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Texas Instruments TPS54900PWR
- Part No.:
- TPS54900PWR
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54900PWR.pdf
- Description:
- IC REG BCK PROG 100MA QD 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
TPS54900PWR from Texas Instruments is a quad-channel, voltage-mode PWM step-down converter IC with integrated 0.8 Ω high-side PMOSFETs, programmable 7.5 V–13.1 V outputs in 400-mV steps via 4-wire serial interface, and pass-through mode for VIN routing to any output - designed for ADSL line driver power management in central office systems.
For engineers reviewing the TPS54900PWR datasheet, TPS54900PWR pinout, TPS54900PWR application, or TPS54900PWR equivalent, key selection considerations include per-channel programmability, synchronous PWM operation at 552 kHz, thermal shutdown at 150°C, global/individual channel enable control, and compatibility with AC5 chipset-based line card architectures.
Technical Context
The TPS54900PWR implements four independent voltage-mode PWM controllers with internal ramp generation, bandgap reference, and four DACs driving individual feedback loops. Each channel uses an integrated PMOSFET (rDS(on) = 0.8 Ω typ.) and supports soft-start with 200-mV incremental voltage transitions.
Serial command protocol enables global or per-channel programming of output voltage codes (0x0–0xE for 7.5–13.1 V; 0xF for pass-through), status readback, phase stagger initialization, and overcurrent fault reporting. Synchronization is achieved by dividing an external 4.416 MHz SCLK by eight to generate a precise 552 kHz PWM clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 4 independent buck regulators, each with dedicated LX, FB, and programmable voltage setpoint |
| Output voltage range | 7.5 V to 13.1 V in 400-mV increments (15 discrete levels), plus pass-through mode to route VIN directly |
| Max output current per channel | 100 mA continuous - sufficient for low-power ADSL line driver biasing without external boost stages |
| Switching frequency | 552 kHz when synchronized to 4.416 MHz SCLK; free-run mode at 450 kHz nominal - enables predictable EMI filtering |
| PMOSFET rDS(on) | 0.8 Ω typical - minimizes conduction loss at 100 mA, supporting >90% efficiency in typical ADSL load conditions |
| Overcurrent threshold | 250–750 mA per channel - provides robust short-circuit protection while avoiding nuisance trips during transient line events |
| Operating temperature | −40°C to +85°C ambient - qualified for central office environments with extended thermal cycling requirements |
Pinout & Package
TSSOP-16 (PW) package, 5.0 mm × 4.4 mm × 1.2 mm body height, JEDEC MO-153 compliant, RoHS/Green (no Sb/Br) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX0–LX3 | Channel switch node outputs | Connect to inductor and catch diode per channel; high dv/dt nodes requiring tight layout to GND |
| FB0–FB3 | Per-channel feedback inputs | Monitor output voltage divider ratio; internal error amplifier compares to DAC-set reference |
| VIN | Main supply input | 14.25–16 V input; powers internal bias, logic, and all four PMOSFET sources |
| EN | Global enable input | Logic-high (>2.0 V) enables regulation; pulled >VIN − 0.5 V forces all channels into pass-through mode |
| CBS | Channel bank select | Determines ADR2 address mapping for multi-device 8-channel configurations (low = ADR2=0; high = ADR2=1) |
| SCLK/SDI/SFS/SDO | 4-wire serial interface | Asynchronous frame-sync protocol: 16-bit words, falling-edge sampling, open-drain SDO with status readback |
| GND | Power and analog ground | Single ground plane required; pins 3, 5, 8, 9, 10, 18, 21 on evaluation module confirm star grounding best practice |
Key Features
| Feature | Design Value |
|---|---|
| Four independent programmable outputs | Enables per-line supply optimization in multi-port ADSL line cards, reducing total system power by eliminating fixed headroom |
| Pass-through mode (VIN → output) | Eliminates switching loss during high-peak-voltage transmission; maintains line readiness without startup delay |
| Phase-stagger initialization | Reduces input ripple current by up to 50% when two TPS54900PWR devices operate as an 8-channel unit |
| Real-time channel status reporting | SDO returns 0x00 only when output is settled within regulation window - enables deterministic firmware sequencing |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and re-enables at 140°C - prevents thermal runaway in enclosed CO chassis |
Applications
| ADSL Central Office Line Card | Software-Defined Line Provisioning |
|---|---|
|
Use Scenario: Powering THS7102 ADSL line drivers in AC5 chipset-based central office line cards with dynamic per-port voltage assignment. IC Role / Device Role / Timing Role: Quad-channel programmable buck regulator providing individually adjustable 7.5–13.1 V supplies synchronized to system clock. Use Value: Reduces average supply headroom by up to 3.5 V per line versus fixed 15 V rails, cutting total card power by >25% under partial load. |
Use Scenario: Remote reconfiguration of line driver supply voltages via serial interface during service activation or fault recovery. IC Role / Device Role / Timing Role: Serial-programmable voltage source enabling software-defined power policy without hardware changes. Use Value: Eliminates need for manual jumper settings or component swaps; supports zero-touch provisioning across heterogeneous DSLAM deployments. |
| Multi-Port ADSL Aggregation | LineRanger-Enabled Dynamic Range Control |
|
Use Scenario: Eight-channel power delivery using two TPS54900PWR devices with CBS pin differentiation and phase-staggered PWM. IC Role / Device Role / Timing Role: Paired quad-buck ICs operating as coordinated 8-channel unit with interleaved switching to minimize input capacitor stress. Use Value: Cuts peak input ripple current by 42%, allowing smaller 10 µF bulk capacitors instead of 22 µF - saving board area and cost. |
Use Scenario: Adaptive supply modulation during LineRanger operation where line driver quiescent current drops below 10 mA. IC Role / Device Role / Timing Role: Fast-transitioning regulator that switches between regulated mode (7.5–13.1 V) and pass-through mode (<100 µs settling). Use Value: Maintains full line driver bandwidth during low-current states while avoiding discontinuous conduction mode instability and output ringing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel programmable buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54821RHLR | Single-channel, 20-V input, 3-A output; no serial interface; fixed or resistor-programmed VOUT | Not suitable for per-channel programmability or multi-device synchronization; requires external DACs for voltage tuning | Select only if high-current single-rail needs outweigh quad-channel flexibility and serial control |
| LM27402MHX/NOPB | Two-channel, 4.5–20 V input, 3-A/channel; I²C interface; no pass-through mode; different pinout and compensation scheme | Lacks VIN-to-output bypass capability and phase-stagger support; requires redesign of feedback network and layout | Consider only for dual-rail applications where 100-mA per channel is excessive and serial bus bandwidth is constrained |
Compared with TPS54900PWR, TPS54821RHLR offers higher current but no multi-channel coordination, while LM27402MHX/NOPB provides I²C convenience at the cost of missing critical ADSL-specific features like pass-through mode and CBS-controlled 8-channel expansion.
Availability
TPS54900PWR is available at Aetrix Electronics and suitable for ADSL line card manufacturing, central office equipment refurbishment, and software-defined broadband infrastructure requiring stable component supply with long-term lifecycle support.
Supply support for TPS54900PWR 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 connectivity technologies, with decades of experience in communications infrastructure ICs.
The TPS54900PWR belongs to TI's ADSL power management product line, engineered specifically to replace fixed-voltage supplies in central office line cards with digitally controllable, energy-optimized multi-channel regulation.
FAQ
What is the maximum input voltage rating for the TPS54900PWR?
The TPS54900PWR has an absolute maximum VIN rating of 18 V, with recommended operating range from 14.25 V to 16 V. Operation above 16 V may reduce reliability and is not supported per datasheet SLVS405. The UVLO threshold is 13.5 V typical, ensuring clean startup only when input stabilizes within specification.
Does the TPS54900PWR support true pin-to-pin replacement with other TI quad-buck converters?
No, the TPS54900PWR does not have pin-to-pin alternatives within TI's portfolio. Its TSSOP-16 pinout - including dedicated LX0–LX3, FB0–FB3, CBS, and 4-wire serial interface - is unique to this device family. Substitution requires PCB layout revision and firmware adaptation due to incompatible signal mapping and command protocol.
How does the TPS54900PWR handle overcurrent events on individual channels?
Each channel of the TPS54900PWR monitors its own PMOSFET current with a trip threshold of 250–750 mA. Upon detection, it enters hiccup mode for 170–360 ms before retrying. The fault is reported via non-zero status byte on SDO, and the affected channel remains disabled until cleared by serial command or EN toggle - preserving operation of unaffected channels.
Can the TPS54900PWR operate without an external clock source?
Yes, the TPS54900PWR operates in free-run mode at 450 kHz nominal when SCLK is unconnected or held static. However, synchronous operation at 552 kHz (via 4.416 MHz SCLK) is required for phase-stagger initialization, deterministic timing, and optimal EMI performance in multi-device configurations - making external clock mandatory for full feature utilization.
What is the purpose of the CBS pin on the TPS54900PWR?
The CBS (Channel Bank Select) pin on the TPS54900PWR determines how the ADR2 bit in serial commands maps to physical device addressing. When CBS < 0.8 V, ADR2 = 0 selects the device; when CBS > 2.0 V, ADR2 = 1 selects it - enabling two TPS54900PWR ICs to function as a unified 8-channel unit with shared serial bus and phase-staggered PWM clocks.
TPS54900PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 14.25V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 7.5V
- Voltage - Output (Max):
- 13.1V
- Current - Output:
- 100mA
- Frequency - Switching:
- 450kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
TPS54900PWR FAQ
1.How can I place an order for TPS54900PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54900PWR 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 TPS54900PWR reliable?
The price and inventory of TPS54900PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54900PWR is usually 5 days.
3.What payment methods are accepted for TPS54900PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54900PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54900PWR?
TPS54900PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54900PWR 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 TPS54900PWR?
For technical support, including TPS54900PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54900PWR requirements.
6.How does Aetrix verify that TPS54900PWR is sourced from the original manufacturer or authorized distributors?
All TPS54900PWR 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 TPS54900PWR meets industry standards.
7.What is the process for return or replacement of TPS54900PWR?
All TPS54900PWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS54900PWR, 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 TPS54900PWR part is unused and in its original packaging.
Return procedure for TPS54900PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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