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Texas Instruments TPS65581PWPR
- Part No.:
- TPS65581PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS65581PWPR.pdf
- Description:
- IC REG BUCK ADJ TRPL 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,357
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Product details
Overview
TPS65581PWPR from Texas Instruments is a triple synchronous step-down DC/DC converter with 1.5A/2.5A/1.5A output capability per channel, operating from 4.5V to 18V input and delivering adjustable outputs from 0.76V to 7V. It integrates high- and low-side MOSFETs (250mΩ/230mΩ for CH1/CH3; 160mΩ/130mΩ for CH2), uses Advanced D-CAP2™ control for fast transient response without external compensation, and supports ceramic output capacitors in digital TV, STB, and gaming console power supplies.
For engineers reviewing the TPS65581PWPR datasheet, TPS65581PWPR pinout, TPS65581PWPR application, or TPS65581PWPR equivalent, key selection criteria include its triple-channel independent enable control, non-sinking pre-biased soft-start, 700 kHz fixed switching frequency, cycle-by-cycle overcurrent protection, and thermal shutdown at 155°C - all in a thermally enhanced 20-pin HTSSOP package with PowerPAD.
Technical Context
The TPS65581PWPR implements three independent Advanced D-CAP2™ control loops - each combining fixed-frequency PWM operation with adaptive on-time modulation and lossless low-side RDS(on) current sensing. This architecture enables stable regulation with ultra-low-ESR ceramic capacitors while maintaining fast load transient response (e.g., <100 µs recovery for 1.5A step on CH1).
Its Eco-mode™ operation seamlessly transitions into discontinuous conduction mode at light loads, sustaining >85% efficiency down to 1 mA per channel. Protection features are tightly integrated: OVP triggers at 120% VFB, UVP at 68% VFB with 0.5 ms delay, and hiccup-mode overload recovery uses 7×UVP enable delay timing - all monitored per channel with shared thermal shutdown at 155°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide-range industrial and consumer DC inputs 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 asymmetric multi-rail power delivery for SoC core, I/O, and memory domains. |
| Switching Frequency | 700 kHz - balances EMI performance and inductor size; stable across VIN (4.5–18 V) and IOUT (0–full load). |
| Feedback Reference Accuracy | ±1.5% over temperature - ensures tight output voltage regulation (e.g., ±50 mV on 3.3 V rail) without trimming. |
| Soft-Start Time | 1.2 ms internal - prevents inrush current and enables controlled ramp-up of all three outputs simultaneously. |
| Thermal Shutdown Threshold | 155°C with 30°C hysteresis - protects against sustained overload while allowing brief peak-power operation. |
| Power Good Logic | Open-drain PG asserts high only when all three VFBx are within ±16% of target - provides system-level power sequencing validation. |
Pinout & Package
TPS65581PWPR is housed in a 4.4 mm × 6.5 mm 20-pin HTSSOP (PWP) package with exposed thermal pad (PowerPAD™) soldered to PCB ground for optimal thermal dissipation (θJA = 40.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,2) | Power input supply | Common input for all three buck channels and VREG5 LDO; requires local 10 µF ceramic + bulk capacitance. |
| VBST1/2/3 (Pins 3,14,20) | Bootstrap supply for high-side gate drivers | Each connects via 0.1 µF ceramic capacitor to corresponding SWx; internal diode charges from VREG5. |
| SW1/2/3 (Pins 4,15,19) | Switch node | Drain connection of high-side FET and source of low-side FET; critical for layout - minimize loop area with input cap and inductor. |
| PGND1/2/3 (Pins 5,16,18) | Power ground return | Separate low-side FET source returns - must be tied to thermal pad and routed directly to input capacitor ground. |
| VREG5 (Pin 6) | 5.5 V linear regulator output | Supplies internal circuitry and VBSTx; bypass with ≥1 µF ceramic; active only when any ENx is high. |
| PG (Pin 7) | Power good indicator | Open-drain output pulled low if any VFBx falls outside ±16%; 1.5 ms delay after soft-start completion before assertion. |
| EN1/2/3 (Pins 8,13,17) | Channel enable inputs | Active-high logic (2 V threshold); independent control allows staggered startup and dynamic rail management. |
| VFB1/2/3 (Pins 9,11,12) | Feedback inputs | Connect to resistor divider from VOx; 764 mV reference enables precise output setting (e.g., 1.2 V = R1/R2 = 1.27k/2.2k). |
| GND (Pin 10) | Signal ground reference | Return for VFBx and sensitive analog circuitry - tie to PGND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced D-CAP2™ Control | Eliminates need for external compensation components while supporting ceramic, POSCAP, and SP-CAP output capacitors - reduces BOM count and board space. |
| Non-Sinking Pre-Biased Soft Start | Prevents reverse current flow during startup into pre-biased outputs by incrementally enabling low-side FET gate drive - essential for hot-swap and multi-rail sequencing. |
| Loss-Less Low-Side RDS(on) Current Sensing | Enables accurate cycle-by-cycle overcurrent protection without sense resistors - preserves efficiency and avoids additional thermal hotspots. |
| Auto-Skip Eco-mode™ | Maintains >90% efficiency at 10 mA load (CH2 @ 1.2 V) by entering discontinuous conduction mode - extends battery life in standby states. |
| Triple Independent Enable Inputs | Allows flexible power sequencing (e.g., enable CH2 first for core logic, then CH1/CH3 for peripherals) without external logic or microcontroller intervention. |
Applications
| Digital Television Power Supply | Network Home Terminal |
|---|---|
|
Use Scenario: Powers main SoC, DDR memory, and video processing ASIC in 4K UHD TVs requiring clean, sequenced 1.2 V, 1.5 V, and 3.3 V rails. IC Role / Device Role / Timing Role: Triple-output buck controller providing independent, fast-transient-regulated voltages with coordinated soft-start and PG monitoring. Use Value: Eliminates three discrete converters and associated compensation networks - reduces solution size by >35% and improves load-step response time to <50 µs. |
Use Scenario: Supplies broadband gateway platforms with CPU core (1.2 V), PHY interface (1.5 V), and USB/PCIe I/O (3.3 V) under variable line-powered conditions. IC Role / Device Role / Timing Role: Primary multi-rail PMIC managing input ripple rejection, thermal derating, and brown-out coordination across all subsystems. Use Value: Integrated 700 kHz switching and Eco-mode sustain >87% efficiency at 50 mA idle load - cuts standby power by 40% vs. legacy solutions. |
| Digital Set-Top Box (STB) | Gaming Console Core Power |
|
Use Scenario: Delivers regulated power to ARM-based media processors, HDMI transceivers, and flash storage in compact STB enclosures with strict thermal limits. IC Role / Device Role / Timing Role: Central power management IC with independent EN control enabling firmware-driven rail activation and dynamic voltage scaling. Use Value: 1.2 ms soft-start and ±16% PG window ensure reliable boot sequence verification - reduces field failure rate due to undervoltage lockout. |
Use Scenario: Powers GPU and CPU cores in portable gaming devices where burst-mode workloads demand rapid voltage recovery from deep sleep states. IC Role / Device Role / Timing Role: High-efficiency triple buck converter with hiccup-mode overload protection and thermal foldback to prevent throttling during sustained gameplay. Use Value: 160 mΩ/130 mΩ CH2 FETs deliver 2.5 A at <150 mV dropout - maintains 1.2 V core voltage under 2.5 A transient load with <30 mV droop. |
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 output with dual 1-A outputs; uses D-CAP3™ control; 2.2 MHz switching; QFN-22 package. | Higher frequency enables smaller magnetics but increases EMI filtering complexity; lacks independent EN per channel. | Preferred for space-constrained designs needing higher density, but requires revalidation of loop stability and sequencing logic. |
| MP2451DT-LF-Z | Single-channel 0.6 A buck; no integrated FETs; external compensation required; SOIC-8 package. | Requires three separate ICs and six external MOSFETs to match TPS65581PWPR's triple output - significantly increases layout area and component count. | Only suitable for cost-sensitive, low-current applications where integration and thermal performance are secondary. |
Compared with TPS543320RTWR and MP2451DT-LF-Z, the TPS65581PWPR delivers superior integration (three fully independent channels in one package), simpler design (no external compensation), and robust protection (per-channel OVP/UVP + hiccup mode), making it optimal for mid-power consumer electronics where reliability and BOM reduction are critical.
Availability
TPS65581PWPR is available at Aetrix Electronics and suitable for digital TV power supply, network home terminal, and gaming console core power applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS65581PWPR 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 TPS65581PWPR belongs to TI's advanced D-CAP™ multi-output buck converter product line, engineered specifically for high-efficiency, low-noise, and space-constrained consumer electronics power systems.
FAQ
What is the maximum output voltage range supported by the TPS65581PWPR?
The TPS65581PWPR supports an output voltage range of 0.76 V to 7 V per channel, set via external resistor dividers connected to VFB1/VFB2/VFB3 pins. The internal reference voltage is 764 mV with ±1.5% accuracy over temperature, enabling precise regulation - for example, a 1.2 V output is achieved using R1 = 1.27 kΩ and R2 = 2.2 kΩ. The TPS65581PWPR does not support output voltages below 0.76 V or above 7 V.
Does the TPS65581PWPR require external compensation components?
No, the TPS65581PWPR does not require external compensation components thanks to its Advanced D-CAP2™ control architecture. This proprietary topology embeds internal compensation and adapts dynamically to ceramic, POSCAP, and SP-CAP output capacitors - eliminating the need for type-II or type-III compensation networks. Designers can achieve stable operation with just input/output capacitors and inductors per channel, reducing BOM count and layout complexity.
How does the TPS65581PWPR handle pre-biased outputs during startup?
The TPS65581PWPR implements non-sinking pre-biased soft start: when an output is already biased above the target voltage at startup, the controller avoids pulling current from that rail by initially applying narrow low-side FET gate pulses and incrementally increasing on-time until reaching normal CCM operation. This prevents reverse current flow and ensures smooth, glitch-free ramp-up - a critical feature for systems with multiple power domains or hot-swap requirements.
What protections are built into the TPS65581PWPR?
The TPS65581PWPR integrates comprehensive per-channel and system-level protections: overvoltage protection (OVP) triggers at 120% VFB, undervoltage protection (UVP) at 68% VFB with 0.5 ms delay, cycle-by-cycle overcurrent limiting, hiccup-mode overload recovery, thermal shutdown at 155°C (30°C hysteresis), and UVLO on VREG5. All protections are hardware-based and operate independently per channel - no firmware or external supervision required.
Can the TPS65581PWPR be used with ceramic output capacitors?
Yes, the TPS65581PWPR is explicitly optimized for ceramic output capacitors - its Advanced D-CAP2™ control loop remains stable even with ultra-low-ESR ceramics (e.g., X5R/X7R types). The datasheet recommends 22 µF to 68 µF per channel, and typical designs use two parallel 22 µF 0805 ceramics (ESR ≈ 2 mΩ each). This eliminates the need for bulk electrolytic or tantalum capacitors, improving reliability and reducing footprint.
TPS65581PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
TPS65581PWPR FAQ
1.How can I place an order for TPS65581PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65581PWPR 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 TPS65581PWPR reliable?
The price and inventory of TPS65581PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65581PWPR is usually 5 days.
3.What payment methods are accepted for TPS65581PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65581PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65581PWPR?
TPS65581PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65581PWPR 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 TPS65581PWPR?
For technical support, including TPS65581PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65581PWPR requirements.
6.How does Aetrix verify that TPS65581PWPR is sourced from the original manufacturer or authorized distributors?
All TPS65581PWPR 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 TPS65581PWPR meets industry standards.
7.What is the process for return or replacement of TPS65581PWPR?
All TPS65581PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65581PWPR, 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 TPS65581PWPR part is unused and in its original packaging.
Return procedure for TPS65581PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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