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Texas Instruments LM2854MHX-1000/NOPB
- Part No.:
- LM2854MHX-1000/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2854MHX-1000/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
LM2854MHX-1000/NOPB from Texas Instruments is a 4-A, 1-MHz synchronous buck regulator with input voltage range 2.95 V to 5.5 V, adjustable output down to 0.8 V, and integrated 35-mΩ high-side/34-mΩ low-side MOSFETs. It delivers precise POL regulation for FPGA core supplies in portable computing and communications infrastructure.
For engineers reviewing the LM2854MHX-1000/NOPB datasheet, LM2854MHX-1000/NOPB pinout, LM2854MHX-1000/NOPB application, or LM2854MHX-1000/NOPB equivalent, key selection criteria include confirmed 1-MHz switching frequency, pre-biased start-up capability, ±150-mV enable hysteresis, 230-µA shutdown current, and HTSSOP-16 exposed-pad thermal performance.
Technical Context
The LM2854MHX-1000/NOPB implements voltage-mode PWM control with partial internal compensation, supporting ceramic or electrolytic output capacitors via external RCOMP/CCOMP/RFB2 network. Its lossless cycle-by-cycle peak current limit triggers at 6 A nominal and enforces four-cycle pulse skipping during overcurrent events.
Functional modes include shutdown (EN < 1.08 V), soft-start/track (SS ramping to 0.8 V), and normal regulation. Thermal shutdown activates at 165°C with 10°C hysteresis, and UVLO on AVIN ensures safe turn-on only above 2.6 V with 25–375 mV hysteresis.
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 stages. |
| Max Output Current | 4 A - sustains full load under worst-case thermal conditions with proper PCB copper area. |
| Switching Frequency | 1 MHz (±160 kHz) - enables compact 1-µH inductors and reduces solution footprint by ~40% vs 500-kHz variant. |
| RDS(ON) High-Side | 35 mΩ (typ) - limits conduction loss to ≤560 mW at 4 A, critical for >90% efficiency at 1.2-V/4-A output. |
| Reference Voltage | 0.8 V ±1% - sets output accuracy baseline; FB pin tolerance directly determines final VOUT error budget. |
| Soft-Start Current | 2 µA - defines linear VOUT ramp rate; 10 nF CSS yields 4-ms startup, preventing inrush into pre-biased loads. |
| Shutdown Current | 230 µA - minimizes standby power in battery-backed systems; enables rapid wake-up without capacitor recharging delay. |
Pinout & Package
LM2854MHX-1000/NOPB uses a 16-pin HTSSOP package with 4.40 mm × 5.00 mm body size and thermally enhanced exposed pad connected to PGND. The exposed pad must be soldered to a dedicated PCB ground plane for optimal thermal resistance (RθJB = 17.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC (1, 8, 9) | Reserved factory pins | Must be tied to AGND/PGND to ensure stable bias and prevent floating node noise coupling. |
| PGND (2, 3, 4) | Power ground return | Low-impedance path for high di/dt switch currents; requires local star connection to minimize ground bounce. |
| PVIN (5, 6, 7) | Main power input | Connects to input bulk capacitor; multiple pins reduce trace resistance and improve current sharing for 4-A operation. |
| AVIN (10) | Analog supply rail | Provides clean bias for control circuitry; RC filter (1 Ω + 0.1 µF) isolates noise from PVIN to maintain reference stability. |
| EN (11) | Enable control input | Active-high with 1.23 V threshold and 150 mV hysteresis; allows precise sequencing with external resistor divider. |
| SW (12, 13) | Switch node output | Drives external inductor; dual pins reduce parasitic inductance and EMI during 1-MHz transitions. |
| SS (14) | Soft-start/tracking control | 2-µA current source charges external capacitor; also accepts resistor divider for output voltage tracking of master supply. |
| AGND (15) | Analog ground reference | Quiet ground for error amplifier and reference; must be separated from PGND until single-point connection to avoid noise injection. |
| FB (16) | Feedback sensing input | Connects to resistor divider; 0.8-V reference enables accurate VOUT setting from 0.8 V to near VIN with minimal divider error. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased start-up | Enables safe power-up when output is already biased (e.g., FPGA I/O rail); prevents reverse current flow through synchronous rectifier. |
| External soft-start control | Linear VOUT ramp eliminates inrush stress on downstream capacitors and avoids brownout in multi-rail systems. |
| 100% duty cycle capability | Allows dropout operation down to VOUT ≈ VIN – 0.2 V, extending usable input range in low-delta-V applications. |
| Integrated protection | Combines UVLO (2.6 V), overcurrent (6 A peak), and thermal shutdown (165°C) with automatic recovery-no external fault management required. |
| Partial internal compensation | Reduces external components to three (RCOMP, CCOMP, RFB2) while maintaining stability across ceramic/electrolytic output capacitor types. |
Applications
| Point-of-Load Regulation | FPGA Core Supply |
|---|---|
Use Scenario: Regulating 5-V or 3.3-V system rail to 1.2-V or 1.0-V for CPU/FPGA core logic in portable computing devices. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering tightly regulated, low-noise core voltage with fast transient response. Use Value: 4-A capability and 1-MHz switching enable compact layout with minimal output capacitance; pre-biased start-up prevents damage during hot-plug events. | Use Scenario: Powering Xilinx or Intel FPGA core rails requiring strict voltage accuracy (<±1%) and controlled sequencing relative to I/O supplies. IC Role / Device Role / Timing Role: Synchronous buck controller managing core voltage ramp rate and tracking master I/O supply during power-up. Use Value: SS pin tracking function synchronizes core voltage rise with I/O rail; ±1% FB reference ensures compliance with FPGA core voltage tolerance specs. |
| Broadband Networking | ASIC Power Management |
Use Scenario: Providing stable 1.8-V or 2.5-V supply to Ethernet PHYs, SerDes, or packet processors in enterprise switches and routers. IC Role / Device Role / Timing Role: High-efficiency POL regulator operating from mid-rail 3.3-V distribution bus with low EMI profile. Use Value: 35-mΩ MOSFETs and 1-MHz operation minimize heat generation in dense board layouts; integrated thermal shutdown prevents field failures under sustained load. | Use Scenario: Delivering configurable core voltage (0.8–1.5 V) to application-specific ICs in industrial controllers or medical imaging subsystems. IC Role / Device Role / Timing Role: Adjustable buck regulator supporting dynamic voltage scaling and precise enable sequencing in multi-ASIC systems. Use Value: EN pin hysteresis (150 mV) ensures clean power-on reset; 0.8-V reference enables sub-1-V outputs required by advanced ASIC nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3.5-A rating, 1-MHz fixed frequency, 3.5-V to 28-V input range, no pre-biased start-up | Suitable for higher-input industrial rails but lacks pre-bias capability required for FPGA hot-swap | Select when input exceeds 5.5 V or pre-bias is not needed; verify loop stability with external compensation. |
| MP2315GJ-Z | 4-A rating, 1-MHz frequency, 4.5-V to 28-V input, integrated soft-start but no tracking function | Designed for wide-input automotive/industrial use; missing SS pin tracking for multi-rail sequencing | Choose for cost-sensitive non-sequencing applications; confirm thermal derating at 4 A in HTSSOP footprint. |
Compared with TPS54332DR and MP2315GJ-Z, LM2854MHX-1000/NOPB uniquely combines 4-A capability, 1-MHz switching, pre-biased start-up, and SS pin tracking in a 2.95–5.5-V input range-making it optimal for portable and FPGA-centric designs where rail sequencing and hot-plug safety are mandatory.
Availability
LM2854MHX-1000/NOPB is available at Aetrix Electronics and suitable for point-of-load regulation, FPGA core power, broadband networking infrastructure, and portable computing applications requiring stable component supply and long-term production continuity.
Supply support for LM2854MHX-1000/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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.
The LM2854 product line targets high-efficiency, space-constrained DC-DC conversion for portable, networking, and computing applications-emphasizing integration, thermal performance, and robust protection features in small packages.
FAQ
What is the confirmed switching frequency option for LM2854MHX-1000/NOPB?
The LM2854MHX-1000/NOPB is specifically the 1-MHz variant of the LM2854 family, with guaranteed operation between 800 kHz and 1160 kHz across temperature and input voltage. This is distinct from the LM2854MHX-500/NOPB (500-kHz version) and is confirmed by TI's orderable part numbering and datasheet revision SNVS560E Table 6.5.
Does LM2854MHX-1000/NOPB support pre-biased start-up, and how does it behave?
Yes, LM2854MHX-1000/NOPB supports pre-biased start-up: when enabled with an existing output voltage > 0 V, it will not sink current or pull the rail low. Instead, it waits until the SS pin voltage exceeds 0.8 V before engaging regulation-preventing damage to downstream loads connected via parasitic paths, as verified in Section 7.3.5 of the datasheet.
What is the thermal resistance specification for LM2854MHX-1000/NOPB in its HTSSOP-16 package?
LM2854MHX-1000/NOPB has a junction-to-board thermal resistance (RθJB) of 17.1°C/W and junction-to-ambient (RθJA) of 38.4°C/W when mounted on a standard 2-layer JEDEC test board with the exposed pad soldered to a 1-in² copper area, per Section 6.4 of the datasheet.
Can LM2854MHX-1000/NOPB operate with 100% duty cycle, and under what conditions?
Yes, LM2854MHX-1000/NOPB supports 100% duty cycle operation-meaning it can maintain regulation even when VIN drops close to VOUT (e.g., 1.2-V output from 1.4-V input). This occurs when the error amplifier drives the high-side FET fully on, bypassing the PWM comparator, as documented in Section 1 Features and Section 7.3.9.
What external components are required for basic LM2854MHX-1000/NOPB operation beyond input/output capacitors and inductor?
Minimum external components for LM2854MHX-1000/NOPB include: (1) feedback resistors (RFB1/RFB2) to set VOUT, (2) soft-start capacitor (CSS), (3) compensation network (RCOMP, CCOMP, RFB2), and (4) AVIN RC filter (1 Ω + 0.1 µF). These are mandatory per Sections 8.2.2.1–8.2.2.3 and Figure 15.
LM2854MHX-1000/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:
- 1.05MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM2854MHX-1000/NOPB FAQ
1.How can I place an order for LM2854MHX-1000/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2854MHX-1000/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-1000/NOPB reliable?
The price and inventory of LM2854MHX-1000/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-1000/NOPB is usually 5 days.
3.What payment methods are accepted for LM2854MHX-1000/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2854MHX-1000/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2854MHX-1000/NOPB?
LM2854MHX-1000/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2854MHX-1000/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-1000/NOPB?
For technical support, including LM2854MHX-1000/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2854MHX-1000/NOPB requirements.
6.How does Aetrix verify that LM2854MHX-1000/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2854MHX-1000/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-1000/NOPB meets industry standards.
7.What is the process for return or replacement of LM2854MHX-1000/NOPB?
All LM2854MHX-1000/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2854MHX-1000/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-1000/NOPB part is unused and in its original packaging.
Return procedure for LM2854MHX-1000/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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