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Texas Instruments TPS54526RSAR
- Part No.:
- TPS54526RSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS54526RSAR.pdf
- Description:
- IC REG BUCK ADJ 5.5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,975
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Product details
Overview
TPS54526RSAR from Texas Instruments is a 5.5-A synchronous step-down DC/DC converter with D-CAP2™ control, Eco-mode™ for light-load efficiency, 650-kHz switching frequency, and integrated 63-mΩ high-side / 33-mΩ low-side MOSFETs. It delivers regulated output from 0.76 V to 5.5 V across 4.5–18 V input, used in digital TV power supplies and Blu-ray player main rails.
For engineers reviewing the TPS54526RSAR datasheet, TPS54526RSAR pinout, TPS54526RSAR application, or TPS54526RSAR equivalent, key selection considerations include adaptive on-time transient response, pre-biased soft-start capability, power-good signaling, ceramic-capacitor compatibility, and thermal shutdown at 165°C.
Technical Context
The TPS54526RSAR implements adaptive on-time D-CAP2™ control-no external compensation required-enabling fast load-transient response via internal ramp injection and pseudo-fixed 650-kHz operation. Its valley-current OCP monitors low-side FET voltage during conduction to deliver cycle-by-cycle overcurrent protection.
Eco-mode™ enables automatic PWM-to-pulse-skipping transition below ~1 A load, reducing quiescent current to <10 µA in shutdown. The device integrates dual PGND pins, three VIN inputs, two SW nodes, and a dedicated VREG5 5.5-V LDO (±3% regulation, 5-mA max load) for internal bias and external use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide industrial and consumer DC bus inputs including 5 V, 12 V, and 15 V rails. |
| Output Current | 5.5 A continuous - sufficient for powering SoCs, FPGAs, and DDR memory subsystems in embedded systems. |
| Switching Frequency | 650 kHz typical - balances EMI performance, inductor size, and efficiency in compact layouts. |
| High-Side RDS(on) | 63 mΩ at 25°C - minimizes conduction loss at high duty cycles (e.g., 3.3 V out from 12 V in). |
| Low-Side RDS(on) | 33 mΩ at 25°C - reduces synchronous rectification loss and improves light-load efficiency. |
| Feedback Reference | 765 mV ±1.5 mV - enables precise output regulation with 1% resistor dividers and supports 0.76–5.5 V programming. |
| Shutdown Current | ≤10 µA - ensures ultra-low system standby power in always-on applications like set-top boxes. |
| Thermal Shutdown | 165°C threshold with 35°C hysteresis - protects against sustained overload or poor heatsinking without latch-up. |
Pinout & Package
The TPS54526RSAR is housed in a 16-pin QFN package (4.0 mm × 4.0 mm, 0.5-mm pitch) with exposed thermal pad soldered to PGND for optimal thermal dissipation (RθJA = 35.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VO | Output voltage sense & discharge node | Connects directly to output rail; internal 50-Ω discharge FET activates when EN = low to prevent floating output. |
| VFB | Feedback input | Monitors resistor-divider output voltage; 765-mV reference sets regulation point; ±0.15-µA input bias minimizes divider error. |
| VREG5 | Internal 5.5-V LDO output | Supplies internal circuitry and can power external bias rails; requires 1-µF ceramic capacitor to PGND; disabled when EN = low. |
| SS | Soft-start timing control | 6-µA current source charges external capacitor; start time programmable per tSS = 1.1 × CSS × 0.765 / 6 µA; supports pre-biased startup. |
| PG | Open-drain power-good signal | Asserts high after 1.7× soft-start time when VOUT is within ±10%; sinks up to 5 mA; requires external pull-up to VREG5 (25–150 kΩ). |
| EN | Enable input | Active-high logic input; 1.6-V threshold; internal 440-kΩ pull-down ensures default disable; compatible with 1.8-V/3.3-V GPIO. |
| VIN1–VIN3 | Power input terminals | Three independent VIN pins reduce PCB trace resistance and improve current sharing; all connect internally to high-side FET drains and VREG5 input. |
| SW1–SW2 | Switch node outputs | Connect to external inductors; each drives one phase of internal dual-NFET half-bridge; require local ceramic bootstrap capacitors to VBST. |
| VBST | Bootstrap supply for high-side gate driver | Internally diode-connected to VREG5; external capacitor from VBST to SW1/SW2 provides gate drive voltage > VIN. |
| PGND1–PGND2 | Power ground returns | Dedicated low-side FET source connections and current-sense inputs; must be tied to GND near IC with low-inductance layout. |
| GND | Signal ground reference | Reference for feedback, soft-start, enable, and PG circuits; separate from PGND but connected locally to minimize noise coupling. |
| PowerPAD™ | Thermal and electrical ground | Exposed copper pad on package underside; must be soldered to large PGND copper area for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Eliminates external compensation components while delivering sub-10-µs load transient response for CPU/GPU core rails. |
| Eco-mode™ auto-skip operation | Reduces light-load switching losses by entering pulse-skipping mode below ~1 A, maintaining >85% efficiency at 10-mA output. |
| Pre-biased soft-start | Prevents reverse current flow during startup into pre-charged outputs-critical for hot-swap and multi-rail sequencing applications. |
| Ceramic capacitor support | Proprietary internal circuitry stabilizes control loop with ultra-low-ESR ceramic output caps, eliminating need for bulk electrolytics. |
| Integrated VREG5 LDO | Provides regulated 5.5-V bias for internal logic and external circuitry; eliminates need for discrete 5-V regulator in auxiliary power tree. |
| Output discharge function | Activates internal 50-Ω VO-to-PGND FET during shutdown or fault, ensuring rapid, controlled output voltage decay per safety requirements. |
Applications
| Digital TV Power Supply | Blu-ray Disc™ Player Main Rail |
|---|---|
Use Scenario: Powers SoC, video decoder, and HDMI interface in 4K UHD television platforms requiring tight voltage tolerance and low ripple. IC Role / Device Role / Timing Role: Primary 1.05-V or 1.2-V core regulator delivering up to 5.5 A with <7-mVPP ripple at full load. Use Value: D-CAP2™ control maintains regulation during dynamic video processing loads; Eco-mode™ cuts standby power to meet Energy Star Tier 2 requirements. | Use Scenario: Supplies 3.3-V and 1.8-V rails to optical pickup controller, servo motor driver, and NAND flash in high-definition disc players. IC Role / Device Role / Timing Role: Dual-output capable via cascaded configuration; handles bursty servo current demands with minimal output droop. Use Value: Pre-biased soft-start prevents glitch on shared 3.3-V bus during disc tray insertion; 650-kHz switching avoids audible noise in audio-sensitive environments. |
| Networking Home Terminal | Digital Set-Top Box (STB) |
Use Scenario: Delivers 1.1-V CPU core and 1.8-V I/O rails in DOCSIS 3.1 cable modems and fiber gateways with strict thermal constraints. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 12-V intermediate bus; manages thermal rise in sealed plastic enclosures. Use Value: 35.2°C/W θJA and thermal shutdown at 165°C enable reliable operation at 70°C ambient; VREG5 powers Ethernet PHY bias. | Use Scenario: Regulates 1.0-V DDR3 memory and 3.3-V tuner supply in pay-TV STBs where EMI compliance and long-term reliability are critical. IC Role / Device Role / Timing Role: Primary point-of-load converter with power-good sequencing for FPGA-based demodulator and conditional access modules. Use Value: PG signal coordinates safe boot sequence; ceramic-capacitor compatibility reduces board area and improves MTBF vs. electrolytic alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54528RSAR | Same pinout and footprint; higher 6-A rating; improved thermal performance (RθJA = 32.1°C/W); identical D-CAP2™/Eco-mode™ architecture. | Preferred for designs requiring margin above 5.5 A or extended ambient temperature operation up to 105°C. | Select TPS54528RSAR when peak load exceeds 5.5 A or when derating for 105°C ambient is required. |
| MP2359DJ-LF-Z | Monolithic 5-A buck; 4.5–28-V input; fixed 500-kHz fSW; no VREG5 output or pre-biased soft-start; uses voltage-mode control with external compensation. | Suitable for cost-sensitive, non-sequencing applications where 5-V bias and pre-bias startup are not needed. | Choose MP2359DJ-LF-Z only if VREG5, PG, and pre-biased start are unnecessary and layout space allows for compensation network. |
Compared with TPS54526RSAR, TPS54528RSAR offers higher current headroom and better thermal metrics in identical packaging, while MP2359DJ-LF-Z trades advanced features for lower BOM count and cost-making it viable only where those features are unused.
Availability
TPS54526RSAR is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player main rails, and networking home terminals requiring stable component supply, long-lifecycle assurance, and TI-qualified automotive-grade traceability.
Supply support for TPS54526RSAR 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 TPS54526RSAR belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-efficiency, low-component-count DC/DC regulation in space-constrained consumer and industrial electronics.
FAQ
What is the recommended input capacitor configuration for TPS54526RSAR?
TI recommends using a minimum 47-µF low-ESR ceramic or polymer capacitor placed close to the VIN1–VIN3 pins, supplemented by 10-µF X7R ceramics for high-frequency decoupling. Total input capacitance should exceed 60 µF to limit input ripple below 50 mVPP at 5.5-A load. The TPS54526RSAR datasheet specifies that input voltage drop during high di/dt events must stay within ±100 mV of nominal to ensure stable VREG5 operation and avoid UVLO triggering.
Does TPS54526RSAR support forced PWM mode, or is Eco-mode™ mandatory?
The TPS54526RSAR does not support forced PWM mode-it operates exclusively in auto-skip Eco-mode™, transitioning seamlessly between PWM and pulse-skipping based on load current. This behavior is inherent to its D-CAP2™ architecture and cannot be disabled. At loads above ~1 A, it runs in continuous conduction mode with 650-kHz switching; below that threshold, it skips pulses to maintain high efficiency without external control.
How is the soft-start time calculated for TPS54526RSAR?
The soft-start time for TPS54526RSAR is calculated as tSS = 1.1 × CSS × 0.765 V / 6 µA, where CSS is the capacitor value (in farads) connected from SS to GND. For example, a 100-nF capacitor yields tSS ≈ 14 ms. This linear ramp controls the internal reference voltage, ensuring monotonic output voltage rise and preventing inrush current-critical for TPS54526RSAR's use in multi-rail systems with strict sequencing requirements.
Can TPS54526RSAR safely drive ceramic output capacitors without external compensation?
Yes, TPS54526RSAR is specifically designed to operate stably with ceramic output capacitors-including ultra-low-ESR types-without external compensation. Its D-CAP2™ control loop incorporates an internal ramp generator that synthesizes artificial ripple, eliminating dependence on capacitor ESR for loop stability. This allows full use of small, high-reliability 10–100-µF X7R/X5R ceramics instead of larger, failure-prone electrolytics-verified across all operating conditions in the TPS54526RSAR production test plan.
What is the maximum allowable output voltage ripple for TPS54526RSAR under full load?
The TPS54526RSAR is characterized to maintain ≤7 mVPP output voltage ripple at 5.5-A load with 12-V input, per the typical application design in the official datasheet. Achieving this requires proper layout (short, low-inductance power loops), recommended LC filter values (e.g., 22–68 µH inductor + ≥100 µF ceramic output capacitance), and adherence to TI's layout guidelines-including solid PGND plane under the PowerPAD™ and minimized VFB trace length.
TPS54526RSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.76V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 5.5A
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
TPS54526RSAR FAQ
1.How can I place an order for TPS54526RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54526RSAR 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 TPS54526RSAR reliable?
The price and inventory of TPS54526RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54526RSAR is usually 5 days.
3.What payment methods are accepted for TPS54526RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54526RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54526RSAR?
TPS54526RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54526RSAR 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 TPS54526RSAR?
For technical support, including TPS54526RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54526RSAR requirements.
6.How does Aetrix verify that TPS54526RSAR is sourced from the original manufacturer or authorized distributors?
All TPS54526RSAR 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 TPS54526RSAR meets industry standards.
7.What is the process for return or replacement of TPS54526RSAR?
All TPS54526RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54526RSAR, 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 TPS54526RSAR part is unused and in its original packaging.
Return procedure for TPS54526RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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