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Texas Instruments LM2853MHX-2.5/NOPB
- Part No.:
- LM2853MHX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-2.5/NOPB.pdf
- Description:
- IC REG BUCK 2.5V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,330
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Product details
Overview
LM2853MHX-2.5/NOPB from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator with factory-programmed 2.5 V output, 40 mΩ high-side and 32 mΩ low-side MOSFETs, voltage-mode control, and internal type-three compensation. It operates from 3 V to 5.5 V input and delivers precise point-of-load power for FPGA core rails.
For engineers reviewing the LM2853MHX-2.5/NOPB datasheet, LM2853MHX-2.5/NOPB pinout, LM2853MHX-2.5/NOPB application, or LM2853MHX-2.5/NOPB equivalent, key selection criteria include its fixed 2.5 V output, HTSSOP-14 thermal performance, soft-start programmability via external capacitor, and compatibility with standard ceramic output capacitors in the 120–220 µF range.
Technical Context
The LM2853MHX-2.5/NOPB implements voltage-mode PWM control with integrated high- and low-side MOSFETs (RDS(ON) = 40 mΩ / 32 mΩ), enabling efficient 3 A continuous operation at 550 kHz switching frequency. Its internal type-three compensation eliminates external compensation components and ensures stability with recommended inductor (4.7–6.8 µH) and output capacitor (120–220 µF, 70–150 mΩ ESR) ranges.
It supports split-rail operation (AVIN ≥ PVIN), features 12 µA shutdown current, 2.47 V UVLO threshold with 50–260 mV hysteresis, and thermal shutdown at 165 °C with 10 °C hysteresis. The device uses dedicated AVIN (control logic supply) and PVIN (power FET supply) inputs, with separate SGND and PGND pins for noise isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2.5% over –40°C to +125°C junction temperature |
| Max Output Current | 3 A continuous load capability without derating at TJ ≤ 125°C |
| Input Voltage Range | 3 V to 5.5 V on PVIN; 3 V to 5.5 V on AVIN (AVIN must be ≥ PVIN) |
| Switching Frequency | 550 kHz nominal; operates from 325 kHz to 725 kHz across temperature and line |
| RDS(ON) (HS/LG) | 40 mΩ (high-side PFET) / 32 mΩ (low-side NFET) at ISW = 3 A and full temperature range |
| Quiescent Current | 0.85–2 mA operating current; 12–50 µA shutdown current with EN = 0 V |
| Soft-Start Control | RC-based timing via external capacitor on SS pin; 450 kΩ internal DAC resistor enables 1–3 ms startup |
Pinout & Package
LM2853MHX-2.5/NOPB is housed in a thermally enhanced 14-pin HTSSOP (PWP) package (5.00 mm × 4.40 mm) with exposed pad internally connected to GND - requires soldering to external ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control circuit supply | Provides regulated bias for internal logic, reference, and error amplifier; must be ≥ PVIN |
| 2 (EN) | Enable input | Active-high enable with internal 1.5 µA pullup; VIH ≥ 75% of AVIN, VIL ≤ 25% of AVIN |
| 3 (SGND) | Analog ground | Low-noise return for AVIN, EN, SS, SNS; must be isolated from PGND except at single-point star ground |
| 4 (SS) | Soft-start node | Connects to external capacitor to set controlled output ramp time; internal 450 kΩ resistor sets RC time constant |
| 5 (NC) | No-connect | Must be tied to SGND; not internally connected |
| 6,7 (PVIN) | Power switch supply | High-current input for internal PFET/NFET; requires low-ESR bulk capacitor placed adjacent to pins |
| 8,9 (SW) | Switch node | Drives external inductor; high dV/dt node requiring short, wide trace and minimal loop area for EMI control |
| 10,11 (PGND) | Power ground | Return path for high-current switching paths (PVIN → SW → PGND); connects to exposed pad |
| 12,13 (NC) | No-connect | Must be tied to PGND; not internally connected |
| 14 (SNS) | Output voltage sense | High-impedance feedback input; connect directly to load for accurate regulation; avoid routing near SW |
| EP (Exposed Pad) | Thermal & ground connection | Internally bonded to PGND; must be soldered to ≥ 200 mm² copper pour for RθJA = 38°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-MOSFET power stage | Eliminates external switches and reduces BOM count; 40 mΩ/32 mΩ RDS(ON) enables >90% efficiency at 3 A |
| Factory-programmed fixed output | 2.5 V option eliminates external feedback resistors and improves accuracy vs. adjustable variants |
| Internal type-three compensation | Removes need for external compensation network; simplifies design while maintaining ≥45° phase margin |
| Split-rail input architecture | Allows independent optimization of control (AVIN) and power (PVIN) supplies for improved noise immunity |
| Low shutdown quiescent current | 12 µA max enables ultra-low-power standby in battery-backed or always-on systems |
Applications
| Industrial PLC I/O Module Power | FPGA Core Rail (2.5 V) |
|---|---|
|
Use Scenario: Powering 2.5 V I/O banks in programmable logic controllers with tight thermal constraints and high reliability requirements. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator delivering stable 2.5 V at up to 3 A from 5 V backplane supply. Use Value: Internal MOSFETs and HTSSOP thermal design sustain full load at 70°C ambient without airflow; soft-start prevents inrush into distributed capacitance. |
Use Scenario: Supplying configurable logic blocks (CLBs) and block RAM in Xilinx Spartan-7 or Intel MAX 10 FPGAs requiring clean, low-noise 2.5 V core voltage. IC Role / Device Role / Timing Role: Point-of-load regulator with dedicated SNS pin routing to FPGA VCCIO pins for tight regulation under dynamic load transients. Use Value: 550 kHz switching enables compact 4.7 µH inductor and 150 µF ceramic output cap; <2 mV/A load regulation maintains voltage within FPGA spec limits. |
| Optical Line Card Bias Supply | Industrial Ethernet PHY Interface |
|
Use Scenario: Generating 2.5 V bias for laser diode drivers and transimpedance amplifiers in telecom line cards operating in NEBS-compliant enclosures. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 3.3 V or 5 V intermediate bus; handles fast load steps from burst-mode optical signaling. Use Value: 12 µA shutdown current extends hold-up time during brownout; thermal shutdown (165°C) protects against fiber-coupled heat buildup. |
Use Scenario: Powering 2.5 V analog front-end and SerDes circuits in industrial Ethernet switches supporting IEEE 802.3bt PoE++. IC Role / Device Role / Timing Role: Local regulator decoupling PHY IC from noisy system rails; SGND/PGND separation minimizes coupling into sensitive receive paths. Use Value: 38°C/W θJA allows operation at full 3 A in 60°C sealed chassis; UVLO hysteresis prevents oscillation during input sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54328DDAR | 3 A, 2.95–6 V input, adjustable output (0.8–4.5 V); no factory-set 2.5 V option; requires external feedback resistors | Requires layout changes for feedback network; lacks integrated soft-start capacitor timing resistor | Select when adjustable output or wider input range is needed; verify loop stability with chosen output cap ESR |
| MP2315DJ-LF-Z | 3 A, 4.5–26 V input, fixed 2.5 V output; higher minimum input (4.5 V) and larger SOIC-8 package (no exposed pad) | Not suitable for 3–3.6 V input systems; thermal resistance ~65°C/W limits 3 A operation without airflow | Choose only for higher-input industrial rails where board space permits larger footprint and thermal derating is acceptable |
Compared with LM2853MHX-2.5/NOPB, TPS54328DDAR offers flexibility at the cost of added components and tuning effort, while MP2315DJ-LF-Z trades input voltage range and thermal performance for simpler procurement - neither matches the LM2853MHX-2.5/NOPB's combination of fixed 2.5 V accuracy, 3 V input support, and HTSSOP thermal efficiency.
Availability
LM2853MHX-2.5/NOPB is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA core power, optical line card bias supplies, and industrial Ethernet PHY interfaces requiring stable component supply with long-term lifecycle assurance.
Supply support for LM2853MHX-2.5/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 power conversion ICs.
The LM2853 product line delivers highly integrated, thermally optimized synchronous buck regulators for space-constrained, high-current point-of-load applications in industrial, communications, and computing systems.
FAQ
What is the output voltage tolerance of the LM2853MHX-2.5/NOPB over temperature?
The LM2853MHX-2.5/NOPB maintains a 2.5 V output with ±2.5% tolerance (2.4437 V to 2.5563 V) across the full operating junction temperature range of –40°C to +125°C, as specified in the Electrical Characteristics table under VOUT for the 2.5 V option.
Does the LM2853MHX-2.5/NOPB require external compensation components?
No, the LM2853MHX-2.5/NOPB integrates a complete type-three compensation network, eliminating the need for external capacitors or resistors in the feedback loop. This simplifies design and ensures stability when used with recommended output filter components (e.g., 4.7–6.8 µH inductor and 120–220 µF output capacitor).
Can the LM2853MHX-2.5/NOPB operate with separate AVIN and PVIN supplies?
Yes, the LM2853MHX-2.5/NOPB supports split-rail operation: AVIN powers the control circuitry (3–5.5 V), while PVIN supplies the power switches (1.5–5.5 V). PVIN must not exceed AVIN, and output filter component selection should be based on the PVIN value used in the design.
What is the recommended soft-start capacitor value for the LM2853MHX-2.5/NOPB?
A 2.2 nF ceramic capacitor on the SS pin yields approximately a 3 ms startup time for the LM2853MHX-2.5/NOPB. The device supports soft-start capacitors from 1 nF to 50 nF; values outside this range may cause fault recovery issues or unstable startup behavior.
How is thermal performance managed in the LM2853MHX-2.5/NOPB package?
The LM2853MHX-2.5/NOPB uses an HTSSOP-14 (PWP) package with an exposed pad internally connected to PGND. For optimal thermal performance, the exposed pad must be soldered to a ≥200 mm² external PCB ground plane, achieving a junction-to-ambient thermal resistance (RθJA) of 38°C/W and enabling full 3 A operation at 70°C ambient without forced airflow.
LM2853MHX-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM2853MHX-2.5/NOPB FAQ
1.How can I place an order for LM2853MHX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-2.5/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 LM2853MHX-2.5/NOPB reliable?
The price and inventory of LM2853MHX-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2853MHX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM2853MHX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-2.5/NOPB?
LM2853MHX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-2.5/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 LM2853MHX-2.5/NOPB?
For technical support, including LM2853MHX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-2.5/NOPB requirements.
6.How does Aetrix verify that LM2853MHX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-2.5/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 LM2853MHX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM2853MHX-2.5/NOPB?
All LM2853MHX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-2.5/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 LM2853MHX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM2853MHX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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