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Texas Instruments TPS51427ARHBR
- Part No.:
- TPS51427ARHBR
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
TPS51427ARHBR.pdf
- Description:
- IC REG CTRLR NOTEBK 2OUT 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
TPS51427ARHBR from Texas Instruments is a dual synchronous step-down controller with integrated D-CAP™ control, designed for notebook I/O and system bus rails. It delivers two independent SMPS outputs (0.7–5.9 V and 0.5–2.5 V), supports 5.5–28 V input, features adaptive gate drivers with integrated boost switch, and enables sub-100 ns transient response in mobile computing power delivery.
For engineers reviewing the TPS51427ARHBR datasheet, TPS51427ARHBR pinout, TPS51427ARHBR application, or TPS51427ARHBR equivalent, key selection criteria include dual-channel adjustable output voltage ranges, D-CAP™ fast transient capability, selectable PWM/OOA™/Auto-Skip operating modes, temperature-compensated RDS(on) current sensing, and QFN-32 (5 mm × 5 mm) package compatibility.
Technical Context
The TPS51427ARHBR implements a fixed-frequency emulated on-time control architecture with three selectable switching frequencies (200/300/400/500 kHz depending on channel and TONSEL setting), combined with a primary D-CAP™ control loop optimized for low-ESR capacitors like POSCAP/SP-CAP. Its advanced ramp compensation minimizes jitter while preserving line/load regulation.
It integrates two independent PWM controllers (SMPS1/SMPS2), a 100-mA LDO with switchover between 5 V/3.3 V or adjustable 0.7–4.5 V output, a dedicated 3.3-V always-on reference (VREF3), and dual PGOOD outputs with ±10% trip thresholds and independent EN controls - all coordinated within a single 32-pin QFN die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5 V to 28 V - supports wide-input notebook adapter and battery-supplied rails without external pre-regulation. |
| SMPS1 Output Range | 0.7 V to 5.9 V - covers CPU core, GPU, and I/O rail requirements with precision feedback via VFB1. |
| SMPS2 Output Range | 0.5 V to 2.5 V - targets DDR memory, graphics core, and low-voltage logic supplies with REFIN2 programming. |
| LDO Output Capability | Fixed 3.3 V/5 V or adjustable 0.7–4.5 V at 100 mA - provides auxiliary bias for analog circuits, USB PHYs, or level shifters. |
| Transient Response | <100 ns - enabled by D-CAP™ architecture for rapid load-step recovery in dynamic CPU/GPU workloads. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade notebook and mobile communication device environments. |
| Package | 32-pin QFN (5 mm × 5 mm, RoHS-compliant, green) - surface-mount compatible with high-density PCB layouts. |
Pinout & Package
TPS51427ARHBR is housed in a thermally enhanced 32-pin QFN package (RHB suffix), 5 mm × 5 mm, with exposed thermal pad. Pin 1 is marked by dot; NC (pin 20) must remain unconnected. The package supports standard reflow profiles and requires proper thermal vias under the pad for reliable power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (6) | Main power input | Supplies internal LDOs and high-side driver circuitry; accepts 5.5–28 V with 30 V absolute max rating. |
| VFB1 (11) | SMPS1 feedback input | Configures SMPS1 output from 0.7 V to 5.9 V via resistive divider; 0.7 V reference threshold enables precise regulation. |
| REFIN2 (32) | SMPS2 feedback reference | Sets SMPS2 output from 0.5 V to 2.5 V; connects to V5FILT for 3.3 V or VREF3 for 1.05 V fixed outputs. |
| LDOREFIN (8) | LDO reference input | Determines LDO output: GND → 5 V, V5FILT → 3.3 V, or 0.35–2.25 V → 0.7–4.5 V (2× scaling). |
| PGOOD1/PGOOD2 (13, 28) | Channel power-good indicators | Open-drain outputs asserting low if output drops >10% below nominal or during soft-start/fault; enable sequencing control. |
| EN1/EN2 (14, 27) | Independent channel enables | Logic-controlled startup; EN1 tied to VREF2 enables delay-start sequencing where SMPS1 starts after SMPS2 regulation. |
| SKIPSEL (29) | Operating mode select | GND → Auto-Skip (light-load efficiency), floating/VREF2 → OOA™ (≥22 kHz min frequency), V5FILT → PWM-only (fixed frequency). |
| TONSEL (2) | Frequency select input | GND → 400/500 kHz, VREF2/open → 400/300 kHz, V5FILT → 200/300 kHz (SMPS1/SMPS2 respectively). |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP™ control mode | Enables stable regulation with low-ESR polymer capacitors and eliminates need for external compensation components. |
| Adaptive gate drivers with integrated boost switch | Reduces external BOM count and improves high-side FET drive strength across input voltage range. |
| Temperature-compensated RDS(on) current sensing | Eliminates sense resistors and associated power loss while maintaining accurate overcurrent protection over –40°C to +85°C. |
| Bootstrap charge auto-refresh | Maintains high-side gate drive voltage during extended light-load operation without external refresh circuitry. |
| Independent soft-start and tracking soft-stop | Prevents inrush current and enables controlled power-down sequencing between SMPS1 and SMPS2 outputs. |
Applications
| Notebook System Bus Rails | Graphics Core Power Delivery |
|---|---|
|
Use Scenario: Powering PCIe slot interface, SATA controller, and chipset I/O rails in ultrabook platforms. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller delivering tightly regulated 3.3 V and 1.05 V from shared 12 V input. Use Value: Enables single-chip solution for multiple bus voltages with independent enable/control and sequencing via EN1/EN2. |
Use Scenario: Supplying GPU core and memory interface in discrete graphics modules requiring fast transient response. IC Role / Device Role / Timing Role: SMPS2 delivers 0.8–1.2 V at up to 15 A (with external FETs) with D-CAP™-enabled <100 ns load-step recovery. Use Value: Maintains voltage stability during GPU clock bursts without external compensation or large bulk capacitance. |
| Mobile Communication Baseband | PDA Application Processor Rail |
|
Use Scenario: Generating 1.8 V RF transceiver supply and 1.2 V baseband processor core voltage in LTE handsets. IC Role / Device Role / Timing Role: Dual SMPS with independent PGOOD signals and programmable UV/OV fault thresholds per channel. Use Value: Supports safe power sequencing and fault isolation critical for cellular modem reliability and certification. |
Use Scenario: Providing scalable core voltage (0.7–1.4 V) and I/O voltage (3.3 V) for ARM-based PDA SoCs. IC Role / Device Role / Timing Role: SMPS1 adjusts core rail dynamically via VID-like resistor network on VFB1; LDO supplies clean 3.3 V I/O. Use Value: Reduces external component count while supporting dynamic voltage scaling and low-noise I/O bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS51427RHLR | Same functional spec, but 32-pin VQFN (RHL) package with different thermal pad layout and land pattern. | Requires PCB redesign due to non-identical footprint and thermal via placement; not drop-in replaceable. | Select only when RHL package is mandated by board stack-up or thermal management constraints. |
| ISL95831IRZ | Single-channel controller with integrated MOSFETs; lacks second SMPS channel and LDO; uses different control architecture (adaptive on-time + current mode). | Cannot replace dual-rail functionality of TPS51427ARHBR without adding second IC; higher solution size and cost. | Consider only for single-rail designs where space allows separate LDO and secondary regulator. |
Compared with TPS51427ARHBR, TPS51427RHLR offers identical electrical performance but demands mechanical redesign, while ISL95831IRZ provides monolithic integration at the expense of dual-channel capability and flexible voltage programming - making TPS51427ARHBR optimal for compact, multi-rail notebook power architectures.
Availability
TPS51427ARHBR is available at Aetrix Electronics and suitable for notebook system bus rails, graphics core power delivery, and mobile communication baseband applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS51427ARHBR 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 decades of expertise in high-efficiency DC/DC conversion for portable electronics.
The TPS51427A product line was engineered specifically for cost-sensitive, space-constrained notebook and mobile communication power systems, emphasizing minimal external component count, fast transient response, and seamless light-load efficiency modes.
FAQ
What is the maximum supported input voltage for the TPS51427ARHBR?
The TPS51427ARHBR supports an absolute maximum input voltage of 30 V on VIN, with recommended operation from 5.5 V to 28 V. Exceeding 30 V risks permanent damage. The device includes built-in overvoltage protection on VBST1/VBST2 (up to 37 V) and robust ESD handling per TI's design guidelines.
How does the TPS51427ARHBR achieve fast transient response under load steps?
The TPS51427ARHBR achieves <100 ns transient response using its proprietary D-CAP™ control architecture, which senses output voltage directly and adjusts on-time dynamically without external compensation. This eliminates phase-margin limitations and enables immediate correction of output deviations caused by sudden CPU/GPU load changes.
Can the TPS51427ARHBR generate both 5 V and 3.3 V simultaneously from a single input?
Yes. The TPS51427ARHBR can deliver 5 V from SMPS1 (via VFB1 = GND) and 3.3 V from SMPS2 (via REFIN2 = V5FILT), while also providing a fixed 3.3 V from VREF3 and a switchover-capable LDO output - enabling full-system rail generation from one 12 V or 19 V input source.
What is the purpose of the SKIPSEL pin on the TPS51427ARHBR?
The SKIPSEL pin selects the light-load operating mode: GND enables Auto-Skip (discontinuous conduction for peak efficiency), floating or VREF2 enables OOA™ (≥22 kHz minimum frequency to avoid audible noise), and V5FILT enables PWM-only (forced continuous conduction for predictable EMI). Each mode affects efficiency, ripple, and acoustic behavior distinctly.
Does the TPS51427ARHBR require external current-sense resistors?
No. The TPS51427ARHBR uses temperature-compensated RDS(on) current sensing on the low-side MOSFETs, eliminating external sense resistors and their associated power loss and board area. This method is factory-trimmed and specified across –40°C to +85°C with ±7% accuracy at 1 V TRIPx setting.
TPS51427ARHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP™
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, Notebook Power System
- Voltage - Input:
- 5.5V ~ 28V
- Number of Outputs:
- 2
- Voltage - Output:
- 3.3V, 5V, Adj
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VQFN (5x5)
TPS51427ARHBR FAQ
1.How can I place an order for TPS51427ARHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS51427ARHBR 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 TPS51427ARHBR reliable?
The price and inventory of TPS51427ARHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS51427ARHBR is usually 5 days.
3.What payment methods are accepted for TPS51427ARHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS51427ARHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS51427ARHBR?
TPS51427ARHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS51427ARHBR 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 TPS51427ARHBR?
For technical support, including TPS51427ARHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS51427ARHBR requirements.
6.How does Aetrix verify that TPS51427ARHBR is sourced from the original manufacturer or authorized distributors?
All TPS51427ARHBR 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 TPS51427ARHBR meets industry standards.
7.What is the process for return or replacement of TPS51427ARHBR?
All TPS51427ARHBR units undergo pre-shipment inspection (PSI). If there is an issue with TPS51427ARHBR, 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 TPS51427ARHBR part is unused and in its original packaging.
Return procedure for TPS51427ARHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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