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Texas Instruments LM2853MHX-3.3
- Part No.:
- LM2853MHX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-3.3.pdf
- Description:
- IC REG BUCK 3.3V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
LM2853MHX-3.3 from Texas Instruments is a 3A, 550 kHz synchronous buck regulator in an exposed-pad HTSSOP-14 package, delivering a factory-programmed 3.3V output from 3.0–5.5V input. It integrates internal 40 mΩ PFET and 32 mΩ NFET switches, type-three compensation, and supports point-of-load regulation for FPGA/DSP core supplies with ±0.743% output voltage tolerance at 3.3V.
For engineers reviewing the LM2853MHX-3.3 datasheet, LM2853MHX-3.3 pinout, LM2853MHX-3.3 application, or LM2853MHX-3.3 equivalent, this page provides verified specifications, thermal-aware package details, soft-start configuration guidance, and validated alternative options for industrial and communications power designs.
Technical Context
The LM2853MHX-3.3 uses voltage-mode control with internal type-three compensation, eliminating external compensation components. Its 550 kHz fixed switching frequency enables compact filter design while maintaining >90% efficiency at 3A load (VIN = 5V, VOUT = 3.3V).
It features dual-input architecture: AVIN (3.0–5.5V) powers control circuitry, while PVIN (1.5–5.5V) supplies power FETs. Thermal shutdown activates at 165°C with 10°C hysteresis, and the exposed pad must be soldered to a ground plane for junction-to-ambient θJA = 38°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 3.3V ±0.743% (3.2257V to 3.3743V), no external feedback required |
| Max Output Current | 3A continuous; peak current limit threshold is 3.6–5A, preventing overcurrent damage |
| Input Voltage Range | AVIN: 3.0–5.5V (control logic); PVIN: 1.5–5.5V (power stage); split-rail operation supported |
| Switching Frequency | 550 kHz (typical), with ±39% variation (325–725 kHz) across temperature and supply |
| FET On Resistance | PFET RDS(ON): 40–120 mΩ; NFET RDS(ON): 32–100 mΩ at 3A - directly impacts conduction loss and thermal rise |
| Soft-Start Time | Configurable via external CSS capacitor (1–50 nF); 2.2 nF yields ~3 ms startup to 95% of final output |
| Quiescent Current | 12 µA in shutdown (EN = 0V); 0.85–2 mA operating current - critical for battery-backed systems |
Pinout & Package
Package: HTSSOP-14 with exposed thermal pad (TI package drawing PWP, JEDEC MO-153 variant MXA14A). The exposed pad is internally connected to GND and must be soldered to an external ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control circuit supply input | Powers internal bias, reference, and error amplifier; must be ≥3.0V and ≤5.5V |
| 2 (EN) | Enable control input | Internally pulled up; drives high (>75% AVIN) to enable, low (<25% AVIN) to disable |
| 3 (SGND) | Low-noise analog ground | Reference ground for feedback and control circuitry; separate from PGND to minimize noise coupling |
| 4 (SS) | Soft-start voltage node | Charged by internal DAC; external capacitor sets startup ramp rate and fault recovery behavior |
| 5,12,13 (NC) | No-connect terminals | Must be tied to SGND or PGND per layout guidelines; not floating |
| 6,7 (PVIN) | Power switch supply input | Supplies high-current PFET/NFET; requires low-impedance path to bulk input capacitor |
| 8,9 (SW) | Switch node | Connects to output inductor; carries high di/dt; requires short, wide trace to minimize EMI and losses |
| 10,11 (PGND) | Power ground return | High-current return path for PFET/NFET; must tie to SGND at single point near IC |
| 14 (SNS) | Output voltage sense input | Monitors regulated output via internal 200 kΩ divider; connect directly to load for accurate remote sensing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity while ensuring stability with recommended LO/CO ranges |
| Internal 40 mΩ PFET + 32 mΩ NFET | Reduces conduction loss and thermal stress; enables 3A operation without external MOSFETs or drivers |
| Split-Rail Input Architecture | Allows independent AVIN (control) and PVIN (power) supplies - e.g., 3.3V AVIN + 5V PVIN - improving efficiency in multi-rail systems |
| Thermal Shutdown with Hysteresis | Shuts down at 165°C and restarts at 155°C, preventing thermal runaway during overload or poor heatsinking |
| Low Shutdown Quiescent Current | 12 µA max shutdown current enables use in always-on, energy-sensitive applications like IoT edge nodes |
Applications
| Point-of-Load Regulation | FPGA Core Power |
|---|---|
|
Use Scenario: Local DC-DC conversion adjacent to high-current digital loads on dense PCBs with tight space constraints. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V at up to 3A with fast transient response. Use Value: Minimizes IR drop and noise coupling via short power paths; exposed pad improves thermal dissipation under sustained load. |
Use Scenario: Powering I/O banks or auxiliary rails in Xilinx or Intel FPGA designs requiring precise 3.3V compliance. IC Role / Device Role / Timing Role: Secondary rail generator supporting configuration, transceivers, or memory interfaces. Use Value: Factory-set 3.3V eliminates feedback resistor errors; soft-start prevents inrush-induced supply sag during FPGA configuration. |
| Broadband Communications | Industrial Embedded Control |
|
Use Scenario: Powering PHYs, SerDes, or packet processors in Ethernet switches, routers, or baseband units. IC Role / Device Role / Timing Role: Mid-power supply for signal integrity-critical analog and mixed-signal blocks. Use Value: 550 kHz switching avoids sensitive IF bands; low EMI layout support ensures EMC compliance in dense RF environments. |
Use Scenario: Reliable 3.3V rail generation in programmable logic controllers (PLCs), HMIs, or motor drive control modules. IC Role / Device Role / Timing Role: Main system rail for microcontrollers, ADCs, and isolated interface ICs operating across −40°C to +125°C. Use Value: Guaranteed operation over full industrial temperature range; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3A, 1 MHz sync buck; adjustable output (0.8–6V); requires external feedback resistors | Higher frequency allows smaller magnetics but increases switching loss at 3.3V/3A | Choose when adjustable output or higher switching frequency is needed; not pin-compatible |
| LMZ12003TZX-3.3 | 3A integrated power module in 12-pin TO-PMOD; includes inductor; 4.5–20V input | Wider input range and built-in magnetics simplify design but increase footprint and cost | Choose for rapid prototyping or space-constrained layouts where board area > BOM cost priority |
Compared with TPS54332DR and LMZ12003TZX-3.3, the LM2853MHX-3.3 offers factory-trimmed 3.3V output with zero external feedback components, lower quiescent current in shutdown, and optimized thermal performance in HTSSOP-14 - making it ideal for cost-sensitive, thermally constrained fixed-output applications.
Availability
LM2853MHX-3.3 is available at Aetrix Electronics and suitable for broadband infrastructure, industrial PLCs, and FPGA-based embedded systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2853MHX-3.3 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 ICs.
The LM2853MHX-3.3 belongs to TI's SIMPLE SWITCHER® synchronous buck regulator family, designed for high-efficiency, low-component-count DC-DC conversion in space- and thermal-constrained applications.
FAQ
What is the output voltage tolerance of the LM2853MHX-3.3?
The LM2853MHX-3.3 has a guaranteed output voltage tolerance of ±0.743% (3.2257V to 3.3743V) over temperature and line conditions. This specification is measured at the SNS pin in non-switching, closed-loop configuration and reflects factory EEPROM programming accuracy - no external resistors affect this value.
Can the LM2853MHX-3.3 operate with different input voltages for control and power stages?
Yes, the LM2853MHX-3.3 supports split-rail operation: AVIN (3.0–5.5V) powers the control logic, while PVIN (1.5–5.5V) supplies the power FETs. PVIN must be ≤ AVIN. This allows optimization - e.g., 3.3V AVIN for low-control-loss and 5V PVIN for higher efficiency at 3.3V output.
What is the recommended soft-start capacitor value for the LM2853MHX-3.3?
A 2.2 nF ceramic capacitor on the SS pin yields ~3 ms startup time to 95% of final output. The LM2853MHX-3.3 restricts CSS to 1–50 nF to ensure controlled start-up and graceful fault recovery; values outside this range may cause instability or improper short-circuit restart behavior.
How does the exposed thermal pad on the LM2853MHX-3.3 affect thermal performance?
The exposed pad on the LM2853MHX-3.3 is internally connected to GND and must be soldered to a dedicated PCB ground plane. Proper soldering reduces junction-to-ambient thermal resistance to 38°C/W (θJA), enabling full 3A operation at +125°C ambient - omitting this step degrades thermal performance by >40%.
Does the LM2853MHX-3.3 require external compensation components?
No, the LM2853MHX-3.3 integrates a complete type-three compensation network. This eliminates external capacitors and resistors, simplifying design and improving reliability. Stability is ensured only when using inductors (4.7–6.8 µH) and output capacitors (120–220 µF, 70–150 mΩ ESR) within the ranges specified in Table 1 of the datasheet.
LM2853MHX-3.3 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2853MHX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-3.3 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 reliable?
The price and inventory of LM2853MHX-3.3 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 is usually 5 days.
3.What payment methods are accepted for LM2853MHX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-3.3?
LM2853MHX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-3.3 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?
For technical support, including LM2853MHX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-3.3 requirements.
6.How does Aetrix verify that LM2853MHX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-3.3 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 meets industry standards.
7.What is the process for return or replacement of LM2853MHX-3.3?
All LM2853MHX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-3.3, 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 part is unused and in its original packaging.
Return procedure for LM2853MHX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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