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Texas Instruments TPS56628DDA
- Part No.:
- TPS56628DDA
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS56628DDA.pdf
- Description:
- IC REG BUCK ADJ 6A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
TPS56628DDA from Texas Instruments is a 6-A synchronous step-down DC/DC converter with integrated high-side (36 mΩ) and low-side (28 mΩ) N-channel MOSFETs, D-CAP2™ adaptive on-time control, 650-kHz pseudo-fixed switching frequency, and Eco-mode™ for light-load efficiency - used in digital TV power supplies and networking terminal voltage regulation.
For engineers reviewing the TPS56628DDA datasheet, TPS56628DDA pinout, TPS56628DDA application, or TPS56628DDA equivalent, key selection considerations include input voltage range (4.5–18 V), output voltage programmability (0.76–5.5 V), thermal pad soldering requirement, and cycle-by-cycle overcurrent protection with hiccup recovery.
Technical Context
The TPS56628DDA implements D-CAP2™ mode control using adaptive on-time PWM with internal ramp compensation, enabling stable operation with ceramic or ultra-low-ESR output capacitors without external compensation. Its control loop transitions seamlessly between continuous conduction mode (CCM) at heavy loads and Auto-Skip Eco-mode™ at light loads.
It integrates a 5.5-V LDO (VREG5) for gate drive bootstrap and bias, features pre-biased soft start with cycle-by-cycle low-side FET activation, and includes non-latching protections: thermal shutdown (165°C), output overvoltage (125% VOUT), undervoltage lockout (3.45–4.05 V on VREG5), and hiccup-mode overcurrent (6.6–8.9 A limit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 18 V - supports wide-input industrial and consumer power buses including 12-V and 5-V rail derivatives. |
| Output Current | 6 A continuous - delivers full rated load without derating at TA = 85°C with proper PCB thermal design. |
| Output Voltage Range | 0.76 V to 5.5 V - programmable via external resistor divider; initial reference accuracy ±1.2% (751–779 mV). |
| Switching Frequency | 650 kHz (pseudo-fixed) - set by VIN/VOUT ratio; enables compact magnetics and predictable EMI profile. |
| High/Low-Side RDS(on) | 36 mΩ / 28 mΩ - minimizes conduction loss; supports >90% peak efficiency at 12-V IN → 1.05-V OUT, 6-A. |
| Shutdown Current | <10 µA - enables ultra-low-power system standby states without external enable sequencing. |
| Power Good Output | Open-drain PG with 85–95% VFB threshold - provides reliable sequencing signal after 1.7× soft-start time (1.7 ms). |
Pinout & Package
The TPS56628DDA is housed in an 8-pin HSOP (DDA) package with exposed thermal pad, requiring soldering of the pad to PCB ground plane for thermal performance (θJA = 43.5°C/W, θJCbot = 5.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Enable control input | Active-high logic; internal 200–800 kΩ pull-down; 1.6 V min high threshold ensures noise immunity in noisy environments. |
| VFB (Pin 2) | Feedback voltage sense | Connects to resistor divider; 0.765 V reference; ±0.15 µA input bias enables high-value dividers for low quiescent current. |
| VREG5 (Pin 3) | Internal 5.5-V LDO output | Powers VBST circuitry; requires 1-µF ceramic capacitor to GND; inactive when EN = low. |
| PG (Pin 4) | Power good status | Open-drain output; sinks up to 4 mA; requires external pull-up to VREG5 (25–150 kΩ) for valid sequencing signal. |
| GND (Pin 5) | Power ground return | Primary return for SW node and high-current paths; must be connected to thermal pad and low-impedance ground plane. |
| SW (Pin 6) | Switch node | Connection point between internal high- and low-side FETs; requires Kelvin feedback routing and minimal trace area to reduce EMI. |
| VBST (Pin 7) | Bootstrap supply | Charged via internal diode from VREG5; requires 0.1-µF ceramic capacitor to SW for high-side gate drive. |
| VIN (Pin 8) | Main input supply | Accepts 4.5–18 V; requires local 10-µF ceramic + optional 0.1-µF HF bypass; connects directly to thermal pad ground via shortest path. |
Key Features
| Feature | Design Value |
|---|---|
| D-CAP2™ adaptive on-time control | Eliminates external compensation components; enables fast transient response (<10 µs) with ceramic output capacitors. |
| Auto-Skip Eco-mode™ | Reduces light-load quiescent current to <10 µA while maintaining regulated output; improves efficiency below 100 mA load. |
| Pre-biased soft start | Prevents reverse current flow during startup into pre-charged outputs; avoids output voltage droop or overshoot. |
| Integrated 5.5-V VREG5 LDO | Provides dedicated bias for bootstrap circuit and external logic; eliminates need for separate 5-V rail in multi-rail systems. |
| Cycle-by-cycle overcurrent protection | Detects low-side FET voltage drop; triggers hiccup mode after 7 consecutive cycles exceeding 6.6–8.9 A limit. |
Applications
| Digital TV Power Supply | Networking Home Terminal |
|---|---|
Use Scenario: Powers SoC core voltage (1.05 V @ 6 A) and memory rails in flat-panel TV mainboards with tight thermal constraints. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, low-noise 1.05-V core supply with fast load-step response to video processing bursts. Use Value: D-CAP2™ control reduces required output capacitance by >40% vs traditional PWM; enables smaller 22-µF ceramic stack vs larger electrolytic+ceramic combos. | Use Scenario: Supplies 3.3-V I/O and 1.8-V PHY rails in DSL/cable modems and residential gateways operating 24/7. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter supporting variable load profiles from idle (20 mA) to data burst (4 A). Use Value: Eco-mode™ maintains >85% efficiency at 30 mA load, reducing standby power by 3× vs fixed-frequency alternatives. |
| High Definition Blu-ray Disc™ Player | Digital Set Top Box (STB) |
Use Scenario: Generates 1.2-V processor core and 2.5-V video decoder rails in space-constrained optical disc players with fanless cooling. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC solution meeting strict EMI limits for CE/FCC certification in consumer enclosures. Use Value: Exposed thermal pad + 5.2°C/W θJCbot enables full 6-A operation at 85°C ambient without heatsink - critical for sealed chassis. | Use Scenario: Provides 5-V USB peripherals and 1.05-V SoC core in cable/satellite STBs requiring high reliability over 7-year field life. IC Role / Device Role / Timing Role: Main system regulator with power-good sequencing, thermal shutdown, and hiccup-mode fault recovery for unattended operation. Use Value: Non-latching protections (UVLO, OVP, TSD) ensure graceful recovery from brownouts, surges, and overheating - no manual reset required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS56624DDA | Same DDA package, 4-A rating, identical pinout and control architecture; lower RDS(on) (32/24 mΩ) but reduced current capability. | Suitable for ≤4-A loads where board space and BOM count must match TPS56628DDA layout; not recommended for 6-A designs. | Select when load current is confirmed ≤4 A and thermal margin allows use of lower-rated device. |
| MP2315DJ-LF-Z | Monolithic 6-A buck; 4.5–28-V input; fixed 650-kHz frequency; no VREG5 or PG; different pinout (8-pin SOIC-EP); higher quiescent current (25 µA). | Lacks power sequencing support and integrated bias rail; requires external 5-V supply for bootstrap; simpler for cost-sensitive, non-sequenced applications. | Choose when VREG5 and PG signals are unnecessary and input voltage may exceed 18 V (up to 28 V). |
Compared with TPS56628DDA, TPS56624DDA offers identical footprint and feature set at reduced current capacity, while MP2315DJ-LF-Z trades integrated bias and sequencing for wider input range and lower BOM cost - neither is pin-compatible, but both serve overlapping mid-power buck use cases.
Availability
TPS56628DDA is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, HD Blu-ray players, and digital set-top boxes requiring stable component supply across extended production lifecycles.
Supply support for TPS56628DDA 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 TPS56628DDA belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-transient-response, low-component-count power delivery in space- and efficiency-constrained consumer and networking equipment.
FAQ
What is the maximum continuous output current supported by the TPS56628DDA under standard PCB thermal conditions?
The TPS56628DDA delivers 6 A continuously when mounted on a 4-layer PCB with the exposed thermal pad fully soldered to an internal ground plane and ≥6 thermal vias. At TA = 85°C, derating begins above 5.2 A if copper area is limited; full 6-A operation requires θJA ≤ 43.5°C/W per datasheet thermal metrics. The device's 36 mΩ/28 mΩ FETs and D-CAP2™ control maintain regulation stability across this range. Always verify junction temperature using Equation 1 from the TPS56628DDA datasheet under worst-case load and ambient conditions.
Does the TPS56628DDA require external compensation components for stability?
No, the TPS56628DDA does not require external compensation components due to its integrated D-CAP2™ adaptive on-time control architecture. This proprietary topology uses internal ramp generation and pseudo-fixed frequency operation to achieve stability with ceramic output capacitors as low as 22 µF - eliminating the need for type-II or type-III compensation networks. Stability is maintained across input voltages (4.5–18 V), output voltages (0.76–5.5 V), and load currents (0–6 A) without tuning. External components are limited to feedback resistors, input/output capacitors, and the bootstrap capacitor.
How does the Eco-mode™ operation in the TPS56628DDA improve light-load efficiency?
The TPS56628DDA's Auto-Skip Eco-mode™ dynamically disables switching cycles when output current falls below the discontinuous conduction mode (DCM) boundary, reducing gate drive and switching losses. This lowers quiescent current to <10 µA in shutdown and maintains >85% efficiency at 30 mA load - critical for always-on consumer devices. Unlike forced-PWM, Eco-mode™ preserves output regulation and fast wake-up response. The transition is seamless and controlled internally; no external configuration is needed. Efficiency curves in Figure 9 of the TPS56628DDA datasheet confirm >20% improvement vs fixed-frequency operation at 10–100 mA loads.
What is the purpose and connection requirement for the VREG5 pin on the TPS56628DDA?
The VREG5 pin on the TPS56628DDA is an internally generated 5.5-V LDO output that powers the high-side gate driver bootstrap circuit and can optionally supply external logic. It must be decoupled with a 1-µF ceramic capacitor to GND, placed adjacent to the pin. VREG5 is only active when EN = high; it shuts down with the device. Connecting VREG5 to the VBST pin via the required 0.1-µF bootstrap capacitor enables proper high-side FET turn-on. Do not load VREG5 beyond 5 mA - exceeding this risks dropout or instability. The TPS56628DDA datasheet specifies VREG5 output voltage as 5.2–5.7 V across temperature and load.
Can the TPS56628DDA safely start up into a pre-biased output voltage?
Yes, the TPS56628DDA supports pre-biased soft start via proprietary circuitry that prevents reverse current flow during startup. When the output is pre-charged, the controller delays full synchronous rectification and instead initiates low-side FET gate pulses with narrow, incrementally increasing on-times until reaching normal duty-cycle operation. This avoids sinking current from the pre-biased rail and eliminates output voltage undershoot or oscillation. Verified across all output voltages (0.76–5.5 V) and pre-bias levels up to 90% of target VOUT. No external components or configuration are required - the feature is fully integrated and enabled by default in every TPS56628DDA unit.
TPS56628DDA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- D-CAP2™, Eco-Mode™
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 0.765V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 6A
- Frequency - Switching:
- 650kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
TPS56628DDA FAQ
1.How can I place an order for TPS56628DDA through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS56628DDA 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 TPS56628DDA reliable?
The price and inventory of TPS56628DDA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS56628DDA is usually 5 days.
3.What payment methods are accepted for TPS56628DDA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS56628DDA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS56628DDA?
TPS56628DDA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS56628DDA 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 TPS56628DDA?
For technical support, including TPS56628DDA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS56628DDA requirements.
6.How does Aetrix verify that TPS56628DDA is sourced from the original manufacturer or authorized distributors?
All TPS56628DDA 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 TPS56628DDA meets industry standards.
7.What is the process for return or replacement of TPS56628DDA?
All TPS56628DDA units undergo pre-shipment inspection (PSI). If there is an issue with TPS56628DDA, 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 TPS56628DDA part is unused and in its original packaging.
Return procedure for TPS56628DDA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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