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Texas Instruments TPS65270PWPR
- Part No.:
- TPS65270PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS65270PWPR.pdf
- Description:
- IC REG BCK ADJ 2A/3A DL 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,497
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Product details
Overview
TPS65270PWPR from Texas Instruments is a dual synchronous step-down DC-DC regulator IC integrating two high-efficiency buck converters with independent enable, soft-start, and compensation. It operates from 4.5 V to 18 V input, delivers up to 2 A on Buck 1 and 3 A on Buck 2, features 0.8 V ±1% reference accuracy, 300 kHz–1.4 MHz adjustable switching frequency, and 180° out-of-phase operation for reduced input ripple - used in set-top boxes and home gateways for multi-rail power delivery.
For engineers reviewing the TPS65270PWPR datasheet, TPS65270PWPR pinout, TPS65270PWPR application, or TPS65270PWPR equivalent, key selection considerations include per-channel current capability (2 A / 3 A), independent EN/SS pins for sequencing, peak-current-mode control with external Type II compensation, thermal shutdown at 160°C, and HTSSOP-24 package thermal pad requirements.
Technical Context
The TPS65270PWPR implements constant-frequency peak-current-mode control per channel, enabling fast transient response and simplified loop compensation via external RC networks on COMP1/COMP2. Each converter integrates high-side and low-side MOSFETs (RDS(on) = 120 mΩ / 80 mΩ for Buck 1; 95 mΩ / 50 mΩ for Buck 2) and supports prebiased startup.
It features dedicated analog ground (AGND) and power ground (GND) separation, 180° phase-shifted operation between channels to minimize input capacitor RMS current, and programmable PSM/PWM mode via LOW_P pin - allowing light-load efficiency optimization without sacrificing regulation stability under dynamic load steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports 5 V, 9 V, 12 V, and 15 V bus supplies and battery chemistries without external regulators. |
| Output Current Capability | Buck 1: 2 A continuous; Buck 2: 3 A continuous - enables independent powering of CPU core (1.2 V/3 A) and I/O (1.8 V/2 A) rails. |
| Reference Voltage Accuracy | 0.8 V ±1% (25°C), ±2% (–40°C to 125°C) - ensures tight output regulation across temperature for stable SoC operation. |
| Switching Frequency Range | 300 kHz to 1.4 MHz - set by external ROSC resistor; allows trade-off between efficiency (lower fSW) and size (higher fSW). |
| Thermal Shutdown Threshold | 160°C trip, 20°C hysteresis - protects against sustained overload or poor PCB thermal design; resumes after die cools to 140°C. |
| UVLO Threshold | Rising: 4.2 V typical; Falling: 3.85 V typical - prevents erratic startup/shutdown during brownout conditions. |
| Quiescent Current (Shutdown) | 10 µA - minimizes system standby power when both channels disabled via EN1/EN2. |
Pinout & Package
TPS65270PWPR is housed in a 24-pin thermally enhanced HTSSOP (PWP) package (7.80 mm × 4.40 mm) with exposed thermal pad requiring soldering and thermal vias for optimal junction-to-board thermal resistance (RθJB = 22.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2 | Dedicated enable inputs | Logic-high (>1.55 V) activates respective buck channel; internal 1-MΩ pullup enables auto-start if left floating. |
| SS1, SS2 | Soft-start timing inputs | 5-µA internal current source charges external capacitor; 4.7 nF yields ~800 µs ramp time to limit inrush current. |
| FB1, FB2 | Feedback voltage sense inputs | Monitor output divider; regulate to 0.8 V reference - enables precise 1.2 V, 1.8 V, 3.3 V, or 5 V outputs with 1% resistors. |
| BST1, BST2 | Bootstrap supply outputs | Drive high-side MOSFET gates; require 47-nF ceramic caps from BSTx to LXx for proper gate drive voltage generation. |
| COMP1, COMP2 | Loop compensation outputs | Interface with external Type II network (RC + C) to stabilize control loop and achieve >100 kHz crossover frequency. |
| ROSC | Oscillator frequency programming | Resistor to GND sets fSW; e.g., 250 kΩ → ~1 MHz, 500 kΩ → ~500 kHz - directly impacts EMI filtering and inductor size. |
| LOW_P | Low-power mode control | High = pulse-skipping mode for light-load efficiency; low = forced PWM for consistent noise spectrum and transient response. |
| VIN1, VIN2 | Independent input supplies | Accept separate input sources or shared rail; each requires local 10-µF ceramic decoupling close to pin. |
| LX1, LX2 | Switching node outputs | Connect to external inductors (e.g., 4.7 µH); high dv/dt nodes requiring short, low-inductance PCB traces. |
| GND, AGND | Power and analog ground returns | Must be connected together at single point near thermal pad; AGND provides clean reference for feedback and error amplifier. |
| VCC | Internal LDO bias supply | 6.5-V regulated output; requires 10-µF ceramic cap to GND - powers internal circuitry and can supply MCU standby loads. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel enable and soft-start | Enables flexible power sequencing (e.g., Buck 2 powers SoC before Buck 1 enables memory rail) and eliminates input surge during startup. |
| 180° out-of-phase operation | Reduces input ripple current amplitude by ~50%, allowing smaller input bulk capacitors and lower EMI filter component count. |
| Integrated high- and low-side MOSFETs | Eliminates need for external FETs and drivers; Rdson_HS1/Rdson_LS1 = 120 mΩ/80 mΩ enables >90% efficiency at 1.8 V/2 A (12 VIN). |
| Prebiased output startup | Allows safe startup into precharged output (e.g., hot-swap or backup rail scenarios) without reverse current or latch-up risk. |
| Cycle-by-cycle overcurrent protection | Detects peak inductor current exceeding 3.2 A (Buck 1) or 4.1 A (Buck 2); triggers hiccup mode on persistent fault to limit MOSFET power dissipation. |
Applications
| Set-Top Box Power Management | Home Gateway Router |
|---|---|
Use Scenario: Dual-rail power for SoC (1.2 V core, 1.8 V I/O) and peripheral interfaces (3.3 V USB, 5 V Ethernet PHY) in compact consumer enclosure. IC Role / Device Role / Timing Role: Primary dual-buck regulator providing isolated, sequenced, and regulated DC outputs from 12 V wall adapter. Use Value: 180° phase shift cuts input capacitor RMS current by half, reducing 12 V input bulk cap size from 47 µF to 22 µF while maintaining <100 mV ripple. | Use Scenario: Powering Wi-Fi baseband processor, RF front-end, and PoE controller in residential broadband gateway with thermal constraints. IC Role / Device Role / Timing Role: Central PMIC delivering 1.1 V/2 A (CPU), 3.3 V/1 A (RF), and 5 V/0.5 A (PoE interface) from 15 V DC input. Use Value: Independent EN/SS pins allow staggered startup to avoid 15 V supply sag; PSM mode maintains >85% efficiency at 50 mA standby load. |
| Car DVD Player System | DSL/Cable Modem |
Use Scenario: Automotive infotainment unit requiring robust 12 V battery input handling with cold-crank (4.5 V) and load-dump (18 V) tolerance. IC Role / Device Role / Timing Role: Main DC-DC converter generating 1.2 V (DSP), 1.8 V (memory), and 3.3 V (display interface) rails with UVLO hysteresis. Use Value: 4.2 V UVLO rising threshold and 20°C thermal hysteresis prevent cycling during engine cranking or ambient temperature swings. | Use Scenario: Multi-service modem supporting DOCSIS 3.0 and VoIP, needing reliable dual-output power under variable line conditions. IC Role / Device Role / Timing Role: Dual-buck regulator supplying 1.2 V/3 A (QAM demodulator) and 3.3 V/2 A (PHY interface) from 12 V SMPS. Use Value: Adjustable fSW lets designers select 625 kHz for optimal efficiency or 1.15 MHz to shrink inductors and fit within 2-layer PCB height limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65271PWPR | Same pinout and electrical specs, but adds integrated LDO (3.3 V/200 mA) and power-good signals; higher quiescent current (1.2 mA vs 1 mA non-switching). | Required when system needs auxiliary LDO rail or power-status monitoring; not drop-in if LDO unused due to extra BOM cost. | Select TPS65271PWPR only if auxiliary 3.3 V LDO or PG assertion is needed; otherwise TPS65270PWPR offers lower IQ and simpler layout. |
| MP2491DS-LF-Z | Monolithic dual buck (2.5 A/3.5 A), 4.5–18 V input, but no independent EN/SS pins, fixed 500 kHz fSW, and no PSM mode - uses voltage-mode control. | Suitable for cost-sensitive, non-sequencing applications where fixed frequency and simpler compensation are acceptable. | Choose MP2491DS-LF-Z for basic dual-rail needs without sequencing or light-load efficiency demands; avoid if soft-start timing or PSM is required. |
Compared with TPS65270PWPR, TPS65271PWPR adds integrated LDO and PG signaling at higher IQ, while MP2491DS-LF-Z sacrifices sequencing flexibility and light-load efficiency for lower cost and simpler design - making TPS65270PWPR optimal for systems needing per-rail control and adaptive efficiency.
Availability
TPS65270PWPR is available at Aetrix Electronics and suitable for set-top boxes, home gateways, car DVD players, DSL modems, and cable modems requiring stable component supply across industrial temperature range and long production lifecycles.
Supply support for TPS65270PWPR 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 technologies with over 90 years of innovation in high-reliability power conversion solutions.
The TPS65270 product line delivers highly integrated dual-buck regulators for consumer and industrial applications demanding compact, efficient, and sequenced multi-rail power - designed specifically for space-constrained DTV, networking, and automotive infotainment systems.
FAQ
What is the maximum continuous output current supported by each channel of the TPS65270PWPR?
The TPS65270PWPR supports up to 2 A continuous output current on Buck 1 and up to 3 A continuous output current on Buck 2 under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Peak inductor current limits are 3.2 A (Buck 1) and 4.1 A (Buck 2), but sustained operation above rated current risks thermal shutdown or reduced reliability. Derating is advised above 85°C ambient.
How does the TPS65270PWPR achieve high light-load efficiency?
The TPS65270PWPR achieves high light-load efficiency through its pulse-skipping mode (PSM), activated when the LOW_P pin is pulled high. In PSM, the device skips switching cycles when output current falls below a threshold, reducing switching losses and quiescent power draw. This enables >85% efficiency at 50 mA load (12 VIN → 1.2 V/3 A rail), versus ~70% in forced PWM mode.
Can the TPS65270PWPR start up into a prebiased output voltage?
Yes, the TPS65270PWPR supports prebiased startup: it begins switching only after the FB pin voltage reaches the precharged output level, preventing reverse current flow through the low-side MOSFET. This avoids output voltage collapse or damage during hot-swap, backup rail switchover, or system-level power sequencing events - confirmed in Section 8.1 and Figure 13 of the datasheet.
What is the purpose of the AGND pin on the TPS65270PWPR, and how should it be connected?
AGND is the analog ground reference for the error amplifiers, feedback comparators, and internal reference circuits. It must be connected to the main power ground (GND) at a single point near the thermal pad to avoid noise coupling. Separating AGND from noisy power return paths ensures stable 0.8 V reference accuracy and prevents oscillation in the compensation network tied to COMP1/COMP2.
Does the TPS65270PWPR require external MOSFETs, or are they integrated?
The TPS65270PWPR integrates both high-side and low-side power MOSFETs for each buck channel - no external FETs are required. RDS(on) values are 120 mΩ / 80 mΩ (Buck 1) and 95 mΩ / 50 mΩ (Buck 2) at nominal conditions. This integration reduces solution size, simplifies layout, and improves efficiency versus controllers requiring external FETs - a key differentiator versus buck controller ICs like TPS40210.
TPS65270PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-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:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2A, 3A
- Frequency - Switching:
- 300kHz ~ 1.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TPS65270PWPR FAQ
1.How can I place an order for TPS65270PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS65270PWPR 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 TPS65270PWPR reliable?
The price and inventory of TPS65270PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS65270PWPR is usually 5 days.
3.What payment methods are accepted for TPS65270PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS65270PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS65270PWPR?
TPS65270PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS65270PWPR 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 TPS65270PWPR?
For technical support, including TPS65270PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS65270PWPR requirements.
6.How does Aetrix verify that TPS65270PWPR is sourced from the original manufacturer or authorized distributors?
All TPS65270PWPR 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 TPS65270PWPR meets industry standards.
7.What is the process for return or replacement of TPS65270PWPR?
All TPS65270PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS65270PWPR, 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 TPS65270PWPR part is unused and in its original packaging.
Return procedure for TPS65270PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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