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Texas Instruments LM2854MHX-500/NOPB
- Part No.:
- LM2854MHX-500/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2854MHX-500/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:414
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Product details
Overview
LM2854MHX-500/NOPB from Texas Instruments is a synchronous buck DC-DC regulator IC delivering up to 4 A output current with fixed 500-kHz switching frequency, input voltage range of 2.95 V to 5.5 V, and adjustable output down to 0.8 V. It integrates dual 35-mΩ MOSFETs, supports pre-biased start-up, and targets point-of-load regulation in FPGA/DSP core power supplies.
For engineers reviewing the LM2854MHX-500/NOPB datasheet, LM2854MHX-500/NOPB pinout, LM2854MHX-500/NOPB application, or LM2854MHX-500/NOPB equivalent, key selection criteria include its 500-kHz fixed-frequency operation, HTSSOP-16 exposed-pad thermal performance, soft-start tracking capability, and integrated UVLO/OCP/thermal shutdown protection.
Technical Context
The LM2854MHX-500/NOPB implements voltage-mode PWM control with partial internal compensation, using a 0.8-V reference and external R-C-C network for loop stability. Its architecture includes lossless cycle-by-cycle high-side current limiting (6 A nominal) and negative current detection (–0.4 A) to prevent reverse inductor conduction.
Functional modes include shutdown (EN < 1.08 V), soft-start/track (SS ramping to 0.8 V), and normal regulation. The device features 100% duty-cycle capability, hysteresis on EN (150 mV), and dedicated PVIN/AVIN/AGND/PGND separation to isolate analog bias and power ground paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.95 V to 5.5 V - supports direct regulation from 3.3-V or 5-V system rails without intermediate conversion. |
| Max Output Current | 4 A - sufficient for FPGA core or ASIC I/O supply with margin under thermal derating. |
| Switching Frequency | 500 kHz - balances PCB area (smaller inductors/caps) and efficiency vs 1-MHz variant. |
| RDS(on) (High-Side) | 35 mΩ - reduces conduction loss at full load; enables >90% typical efficiency at 3.3-VIN/1.2-VOUT. |
| Reference Voltage | 0.8 V ±1.25% - sets output accuracy; FB pin connects directly to error amplifier inverting input. |
| Soft-Start Current | 2 µA - linearly charges external capacitor to control output ramp rate and limit inrush. |
| Quiescent Current (Shutdown) | 230 µA - minimizes standby power in battery-backed or always-on systems. |
Pinout & Package
LM2854MHX-500/NOPB uses an HTSSOP-16 package with 4.40 mm × 5.00 mm body size and exposed thermal pad connected to PGND. The package enhances thermal dissipation with RθJA = 38.4°C/W and RθJC(bot) = 1.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC (1, 8, 9) | Reserved | Factory test pins; must be tied to AGND/PGND for stable operation. |
| PGND (2, 3, 4) | Power Ground | Low-impedance return path for high-current switch node; requires local star connection to exposed pad. |
| PVIN (5, 6, 7) | Power Input | High-current input rail connection; multiple pins reduce trace resistance and improve thermal handling. |
| AVIN (10) | Analog Supply | Bias source for internal reference and UVLO; filtered via RC network to reject PVIN ripple. |
| EN (11) | Enable Control | Active-high logic input with 1.23-V threshold and 150-mV hysteresis; enables sequencing and programmable UVLO. |
| SW (12, 13) | Switch Node | Drives external inductor; dual pins reduce parasitic inductance and EMI during 4-A switching transitions. |
| SS (14) | Soft-Start/Track | Sinks 2-µA current to ramp FB reference; supports external resistor divider for output voltage tracking. |
| AGND (15) | Analog Ground | Quiet reference plane for feedback and error amplifier; isolated from PGND except at single-point board tie. |
| FB (16) | Feedback Input | Connects to resistor divider; senses output voltage against 0.8-V internal reference for closed-loop regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased Start-up | Allows safe startup into existing output voltage without sinking current-critical for multi-rail FPGA/ASIC systems. |
| External Soft-Start with Tracking | Enables controlled voltage ramp and synchronization with master supply, preventing sequencing-induced latch-up. |
| Integrated Protection | Combines UVLO (2.95-V rising threshold), overcurrent (6-A peak limit), and thermal shutdown (165°C trip) with hysteresis. |
| 100% Duty Cycle Operation | Maintains regulation even at minimum input-to-output differential, extending usable input range in low-dropout scenarios. |
| Partial Internal Compensation | Reduces external component count while retaining flexibility to optimize loop stability for ceramic or electrolytic output capacitors. |
Applications
| Point-of-Load Regulation for 5-V/3.3-V Rails | FPGA Core Power Supply |
|---|---|
Use Scenario: Regulating 5-V or 3.3-V backplane supply to generate stable 1.2-V or 1.8-V for processor I/O banks. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise DC output with fast transient response. Use Value: Achieves <1% output deviation under 4-A step load due to wide bandwidth voltage-mode control and 500-kHz switching. | Use Scenario: Powering Xilinx or Intel FPGA core logic requiring precise 0.85-V to 1.2-V with strict sequencing relative to auxiliary rails. IC Role / Device Role / Timing Role: Core voltage regulator with pre-biased start-up and SS pin tracking to coordinate with configuration supply. Use Value: Prevents damage from reverse current flow during hot-plug or partial reconfiguration by disabling sink capability until soft-start completes. |
| Portable Computing Power Management | Broadband Networking DSP Supply |
Use Scenario: Delivering 1.05-V/3-A to CPU cores in thin-client or edge-computing modules where thermal headroom is limited. IC Role / Device Role / Timing Role: High-efficiency POL converter leveraging HTSSOP-16 exposed pad for passive cooling without heatsink. Use Value: Maintains <125°C junction temperature at full load with 200 LFM airflow, enabled by RθJC(bot) = 1.3°C/W. | Use Scenario: Supplying 1.5-V/2.5-A to TI C66x or ADI SHARC DSPs in wireless baseband units with stringent ripple requirements. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck regulator using AVIN filtering and separate AGND/PGND to suppress digital noise coupling. Use Value: Limits output voltage ripple to <5 mVPP at 100-kHz bandwidth via optimized compensation and ceramic output capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2854MHX-1000/NOPB | Fixed 1-MHz switching frequency; identical pinout, package, and feature set. | Better suited for space-constrained designs needing smaller magnetics; trades ~2% efficiency for reduced footprint. | Select when PCB area is critical and thermal margin allows higher switching losses. |
| TPS54332DR | 3.5-A max output, 1-MHz fixed frequency, different pinout (SOIC-8), no tracking or pre-bias support. | Limited to lower-current applications; lacks SS pin functionality and robust sequencing features. | Choose only if load current ≤3.5 A and tracking/pre-bias are unnecessary; requires layout redesign. |
Compared with LM2854MHX-500/NOPB, the -1000/NOPB variant offers identical integration and protection but prioritizes compactness over efficiency, while TPS54332DR sacrifices key sequencing capabilities and current rating for cost and package simplicity.
Availability
LM2854MHX-500/NOPB is available at Aetrix Electronics and suitable for FPGA core power, broadband networking infrastructure, and portable computing applications requiring stable component supply across extended production cycles.
Supply support for LM2854MHX-500/NOPB 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 power management technologies, with decades of expertise in high-reliability DC-DC conversion.
The LM2854 product line delivers highly integrated, thermally optimized synchronous buck regulators targeting point-of-load applications in communications, computing, and industrial systems where efficiency, small size, and robust protection are essential.
FAQ
What is the recommended input capacitor for LM2854MHX-500/NOPB?
A 22-µF or 47-µF X7R ceramic capacitor placed adjacent to the PVIN and PGND pins is recommended for LM2854MHX-500/NOPB. This value handles the RMS input current (up to ~2.5 A at 4-A load) and suppresses high-frequency ripple. Additional bulk capacitance may be added for resonance damping, but the primary capacitor must be low-ESR and located within 3 mm of the pins to minimize parasitic inductance.
Does LM2854MHX-500/NOPB support output voltage tracking?
Yes, LM2854MHX-500/NOPB supports output voltage tracking via its SS pin. By connecting a resistor divider from a master supply to the SS pin, the LM2854MHX-500/NOPB output ramps in proportion to the master rail. This ensures precise sequencing in multi-supply systems like FPGAs, avoiding latch-up or data corruption during power-up.
What is the thermal performance of LM2854MHX-500/NOPB in HTSSOP-16 package?
LM2854MHX-500/NOPB in HTSSOP-16 achieves RθJA = 38.4°C/W and RθJC(bot) = 1.3°C/W. With the exposed pad soldered to a 200-mm² copper pour, it sustains 4-A continuous output at ambient temperatures up to 70°C without forced airflow. Thermal shutdown activates at 165°C with 10°C hysteresis, ensuring safe recovery after overload events.
Can LM2854MHX-500/NOPB start up into a pre-biased output?
Yes, LM2854MHX-500/NOPB supports pre-biased start-up. When the output voltage is non-zero at enable, the device does not sink current through the low-side FET during soft-start. Instead, it waits until the SS pin voltage exceeds 0.8 V before engaging regulation-preventing reverse current flow that could damage sensitive loads like ASICs or memory interfaces.
How is the feedback voltage accuracy specified for LM2854MHX-500/NOPB?
LM2854MHX-500/NOPB specifies FB pin voltage as 0.8 V with initial accuracy of ±1.25% over temperature (–40°C to 125°C). This tolerance directly defines output voltage error in adjustable configurations. The device includes error-nulling circuitry to minimize long-term drift and 1/f noise impact, maintaining regulation stability without external calibration.
LM2854MHX-500/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise™, SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.95V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 4A
- Frequency - Switching:
- 525kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM2854MHX-500/NOPB FAQ
1.How can I place an order for LM2854MHX-500/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2854MHX-500/NOPB 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 LM2854MHX-500/NOPB reliable?
The price and inventory of LM2854MHX-500/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2854MHX-500/NOPB is usually 5 days.
3.What payment methods are accepted for LM2854MHX-500/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2854MHX-500/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2854MHX-500/NOPB?
LM2854MHX-500/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2854MHX-500/NOPB 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 LM2854MHX-500/NOPB?
For technical support, including LM2854MHX-500/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2854MHX-500/NOPB requirements.
6.How does Aetrix verify that LM2854MHX-500/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2854MHX-500/NOPB 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 LM2854MHX-500/NOPB meets industry standards.
7.What is the process for return or replacement of LM2854MHX-500/NOPB?
All LM2854MHX-500/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2854MHX-500/NOPB, 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 LM2854MHX-500/NOPB part is unused and in its original packaging.
Return procedure for LM2854MHX-500/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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