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Texas Instruments TPS55330RTET
- Part No.:
- TPS55330RTET
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
TPS55330RTET.pdf
- Description:
- IC REG BOOST FLYBACK ADJ 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,218
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Product details
Overview
TPS55330RTET from Texas Instruments is a monolithic nonsynchronous boost/SEPIC/flyback DC-DC regulator with an integrated 5-A, 24-V low-side N-channel MOSFET switch. It operates from 2.9 V to 16 V input, delivers up to 5.25 A peak switch current, regulates output voltage via ±0.7% reference (1.229 V), and supports programmable switching frequency from 100 kHz to 1.2 MHz. It is used in Thunderbolt port power docks and industrial 3.3/5/12-V conversion systems.
For engineers reviewing the TPS55330RTET datasheet, TPS55330RTET pinout, TPS55330RTET application, or TPS55330RTET equivalent, key selection considerations include its 3 mm × 3 mm QFN-16 PowerPAD™ package, cycle-by-cycle overcurrent protection with frequency foldback, adjustable soft-start, pulse-skipping for light-load efficiency, and synchronization capability to external clocks up to 1 MHz.
Technical Context
The TPS55330RTET implements fixed-frequency current-mode PWM control with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its transconductance error amplifier (240–440 µS) drives the COMP pin, where an external RC network sets loop stability and transient response.
Switching frequency is set either by an external resistor on FREQ (100–1200 kHz) or synchronized to an external clock (200 kHz–1 MHz) applied to SYNC. Overcurrent protection triggers cycle-by-cycle shutdown at 5.25–7.75 A, followed by frequency foldback to 25% of nominal when FB falls below 0.9 V - disabled during soft-start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9 V to 16 V - supports multicell batteries and regulated 3.3/5/12-V rails without external pre-regulation. |
| Output Switch Rating | 5-A, 24-V N-channel MOSFET - enables high-current boost/SEPIC/flyback topologies with RDS(ON) = 60–120 mΩ. |
| Reference Voltage | 1.229 V ±0.7% - ensures precise output regulation across temperature (±0.006 V drift from –50°C to +150°C). |
| Quiescent Current | 0.5 mA - minimizes standby power loss in always-on industrial or docking applications. |
| Shutdown Current | 2.7 µA - enables ultra-low-power system sleep modes with EN-controlled sequencing. |
| Switching Frequency Range | 100 kHz to 1.2 MHz - allows optimization for size (high-freq) or EMI/efficiency (low-freq), with external sync support. |
| Soft-Start Bias | 6 µA - linearly charges external SS capacitor to control inrush current and limit output overshoot at startup. |
| Thermal Shutdown | 165°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
TPS55330RTET uses a 3 mm × 3 mm, 16-pin WQFN package with exposed PowerPAD™ thermally connected to PGND. The package supports high-power density layouts with low thermal resistance (RθJA = 43.3°C/W, RθJC(bot) = 3.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 2) | Input supply rail | Accepts 2.9–16 V; powers internal circuitry and gate driver - separate from power stage input in SEPIC/flyback. |
| SW (Pins 1,15,16) | Power switch drain node | Connects to inductor/transformer switched side; handles full peak switch current (≤7.75 A) and 24-V blocking. |
| EN (Pin 3) | Enable control input | Logic-level enable with 1.08 V rising threshold and 0.16 V hysteresis; internal 950 kΩ pulldown prevents floating. |
| SS (Pin 4) | Soft-start timing node | 6 µA current source charges external capacitor; clamps COMP until 1.8 V reached to limit startup current. |
| SYNC (Pin 5) | External clock input | Accepts 0–5 V logic signal (10–90% duty); requires FREQ resistor present and external clock within ±20% of programmed freq. |
| AGND (Pin 6) | Analog ground reference | Signal return for FB, COMP, FREQ, SS - must be separated from PGND and tied only at single point. |
| COMP (Pin 7) | Error amplifier output | Transconductance amplifier output (240–440 µS); external RC network sets loop compensation and stability. |
| FB (Pin 8) | Feedback input | Senses output via resistor divider; regulates to 1.229 V reference - determines output voltage accuracy and load regulation. |
| FREQ (Pin 9) | Frequency programming | 1.25 V bias; external resistor to AGND sets switching frequency (e.g., 480 kΩ → ~100 kHz, 40 kΩ → ~1.14 MHz). |
| NC (Pins 10,14) | No-connect terminal | Reserved; TI recommends connecting to AGND to reduce noise coupling and improve thermal conduction. |
| PGND (Pins 11,12,13) | Power ground return | Source connection of internal MOSFET; carries high di/dt currents - must be low-inductance plane under PowerPAD™. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5-A, 24-V low-side switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity in boost/SEPIC designs. |
| Pulse-skipping mode | Maintains high efficiency (>85%) at light loads by skipping PWM cycles - avoids discontinuous conduction instability. |
| Programmable soft-start | Prevents inrush current and output overshoot via user-defined ramp time (e.g., 10 nF → ~18 ms start-up). |
| Frequency foldback protection | Reduces switching frequency to 25% during overcurrent to sustain regulation under overload without thermal shutdown. |
| Internal slope compensation | Enables stable current-mode control at >50% duty cycle without external components - critical for high-VOUT/VIN ratios. |
| Wide –40°C to +150°C TJ | Supports operation in harsh environments including industrial motor drives and automotive under-hood auxiliary supplies. |
Applications
| Thunderbolt™ Power Docking | Industrial 12-V Rail Generation |
|---|---|
Use Scenario: Portable PC or tablet dock supplying 12 V/3 A to peripherals while powered from 5-V USB-C PD source. IC Role / Device Role / Timing Role: Boost converter regulating 5 V input to stable 12 V output using external inductor, Schottky diode, and feedback resistors. Use Value: Delivers 5.25 A peak switch current and 95% efficiency at 2.9–4.2 V input, enabling compact, fanless dock designs. | Use Scenario: Programmable logic controller (PLC) requiring isolated 12-V auxiliary supply from 24-V field bus. IC Role / Device Role / Timing Role: Flyback controller driving transformer primary; secondary provides isolated 12 V with optocoupler feedback. Use Value: Internal 24-V switch withstands 24-V bus transients; frequency sync allows EMI spread-spectrum alignment with main CPU clock. |
| ADSL Modem Power Supply | Portable Medical Sensor Hub |
Use Scenario: DSL line card generating ±12 V and 3.3 V from single 12-V input for analog front-end and digital logic. IC Role / Device Role / Timing Role: SEPIC converter providing non-inverting buck-boost output with inherent input-output isolation. Use Value: 2.9–16 V input range accommodates brownout conditions; ±0.7% reference ensures precise ADC reference voltage generation. | Use Scenario: Battery-powered wearable hub aggregating ECG, SpO₂, and temperature data, requiring 3.3 V from 2-cell Li-ion (6–8.4 V). IC Role / Device Role / Timing Role: Boost regulator stepping down battery voltage to regulated 3.3 V with pulse-skipping for 10-µA standby current. Use Value: 2.7 µA shutdown current extends battery life; –40°C to +150°C rating supports sterilization and body-worn thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5122MH/NOPB | Higher 65-V input rating, external MOSFET required, no integrated switch; 500-kHz fixed frequency. | Better suited for wide-input industrial supplies (e.g., 12–48 V), but requires more external components and layout effort. | Choose LM5122MH/NOPB when input exceeds 16 V or higher reliability under voltage transients is required. |
| TPS61088RHLR | Lower 5.5-V max input, integrated 10-A switch, fixed 500-kHz frequency, no SYNC or FREQ pin. | Optimized for single-cell Li-ion (2.7–5.5 V) to 5/9/12 V; lacks frequency adjustability and sync, limiting EMI control. | Choose TPS61088RHLR for cost-sensitive portable designs with ≤5.5-V input and no need for frequency tuning. |
Compared with LM5122MH/NOPB and TPS61088RHLR, the TPS55330RTET uniquely balances integrated 5-A/24-V switching, 2.9–16-V input flexibility, and full frequency programmability - making it optimal for mid-range industrial and docking applications where BOM simplicity and design adaptability are critical.
Availability
TPS55330RTET is available at Aetrix Electronics and suitable for Thunderbolt™ docking stations, industrial PLC power modules, and ADSL modem auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for TPS55330RTET 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 company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability industrial and automotive power solutions.
The TPS55330RTET belongs to TI's integrated DC-DC regulator product line, designed specifically for compact, high-efficiency boost/SEPIC/flyback conversion in space-constrained industrial and computing applications.
FAQ
What is the maximum output current capability of the TPS55330RTET?
The TPS55330RTET integrates a 5-A, 24-V N-channel MOSFET with a typical current limit threshold of 6.6 A (min 5.25 A, max 7.75 A). In boost configuration, maximum continuous output current depends on input/output voltage ratio and thermal design - e.g., 2.1 A at 5 V output from 2.9–4.2 V input is validated in TI's typical application. Peak switch current must not exceed 7.75 A.
Can the TPS55330RTET be used in flyback topology with primary-side regulation?
Yes, the TPS55330RTET supports isolated flyback configuration using the SW pin to drive the transformer primary. However, it requires optocoupler-based or auxiliary-winding feedback for regulation - the device itself does not implement primary-side sensing. TI provides reference designs (e.g., TIDA-00239) demonstrating this implementation with <1% output regulation error.
How does the frequency foldback feature work in the TPS55330RTET?
When output overload causes FB voltage to drop below 0.9 V, the TPS55330RTET reduces switching frequency to 25% of its programmed value to maintain regulation without thermal shutdown. This foldback remains active until FB rises above 0.9 V - it is disabled during soft-start. Recovery requires removal of overload or power cycling; it does not auto-resume normal frequency.
What is the recommended layout practice for the PowerPAD™ on the TPS55330RTET?
The PowerPAD™ (Pin 17) must be soldered directly to a solid PGND copper area on the PCB. TI recommends using ≥4 thermal vias (0.3-mm diameter, 0.6-mm pitch) connecting the pad to inner-layer ground planes. These vias should be filled or capped to ensure reliable solder joint formation and minimize thermal resistance (RθJC(bot) = 3.5°C/W).
Does the TPS55330RTET support synchronization to an external clock, and what are the requirements?
Yes, the TPS55330RTET accepts external clock signals on the SYNC pin (Pin 5) with logic-high ≥1.2 V and logic-low ≤0.4 V. The external clock frequency must be within ±20% of the frequency set by the FREQ resistor (e.g., if RFREQ sets 600 kHz, SYNC must be 480–720 kHz). A resistor must remain connected from FREQ to AGND during sync operation.
TPS55330RTET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 2.9V
- Voltage - Output (Max):
- 22V
- Current - Output:
- 5.25A (Switch)
- Frequency - Switching:
- 94kHz ~ 1.14MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (3x3)
TPS55330RTET FAQ
1.How can I place an order for TPS55330RTET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS55330RTET 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 TPS55330RTET reliable?
The price and inventory of TPS55330RTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS55330RTET is usually 5 days.
3.What payment methods are accepted for TPS55330RTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS55330RTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS55330RTET?
TPS55330RTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS55330RTET 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 TPS55330RTET?
For technical support, including TPS55330RTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS55330RTET requirements.
6.How does Aetrix verify that TPS55330RTET is sourced from the original manufacturer or authorized distributors?
All TPS55330RTET 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 TPS55330RTET meets industry standards.
7.What is the process for return or replacement of TPS55330RTET?
All TPS55330RTET units undergo pre-shipment inspection (PSI). If there is an issue with TPS55330RTET, 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 TPS55330RTET part is unused and in its original packaging.
Return procedure for TPS55330RTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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