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Texas Instruments TPS54900PWG4
- Part No.:
- TPS54900PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS54900PWG4.pdf
- Description:
- IC REG BCK PROG 100MA QD 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,336
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Product details
Overview
TPS54900PWG4 from Texas Instruments is a quad-channel, voltage-mode PWM step-down converter IC with integrated high-side PMOSFET switches (rDS(on) = 0.8 Ω typ), programmable 7.5 V–13.1 V output in 400-mV steps via 4-wire serial interface, and pass-through mode for VIN routing to any output-designed for ADSL central office line driver power management.
For engineers reviewing the TPS54900PWG4 datasheet, TPS54900PWG4 pinout, TPS54900PWG4 application, or TPS54900PWG4 equivalent, key selection considerations include per-channel programmability, synchronous PWM operation at 552 kHz, global/individual channel enable/disable, thermal shutdown at 150°C, and compatibility with THS7102 line drivers in AC5 chipset systems.
Technical Context
The TPS54900PWG4 implements four independent voltage-mode PWM controllers, each with an internal bandgap reference, DAC-based setpoint generation, and dedicated feedback (FB0–FB3) for closed-loop regulation. Its serial command interface supports 16-bit read/write operations with frame sync (SFS), clock (SCLK), data in (SDI), and open-drain status out (SDO).
Each channel integrates a high-side PMOSFET switch and supports soft-start ramping in 200-mV increments (≤4 ms transition between 7.5 V and 13.1 V). Phase stagger initialization enables coordinated operation of dual devices for 8-channel configurations, while UVLO (13.5 V threshold, 1.45 V hysteresis) ensures controlled startup and fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | Four independent regulated outputs (LX0–LX3), each programmable 7.5 V–13.1 V in 0.4-V steps or bypass mode |
| Max output current per channel | 100 mA continuous - sufficient for low-power ADSL line driver bias rails |
| PMOS rDS(on) | 0.8 Ω typical - enables high efficiency in low-current, high-voltage-drop applications |
| Synchronized PWM frequency | 552 kHz (SCLK/8) - reduces EMI and allows input capacitor optimization |
| Overcurrent protection | 250–750 mA trip threshold with 170–360 ms hiccup time - protects against shorted loads without latch-off |
| Thermal shutdown | 150°C trip point with 10°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking |
| Operating ambient range | −40°C to +85°C - validated for central office telecom environments |
Pinout & Package
TSSOP-16 (PW) package, 5.0 mm × 4.4 mm, 0.65 mm pitch, RoHS-compliant (Pb-Free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX0–LX3 | Channel switch node outputs | Connect to inductor and catch diode; each drives one regulated output rail |
| GND | Power and analog ground | Common return for all channels, control circuitry, and feedback paths |
| VIN | Main supply input | 14.25–16 V input; powers internal bias and all high-side FETs |
| EN | Global enable input | Logic-high (>2.0 V) enables all channels; pull >VIN − 0.5 V forces bypass mode |
| CBS | Channel bank select | Determines ADR2 mapping for multi-device 8-channel addressing (low = ADR2=0, high = ADR2=1) |
| SFS, SCLK, SDI, SDO | 4-wire serial interface | Frame-sync, clock, data-in (16-bit), and open-drain status-out for programming and monitoring |
| FB0–FB3 | Per-channel feedback inputs | Resistive divider inputs for closed-loop regulation; each tied to respective LX output filter |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel voltage programming | 15-step resolution (7.5–13.1 V @ 0.4 V/step) enables precise headroom tuning per line driver |
| Pass-through (bypass) mode | Direct VIN routing to any output eliminates switching loss and maximizes peak voltage for high-dynamic-range line transmission |
| Global and per-channel status reporting | Non-zero SDO byte indicates transition, overcurrent, or thermal fault - enables real-time system diagnostics |
| External PWM synchronization | Accepts 4.416 MHz SCLK to lock all channels to system clock - critical for EMI reduction in dense line cards |
| Phase-stagger initialization | Hardware-assisted 4-cycle offset between dual TPS54900 devices reduces input ripple and bulk capacitor requirements |
Applications
| ADSL Central Office Line Cards | Software-Provisioned Line Driver Power |
|---|---|
Use Scenario: Powering multiple THS7102 ADSL line drivers on a single AC5 chipset-based line card in a central office DSLAM. IC Role / Device Role / Timing Role: Quad-channel programmable supply delivering individually optimized voltages to line driver bias rails under AC5 host control. Use Value: Reduces excess supply headroom per line, cutting total power consumption by up to 30% versus fixed-rail solutions. |
Use Scenario: Dynamic reconfiguration of line driver supply voltages during service provisioning or fault recovery without hardware changes. IC Role / Device Role / Timing Role: Serial-programmable regulator enabling remote voltage adjustment via host microcontroller over 4-wire interface. Use Value: Eliminates need for discrete DACs, op-amps, and external regulators-reducing BOM count and board area by >40%. |
| Multi-Channel Telecom Power Management | LineRanger-Enabled Power Control |
Use Scenario: Coordinating eight regulated supplies across two TPS54900PWG4 devices on an 8-port line card using phase-staggered PWM. IC Role / Device Role / Timing Role: Synchronized quad-channel buck controller supporting CBS-based device addressing and initialization handshake. Use Value: Lowers input RMS current and eases input capacitor selection-cutting 12 V rail ripple by ≥50% vs unsynchronized operation. |
Use Scenario: Enabling/disabling individual line driver supplies during low-activity periods (e.g., idle lines) to minimize quiescent power. IC Role / Device Role / Timing Role: Programmable regulator with per-channel disable (D3 bit) and fast 4-ms voltage transitions for rapid wake-up. Use Value: Achieves <100 µA per-channel shutdown current, extending system energy efficiency during standby modes. |
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-A synchronous buck; no serial interface or multi-rail programmability | Designed for high-current processor core rails-not for multi-output telecom biasing | Select only if consolidating into a single high-current rail with external sequencing logic |
| LM27402MHX/NOPB | Single-channel, 3–28 V input, no integrated FETs, requires external MOSFETs and compensation | Targeted at flexible industrial DC/DC designs-not pre-validated for ADSL line driver timing or thermal profiles | Choose only when full external component control and wide VIN range outweigh integration and telecom qualification needs |
Compared with TPS54900PWG4, TPS54821RHLR lacks per-channel programmability and serial control, while LM27402MHX/NOPB requires external power stage design and offers no built-in fault reporting-making neither suitable as direct functional replacements in AC5-based line card deployments.
Availability
TPS54900PWG4 is available at Aetrix Electronics and suitable for ADSL central office equipment, telecom line card power management, and software-provisioned line driver applications requiring stable component supply and legacy design continuity.
Supply support for TPS54900PWG4 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 deep expertise in power management ICs for communications infrastructure.
The TPS54900PWG4 belongs to TI's telecom-specific power management portfolio, engineered to deliver tightly regulated, software-configurable bias supplies for ADSL line drivers in carrier-grade central office systems.
FAQ
What is the primary function of the TPS54900PWG4 in ADSL systems?
The TPS54900PWG4 serves as a quad-channel programmable step-down converter that delivers individually adjustable bias voltages (7.5 V–13.1 V) to THS7102 ADSL line drivers on AC5 chipset-based line cards. Its serial interface enables dynamic voltage provisioning under host control, reducing excess supply headroom and improving overall system power efficiency in central office DSLAMs.
Does the TPS54900PWG4 support synchronization with an external clock?
Yes, the TPS54900PWG4 accepts an external 4.416 MHz SCLK signal to synchronize its internal PWM clocks at 552 kHz (SCLK/8). This synchronization reduces conducted EMI and enables coherent ripple cancellation when multiple devices operate on shared input rails-critical for high-density line card layouts.
How does the bypass (pass-through) mode work on the TPS54900PWG4?
The TPS54900PWG4 enters bypass mode when commanded via serial interface (voltage code "F") or when EN is pulled above VIN − 0.5 V. In this mode, the high-side PMOSFET is fully enhanced, disabling switching circuitry and routing VIN directly to the selected LX output-preserving maximum voltage headroom for high-peak line transmission without conversion loss.
What thermal protection features does the TPS54900PWG4 include?
The TPS54900PWG4 incorporates junction-level thermal shutdown at 150°C with 10°C hysteresis. When triggered, it disables all switching circuitry and resets soft-start logic. Upon cooling below 140°C, the device automatically restarts and resumes regulation at previously programmed voltage levels-ensuring robust operation in unventilated central office enclosures.
Can two TPS54900PWG4 devices be used together for eight-channel operation?
Yes-two TPS54900PWG4 devices can be configured as an 8-channel unit using the CBS (channel bank select) pin and serial address bit ADR2. An initialization command staggers their PWM ramps by four SCLK cycles, reducing input ripple and easing bulk capacitor requirements. Both devices retain independent voltage programming and status reporting via shared SCLK/SFS/SDI/SDO lines.
TPS54900PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
TPS54900PWG4 FAQ
1.How can I place an order for TPS54900PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54900PWG4 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 TPS54900PWG4 reliable?
The price and inventory of TPS54900PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54900PWG4 is usually 5 days.
3.What payment methods are accepted for TPS54900PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54900PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54900PWG4?
TPS54900PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54900PWG4 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 TPS54900PWG4?
For technical support, including TPS54900PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54900PWG4 requirements.
6.How does Aetrix verify that TPS54900PWG4 is sourced from the original manufacturer or authorized distributors?
All TPS54900PWG4 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 TPS54900PWG4 meets industry standards.
7.What is the process for return or replacement of TPS54900PWG4?
All TPS54900PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54900PWG4, 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 TPS54900PWG4 part is unused and in its original packaging.
Return procedure for TPS54900PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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