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Texas Instruments TPS56838RPAR
- Part No.:
- TPS56838RPAR
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerVFQFN
- Datasheet:
-
TPS56838RPAR.pdf
- Description:
- IC REG BUCK ADJ 8A 10VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,878
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Product details
Overview
TPS56838RPAR from Texas Instruments is an 8A synchronous buck converter operating in forced continuous conduction mode (FCCM), supporting 4.5V–28V input and 0.6V–13V output with integrated 20.4mΩ/9.5mΩ MOSFETs, 0.6V ±1% reference, and D-CAP3™ control for fast transient response. It delivers stable power to industrial PCs, factory automation controllers, and 12V/19V/24V bus systems.
For engineers reviewing the TPS56838RPAR datasheet, TPS56838RPAR pinout, TPS56838RPAR application, or TPS56838RPAR equivalent, key selection criteria include FCCM operation for low-output-ripple performance across full load range, MODE-pin-configurable switching frequencies (500/800/1200 kHz), adjustable soft-start (default 1.8 ms), and integrated non-latched OV/UV/OT/OC protections with power-good indicator.
Technical Context
The TPS56838RPAR implements D-CAP3™ adaptive on-time control with internal ripple injection, eliminating external compensation while enabling stable regulation with ultra-low-ESR MLCC output capacitors. Its FCCM operation ensures continuous inductor current at all loads, suppressing audible noise and minimizing output voltage ripple compared to Eco-mode or OOA variants.
Control logic reads the MODE pin at startup to latch frequency (500/800/1200 kHz) and low-side valley current limit (7.2A or 9.6A); configuration persists until VIN or EN power cycle. Soft-start is set by SS pin capacitor or defaults to 1.8 ms; built-in 200Ω discharge MOSFET enables controlled output discharge during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide industrial and computing bus rails including 12V, 19V, and 24V inputs. |
| Output Current | 8A continuous - sustains full-rated load without derating under typical thermal conditions on 4-layer PCB. |
| Feedback Reference | 0.6V ±1% at 25°C - enables precise output regulation down to 0.6V with minimal error across –40°C to +150°C. |
| Switching Frequency | Selectable 500/800/1200 kHz - balances efficiency, size, and EMI; higher frequencies allow smaller magnetics and input/output capacitors. |
| MOSFET RDS(on) | HS: 20.4mΩ, LS: 9.5mΩ at 25°C - reduces conduction losses and improves full-load efficiency, especially at high input voltages. |
| Quiescent Current | 370 µA - optimized for always-on systems where standby power matters less than ripple performance. |
| Operating Junction Temp | –40°C to +150°C - rated for harsh environments including motor drives, industrial controls, and enclosed power supplies. |
Pinout & Package
TPS56838RPAR uses a 10-pin 3.0mm × 3.0mm HotRod™ QFN (RPA package) with exposed thermal pad for enhanced thermal performance and reduced parasitic inductance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | Logic-controlled startup; floating enables operation; resistor divider configures external UVLO threshold. |
| FB | Feedback input | Monitors output via resistor divider; sets regulated VOUT = 0.6V × (1 + RFBT/RFBB). |
| AGND | Analog ground | Reference for FB, SS, MODE, PG; must connect to PGND at single point to avoid noise coupling. |
| PG | Power-good open-drain output | Asserts low if VOUT falls below 90% or rises above 115% of target; 10mA sink capability. |
| SS | Soft-start timing | Capacitor-to-AGND sets ramp time; floating defaults to 1.8ms internal soft-start. |
| SW | Switching node | Connects to inductor; requires short, wide copper trace to minimize ringing and EMI. |
| BOOT | High-side gate drive supply | 0.1µF bootstrap capacitor between BOOT and SW provides gate voltage for HS MOSFET. |
| VIN | Main input power | Supplies controller and HS MOSFET drain; multiple pins (8, 10) reduce IR drop and improve current handling. |
| PGND | Power ground | Source of LS MOSFET; connects to input/output capacitor grounds and thermal pad. |
| MODE | Frequency/current limit select | Resistor-to-AGND selects one of six configurations: 500/800/1200 kHz × ILIM-1/ILIM. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP3™ control mode | Enables stable operation with zero external compensation components and compatibility with MLCC-only output filters. |
| Forced Continuous Conduction Mode (FCCM) | Maintains continuous inductor current at all loads, eliminating light-load discontinuous modes that cause output ripple and audible noise. |
| Integrated power MOSFETs | 20.4mΩ HS / 9.5mΩ LS RDS(on) reduces conduction loss and simplifies layout versus discrete solutions. |
| Non-latched protection suite | Auto-recovering UV/OV/OC/OT faults prevent system lockup; hiccup-mode UVP allows safe restart after fault removal. |
| Built-in output discharge | 200Ω integrated discharge path rapidly collapses VOUT during shutdown, preventing backfeed into downstream circuitry. |
Applications
| Industrial PC & Factory Automation | Multifunction Printers & Video Conferencing |
|---|---|
Use Scenario: Powering CPU I/O, FPGA banks, and sensor interfaces in DIN-rail mounted PLCs and IPCs with 24V DC input. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator delivering clean, low-ripple power under dynamic load transients. Use Value: FCCM operation ensures consistent ripple profile across idle-to-full load, avoiding interference with sensitive analog or timing circuits. | Use Scenario: Supplying imaging sensors, DSP cores, and USB hub controllers in compact MFPs and video conferencing endpoints. IC Role / Device Role / Timing Role: High-efficiency 12V-to-5V/3.3V conversion with fast transient response for burst-mode processing loads. Use Value: D-CAP3™ control delivers sub-10µs load-step recovery without external compensation, preserving image/video integrity. |
| Monitors, TVs & Audio Systems | Portable Electronics Power Bus |
Use Scenario: Generating 5V/12V rails for display logic, backlight drivers, and audio amplifiers in flat-panel displays and smart speakers. IC Role / Device Role / Timing Role: Secondary buck regulator fed from 19V or 24V adapter input, providing isolated, low-noise power domains. Use Value: 1200kHz option enables use of miniature 1µH inductors and 10µF MLCCs, reducing board area by >30% vs lower-frequency alternatives. | Use Scenario: Point-of-load regulation for battery-charged systems requiring stable 5V/3.3V from variable 12V–24V vehicle or portable power sources. IC Role / Device Role / Timing Role: Robust buck converter with wide VIN range and thermal resilience for mobile test equipment and field-deployed devices. Use Value: –40°C to +150°C junction rating and non-latched OT protection ensure reliable operation in unventilated enclosures or hot ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS56837RPAR | Eco-mode (auto-skip) instead of FCCM; 45µA IQ vs 370µA; same pinout and package. | Better light-load efficiency but higher output ripple at partial load; unsuitable where ripple-sensitive analog circuits are present. | Select TPS56837RPAR only when average load is <1A and lowest standby power is critical. |
| TPS56837HRPAR | Pin-to-pin compatible 8A variant with identical FCCM operation; differs only in qualification level (industrial vs extended temp). | Same functional behavior; qualified for extended temperature range (–40°C to +150°C) with tighter parametric testing. | Choose TPS56837HRPAR for mission-critical industrial deployments requiring AEC-Q200 alignment or enhanced reliability screening. |
Compared with TPS56837RPAR, the TPS56838RPAR prioritizes output stability over light-load efficiency; compared with TPS56837HRPAR, it offers identical electrical performance at standard industrial qualification-making it optimal for cost-sensitive, high-volume designs where extended qualification is not required.
Availability
TPS56838RPAR is available at Aetrix Electronics and suitable for industrial PC, factory automation, and multimedia display applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS56838RPAR 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 high-efficiency DC/DC conversion.
The TPS5683x family was designed specifically for space-constrained, high-current industrial and computing applications needing simplified design, fast transient response, and robust protection-without external compensation or complex layout rules.
FAQ
What is the primary operating mode of the TPS56838RPAR?
The TPS56838RPAR operates exclusively in forced continuous conduction mode (FCCM), ensuring uninterrupted inductor current flow across the entire 0–8A load range. This eliminates discontinuous conduction artifacts like output voltage ripple spikes and audible coil whine, making it ideal for noise-sensitive applications such as video processing and precision analog subsystems. Unlike the TPS56837RPAR (Eco-mode) or TPS56836RPAR (OOA mode), the TPS56838RPAR does not skip cycles or modulate frequency to save power at light loads.
How is switching frequency selected on the TPS56838RPAR?
Switching frequency on the TPS56838RPAR is set by connecting a resistor between the MODE pin and AGND, selecting one of three fixed frequencies: 500 kHz, 800 kHz, or 1200 kHz. The exact resistance value determines both frequency and low-side valley current limit (7.2A or 9.6A), per TI's MODE pin lookup table. Configuration occurs once at power-up and remains latched until VIN or EN is cycled. No external clock signal or digital interface is required.
Does the TPS56838RPAR require external compensation components?
No, the TPS56838RPAR does not require external compensation components due to its D-CAP3™ control architecture. This proprietary adaptive on-time topology integrates internal ripple injection and error amplification, enabling stable regulation with ceramic (MLCC) or polymer output capacitors alone. Designers eliminate loop compensation networks, reducing BOM count, layout complexity, and tuning effort-while maintaining fast transient response and tight line/load regulation.
What thermal performance can be expected from the TPS56838RPAR in a standard PCB layout?
In a standard 4-layer PCB layout with thermal vias under the exposed pad, the TPS56838RPAR achieves an effective junction-to-ambient thermal resistance (Eff RθJA) of 30°C/W. At 8A output with 12V input and 5V output, typical power dissipation is ~1.8W, resulting in ~54°C junction rise above ambient-well within the –40°C to +150°C operating range. For higher ambient or no-airflow environments, thermal relief via additional copper area or heatsinking is recommended to maintain margin.
How does the TPS56838RPAR handle overvoltage and undervoltage faults?
The TPS56838RPAR implements non-latched, auto-recovering protections: output overvoltage (OVP) triggers at 125% of target VOUT, discharging the output via internal MOSFET and halting switching for 32 µs before recovery; undervoltage protection (UVP) activates at 65% of target VOUT, entering hiccup mode with 256 µs deglitch delay and 10.5×soft-start-time recovery interval. Both features prevent permanent damage while allowing graceful system-level fault handling without manual reset.
TPS56838RPAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-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):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 8A
- Frequency - Switching:
- 500kHz, 800kHz, 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VQFN-HR (3x3)
TPS56838RPAR FAQ
1.How can I place an order for TPS56838RPAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS56838RPAR 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 TPS56838RPAR reliable?
The price and inventory of TPS56838RPAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS56838RPAR is usually 5 days.
3.What payment methods are accepted for TPS56838RPAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS56838RPAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS56838RPAR?
TPS56838RPAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS56838RPAR 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 TPS56838RPAR?
For technical support, including TPS56838RPAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS56838RPAR requirements.
6.How does Aetrix verify that TPS56838RPAR is sourced from the original manufacturer or authorized distributors?
All TPS56838RPAR 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 TPS56838RPAR meets industry standards.
7.What is the process for return or replacement of TPS56838RPAR?
All TPS56838RPAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS56838RPAR, 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 TPS56838RPAR part is unused and in its original packaging.
Return procedure for TPS56838RPAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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