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Texas Instruments TPS65581PWP
- Part No.:
- TPS65581PWP
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS65581PWP.pdf
- Description:
- IC REG BUCK ADJ TRPL 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,684
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Product details
Overview
TPS65581PWP from Texas Instruments is a triple synchronous step-down DC/DC converter IC with integrated 1.5A/2.5A/1.5A power stages, Advanced D-CAP2™ control mode, 4.5V–18V input range, and fixed 700 kHz switching frequency-designed for point-of-load regulation in digital TV, STB, and gaming console power supplies.
For engineers reviewing the TPS65581PWP datasheet, TPS65581PWP pinout, TPS65581PWP application, or TPS65581PWP equivalent, this page delivers verified specifications, validated thermal performance (θJA = 40.0°C/W), confirmed channel-specific RDS(on) values, and real-world soft-start and protection behavior critical for multi-rail embedded power design.
Technical Context
The TPS65581PWP implements three independent buck regulators sharing a common VIN and GND infrastructure but featuring separate feedback (VFB1/VFB2/VFB3), enable (EN1/EN2/EN3), and switch-node (SW1/SW2/SW3) paths. Each channel uses thermally compensated low-side RDS(on) current sensing and supports ceramic output capacitors without external compensation.
Its Advanced D-CAP2™ architecture enables seamless PWM-to-Eco-mode transition, delivering high efficiency at light loads while maintaining fast transient response (<10 µs typical) via internal zero placement-validated across all three channels under 10 mA to full-load conditions per TI SLVSC38B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 4.5 V to 18 V - supports wide-input industrial and consumer DC bus systems including 5 V, 12 V, and 15 V rails. |
| Output current capability | CH1: 1.5 A, CH2: 2.5 A, CH3: 1.5 A - enables discrete rail assignment for core logic (CH2), I/O (CH1), and memory (CH3). |
| Switching frequency | 700 kHz fixed - balances EMI control, inductor size, and efficiency across all load conditions. |
| Feedback reference accuracy | 764 mV ±12 mV (±1.6%) - ensures tight output regulation (±16% PG window) without trimming resistors. |
| Thermal shutdown threshold | 155°C with 30°C hysteresis - protects against sustained overload while allowing brief peak-power operation. |
| Soft-start time | 1.2 ms internal - prevents inrush current and ensures monotonic startup even with pre-biased outputs. |
| Power-good delay | 1.5 ms after soft-start completion - avoids false PG assertion during transient settling. |
Pinout & Package
TPS65581PWP is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad soldered to PCB ground plane for optimal heat dissipation (θJCbot = 1.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Main power input | Supplies all three channels and powers internal 5.5 V LDO (VREG5); requires local 10 µF ceramic decoupling. |
| SW1/SW2/SW3 (Pins 4,15,19) | Switch node | Connects to external inductors; carries high di/dt; must be routed with minimal loop area to reduce EMI. |
| PGND1/PGND2/PGND3 (Pins 5,16,18) | Power ground return | Low-side MOSFET source returns; must be connected to local power ground planes, not signal ground. |
| VFB1/VFB2/VFB3 (Pins 9,11,12) | Feedback input | Resistor-divider tap point for output voltage setting; high-impedance node requiring clean routing near GND. |
| EN1/EN2/EN3 (Pins 8,13,17) | Enable control | CMOS-compatible inputs (VENH = 2 V, VENL = 0.4 V); allow independent sequencing of each output rail. |
| PG (Pin 7) | Open-drain power-good | Asserts high only when all three outputs are within ±16% of target; requires external pull-up resistor. |
| GND (Pin 10) | Signal ground reference | Reference for VFBx and analog circuitry; must be star-connected to PGND at single point to avoid noise coupling. |
| Exposed Thermal Pad | Thermal and electrical ground | Must be soldered to large copper pour tied to system ground; essential for thermal reliability above 1.5 A/channel. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced D-CAP2™ control | Eliminates external compensation components and enables stable operation with ultra-low-ESR ceramic capacitors (down to 2 mΩ). |
| Non-sinking pre-biased soft start | Prevents reverse current flow during startup into pre-charged outputs-critical for hot-swap and multi-rail sequencing. |
| Thermally compensated OCP | Current limit remains stable over temperature (4000 ppm/°C RDS(on) tracking), avoiding premature foldback at elevated junction temps. |
| Auto-Skip Eco-mode™ | Boosts light-load efficiency to >85% at 10 mA (VIN = 12 V) by skipping pulses while preserving regulation accuracy. |
| Hiccup-mode overload protection | Shuts down for 7×UVP-enable-delay (≈19.6 ms) on sustained overcurrent, limiting average power dissipation and junction temperature rise. |
Applications
| Digital Television Power Supply | Networking Home Terminal |
|---|---|
|
Use Scenario: Powers SoC core (1.2 V), DDR memory interface (1.5 V), and HDMI PHY (3.3 V) from a 12 V DC bus. IC Role / Device Role / Timing Role: Triple-output PMIC providing independent, sequenced, and monitored DC rails for multimedia subsystems. Use Value: Reduces BOM count by replacing three discrete buck converters; achieves <10 µs load transient recovery on 2.5 A CH2 rail per TI test data. |
Use Scenario: Supplies CPU (1.2 V), USB controller (3.3 V), and Ethernet PHY (1.5 V) in residential gateway devices. IC Role / Device Role / Timing Role: Integrated power management IC enabling compact, thermally efficient 4-layer PCB layout. Use Value: Delivers >90% peak efficiency at full load (VIN = 12 V) and maintains >80% efficiency at 10 mA-extending standby runtime. |
| Digital Set Top Box (STB) | Gaming Console Mainboard |
|
Use Scenario: Generates 1.2 V for ARM processor, 3.3 V for tuner and demodulator, and 1.5 V for DDR2 memory in cable/satellite receivers. IC Role / Device Role / Timing Role: Multi-channel synchronous buck regulator with independent EN control for power sequencing compliance. Use Value: Supports non-sinking soft start to prevent backfeed into powered-up peripherals during cold boot. |
Use Scenario: Provides GPU core (1.2 V), I/O (3.3 V), and memory (1.5 V) rails in portable and home gaming hardware. IC Role / Device Role / Timing Role: High-current triple buck converter with thermal shutdown and hiccup-mode fault handling. Use Value: Enables robust operation under burst-load conditions (e.g., GPU frame rendering) with validated 155°C thermal cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543320RTWR | Single 3-A buck with dual 1-A bucks; higher integration but no independent EN per channel; 2.95–17 V input. | Lacks per-channel enable and soft-start control-unsuitable for strict power sequencing requirements. | Select when board space is constrained and rail independence is secondary to footprint reduction. |
| MP2451DT-LF-Z | Single-channel 0.6 A buck; requires three separate ICs to match TPS65581PWP's triple output capability. | Increases component count, layout complexity, and thermal management overhead across three packages. | Consider only for low-cost, low-power designs where total solution size is less critical than unit cost. |
Compared with TPS543320RTWR and MP2451DT-LF-Z, the TPS65581PWP uniquely delivers true per-channel enable, independent feedback, and validated 2.5 A capability in one thermally optimized HTSSOP package-making it the only choice for space-constrained, multi-rail consumer electronics requiring precise sequencing and robust overload protection.
Availability
TPS65581PWP is available at Aetrix Electronics and suitable for digital TV, STB, and gaming console power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized TI distribution channels.
Supply support for TPS65581PWP 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 TPS65581PWP belongs to TI's advanced D-CAP2™ synchronous buck converter product line, engineered specifically for high-efficiency, low-component-count, multi-rail power solutions in consumer electronics with stringent thermal and transient performance requirements.
FAQ
What is the maximum ambient temperature rating for the TPS65581PWP?
The TPS65581PWP is specified for operation from –40°C to +85°C ambient temperature. Its thermal design supports junction temperatures up to 150°C, enabled by the exposed PowerPAD™ and θJA = 40.0°C/W in the HTSSOP-20 package. Derating is required above 85°C ambient per TI SLVSC38B Section 6.5.
Does the TPS65581PWP support independent power sequencing between its three output channels?
Yes, the TPS65581PWP supports full independent sequencing via dedicated EN1, EN2, and EN3 pins. Each channel features its own 1.2 ms internal soft-start and non-sinking pre-biased startup, allowing staggered turn-on and safe hot-plug operation-confirmed in TI's functional block diagram and startup timing figures.
What output capacitor types are validated for use with the TPS65581PWP?
The TPS65581PWP is validated for ceramic, POSCAP, and SP-CAP output capacitors with ESR as low as 2 mΩ. TI explicitly states compatibility with ultra-low-ESR ceramics and provides recommended values (22–68 µF) in Table 1 of SLVSC38B-no external compensation is needed due to Advanced D-CAP2™ architecture.
How does the TPS65581PWP handle overcurrent events on individual channels?
The TPS65581PWP implements cycle-by-cycle valley-current limiting per channel using thermally compensated low-side RDS(on) sensing. Sustained overcurrent triggers hiccup-mode shutdown (7×UVP-enable-delay), protecting the IC while limiting average power dissipation-detailed in Sections 7.3.12 and 7.3.13 of SLVSC38B.
Is the TPS65581PWP pin-compatible with other members of the TPS655xx family?
No, the TPS65581PWP is not pin-compatible with other TPS655xx variants such as TPS65580 or TPS65582. Pin functions-including VBSTx assignments, PGND distribution, and EN placement-are unique to the TPS65581PWP per its HTSSOP-20 pinout diagram in Section 8.2 of SLVSC38B.
TPS65581PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.764V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 1.5A, 2.5A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
TPS65581PWP FAQ
1.How can I place an order for TPS65581PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65581PWP 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 TPS65581PWP reliable?
The price and inventory of TPS65581PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65581PWP is usually 5 days.
3.What payment methods are accepted for TPS65581PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65581PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65581PWP?
TPS65581PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65581PWP 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 TPS65581PWP?
For technical support, including TPS65581PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65581PWP requirements.
6.How does Aetrix verify that TPS65581PWP is sourced from the original manufacturer or authorized distributors?
All TPS65581PWP 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 TPS65581PWP meets industry standards.
7.What is the process for return or replacement of TPS65581PWP?
All TPS65581PWP units undergo pre-shipment inspection (PSI). If there is an issue with TPS65581PWP, 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 TPS65581PWP part is unused and in its original packaging.
Return procedure for TPS65581PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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