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Texas Instruments TPS51275BRUKR
- Part No.:
- TPS51275BRUKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
TPS51275BRUKR.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 20WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,449
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Product details
Overview
TPS51275BRUKR from Texas Instruments is a dual synchronous step-down controller with integrated 5-V/3.3-V LDOs, designed for notebook and tablet system power supplies. It delivers 5 V and 3.3 V outputs (±1% reference accuracy), supports 5–24 V input, operates at 300 kHz (CH1) and 355 kHz (CH2), and features OOA light-load mode for audible-noise suppression.
For engineers reviewing the TPS51275BRUKR datasheet, TPS51275BRUKR pinout, TPS51275BRUKR application, or TPS51275BRUKR equivalent, key selection criteria include its Out-of-Audio™ light-load operation, separate EN1/EN2 control, built-in 100-mA LDOs, and adaptive D-CAP™ control architecture requiring no external compensation.
Technical Context
The TPS51275BRUKR implements adaptive on-time D-CAP™ control with feed-forward input/output voltage sensing to maintain target switching frequencies-300 kHz for CH1 (5 V) and 355 kHz for CH2 (3.3 V) under CCM at VIN = 20 V. Its OOA mode forces minimum 40 µs MOSFET switching during light load to suppress acoustic noise.
It integrates two independent LDOs: always-on 3.3-V (VREG3) and always-on 5-V (VREG5) regulators, each rated for 100 mA. Output discharge is handled internally via VO1 (CH1) and SW2 (CH2), and overcurrent protection uses temperature-compensated RDS(on) sensing with CS1/CS2 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5 V to 24 V - supports wide-input notebook adapter and battery-derived rails without pre-regulation. |
| Output Voltages | 5.0 V ±1% and 3.3 V ±1% - precision regulation enabled by 2.00 V internal reference with ±10 mV tolerance. |
| Switching Frequencies | CH1: 300 kHz, CH2: 355 kHz - fixed-frequency CCM operation optimized for efficiency and EMI in portable systems. |
| Light-Load Mode | Out-of-Audio™ (OOA) - maintains switching >20 kHz under light load to eliminate audible coil whine. |
| LDO Outputs | VREG5: 5.0 V / 100 mA, VREG3: 3.3 V / 100 mA - always-on, enabling fast wake-up and gate-drive bias independence from main SMPS. |
| Protection Features | OVP (115% trip), UVP (60% trip), OTP (155°C shutdown), non-latch UVLO on VIN/VREG5/VREG3 - ensures robust fault recovery in mobile platforms. |
| Soft-Start Time | 0.8 ms - internal voltage-servo ramp prevents inrush current and stabilizes startup across both channels. |
Pinout & Package
TPS51275BRUKR is housed in a 20-pin, 3 mm × 3 mm QFN package (RUK) with exposed thermal pad soldered to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2 | Independent enable inputs | Control CH1 (5 V) and CH2 (3.3 V) separately; logic-high threshold = 1.6 V, low = 0.3 V. |
| VREG5, VREG3 | Always-on LDO outputs | Provide 5 V/100 mA and 3.3 V/100 mA bias for gate drivers and analog circuitry; require ≥1 µF ceramic bypass. |
| DRVH1/DRVH2, DRVL1/DRVL2 | High-side/low-side gate drivers | Drive external N-MOSFETs; DRVH sink/source R = 1.9 Ω / 3.0 Ω, DRVL sink/source R = 0.9 Ω / 3.0 Ω. |
| VCLK | Charge-pump clock output | 260 kHz open-drain signal referenced to VO1; enables external gate-boost circuits without extra oscillator. |
| CS1, CS2 | Current-sense inputs | Accept 0.2–2 V sensed voltage for valley-current OCL; 10 µA source current with 4500 ppm/°C tempco for RDS(on) compensation. |
| PGOOD | Combined power-good flag | Open-drain output pulled high externally; asserts high only when both CH1 and CH2 outputs are within 95–110% regulation window. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP™ Adaptive On-Time Control | Eliminates need for external loop compensation components; enables stable operation with polymer or specialty capacitors (not ceramic). |
| Out-of-Audio™ Light-Load Mode | Maintains >20 kHz switching frequency down to near-zero load, preventing audible noise in thin-client and tablet applications. |
| Integrated Always-On LDOs | VREG5 and VREG3 remain active even when main SMPS channels are disabled, supporting fast system wake-up and auxiliary bias. |
| Internal Output Discharge | Automatically discharges CH1 via VO1 and CH2 via SW2 upon disable, eliminating need for external bleed resistors or FETs. |
| Separate Enable & Dedicated OC Terminals | EN1/EN2 allow staggered sequencing; CS1/CS2 provide independent, temperature-compensated overcurrent thresholds per channel. |
Applications
| Mobile Notebook Power Supply | Tablet System Rail Generation |
|---|---|
|
Use Scenario: Dual-rail power for CPU core I/O and chipset in ultrathin notebooks with 12–19 V adapters. IC Role / Device Role / Timing Role: Primary dual-buck controller managing 5 V system rail and 3.3 V peripheral rail with coordinated PGOOD signaling. Use Value: OOA mode eliminates audible noise during idle/sleep; always-on LDOs enable instant resume from S3/S4 states. |
Use Scenario: Compact power solution for ARM-based tablets using single-cell Li-ion (3.0–4.2 V) with boost + buck architecture. IC Role / Device Role / Timing Role: Secondary buck controller generating regulated 5 V/3.3 V from intermediate boost rail (e.g., 8–12 V). Use Value: 3 mm × 3 mm QFN footprint minimizes board area; internal discharge avoids BOM cost of external discharge FETs. |
| Embedded Industrial Tablet | POS Terminal Mainboard |
|
Use Scenario: Fanless industrial tablet operating in -20°C to 70°C ambient with strict EMI and acoustic requirements. IC Role / Device Role / Timing Role: Dual-channel DC/DC controller supplying 5 V USB ports and 3.3 V SoC interface rails. Use Value: Non-latch UVLO and OTP ensure graceful recovery after thermal or input brownout events; ±1% reference ensures sensor/interface accuracy. |
Use Scenario: Point-of-sale terminal with barcode scanner, display, and Ethernet requiring clean, sequenced 5 V and 3.3 V rails. IC Role / Device Role / Timing Role: Central power controller coordinating rail startup via EN1/EN2 and reporting system readiness via PGOOD. Use Value: Separate enable inputs allow controlled power-up sequence (e.g., 3.3 V before 5 V); VCLK drives external charge pump for high-side gate drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51275CRUKR | Auto-skip light-load mode instead of OOA; identical pinout, LDOs, and frequency specs. | Suitable where acoustic noise is not critical but ultra-low quiescent current is preferred. | Select TPS51275CRUKR if system prioritizes lowest standby power over silent operation. |
| RT8205AZSP | Single-chip dual-phase controller with integrated MOSFETs; 300 kHz fixed frequency; no LDOs or VCLK. | Used in space-constrained designs where external FETs and discrete LDOs are undesirable. | Choose RT8205AZSP only when board area is paramount and external LDOs/VCLK are acceptable trade-offs. |
Compared with TPS51275BRUKR, TPS51275CRUKR offers identical functionality except for light-load behavior (auto-skip vs. OOA), while RT8205AZSP trades integration depth (integrated FETs) for loss of LDOs and clock output-making it unsuitable for systems requiring always-on bias or charge-pump support.
Availability
TPS51275BRUKR is available at Aetrix Electronics and suitable for notebook computers, tablet computers, embedded industrial tablets, and POS terminal mainboards requiring stable component supply and long-term design continuity.
Supply support for TPS51275BRUKR 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 power conversion for portable and industrial systems.
The TPS51275 family targets cost-effective, high-efficiency notebook and tablet power solutions-designed to reduce external component count while delivering precise dual-rail regulation and robust protection.
FAQ
What is the key functional difference between TPS51275BRUKR and TPS51275RUKR?
The TPS51275BRUKR implements Out-of-Audio™ (OOA) light-load operation to suppress audible noise, whereas the TPS51275RUKR uses auto-skip mode. Both share identical pinout, LDO capability, and switching frequencies-but OOA ensures continuous >20 kHz switching under light load, critical for quiet portable devices. The TPS51275BRUKR also enables both VREG5 and VREG3 as always-on, unlike the base TPS51275RUKR which only keeps VREG3 always-on.
Does TPS51275BRUKR support ceramic output capacitors?
No-TPS51275BRUKR's D-CAP™ control loop requires output capacitors with sufficient ESR (e.g., polymer or specialty aluminum) to ensure stability. Ceramic capacitors yield too-high 0 dB loop crossover frequency (>700 kHz), risking oscillation. The datasheet explicitly recommends organic semiconductor or polymer capacitors, and Equation 2 confirms stability depends on ESR × COUT product-not ceramic's near-zero ESR.
How does the VCLK output function in TPS51275BRUKR?
The VCLK pin on TPS51275BRUKR delivers a 260 kHz square wave referenced to VO1 (5 V output), activated only when EN1 is asserted. It drives external charge-pump circuits to generate boosted gate-drive voltage for high-side N-MOSFETs-eliminating need for dedicated bootstrap diodes or external oscillators. If unused, VCLK may be left floating; no pull-up/down is required.
What protection features are implemented in TPS51275BRUKR?
TPS51275BRUKR includes overvoltage protection (OVP) at 115% nominal output, undervoltage protection (UVP) at 60%, overtemperature shutdown at 155°C, and non-latch UVLO on VIN (4.58 V), VREG5 (4.38 V), and VREG3 (3.15 V). It also provides cycle-by-cycle overcurrent limiting via CS1/CS2 with temperature-compensated RDS(on) sensing and internal output discharge on disable.
Can TPS51275BRUKR operate with input voltage below 5 V?
No-TPS51275BRUKR has a minimum recommended input voltage of 5 V per the datasheet's Recommended Operating Conditions table. Absolute maximum ratings permit VIN down to –0.3 V, but functional operation is not guaranteed below 5 V. Attempting sub-5 V operation risks failure to start, unstable regulation, or violation of VBST and DRVH voltage constraints relative to SW nodes.
TPS51275BRUKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP™
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 300kHz, 355kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- 3.3V, 100mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 5V ~ 24V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WQFN (3x3)
TPS51275BRUKR FAQ
1.How can I place an order for TPS51275BRUKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51275BRUKR 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 TPS51275BRUKR reliable?
The price and inventory of TPS51275BRUKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51275BRUKR is usually 5 days.
3.What payment methods are accepted for TPS51275BRUKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51275BRUKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51275BRUKR?
TPS51275BRUKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51275BRUKR 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 TPS51275BRUKR?
For technical support, including TPS51275BRUKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51275BRUKR requirements.
6.How does Aetrix verify that TPS51275BRUKR is sourced from the original manufacturer or authorized distributors?
All TPS51275BRUKR 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 TPS51275BRUKR meets industry standards.
7.What is the process for return or replacement of TPS51275BRUKR?
All TPS51275BRUKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51275BRUKR, 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 TPS51275BRUKR part is unused and in its original packaging.
Return procedure for TPS51275BRUKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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