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Texas Instruments TPS54427DRCT
- Part No.:
- TPS54427DRCT
- Manufacturer:
- Texas Instruments
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TPS54427DRCT.pdf
- Description:
- IC REG BUCK ADJ 4A 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
TPS54427DRCT from Texas Instruments is a 4-A synchronous step-down DC/DC converter with integrated high-side (74 mΩ) and low-side (53 mΩ) N-channel MOSFETs, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.76 V to 7.0 V. It employs D-CAP2™ adaptive on-time control for fast transient response without external compensation, supports ceramic output capacitors, and targets power rails in digital TV, Blu-ray players, and STB systems.
For engineers reviewing the TPS54427DRCT datasheet, TPS54427DRCT pinout, TPS54427DRCT application, or TPS54427DRCT equivalent, key selection considerations include its 650-kHz switching frequency, pre-biased soft-start capability, cycle-by-cycle overcurrent protection, thermal shutdown at 170°C, and VSON-10 (3.0 mm × 3.0 mm) package with exposed thermal pad for enhanced thermal performance.
Technical Context
The TPS54427DRCT implements D-CAP2™ mode control using an adaptive on-time PWM architecture that sets on-time based on VIN and VOUT to maintain quasi-fixed 650-kHz operation - eliminating need for external oscillator or compensation network. Its internal circuitry enables stable regulation with ultra-low-ESR ceramic capacitors by synthesizing ripple via internal ramp injection.
It integrates dual N-FETs with verified RDS(on) values (74 mΩ HS / 53 mΩ LS), features adjustable soft-start via external capacitor on SS pin, and provides non-latching protections including UVLO (3.45–4.05 V on VREG5), valley-current-based OCP, and thermal shutdown (170°C threshold, 35°C hysteresis).
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 | Up to 4 A continuous - sufficient for core logic, SoC I/O, and memory power domains in embedded video systems. |
| Switching Frequency | 650 kHz nominal - balances EMI, efficiency, and component size; fixed by adaptive on-time, not external clock. |
| Feedback Reference | 0.765 V ±6 mV (25°C), ±14 mV (–40°C to 85°C) - enables precise output setting with standard resistor dividers. |
| HS/LS FET RDS(on) | 74 mΩ / 53 mΩ - optimized conduction loss for typical 12 V→1.05 V conversion with ~85% peak efficiency. |
| Shutdown Current | 3.0–10 μA - minimizes standby power in always-on subsystems like remote control receivers or HDMI hot-plug detection. |
| Soft-Start Control | 6 μA constant-current source on SS pin - allows programmable ramp time (e.g., 10 ms with 8.2 nF) and prevents inrush into pre-biased outputs. |
Pinout & Package
VSON-10 (DRCT) package: 3.00 mm × 3.00 mm body, 0.5 mm pitch, exposed thermal pad (PGND) on underside requiring solder connection to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable input | Active-high logic control; internal 225–900 kΩ pull-down ensures default disable; requires ≥1.6 V to activate. |
| 2 - VFB | Feedback input | Senses output voltage via resistor divider; 0.765 V reference enables accurate regulation; ±0.1 μA input bias minimizes divider error. |
| 3 - VREG5 | Internal 5.5 V LDO output | Powers gate drivers and internal circuitry; supplies up to 10 mA; requires 1 μF ceramic cap to GND for stability. |
| 4 - SS | Soft-start control | 6 μA current source charges external capacitor; sets output ramp time and enables pre-biased startup sequencing. |
| 5 - GND | Analog ground reference | Signal return for VFB, SS, and EN; must be star-connected near IC to minimize noise coupling into feedback path. |
| 6 - SW | Power switch node | Connection point between HS and LS FETs; carries high di/dt switching current; requires tight layout with low-inductance loop. |
| 7 - VBST | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1 μF ceramic cap to SW for HS gate drive; max 6 V relative to SW. |
| 8 - VIN | Main input supply | Primary power input (4.5–18 V); must be decoupled with ≥10 μF ceramic + optional 0.1 μF high-frequency cap. |
| 9–10 - VIN | Dual input power pins | Parallel VIN connections reduce trace resistance and improve current sharing; both must connect to same input net. |
| Exposed Pad | PGND / Thermal pad | Low-impedance power ground return for LS FET and thermal dissipation path; must be soldered to ≥4-layer PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables <10 µs load-step response with zero external compensation components - reduces BOM count and design iteration time. |
| Ceramic capacitor compatibility | Stable operation with ultra-low-ESR ceramic output caps (22–68 µF) eliminates need for POSCAP/SP-CAP, lowering cost and footprint. |
| Pre-biased soft-start | Prevents reverse current flow during startup into powered-up downstream rails - critical for hot-swap and multi-rail sequencing. |
| Cycle-by-cycle overcurrent protection | Valley-current sensing on LS FET with 7-cycle fault detection avoids false trips during transient overload while protecting against sustained shorts. |
| Integrated 5.5 V LDO (VREG5) | Self-powered gate drive and internal biasing eliminate need for external bias supply - simplifies system-level power architecture. |
Applications
| Digital TV Power Supply | High Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Powers main SoC core voltage (1.05 V @ 4 A) and DDR3 memory interface (1.5 V) from 12 V DC input. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise core rail with fast transient immunity to video decode bursts. Use Value: D-CAP2™ control maintains <±15 mV output deviation during 1–3 A load steps at 1 A/µs slew rate - preventing frame drops or audio glitches. |
Use Scenario: Supplies HDMI PHY, laser driver, and servo controller from 5 V or 12 V input in optical disc playback unit. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter enabling compact heatsink-free design in thermally constrained plastic chassis. Use Value: 85% peak efficiency at 4 A and 1.05 V output reduces thermal load by >1.5 W vs discrete solutions - extending product lifetime. |
| Networking Home Terminal | Digital Set Top Box (STB) |
Use Scenario: Generates 3.3 V and 1.8 V rails for Ethernet PHY, Wi-Fi module, and ARM application processor in gateway device. IC Role / Device Role / Timing Role: Dual-output capable (with external resistors) primary DC/DC stage supporting dynamic voltage scaling for energy-efficient operation. Use Value: Adjustable soft-start and UVLO (3.45–4.05 V) ensure clean power-up sequencing across variable AC adapter inputs (5–12 V). |
Use Scenario: Delivers 1.2 V CPU core and 1.8 V I/O rails from 12 V wall adapter in cable/satellite receiver with 24/7 operation. IC Role / Device Role / Timing Role: Robust, thermally optimized buck converter with 170°C thermal shutdown and 150°C junction rating for fanless enclosures. Use Value: Exposed thermal pad (PGND) achieves 18.2°C/W RθJB - enabling full 4 A load at 85°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428DRCT | Same pinout and package; adds power-good (PG) output and tighter VFB accuracy (±0.5% vs ±0.9%). | Required where system-level power sequencing or fault reporting is needed (e.g., FPGA configuration, multi-rail supervisors). | Select TPS54428DRCT when PG signal or improved reference tolerance is mandatory; otherwise TPS54427DRCT offers lower cost and identical core functionality. |
| MP2342DL-LF-Z | Monolithic 4 A buck in 3×3 mm QFN; 500 kHz fixed frequency; no VREG5 LDO - requires external bias supply. | Suitable for space-constrained designs where board area is prioritized over ease of use and self-contained operation. | Choose MP2342DL-LF-Z only if PCB real estate is critical and external 5 V bias is available; TPS54427DRCT provides greater integration and simpler layout. |
Compared with TPS54428DRCT, TPS54427DRCT trades PG signaling and tighter VFB tolerance for lower unit cost and unchanged thermal performance; versus MP2342DL-LF-Z, it delivers higher integration (integrated VREG5, no external bias) at the expense of slightly larger solution size and fixed-frequency flexibility.
Availability
TPS54427DRCT is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player SoC rails, and STB core voltage regulation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS54427DRCT 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-reliability DC/DC conversion.
The TPS54427 belongs to TI's D-CAP2™ synchronous buck converter family, designed specifically for cost-sensitive, high-transient-performance consumer and industrial power rails where minimal external components and ceramic capacitor compatibility are essential.
FAQ
What is the maximum recommended output current for TPS54427DRCT under continuous operation?
The TPS54427DRCT is rated for 4 A continuous output current per the datasheet's Recommended Operating Conditions and Electrical Characteristics tables. This rating assumes proper PCB layout with the exposed thermal pad soldered to a ≥4-layer ground plane and ambient temperature ≤85°C. At full load and 12 V input, thermal performance is validated via RθJB = 18.2°C/W, ensuring junction temperature remains within the 150°C limit. Derating is required above 85°C ambient.
Does TPS54427DRCT support pre-biased output startup, and how does it work?
Yes, TPS54427DRCT supports pre-biased soft-start via proprietary circuitry that prevents reverse current flow during startup. When the SS pin voltage exceeds the feedback voltage (VFB), the controller initiates synchronous rectification with narrow low-side gate pulses, incrementally increasing on-time cycle-by-cycle until reaching normal duty-cycle operation. This ensures smooth ramp-up into regulation without discharging the pre-biased output rail - a critical feature for multi-rail systems and hot-swap applications.
What is the purpose of the VREG5 pin on TPS54427DRCT, and what external component is required?
The VREG5 pin on TPS54427DRCT is an internally generated 5.5 V LDO output used to power the high-side gate driver and internal control circuitry. A 1 µF ceramic capacitor must be placed between VREG5 and GND, close to the IC, to stabilize this supply and suppress switching noise. The pin delivers up to 10 mA and is inactive when EN = low. It also feeds the internal bootstrap diode for VBST generation.
Can TPS54427DRCT operate with only ceramic output capacitors, and why is this significant?
Yes, TPS54427DRCT is explicitly designed for stable operation with ceramic output capacitors (22–68 µF typical), enabled by its D-CAP2™ control architecture and internal ripple-synthesis circuitry. This eliminates reliance on higher-ESR polymer or tantalum capacitors, reducing solution cost, size, and failure risk while improving reliability and transient response - especially important in consumer electronics with strict MTBF and thermal requirements.
What protection features are integrated into TPS54427DRCT, and are they latching or non-latching?
TPS54427DRCT integrates non-latching undervoltage lockout (UVLO), cycle-by-cycle overcurrent protection (OCP), and thermal shutdown (TSD). UVLO monitors VREG5 and disables the device below ~3.6 V; OCP uses valley-current sensing on the low-side FET and resets automatically after fault removal; TSD triggers at ~170°C with 35°C hysteresis and resumes operation once cooled. None require manual reset - all recover autonomously upon fault clearance.
TPS54427DRCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, D-CAP2™
- Package/Case:
- 10-VFDFN 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):
- 7V
- Current - Output:
- 4A
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSON (3x3)
TPS54427DRCT FAQ
1.How can I place an order for TPS54427DRCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54427DRCT 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 TPS54427DRCT reliable?
The price and inventory of TPS54427DRCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54427DRCT is usually 5 days.
3.What payment methods are accepted for TPS54427DRCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54427DRCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54427DRCT?
TPS54427DRCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54427DRCT 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 TPS54427DRCT?
For technical support, including TPS54427DRCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54427DRCT requirements.
6.How does Aetrix verify that TPS54427DRCT is sourced from the original manufacturer or authorized distributors?
All TPS54427DRCT 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 TPS54427DRCT meets industry standards.
7.What is the process for return or replacement of TPS54427DRCT?
All TPS54427DRCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS54427DRCT, 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 TPS54427DRCT part is unused and in its original packaging.
Return procedure for TPS54427DRCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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