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Texas Instruments TPS54227DDAR
- Part No.:
- TPS54227DDAR
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS54227DDAR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:7,801
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Product details
Overview
TPS54227DDAR from Texas Instruments is a 2-A synchronous step-down DC/DC converter with integrated high- and low-side N-channel MOSFETs, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.76 V to 7 V. It uses D-CAP2™ adaptive on-time control for fast transient response, achieves up to 95% efficiency at 1 A, and supports ceramic output capacitors in compact HSOP-8 PowerPAD™ packaging - deployed in digital TV power supplies and STB applications.
For engineers reviewing the TPS54227DDAR datasheet, TPS54227DDAR pinout, TPS54227DDAR application, or TPS54227DDAR equivalent, key selection considerations include its 700-kHz switching frequency, 155 mΩ/108 mΩ integrated FET RDS(on), cycle-by-cycle overcurrent protection, prebiased soft-start capability, and thermal shutdown at 165°C - all critical for stable, space-constrained point-of-load regulation.
Technical Context
The TPS54227DDAR implements D-CAP2™ mode control: an adaptive on-time PWM architecture that eliminates external compensation while maintaining stability with ultra-low-ESR ceramic output capacitors. Its internal one-shot timer sets on-time inversely proportional to VIN and proportional to VOUT, enabling pseudo-fixed 700-kHz operation across input and load variations.
It integrates dual N-FETs (155 mΩ high-side, 108 mΩ low-side), a 5.5-V LDO (VREG5) for biasing, and proprietary prebiased soft-start logic that incrementally enables synchronous rectification to prevent output sinking during startup. Protection includes cycle-by-cycle valley-current OCP, non-latching UVLO (3.75 V threshold), and thermal shutdown (165°C).
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 | 2 A continuous - sufficient for powering core logic, DDR memory termination, and SoC I/O domains. |
| Switching Frequency | 700 kHz - enables compact magnetics and EMI filtering while balancing efficiency and thermal performance. |
| High-Side RDS(on) | 155 mΩ - reduces conduction loss at high duty cycles; optimized for lower-VOUT applications (e.g., 1.05 V, 1.2 V). |
| Low-Side RDS(on) | 108 mΩ - minimizes synchronous rectification loss during freewheeling phase. |
| VFB Reference Accuracy | ±1.7% (749–781 mV) - ensures tight output voltage regulation across temperature and line/load conditions. |
| Shutdown Current | <10 μA - enables ultra-low-power standby modes in battery-backed or energy-sensitive systems. |
Pinout & Package
TPS54227DDAR is housed in an 8-pin HSOP (SO PowerPAD™) package measuring 4.89 mm × 3.90 mm with an exposed thermal pad on the underside for enhanced heat dissipation. The package requires soldering the thermal pad to a PCB ground plane for optimal thermal performance (RθJA = 45.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable input | Active-high logic control; internal 220–880 kΩ pull-down enables default disable; 1.6 V threshold ensures noise immunity. |
| 2 - VFB | Feedback input | Monitors output via resistor divider; 0.765 V reference enables precise programmable VOUT from 0.76 V to 7 V. |
| 3 - VREG5 | Bias supply output | 5.5-V regulated LDO (60 mA max); powers internal circuitry and external components; disabled when EN = low. |
| 4 - SS | Soft-start control | Connects to GND via capacitor; 2 μA charge current sets ramp time; supports prebiased startup without output sinking. |
| 5 - GND | Power ground return | Common return for switching node (PGND); must be connected at single-point to minimize noise coupling to analog pins. |
| 6 - SW | Switch node | Drives external inductor; connects internally to both FETs; requires low-inductance layout and 0.1-μF bootstrap cap to VBST. |
| 7 - VBST | Bootstrap supply | Charged via internal diode from VREG5; supplies gate drive for high-side FET; must be decoupled to SW with 0.1-μF ceramic. |
| 8 - VIN | Main input supply | Accepts 4.5–18 V; requires local 10-μF ceramic + optional 0.1-μF HF bypass; feeds both power stage and internal regulators. |
| Exposed Pad | Thermal & PGND connection | Must be soldered to PCB ground plane; serves as primary thermal path and low-impedance return for low-side FET current. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Enables stable operation with zero external compensation and ceramic output capacitors - reducing BOM count and board area. |
| Prebiased soft-start | Prevents reverse current flow during startup when output is precharged; avoids system-level brownout or latch-up in cascaded supplies. |
| Integrated 155 mΩ / 108 mΩ FETs | Eliminates external power switches; optimizes efficiency for 1–3 V outputs where duty cycle is low and conduction loss dominates. |
| Cycle-by-cycle overcurrent protection | Detects low-side FET voltage during freewheeling; provides immediate current limiting without latching - supports robust hot-swap and fault recovery. |
| 700-kHz fixed-frequency operation | Ensures predictable EMI profile and simplifies filter design; maintained across input voltage and load via adaptive on-time algorithm. |
Applications
| Digital TV Power Supply | High-Definition Blu-ray Disc™ Player |
|---|---|
Use Scenario: Supplies 1.05 V core voltage to MPEG decoder SoC and 3.3 V to HDMI interface ICs under dynamic video decoding loads. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise DC from 12 V main rail. Use Value: D-CAP2™'s fast transient response maintains <±15 mV output deviation during 0–2 A load steps, preventing SoC reset or frame drop. |
Use Scenario: Powers laser driver, servo controller, and BD-ROM controller ICs requiring clean, sequenced 1.2 V, 1.8 V, and 5 V rails. IC Role / Device Role / Timing Role: Secondary buck converter generating 1.2 V from 5 V intermediate rail with prebias support for quick resume-from-standby. Use Value: Prebiased soft-start avoids reverse current into powered-up downstream circuits, eliminating need for external OR-ing FETs or diodes. |
| Digital Set Top Box (STB) | Networking Home Terminal |
Use Scenario: Delivers 1.8 V to QAM demodulator and 2.5 V to Ethernet PHY in cable modem–integrated STBs with bursty DOCSIS traffic. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating in forced CCM to maintain ripple <10 mVpp at light loads (10 mA–2 A range). Use Value: 95% peak efficiency and <10 μA shutdown current extend standby runtime and reduce thermal load in sealed enclosures. |
Use Scenario: Provides 3.3 V to Wi-Fi SoC and 1.05 V to ARM Cortex-A9 application processor in residential gateways handling VoIP and IPTV. IC Role / Device Role / Timing Role: Main system regulator converting 12 V adapter input to multiple low-voltage rails via cascaded topology. Use Value: Integrated VREG5 powers auxiliary circuitry (e.g., enable logic, level shifters), eliminating need for discrete LDO and reducing component count by 2–3 parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54229DDAR | Same 8-pin HSOP package, but rated for 2.5 A output and features improved 130 mΩ/80 mΩ FETs; higher current limit (3.5 A typical). | Supports higher-output applications like dual-core processors or multi-rail SoCs where 2 A margin is insufficient. | Select TPS54229DDAR only if >2 A continuous load or tighter thermal budget demands lower RDS(on). |
| MP2315DJ-LF-Z | Monolithic 2 A buck in 8-pin SOIC (no PowerPAD); 4.5–28 V input; fixed 700 kHz; lacks VREG5 and prebiased soft-start. | Suitable for cost-sensitive, non-prebiased designs where external biasing is acceptable and thermal headroom exists. | Choose MP2315DJ-LF-Z only when footprint compatibility is secondary and system does not require VREG5 or prebias support. |
Compared with TPS54227DDAR, TPS54229DDAR offers higher current capability and lower FET losses but shares identical pinout and feature set - making it a direct upgrade path. MP2315DJ-LF-Z provides broader input range and lower cost but sacrifices integrated biasing, thermal performance, and startup robustness.
Availability
TPS54227DDAR is available at Aetrix Electronics and suitable for digital TV power supplies, high-definition Blu-ray players, digital set top boxes (STB), and networking home terminals requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade reliability.
Supply support for TPS54227DDAR 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-reliability power conversion solutions.
The TPS54227DDAR belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for space-constrained, high-efficiency point-of-load regulation in consumer electronics and broadband infrastructure equipment.
FAQ
What is the recommended input capacitor configuration for TPS54227DDAR?
TI recommends a minimum 10-μF ceramic input capacitor placed close to the VIN and GND pins of the TPS54227DDAR, plus an optional 0.1-μF high-frequency ceramic capacitor between VIN and GND for additional noise suppression. The capacitor voltage rating must exceed the maximum input voltage (≥20 V). This configuration ensures low-impedance input sourcing during high di/dt switching events and stabilizes the input rail against upstream source impedance.
Does TPS54227DDAR support prebiased output startup?
Yes, the TPS54227DDAR includes dedicated prebiased soft-start circuitry. When the output voltage is already present at startup, the device gradually enables synchronous rectification by incrementally increasing low-side FET on-time - preventing reverse current flow and avoiding output voltage collapse. This behavior is intrinsic to the TPS54227DDAR's control architecture and requires no external components or configuration.
What is the function of the VREG5 pin on TPS54227DDAR?
The VREG5 pin on the TPS54227DDAR is a 5.5-V, 60-mA integrated LDO that powers internal circuitry and can supply external bias for enable logic, level shifters, or monitoring ICs. It is active only when EN is high and shuts down with the rest of the device during disable. A 1-μF ceramic capacitor to GND is mandatory for stability - this feature eliminates the need for an external bias rail in most TPS54227DDAR applications.
How does the D-CAP2™ control mode in TPS54227DDAR differ from traditional voltage-mode control?
Unlike traditional voltage-mode control requiring external compensation networks, the TPS54227DDAR's D-CAP2™ mode uses adaptive on-time PWM with internal ripple injection to achieve stability with zero external components. It senses output voltage directly at VFB and adjusts on-time based on VIN and VOUT to maintain ~700 kHz frequency - delivering faster transient response (<10 µs recovery), reduced output capacitance requirements, and simplified layout compared to conventional architectures.
What thermal management practices are required for reliable TPS54227DDAR operation?
Reliable TPS54227DDAR operation requires soldering the exposed thermal pad to a solid PCB ground plane with ≥4 thermal vias (0.3-mm diameter, spaced ≤1 mm apart). The pad must connect directly to inner-layer ground planes to achieve RθJA ≤45.3°C/W. Avoid floating or undersized pads - thermal derating begins above 85°C ambient, and junction temperature must stay below 150°C per datasheet limits. Layout guidelines in SLVSAU2C Section 10.2 apply directly to the TPS54227DDAR.
TPS54227DDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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:
- 2A
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS54227DDAR FAQ
1.How can I place an order for TPS54227DDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54227DDAR 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 TPS54227DDAR reliable?
The price and inventory of TPS54227DDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54227DDAR is usually 5 days.
3.What payment methods are accepted for TPS54227DDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54227DDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54227DDAR?
TPS54227DDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54227DDAR 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 TPS54227DDAR?
For technical support, including TPS54227DDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54227DDAR requirements.
6.How does Aetrix verify that TPS54227DDAR is sourced from the original manufacturer or authorized distributors?
All TPS54227DDAR 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 TPS54227DDAR meets industry standards.
7.What is the process for return or replacement of TPS54227DDAR?
All TPS54227DDAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54227DDAR, 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 TPS54227DDAR part is unused and in its original packaging.
Return procedure for TPS54227DDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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