VDAPR application, or TPS65279VDAPR equivalent, key selection criteria include I²C-programmable output voltage resolution (10 mV), independent soft-start/enable per buck, peak-current-mode control with external compensation, 200 kHz–1.6 MHz adjustable switching frequency, and thermal performance in the 32-pin HTSSOP (DAP) package.
Technical Context
The TPS65279VDAPR implements constant-frequency peak-current-mode control with cycle-by-cycle overcurrent protection and hiccup-mode fault recovery. Each buck uses dedicated COMP pins for loop compensation and SS pins for soft-start/voltage tracking, enabling robust transient response and monotonic startup into pre-biased loads.
Its I²C interface (100 kHz standard / 400 kHz fast mode) supports bidirectional communication: writing VID, enable/disable states, pulse-skipping mode, and reading back power-good status and die temperature warnings. The MODE pin configures forced PWM, PSM, or current-sharing modes-enabling flexible system-level power management without firmware dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports common intermediate bus voltages (9 V, 12 V, 15 V) and battery chemistries without external regulators. |
| Output Current per Channel | Up to 5 A continuous - sufficient for core logic or memory rails in display and multimedia SoCs. |
| Output Voltage Range & Resolution | 0.68 V to 1.95 V in 10-mV steps - enables fine-grained voltage scaling for dynamic power management (DVFS). |
| Switching Frequency | 200 kHz to 1.6 MHz - set by external ROSC resistor; allows optimization of size (higher fSW) vs. efficiency (lower fSW). |
| I²C Interface Speed | Up to 400 kHz fast mode - enables rapid VID updates during runtime voltage transitions. |
| Thermal Resistance (θJA) | 35 °C/W (HTSSOP DAP) - validated on JEDEC high-K board; requires thermal pad soldering and multiple vias for full 5-A operation. |
| Protection Features | Cycle-by-cycle overcurrent, hiccup-mode recovery, overtemperature (160 °C trip), and BOOT-LX UVLO (2.1 V) - ensures safe operation under short-circuit and thermal overload. |
Pinout & Package
TPS65279VDAPR is housed in a 32-pin thermally enhanced HTSSOP (DAP) package with exposed power pad. Thermal pad must be soldered to PCB ground plane with ≥6 thermal vias for reliable 5-A/channel operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | Each controls one buck; internal pull-up allows auto-start; UVLO threshold adjustable via external resistors. |
| FB1 / FB2 | Feedback sensing inputs | Accept external resistor dividers for initial startup; switch to internal VID DAC after I²C command. |
| VOUT1 / VOUT2 | Output voltage sense points | Direct connection to output rail; used for I²C-readback voltage monitoring and PGOOD generation. |
| SS1 / SS2 | Soft-start / tracking inputs | Capacitor-controlled ramp rate; supports power sequencing and voltage tracking across rails. |
| COMP1 / COMP2 | Error amplifier compensation outputs | Connect RC network for loop stability; critical for transient response tuning in each buck's feedback path. |
| LX1 / LX2 | Switching nodes | High dv/dt nodes; require tight layout with low-inductance paths to PVIN and PGND for EMI control. |
| BST1 / BST2 | Bootstrap supply terminals | Connect ceramic capacitor to LX; enables high-side FET gate drive; monitored for BOOT-LX UVLO. |
| ROSC | Oscillator frequency programming | Resistor-to-ground sets switching frequency; also accepts external clock for synchronization. |
| SDA / SCL | I²C data and clock | Standard open-drain interface; supports multi-device addressing via ADDR pin (0x60–0x62). |
| MODE | Operation mode select | GND = forced PWM; open = PSM; V7V = current sharing - no firmware required for basic mode selection. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase dual-buck operation | Reduces input capacitance requirements by ~50% and lowers RMS input ripple current, easing EMI filter design. |
| I²C-controlled 7-bit VID with 10-mV steps | Enables precise, software-defined voltage scaling for DVFS in SoC applications without external DACs or resistors. |
| Independent soft-start and enable per channel | Allows staggered power-up sequencing and individual rail control-critical for complex display timing controllers (TCON). |
| Pulse-skipping mode (PSM) selectable via I²C or MODE pin | Improves light-load efficiency below ~10% load without requiring host processor intervention. |
| Integrated V7V LDO (6.3 V, 200 mA) | Provides stable gate-drive bias for internal MOSFETs; eliminates need for external bias supply and reduces BOM count. |
| Current-sharing capability (up to 10 A) | Paralleling both bucks via MODE = V7V reduces per-phase current stress and improves thermal distribution in high-power rails. |
Applications
| DTV Power Management | TCON Supply |
|---|---|
|
Use Scenario: Dual-rail power for digital TV main SoC and video processing unit requiring independent 1.2 V and 3.3 V supplies with coordinated sequencing. IC Role / Device Role / Timing Role: Primary dual-buck regulator delivering regulated 1.2 V (Buck 1) and 3.3 V (Buck 2); I²C enables dynamic voltage adjustment during content decoding. Use Value: 180° phase shift minimizes input capacitor stress; PSM maintains >85% efficiency at standby load (<100 mA). |
Use Scenario: Powering timing controller ICs in LCD/LED panels where precise 1.8 V and 5 V rails must ramp monotonically with defined delays. IC Role / Device Role / Timing Role: Dual-channel buck with independent SS1/SS2 pins enabling hardware-based voltage tracking and delay-controlled startup. Use Value: External soft-start capacitors allow µs-accurate sequencing; PGOOD signals confirm rail readiness before panel initialization. |
| Tablet PC Core Rail | BDVD System Power |
|
Use Scenario: High-efficiency core voltage supply (0.8 V @ 4.5 A) for ARM-based application processors with dynamic frequency scaling. IC Role / Device Role / Timing Role: Buck 1 configured as primary core rail; VID updated via I²C during CPU frequency transitions; Buck 2 powers DDR termination. Use Value: 10-mV VID resolution enables optimal voltage/frequency binning; 5-A rating supports burst-mode workloads. |
Use Scenario: Dual-rail supply for Blu-ray disc player SoC requiring 1.2 V logic and 3.3 V servo/motor control with fault isolation. IC Role / Device Role / Timing Role: Independent EN1/EN2 pins allow separate enable/disable of logic and motor rails; hiccup-mode OCP prevents latch-up during servo stall. Use Value: Cycle-by-cycle current limiting protects MOSFETs during high-inrush motor startup; thermal shutdown avoids sustained overtemperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65279VRHHR | Same silicon, 36-pin QFN (6 mm × 6 mm) package with θJA = 30.8 °C/W - lower thermal resistance but requires different PCB footprint and reflow profile. | Preferred for space-constrained designs needing higher power density; not drop-in compatible due to pinout and thermal pad layout differences. | Select when thermal margin is critical and board redesign is acceptable; verify layout compatibility with TI's RHH package drawing. |
| TPS65217CRSLR | Single-chip PMIC with dual 3-A bucks + LDOs + battery charger; fixed 0.6–1.52 V outputs; no I²C VID programmability; 2.7–5.5 V input. | Targets portable battery-powered devices (not 12-V bus systems); lacks wide-input range and fine-grained voltage control. | Choose only for low-voltage, battery-integrated applications where I²C programmability and 18-V input are unnecessary. |
Compared with TPS65279VRHHR, the TPS65279VDAPR offers identical electrical performance but trades thermal efficiency for legacy HTSSOP assembly compatibility; compared with TPS65217CRSLR, it provides wider input range, higher current, and I²C-controlled VID essential for fixed-line consumer electronics.
Availability
TPS65279VDAPR is available at Aetrix Electronics and suitable for DTV, TCON, and tablet PC applications requiring stable component supply, long-term industrial availability, and consistent parametric performance across production batches.
Supply support for TPS65279VDAPR 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, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC/DC conversion and automotive-grade reliability.
The TPS65279V product line was designed specifically for mid-power consumer electronics requiring dual, independently controllable buck regulators with I²C configurability and robust thermal performance in cost-sensitive packages.
FAQ
What is the maximum output current per channel for the TPS65279VDAPR?
The TPS65279VDAPR supports up to 5 A continuous output current per buck channel under proper thermal conditions-verified with the 32-pin HTSSOP (DAP) package, adequate PCB copper area, and ≥6 thermal vias to ground. Peak current limit is 7 A per channel, but sustained operation above 5 A requires derating based on ambient temperature and airflow.
Does the TPS65279VDAPR support current sharing between its two buck channels?
Yes, the TPS65279VDAPR supports current sharing up to 10 A total by connecting the MODE pin to V7V. In this configuration, both bucks operate in parallel with synchronized 180° phase shift, enabling balanced current distribution and reduced output ripple. External current-sense resistors are not required-the IC handles current balancing internally.
Can the TPS65279VDAPR operate with a 5-V input supply?
No-the TPS65279VDAPR has a minimum input voltage of 4.5 V, but its V7V LDO requires sufficient headroom to regulate to ~6.3 V for optimal MOSFET gate drive. At VIN = 5 V, V7V drops below specification, degrading high-side FET RDS(on) and efficiency. Operation is only recommended for VIN ≥ 6.5 V to ensure stable V7V and full 5-A capability.
How does the I²C interface of the TPS65279VDAPR handle voltage level translation?
The TPS65279VDAPR's SDA and SCL pins are rated for VIH = 1.3 V and VIL = 0.4 V, compatible with standard 3.3-V I²C buses. No external level shifters are needed when interfacing with 3.3-V microcontrollers. Pull-up resistors (typically 2.2–4.7 kΩ to DVCC) are required on both lines, and bus capacitance must remain ≤400 pF per line for reliable 400-kHz operation.
What is the purpose of the V7V pin on the TPS65279VDAPR?
The V7V pin is the output of an internal low-dropout linear regulator that supplies ~6.3 V (typical) to power the gate drivers and internal control circuits. It must be decoupled with ≥1 µF ceramic capacitor to PGND. Its voltage directly impacts high-side MOSFET conduction loss-lower V7V increases RDS(on), reducing efficiency and thermal margin. V7V cannot be used as a system supply rail.
TPS65279VDAPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-PowerTSSOP (0.240", 6.10mm Width)
- 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:
- 32-HTSSOP
TPS65279VDAPR FAQ
1.How can I place an order for TPS65279VDAPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65279VDAPR 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 TPS65279VDAPR reliable?
The price and inventory of TPS65279VDAPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65279VDAPR is usually 5 days.
3.What payment methods are accepted for TPS65279VDAPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65279VDAPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65279VDAPR?
TPS65279VDAPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65279VDAPR 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 TPS65279VDAPR?
For technical support, including TPS65279VDAPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65279VDAPR requirements.
6.How does Aetrix verify that TPS65279VDAPR is sourced from the original manufacturer or authorized distributors?
All TPS65279VDAPR 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 TPS65279VDAPR meets industry standards.
7.What is the process for return or replacement of TPS65279VDAPR?
All TPS65279VDAPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65279VDAPR, 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 TPS65279VDAPR part is unused and in its original packaging.
Return procedure for TPS65279VDAPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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