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Texas Instruments LM2853MHX-3.3/NOPB
- Part No.:
- LM2853MHX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,537
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Product details
Overview
LM2853MHX-3.3/NOPB from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator with factory-programmed 3.3 V output, 3 V to 5.5 V input range, internal 40 mΩ/32 mΩ MOSFETs, and voltage-mode control-designed for FPGA core power in telecom infrastructure.
For engineers reviewing the LM2853MHX-3.3/NOPB datasheet, LM2853MHX-3.3/NOPB pinout, LM2853MHX-3.3/NOPB application, or LM2853MHX-3.3/NOPB equivalent, key selection criteria include output voltage accuracy (±0.6% at TJ = –40°C to 125°C), thermal performance (RθJA = 38°C/W), soft-start programmability via external capacitor, and HTSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The LM2853MHX-3.3/NOPB implements voltage-mode PWM control with integrated type-three compensation, eliminating external compensation components. Its dual-rail capability allows independent AVIN (3–5.5 V) and PVIN (1.5–5.5 V) supplies, enabling optimized logic and power stage biasing.
Internal protection includes thermal shutdown (165°C, 10°C hysteresis), current-limit threshold (3.6–5 A), and UVLO on AVIN (2.47–3.0 V rising edge). The device achieves up to 94% efficiency at 3 A load with 5 V input and 3.3 V output, per Figure 5 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 3.3 V ±0.6% over –40°C to 125°C - ensures stable core rail for FPGA I/O banks without external feedback resistors. |
| Max Output Current | 3 A continuous - supports mid-range FPGA or DSP core loads without derating at 25°C ambient. |
| Switching Frequency | 550 kHz (325–725 kHz range) - enables compact 4.7–6.8 µH inductors and reduces EMI compared to 2.2 MHz alternatives. |
| Input Voltage Range | 3 V to 5.5 V on AVIN; 1.5 V to 5.5 V on PVIN - supports split-rail operation for improved efficiency in mixed-voltage systems. |
| RDS(ON) | 40 mΩ (PFET) / 32 mΩ (NFET) - minimizes conduction loss at full load, contributing to >90% efficiency at 2 A. |
| Quiescent Current | 12 µA in shutdown - enables low-power standby modes in always-on networking equipment. |
| Soft-Start Control | External capacitor (1–50 nF) on SS pin - provides adjustable startup time (e.g., 3 ms with 2.2 nF) to prevent inrush current faults. |
Pinout & Package
LM2853MHX-3.3/NOPB uses a 14-pin HTSSOP (PWP) package (5.00 mm × 4.40 mm) with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control circuit supply | Bias voltage for internal logic and error amplifier; must be ≥3 V for guaranteed operation. |
| 2 (EN) | Enable input | Active-high enable with internal 1.5 µA pullup; drives high to activate regulator, low to enter 12 µA shutdown. |
| 3 (SGND) | Signal ground | Low-noise reference for feedback and control circuits; separate from PGND to minimize noise coupling. |
| 4 (SS) | Soft-start node | Connects to external capacitor to control output ramp rate; also used by fault recovery circuitry during short-circuit events. |
| 5, 12, 13 (NC) | No-connect | Must be tied to ground per datasheet; not internally connected but required for thermal and mechanical stability. |
| 6, 7 (PVIN) | Power FET supply | High-current input for internal MOSFETs; accepts lower voltage than AVIN (down to 1.5 V) in split-rail configurations. |
| 8, 9 (SW) | Switch node | Drives external inductor; exhibits fast dV/dt transitions requiring short, wide trace routing to minimize EMI. |
| 10, 11 (PGND) | Power ground | Return path for high-switching currents; must be joined to SGND at single point near IC for optimal noise isolation. |
| 14 (SNS) | Voltage sense input | Monitors regulated output via 200 kΩ resistor divider; requires Kelvin connection near load for <1% regulation error. |
| EP (Exposed Pad) | Thermal & ground connection | Internally connected to GND but not primary return path; must be soldered to large PCB ground plane for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity while maintaining >45° phase margin across recommended LO/CO ranges. |
| Factory-Programmed Output | Fixed 3.3 V output set at wafer level - removes need for external feedback resistors and avoids trimming errors in production. |
| Split-Rail Input Architecture | Independent AVIN and PVIN supplies - allows use of lower-voltage PVIN (e.g., 3.3 V) to reduce switching losses while maintaining 5 V AVIN for robust control logic. |
| Thermal Shutdown with Hysteresis | 165°C trip with 10°C hysteresis - prevents thermal runaway during overload while enabling automatic recovery after cooling. |
| Low-Noise Signal Ground (SGND) | Dedicated ground pin isolated from power return - preserves ADC reference integrity and analog subsystem accuracy in mixed-signal designs. |
Applications
| Telecom Point-of-Load Regulation | FPGA Core Power Supply |
|---|---|
|
Use Scenario: Regulating 3.3 V from 5 V backplane in Ethernet switch line cards with space-constrained 4-layer PCBs. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering clean, tightly regulated 3.3 V to PHY transceivers and management controllers. Use Value: Achieves 93% efficiency at 2.5 A load and maintains ±0.6% output accuracy across temperature, reducing thermal design margin. |
Use Scenario: Powering Xilinx Spartan-7 FPGA core rails in industrial gateway devices operating at –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Synchronous buck regulator supplying 3.3 V I/O bank with fast transient response to logic switching events. Use Value: Internal soft-start (configurable via 2.2 nF CSS) prevents inrush current tripping upstream fuses during cold start. |
| Broadband Access Equipment | Industrial PLC Communication Modules |
|
Use Scenario: Generating 3.3 V for GPON ONU optical module control circuitry where EMI must meet CISPR-22 Class B limits. IC Role / Device Role / Timing Role: High-frequency (550 kHz) buck converter minimizing filter component size while meeting conducted emission requirements. Use Value: Exposed-pad HTSSOP package enables direct thermal coupling to inner ground plane, lowering junction temperature by ~15°C vs. SOIC. |
Use Scenario: Providing isolated 3.3 V rail for RS-485 transceivers and microcontroller peripherals in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Robust power stage with UVLO (2.47 V) and thermal shutdown protecting against brownout and enclosure overheating. Use Value: Dual-rail operation allows 3.3 V PVIN + 5 V AVIN configuration, cutting conduction loss by 22% versus single-rail 5 V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54331DR | 3 A, 28 V max input, adjustable output (0.8–28 V) via external resistors; no factory-programmed fixed options. | Requires external feedback network and compensation - increases BOM count and design validation effort. | Select when output voltage flexibility or higher input voltage (>5.5 V) is required; not drop-in for LM2853MHX-3.3/NOPB. |
| MP2333HG-33-P | 3 A, 5.5 V max input, fixed 3.3 V output; 1.2 MHz switching frequency; smaller QFN-10 package (3 mm × 3 mm). | Higher frequency enables smaller magnetics but increases switching loss and EMI filtering complexity. | Select when board area is critical and thermal budget allows higher RθJA (65°C/W); not pin-compatible with HTSSOP-14 footprint. |
Compared with TPS54331DR and MP2333HG-33-P, LM2853MHX-3.3/NOPB offers lowest system-level design effort for fixed 3.3 V applications due to zero-resistor configuration, integrated compensation, and proven thermal performance in HTSSOP-14 - making it optimal for cost-sensitive, high-volume telecom and industrial designs.
Availability
LM2853MHX-3.3/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA power delivery, and industrial PLC applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2853MHX-3.3/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2853 product line delivers highly integrated synchronous buck regulators targeting space-constrained, thermally demanding point-of-load applications in networking, computing, and industrial automation.
FAQ
What is the output voltage tolerance of LM2853MHX-3.3/NOPB over temperature?
The LM2853MHX-3.3/NOPB guarantees output voltage within ±0.6% (3.2257 V to 3.3743 V) across the full operating junction temperature range of –40°C to 125°C, as specified in Section 6.5 of the datasheet under "VOUT = 3.3 V option" test conditions.
Does LM2853MHX-3.3/NOPB require external compensation components?
No, LM2853MHX-3.3/NOPB integrates a complete type-three compensation network on-die. This eliminates external capacitors and resistors typically needed for loop stability, simplifying design and improving consistency across production units.
Can LM2853MHX-3.3/NOPB operate with different voltages on AVIN and PVIN pins?
Yes, LM2853MHX-3.3/NOPB supports split-rail operation: AVIN may be set to 5 V for robust control logic while PVIN is supplied at 3.3 V to reduce conduction losses in the internal MOSFETs - provided PVIN ≤ AVIN and both remain within their respective absolute maximum ratings.
What is the recommended soft-start capacitor value for LM2853MHX-3.3/NOPB?
A 2.2 nF ceramic capacitor on the SS pin yields approximately 3 ms startup time, as calculated using the internal 450 kΩ DAC resistor (RC = 1 ms × 3 time constants). Values between 1 nF and 50 nF are supported, with 2.2 nF being the reference design value shown in Table 4.
How does the exposed thermal pad on LM2853MHX-3.3/NOPB improve performance?
The exposed pad on LM2853MHX-3.3/NOPB must be soldered to a PCB ground plane to achieve the rated RθJA of 38°C/W. Lab measurements confirm this improves both thermal performance (reducing junction temperature rise by ~15°C at 3 A) and regulation accuracy by stabilizing internal reference behavior.
LM2853MHX-3.3/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):
- 3.3V
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2853MHX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2853MHX-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2853MHX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-3.3/NOPB?
LM2853MHX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-3.3/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-3.3/NOPB?
For technical support, including LM2853MHX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2853MHX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2853MHX-3.3/NOPB?
All LM2853MHX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2853MHX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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