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Texas Instruments TPS568231RNNR
- Part No.:
- TPS568231RNNR
- Manufacturer:
- Texas Instruments
- Package:
- 18-PowerVFQFN
- Datasheet:
-
TPS568231RNNR.pdf
- Description:
- IC REG BUCK ADJ 8A 18VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,610
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Product details
Overview
TPS568231RNNR from Texas Instruments is a synchronous step-down DC/DC converter delivering up to 8 A continuous output current, operating from 3.8 V to 17 V input with external bias (or 4.5 V–17 V without), featuring integrated 7.8-mΩ/3.2-mΩ MOSFETs, 0.6-V ±1% reference voltage over –40°C to 125°C, and D-CAP3™ control for fast transient response in space-constrained data center POL applications.
For engineers reviewing the TPS568231RNNR datasheet, TPS568231RNNR pinout, TPS568231RNNR application, or TPS568231RNNR equivalent, key selection considerations include selectable 400/800/1200 kHz switching frequency, dual current limit options (6–10.8 A valley), Eco-mode™ vs FCCM operation modes, soft-start configurability, and power-good monitoring - all within a thermally enhanced 3.5-mm × 3.5-mm HotRod™ QFN package.
Technical Context
The TPS568231RNNR employs adaptive on-time D-CAP3™ control with internal ripple injection, eliminating need for external compensation while supporting ceramic output capacitors. Its control loop integrates an error amplifier for tight output regulation and uses zero-current detection to enable seamless transition between Eco-mode™ (discontinuous conduction) and forced continuous conduction mode (FCCM).
Input bias flexibility allows operation with or without external 5-V supply on VREG5, directly affecting quiescent current (146 µA typical) and efficiency at light load. Thermal protection includes non-latched overtemperature shutdown at 160°C with 15°C hysteresis, and the device supports prebiased start-up and adjustable soft-start via external capacitor on SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V–17 V with external bias; 4.5 V–17 V without - enables direct use in 5 V/12 V intermediate bus systems. |
| Output Current | 8 A continuous - supports high-density point-of-load conversion for ASIC/FPGA core rails. |
| Reference Voltage | 0.6 V ±1% over –40°C to 125°C - ensures stable output regulation across industrial temperature range. |
| Switching Frequency | Selectable 400 / 800 / 1200 kHz - balances inductor size vs conduction loss for compact or high-efficiency designs. |
| Quiescent Current | 146 µA at 25°C - minimizes standby power in always-on subsystems. |
| MOSFET RDS(on) | 7.8 mΩ (high-side), 3.2 mΩ (low-side) - reduces conduction losses and thermal stress at full load. |
| Package | 3.5 mm × 3.5 mm, 18-pin HotRod™ QFN - provides low-inductance power paths and 27°C/W θJA on EVM. |
Pinout & Package
TPS568231RNNR is housed in a 3.5-mm × 3.5-mm, 18-pin VQFN-HR (HotRod™) package with exposed thermal pad. The package features multiple PGND pins for low-impedance return paths and optimized SW/BOOT routing to minimize switching loop inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires external bootstrap capacitor between BOOT and SW. |
| 2,11 VIN | Main input supply | Power input for control circuitry; decoupled to PGND with low-ESR capacitors near pins. |
| 3,4,5,8,9,10 PGND | Power ground | Low-inductance return path for high-current switching; must be connected to AGND with short trace. |
| 6,7 SW | Switch node | Connects to output inductor; critical high-dI/dt node requiring minimal loop area. |
| 12 AGND | Analog ground | Reference ground for FB, SS, EN; tied to PGND plane with short, low-impedance connection. |
| 13 FB | Feedback input | Monitors output voltage via resistor divider; sets regulated output (0.6 V reference). |
| 14 SS | Soft-start control | External capacitor sets soft-start time (default 1.2 ms); also enables output discharge during disable. |
| 15 EN | Enable input | Active-high logic input; internal pullup enables operation when floating; UVLO configurable via resistor divider. |
| 16 PGOOD | Power-good indicator | Open-drain output asserting low during fault conditions (UVP/OVP/thermal/soft-start). |
| 17 VREG5 | Internal LDO output | 4.7-V bias rail for internal circuitry; can be overdriven externally to improve light-load efficiency. |
| 18 MODE | Configuration control | Resistor-divider programmable pin selecting switching frequency, current limit, and Eco-mode/FCCM operation. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP3™ control mode | Enables fast transient response without external compensation components, supporting ultra-low-ESR ceramic output capacitors. |
| Selectable Eco-mode™ / FCCM | Optimizes efficiency at light load (Eco-mode) or minimizes output voltage ripple under dynamic load (FCCM) via MODE pin configuration. |
| Adjustable current limit | Two valley-current thresholds (6–8.15 A and 8–10.8 A) allow tailoring overcurrent protection to system requirements. |
| Prebiased start-up | Allows safe startup into precharged output rails - essential for hot-swap and multi-rail sequencing applications. |
| Integrated 4.7-V LDO with external override | VREG5 pin supplies internal circuitry and gate drivers; external 5-V bias improves efficiency by reducing input-supply quiescent draw. |
Applications
| Data Center POL | Wireless Infrastructure Baseband |
|---|---|
Use Scenario: Powering high-performance ASICs and FPGAs in 1U server blades where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12-V intermediate bus to sub-1.2-V core voltage with <1.2-ms soft-start and precise 0.6-V reference. Use Value: Delivers 8-A continuous current with <±1% output accuracy and fast load-step response (<10 µs recovery) to maintain signal integrity under burst workloads. |
Use Scenario: Supplying RF transceiver analog front-end and digital baseband processors in macrocell and small-cell radios. IC Role / Device Role / Timing Role: High-efficiency buck converter providing clean, low-noise 3.3-V or 5-V rails with FCCM mode selected to suppress switching ripple near sensitive RF sections. Use Value: Achieves >90% efficiency at 5-A load (VIN=12 V, VOUT=3.3 V, fSW=400 kHz) while maintaining <10-mVpp output ripple via selectable fixed-frequency operation. |
| Industrial PLC I/O Modules | High-End Digital TV SoC Power |
Use Scenario: Regulating power for isolated I/O channel drivers and microcontroller subsystems in factory automation controllers. IC Role / Device Role / Timing Role: Robust POL converter with non-latched UV/OV/OT protections, operating across –40°C to 125°C junction temperature range. Use Value: Sustains reliable operation under wide input transients (e.g., 24-V industrial bus dips to 18 V) with hiccup-restart current limiting and thermal shutdown at 160°C. |
Use Scenario: Generating multiple tightly regulated rails (1.1 V, 1.8 V, 3.3 V) for video processing SoCs in premium smart TVs. IC Role / Device Role / Timing Role: Compact, high-density buck regulator enabling multi-phase designs with synchronized MODE pin configuration for consistent timing behavior. Use Value: Enables 3.5-mm × 3.5-mm footprint per rail while meeting strict EMI limits through controlled slew-rate SW node and selectable 800/1200 kHz frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS568215RNNR | Pin-to-pin compatible 8-A device with identical package and feature set but fixed 400-kHz switching frequency and no MODE-selectable Eco-mode/FCCM. | Lacks configurable light-load operation - less flexible for mixed-load applications requiring both high efficiency and low ripple. | Choose when design prioritizes simplicity and fixed-frequency EMI control over adaptive light-load optimization. |
| TPS56C231RNNT | 12-A rated variant in same 3.5-mm × 3.5-mm RNN package; shares MODE pin functionality and D-CAP3™ architecture. | Higher current capability suits future-proofing or parallel configurations; requires verification of PCB copper weight and thermal relief for 12-A operation. | Choose when system margin demands >8-A headroom or when designing scalable platforms across 8-A/12-A variants. |
Compared with TPS568215RNNR, the TPS568231RNNR adds selectable Eco-mode™/FCCM and three switching frequencies for optimized efficiency/ripple trade-offs; compared with TPS56C231RNNT, it delivers matched performance at lower cost and thermal load for 8-A applications without overdesign.
Availability
TPS568231RNNR is available at Aetrix Electronics and suitable for data center POLs, wireless infrastructure baseband units, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS568231RNNR 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.
The TPS568231RNNR belongs to TI's D-CAP3™ synchronous buck converter family, designed specifically for high-density, high-efficiency point-of-load regulation in data center, telecom, and industrial applications where thermal performance and layout simplicity are critical.
FAQ
What input voltage range does the TPS568231RNNR support with and without external bias?
The TPS568231RNNR supports 3.8 V–17 V input with external 5-V bias applied to VREG5, and 4.5 V–17 V without external bias. This dual-range capability allows direct integration into 5-V or 12-V intermediate bus systems while maintaining full functionality across industrial temperature extremes.
How does the MODE pin configure switching frequency and current limit on the TPS568231RNNR?
The MODE pin on the TPS568231RNNR accepts a resistor divider from VREG5 to AGND to select among 12 combinations of switching frequency (400/800/1200 kHz), valley current limit (6–8.15 A or 8–10.8 A), and light-load mode (Eco-mode™ or FCCM). Table 7-2 in the datasheet defines exact resistor values for each configuration.
Can the TPS568231RNNR operate with precharged output capacitors?
Yes, the TPS568231RNNR supports prebiased start-up, allowing safe turn-on into an already charged output rail. This feature prevents reverse current flow and ensures controlled ramp-up even when VOUT is initially at or above the target regulation voltage.
What is the purpose of the VREG5 pin on the TPS568231RNNR, and how does external bias affect efficiency?
The VREG5 pin outputs a 4.7-V internal LDO voltage used to power internal circuitry and gate drivers. Applying an external 5-V supply overrides the internal LDO, reducing quiescent current drawn from VIN and improving light-load efficiency - especially beneficial in always-on subsystems.
Does the TPS568231RNNR require external compensation components?
No, the TPS568231RNNR uses D-CAP3™ control architecture with internal ripple injection and an integrated error amplifier, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and maintains stability across a wide range of ceramic output capacitors and inductor values.
TPS568231RNNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 18-PowerVFQFN
- 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):
- 3.8V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 8A
- Frequency - Switching:
- 400kHz, 800kHz, 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-VQFN-HR (3.5x3.5)
TPS568231RNNR FAQ
1.How can I place an order for TPS568231RNNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS568231RNNR 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 TPS568231RNNR reliable?
The price and inventory of TPS568231RNNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS568231RNNR is usually 5 days.
3.What payment methods are accepted for TPS568231RNNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS568231RNNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS568231RNNR?
TPS568231RNNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS568231RNNR 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 TPS568231RNNR?
For technical support, including TPS568231RNNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS568231RNNR requirements.
6.How does Aetrix verify that TPS568231RNNR is sourced from the original manufacturer or authorized distributors?
All TPS568231RNNR 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 TPS568231RNNR meets industry standards.
7.What is the process for return or replacement of TPS568231RNNR?
All TPS568231RNNR units undergo pre-shipment inspection (PSI). If there is an issue with TPS568231RNNR, 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 TPS568231RNNR part is unused and in its original packaging.
Return procedure for TPS568231RNNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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