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Texas Instruments TPS54900PWRG4
- Part No.:
- TPS54900PWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54900PWRG4.pdf
- Description:
- IC REG BCK PROG 100MA QD 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,135
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Product details
Overview
TPS54900PWRG4 from Texas Instruments is a four-channel, voltage-mode PWM step-down converter IC with integrated 0.8 Ω high-side PMOSFETs, programmable 7.5 V to 13.1 V outputs in 400-mV steps, and pass-through mode for direct VIN routing-designed specifically for ADSL line driver power management in central office systems.
For engineers reviewing the TPS54900PWRG4 datasheet, TPS54900PWRG4 pinout, TPS54900PWRG4 application, or TPS54900PWRG4 equivalent, this page delivers verified technical context, real-world timing behavior, serial interface protocol details, thermal shutdown thresholds, and channel-specific regulation accuracy per TI SLVS405.
Technical Context
The TPS54900PWRG4 implements independent voltage-mode PWM control per channel using internal bandgap-referenced DACs and ramp-based comparators. Each channel features dedicated feedback (FB0–FB3), programmable soft-start via 200-mV DAC stepping, and synchronous operation locked to an external SCLK signal divided by eight (552 kHz nominal).
It integrates global thermal shutdown at 150°C (10°C hysteresis), per-channel overcurrent protection (250–750 mA trip), and UVLO with 13.5 V threshold and 1.45 V hysteresis. The serial interface uses 4-wire frame-sync protocol (SFS/SDI/SCLK/SDO) with open-drain SDO status reporting and CBS pin for dual-device 8-channel phase staggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | Four independent buck regulators, each with dedicated LX and FB pins for discrete LC filter design. |
| Output voltage range | 7.5 V to 13.1 V in 400-mV increments (15 codes), plus pass-through mode for full VIN delivery. |
| Max output current per channel | 100 mA continuous-suitable for low-current ADSL line driver biasing without external current boosting. |
| PMOSFET rDS(on) | 0.8 Ω typical-enables >90% efficiency at 100 mA with 15 V input and 12 V output (per Figure 1 efficiency curve). |
| Synchronization frequency | 552 kHz (SCLK/8); minimum SCLK = 4.416 MHz required to avoid chaotic PWM operation. |
| Regulation accuracy | ±2.5% for codes <12.3 V; ±2% for 12.3–13.1 V-tight enough for precise THS7102 line driver supply headroom control. |
| Thermal shutdown | 150°C junction trip with 10°C hysteresis-protects against sustained overload in confined line card environments. |
Pinout & Package
TSSOP-16 (PW) package, 5.0 mm × 4.4 mm × 1.2 mm body, JEDEC MO-153 compliant, RoHS/Green (no Sb/Br), MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX0–LX3 | Switch node outputs | High-side PMOS drain connections-each drives its own inductor/catch diode network; not internally connected. |
| FB0–FB3 | Feedback inputs | Resistive divider inputs for closed-loop regulation; each tied to respective channel's output LC filter. |
| VIN | Main supply input | 14.25–16 V input powering all four channels and internal bias circuitry; also routed to LX during bypass mode. |
| EN | Global enable | Active-high logic input; pull >2.0 V to enable regulation; pull >VIN − 0.5 V to force all channels into pass-through mode. |
| CBS | Channel bank select | Logic-level input that selects ADR2 mapping for dual-device 8-channel configuration-low = ADR2=0, high = ADR2=1. |
| SFS / SCLK / SDI / SDO | Serial interface | 4-wire frame-sync interface: SFS strobes command start, SCLK clocks data, SDI receives 16-bit words, SDO returns open-drain status byte. |
| GND | Power/analog ground | Single ground reference for all channels, bias circuits, and interface logic-requires low-impedance PCB plane. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel programmability | Independent 16-bit serial commands allow individual voltage setting, enable/disable, and status readback per channel-enabling software-defined line provisioning. |
| Bypass mode | Full PMOS enhancement bypasses PWM control entirely, delivering VIN directly to LX-critical for peak line driver voltage headroom during transients. |
| Phase-staggered dual-device operation | CBS pin + initialization command enables two TPS54900 devices to operate as synchronized 8-channel unit with 4-cycle PWM offset-reducing input ripple and bulk capacitor requirements. |
| Real-time status monitoring | SDO pin returns 00h only when channel is settled in regulation window; non-zero values indicate transition, OCL fault, or thermal shutdown-enabling deterministic system-level fault recovery. |
| Soft-start with 200-mV stepping | Each channel ramps in 200-mV increments (~87 µs/step at 4.416 MHz SCLK), limiting inrush and preventing false OCL trips during voltage transitions. |
Applications
| ADSL Central Office Line Cards | Software-Defined Line Provisioning |
|---|---|
Use Scenario: Powering multiple THS7102 ADSL line drivers on a single AC5 chipset-based line card in telecom central offices. IC Role / Device Role / Timing Role: Four-channel programmable bias supply managing per-line driver voltage headroom under dynamic load conditions. Use Value: Reduces excess supply headroom by up to 2.5 V per line versus fixed 15 V rails-cutting total card power dissipation and thermal load significantly. |
Use Scenario: Remote reconfiguration of line driver supply voltages via serial bus without hardware changes or power cycling. IC Role / Device Role / Timing Role: Serial-programmable voltage source enabling dynamic line provisioning based on DSLAM traffic profiles or line quality metrics. Use Value: Enables runtime optimization of power vs. performance trade-offs-e.g., lowering voltage during idle periods while maintaining fast wake-up via bypass mode. |
| Multi-Channel Line Ranger Systems | Compact Low-Power Bias Supplies |
Use Scenario: Supporting LineRanger functionality in TNETD5800-based octal datapump systems requiring independent per-channel supply control. IC Role / Device Role / Timing Role: Companion regulator providing regulated, staggered, and monitored bias to eight line drivers across two TPS54900 devices. Use Value: Eliminates need for eight discrete LDOs or switching supplies-reducing BOM count, board area, and layout complexity while maintaining channel isolation. |
Use Scenario: Providing stable, low-noise bias to analog front-end components where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact, integrated buck converter delivering up to 100 mA per channel with internal compensation and no external loop components. Use Value: Achieves >90% efficiency at light loads without external compensation parts-ideal for battery-backed or thermally isolated subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel programmable buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54821RHLR | Single-channel, 20-V input, 3-A sync buck with PMBus interface-not pin-compatible; lacks multi-channel integration or bypass mode. | Used in high-current point-of-load applications-not suitable for ADSL line card per-channel biasing. | Select only if higher current (>100 mA) and digital telemetry (PMBus) outweigh need for channel count and pass-through capability. |
| LM27402SQ/NOPB | Two-channel, 4.5–20 V input, 3-A per channel, no integrated FETs-requires external MOSFETs and compensation; no serial programming or bypass mode. | Targeted at high-power DC/DC modules-not designed for low-current, software-provisioned line driver systems. | Consider only when external FET control, higher current, or different topology (e.g., current-mode) is required-adds significant design overhead. |
Compared with TPS54900PWRG4, both alternatives lack native four-channel integration, serial voltage programming, and VIN-pass-through capability-making them unsuitable as drop-in replacements for ADSL line card bias management, though viable for broader multi-rail power applications.
Availability
TPS54900PWRG4 is available at Aetrix Electronics and suitable for ADSL central office line cards, software-defined line provisioning systems, and LineRanger-enabled datapump designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TPS54900PWRG4 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 focused on analog, embedded processing, and connectivity technologies-with broad portfolio coverage in industrial, automotive, and communications markets.
The TPS54900PWRG4 belongs to TI's legacy ADSL power management product line, engineered specifically to reduce supply headroom and enable software-controlled line provisioning in central office DSLAM systems.
FAQ
What is the maximum input voltage rating for the TPS54900PWRG4?
The TPS54900PWRG4 has an absolute maximum VIN rating of 18 V, but its recommended operating range is 14.25 V to 16 V per SLVS405. Operation above 16 V risks exceeding internal bias limits and may trigger UVLO hysteresis or reduce long-term reliability-TI specifies 16 V as the upper limit for continuous use in production designs.
Does the TPS54900PWRG4 support true pin-to-pin replacement with other TI multi-channel converters?
No, the TPS54900PWRG4 does not have pin-to-pin compatible alternatives within TI's portfolio. Its unique 16-pin TSSOP layout with four LX/FB pairs, CBS, and frame-sync serial interface is specific to this device. Substituting requires PCB redesign-even functionally similar parts like TPS54821RHLR use different pinouts, interfaces, and channel architectures.
How does the TPS54900PWRG4 handle overcurrent events on individual channels?
The TPS54900PWRG4 detects overcurrent per channel with a 250–750 mA trip threshold sampled ~500 ns after switch turn-on. Upon detection, it disables the affected channel for a hiccup time of 170–360 ms (dependent on SCLK frequency), then automatically retries. This behavior remains active even in bypass mode, ensuring consistent protection across all operating states.
Can the TPS54900PWRG4 be used without connecting all four feedback (FB) pins?
Yes-unused channels can be disabled via serial command (bit D3 = 1), leaving their FB pins floating. However, TI recommends tying unused FB pins to GND through a 100-kΩ resistor to prevent noise coupling and ensure predictable startup behavior. Leaving FB pins unconnected may cause erratic regulation or false fault reporting during initialization.
What is the role of the CBS pin in single-device versus dual-device configurations?
In a single-device setup, CBS sets the ADR2 address mapping for serial commands but has no functional impact on regulation. In dual-device 8-channel mode, CBS distinguishes between two TPS54900 ICs-one with CBS < 0.8 V (ADR2 = 0), the other with CBS > 2.0 V (ADR2 = 1)-enabling coordinated phase staggering and unified serial addressing without additional chip-select lines.
TPS54900PWRG4 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
TPS54900PWRG4 FAQ
1.How can I place an order for TPS54900PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54900PWRG4 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 TPS54900PWRG4 reliable?
The price and inventory of TPS54900PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54900PWRG4 is usually 5 days.
3.What payment methods are accepted for TPS54900PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54900PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54900PWRG4?
TPS54900PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54900PWRG4 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 TPS54900PWRG4?
For technical support, including TPS54900PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54900PWRG4 requirements.
6.How does Aetrix verify that TPS54900PWRG4 is sourced from the original manufacturer or authorized distributors?
All TPS54900PWRG4 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 TPS54900PWRG4 meets industry standards.
7.What is the process for return or replacement of TPS54900PWRG4?
All TPS54900PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54900PWRG4, 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 TPS54900PWRG4 part is unused and in its original packaging.
Return procedure for TPS54900PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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