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Texas Instruments TPS62684YFFT
- Part No.:
- TPS62684YFFT
- Manufacturer:
- Texas Instruments
- Package:
- 6-UFBGA, DSBGA
- Datasheet:
-
TPS62684YFFT.pdf
- Description:
- IC REG BUCK 2.85V 1.6A 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
TPS62684YFFT from Texas Instruments is a 5.5-MHz synchronous step-down DC-DC converter optimized for Li-ion–powered portable devices, delivering up to 1600 mA at fixed 2.85 V output with ±2% DC accuracy, 5.8 mA quiescent current, and total solution size under 12 mm² using only three surface-mount components.
For engineers reviewing the TPS62684YFFT datasheet, TPS62684YFFT pinout, TPS62684YFFT application, or TPS62684YFFT equivalent, key selection criteria include its spread-spectrum PWM dithering for EMI reduction, active output discharge (12 Ω), 6-pin NanoFree™ WCSP package (1.431 mm × 1.135 mm), and operation across 3.25 V–5.5 V input range with best-in-class load transient response.
Technical Context
The TPS62684YFFT employs a frequency-locked ring-oscillating modulator architecture-eliminating traditional loop compensation-to achieve instantaneous load/line transient response and inherent stability across inductor (0.3–1.2 µH) and output capacitor (3–30 µF) variations. It integrates high-side (95–155 mΩ) and low-side (75–155 mΩ) MOSFETs with undervoltage lockout (2.1 V typ.), thermal shutdown (140 °C), and short-circuit protection with auto-restart.
Its spread-spectrum modulation dithers switching frequency by ±10% around 5.5 MHz using a triangle-profile scheme (fm ≈ 44 kHz) to reduce peak conducted/radiated EMI. The device supports pre-biased start-up and features an internal soft-start ramp (150 µs to 95% VOUT) with reduced current limit during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 3.25 V to 5.5 V - supports single-cell Li-ion (3.6 V nominal) and 5 V rails without external regulation |
| VOUT | Fixed 2.85 V - eliminates external feedback resistors; ±2% total DC accuracy ensures stable core voltage for RF ICs and processors |
| Max Output Current | 1600 mA - enables direct power delivery to high-current subsystems like cellular transceivers or display drivers |
| Switching Frequency | 5.5 MHz nominal - allows use of ultra-small 0.47 µH chip inductors (e.g., 0805 size) and minimizes output ripple |
| Quiescent Current | 5.8 mA - maintains high efficiency at light loads typical in always-on mobile peripherals |
| Efficiency Peak | 98% at 400 mA (VIN = 5.0 V) - reduces thermal stress and extends battery runtime in compact handhelds |
| Package | 6-pin NanoFree™ WCSP (YFF) - 1.431 mm × 1.135 mm footprint with sub-1 mm profile for ultra-thin designs |
Pinout & Package
TPS62684YFFT uses a 6-pin DSBGA (NanoFree™ WCSP) package measuring 1.431 mm × 1.135 mm with 0.4 mm pitch. Bottom-side solder balls enable minimal PCB area usage and excellent thermal conduction to the board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A2) | Main power input | Connects to input rail (3.25–5.5 V); requires local 0.5 µF ceramic decoupling to GND |
| AVIN (A1) | Bias supply input | Must be tied directly to VIN; powers internal control circuitry independently of power stage |
| SW (B1) | Power switch node | Connects to inductor; carries high-frequency AC current; layout critical for EMI and efficiency |
| FB (C1) | Output voltage sense | Internally connected to fixed 2.85 V divider; no external resistors required |
| EN (B2) | Enable control | Active-high logic; must be terminated (not floating); initiates soft-start and activates output discharge |
| GND (C2) | Power ground | Primary return path for power and control circuits; requires low-impedance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum PWM dithering | ±10% frequency modulation around 5.5 MHz reduces peak EMI harmonics by >10 dB, easing FCC/CE compliance in cellular handsets |
| Active output discharge | Integrated 12 Ω discharge path engages after shutdown, clearing VOUT within milliseconds-critical for multi-rail sequencing |
| Pre-biased start-up capability | Starts safely into existing output voltage without reverse current, enabling hot-swap and power-domain isolation |
| Ultra-small BOM | Only three external components required: one 0.47 µH inductor + two ceramic capacitors (1.5 µF input, 10 µF output)-reduces bill-of-material cost and assembly steps |
| High PSRR & transient response | Delivers <15 mV undershoot/overshoot on 10 mA → 800 mA load steps-stabilizes sensitive RF and audio circuitry without additional LDOs |
Applications
| Cellular Transceiver Power | Mobile Application Processor Core |
|---|---|
Use Scenario: Powers LTE/WCDMA transceiver ICs requiring clean, tightly regulated 2.85 V at up to 1.2 A peak current during TX bursts. IC Role / Device Role / Timing Role: Primary buck regulator supplying RF front-end bias; operates in forced PWM mode to maintain constant frequency during burst transmission. Use Value: Spread-spectrum operation suppresses narrowband noise that would otherwise desensitize adjacent receive bands, while 5.5 MHz switching avoids interference with IF frequencies. | Use Scenario: Supplies core voltage to application processors (e.g., ARM Cortex-A series) in smartphones and tablets during dynamic DVFS scaling. IC Role / Device Role / Timing Role: Main system PMIC buck channel delivering 2.85 V with fast load transient response to track CPU current spikes. Use Value: Sub-150 µs soft-start and <100 ns load-step response prevent processor brownouts during clock frequency jumps, ensuring deterministic boot and performance. |
| WLAN/Bluetooth® Coexistence Module | Portable Digital TV Tuner |
Use Scenario: Powers integrated WLAN/Bluetooth combo chips sharing antenna and RF sections in compact wearables and dongles. IC Role / Device Role / Timing Role: Dedicated low-noise power rail; leverages active discharge to meet fast power-down timing requirements in Bluetooth LE sleep cycles. Use Value: 12 Ω internal discharge clears VOUT in <1 ms, enabling rapid entry into deep-sleep states and reducing system standby current below 1 µA. | Use Scenario: Supplies 2.85 V to digital demodulator ICs in handheld DVB-T/T2 receivers where EMI must not corrupt QAM constellation diagrams. IC Role / Device Role / Timing Role: Clean intermediate rail between battery and analog tuner; operates with minimal input/output capacitance to fit tight form factors. Use Value: Total solution size <12 mm² (inductor + caps) fits within 10 mm × 12 mm PCB area constraints, while 98% peak efficiency extends viewing time on single charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62683YFFT | Fixed 2.7 V output; identical package, pinout, and specs otherwise | Suitable for SoCs requiring 2.7 V I/O or memory rails instead of 2.85 V | Select when target load requires 2.7 V with same size/performance envelope |
| TPS62864DSC | 3.3 V fixed output; 2.0 mm × 1.7 mm WSON-10 package; 4-A capability | Higher current and different voltage-requires PCB redesign and new inductor/cap selection | Choose only if system needs >1.6 A or 3.3 V rail; not drop-in compatible |
Compared with TPS62683YFFT, the TPS62684YFFT provides 150 mV higher output for improved noise margin in 2.85 V–biased RF stages; compared with TPS62864DSC, it offers smaller footprint and lower quiescent current but less output current headroom-making it optimal for space-constrained 2.85 V mobile subsystems.
Availability
TPS62684YFFT is available at Aetrix Electronics and suitable for cellular transceivers, mobile application processors, WLAN/Bluetooth coexistence modules, and portable digital TV tuners requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS62684YFFT 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The TPS62684YFFT belongs to TI's NanoPower™ high-frequency buck converter family, engineered specifically for ultra-compact, battery-powered portable electronics where minimal PCB area, low EMI, and fast transient response are mandatory design requirements.
FAQ
What is the recommended inductor value for TPS62684YFFT?
The TPS62684YFFT is optimized for 0.47 µH or 0.56 µH inductors (e.g., TOKO DFE252012P-R47M). The datasheet specifies an effective inductance range of 0.3 µH to 1.2 µH. Using 0.47 µH achieves the best balance of transient response, efficiency, and solution size. Larger values reduce ripple but slow load-step response; smaller values increase ripple and may compromise stability.
Does TPS62684YFFT support pre-biased start-up?
Yes, the TPS62684YFFT supports pre-biased start-up. When enabled into an already charged output, it begins switching once the internal reference reaches ~90% of the present VOUT level, then ramps to 2.85 V without forcing reverse current. This behavior is confirmed in Section 9.4.1 of the SLVSAC5 datasheet and enables safe integration in multi-rail systems with independent power sequencing.
What is the purpose of the AVIN pin on TPS62684YFFT?
The AVIN pin on the TPS62684YFFT supplies bias power to the internal control circuitry independently from the main power switch (VIN). It must be connected directly to VIN. This separation improves noise immunity and ensures stable operation of the oscillator, feedback comparator, and logic blocks even under heavy switching transients on the power path.
How does the spread-spectrum feature of TPS62684YFFT reduce EMI?
The TPS62684YFFT spreads its 5.5 MHz switching frequency by ±10% using triangle-profile modulation (fm ≈ 44 kHz). This distributes energy across a ~1.1 MHz band instead of concentrating it at discrete harmonics, lowering peak radiated/conducted emissions by >10 dB. As shown in Figure 24–25 of SLVSAC5, this converts narrowband noise into broadband "white noise" that is easier to filter and meets stringent cellular EMI standards.
What is the function of the internal discharge resistor in TPS62684YFFT?
The TPS62684YFFT includes an integrated 12 Ω discharge resistor activated after the first enable cycle. When EN is pulled low, this resistor actively discharges the output capacitor, clearing VOUT rapidly-typically within 1–2 ms for a 10 µF CO. This prevents residual voltage from interfering with downstream logic states or violating power sequencing requirements in multi-voltage systems.
TPS62684YFFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.6A
- Frequency - Switching:
- 5.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DSBGA
TPS62684YFFT FAQ
1.How can I place an order for TPS62684YFFT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS62684YFFT 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 TPS62684YFFT reliable?
The price and inventory of TPS62684YFFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS62684YFFT is usually 5 days.
3.What payment methods are accepted for TPS62684YFFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS62684YFFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS62684YFFT?
TPS62684YFFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS62684YFFT 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 TPS62684YFFT?
For technical support, including TPS62684YFFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS62684YFFT requirements.
6.How does Aetrix verify that TPS62684YFFT is sourced from the original manufacturer or authorized distributors?
All TPS62684YFFT 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 TPS62684YFFT meets industry standards.
7.What is the process for return or replacement of TPS62684YFFT?
All TPS62684YFFT units undergo pre-shipment inspection (PSI). If there is an issue with TPS62684YFFT, 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 TPS62684YFFT part is unused and in its original packaging.
Return procedure for TPS62684YFFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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