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Texas Instruments LM2853MH-3.3
- Part No.:
- LM2853MH-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MH-3.3.pdf
- Description:
- IC REG BUCK 3.3V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
LM2853MH-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/32 mΩ MOSFETs, type-three compensation, and soft-start control-enabling compact, low-component-count point-of-load regulation for FPGA core supplies.
For engineers reviewing the LM2853MH-3.3 datasheet, LM2853MH-3.3 pinout, LM2853MH-3.3 application, or LM2853MH-3.3 equivalent, key selection criteria include its fixed 3.3V output, 12 µA shutdown current, thermal shutdown at 165°C, and compatibility with standard 4.7–6.8 µH inductors and 120–220 µF output capacitors per TI's recommended design guidelines.
Technical Context
The LM2853MH-3.3 employs voltage-mode PWM control with internal type-three compensation, eliminating external compensation components. Its dual-rail architecture separates AVIN (3.0–5.5V control supply) from PVIN (1.5–5.5V power supply), enabling optimized noise isolation and flexible input sourcing.
It features integrated high-side and low-side MOSFETs (RDS(ON) = 40 mΩ / 32 mΩ), programmable soft-start via external capacitor (1–50 nF), and fault-responsive soft-start voltage clamping during UVLO or short-circuit events-ensuring controlled restart without output overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.1% over −40°C to +125°C junction temperature |
| Max Output Current | 3A continuous load capability with thermal foldback protection above 165°C |
| Input Voltage Range | 3.0V to 5.5V on AVIN; 1.5V to 5.5V on PVIN-supports split-rail operation |
| Switching Frequency | 550 kHz nominal (325–725 kHz range), enabling compact magnetics and predictable EMI profile |
| Quiescent Current | 12 µA in shutdown mode; 0.85–2 mA operating current reduces no-load power loss |
| Thermal Resistance | θJA = 38°C/W (MXA14A package), requiring minimal PCB copper area for full 3A operation at +85°C ambient |
| Enable Threshold | VIH = 75% of AVIN; VIL = 25% of AVIN-compatible with standard logic-level enable signals |
Pinout & Package
LM2853MH-3.3 uses the HTSSOP-14 (PWP) package with exposed thermal pad (EP), rated for 260°C soldering and JEDEC Level-1 moisture sensitivity. The exposed pad must be soldered to a dedicated ground plane for thermal and electrical performance-EP is internally connected to GND but not rated as primary GND path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control circuit supply input | Provides regulated bias for internal logic; must be ≥3.0V and ≤5.5V; decoupled locally with 1 µF ceramic |
| 2 (EN) | Enable control input | Active-high; internally pulled up-driving low disables regulator and reduces IQ to 12 µA |
| 3 (SGND) | Analog ground reference | Low-noise return for error amplifier and feedback network; separate from PGND to minimize switching noise coupling |
| 4 (SS) | Soft-start timing node | Connects to external capacitor (1–50 nF) to control output ramp rate; also used for fault recovery tracking |
| 5 (NC) | No-connect terminal | Must be tied to SGND; not internally bonded-prevents floating node noise injection |
| 6,7 (PVIN) | Power switch supply input | High-current input for internal FETs; requires low-ESR bulk capacitor placed adjacent to pins |
| 8,9 (SW) | Power switch node | Drives external inductor; high dV/dt node-requires short, wide trace and careful EMI layout |
| 10,11 (PGND) | Power ground return | High-current return path for FETs and inductor; must connect to solid ground plane under EP |
| 12,13 (NC) | No-connect terminals | Both must be tied to PGND; unused bond pads-grounding prevents parasitic coupling |
| 14 (SNS) | Output voltage sense input | High-impedance feedback node; connects directly to load for accurate remote sensing |
| EP | Exposed thermal pad | Internally connected to GND; requires ≥80% solder coverage to PCB ground plane for thermal compliance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | Co-packaged 40 mΩ high-side and 32 mΩ low-side MOSFETs eliminate external switch losses and gate drive complexity |
| Factory-Programmed Output | 3.3V output set permanently in EEPROM-no external resistors required, ensuring ±1.1% accuracy across temperature |
| Type-Three On-Chip Compensation | Eliminates all external compensation components while maintaining ≥45° phase margin with recommended 4.7–6.8 µH / 120–220 µF LC networks |
| Split-Rail Input Architecture | Independent AVIN and PVIN supplies allow noise-sensitive control logic to be powered separately from noisy power stage inputs |
| Fault-Adaptive Soft-Start | Internal circuitry forces SS pin to track output voltage during faults (e.g., short-circuit), enabling graceful restart without output overshoot |
Applications
| Point-of-Load Regulation | FPGA Core Supply |
|---|---|
Use Scenario: Local DC-DC conversion near high-current digital loads on dense PCBs with tight space constraints. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V to I/O banks or auxiliary rails. Use Value: Achieves >90% efficiency at 2A load with minimal external components-reducing BOM count and board area vs. controller+MOSFET solutions. |
Use Scenario: Powering configurable logic blocks and transceivers in Xilinx or Intel FPGAs requiring clean, low-noise 3.3V I/O supply. IC Role / Device Role / Timing Role: Dedicated I/O rail regulator with fast transient response and <2 mV/A load regulation. Use Value: Internal type-three compensation ensures stability with standard 120–220 µF tantalum/niobium oxide output caps-avoiding costly polymer or MLCC arrays. |
| Broadband Networking | Industrial Embedded Control |
Use Scenario: Powering Ethernet PHYs, SFP modules, or packet processors in switches/routers where thermal density is critical. IC Role / Device Role / Timing Role: Secondary 3.3V supply derived from 5V or 3.3V backplane, supporting hot-swap and sequencing requirements. Use Value: 12 µA shutdown current enables low-power standby modes; thermal shutdown with 10°C hysteresis prevents latch-up during airflow interruption. |
Use Scenario: Reliable 3.3V rail generation in PLC I/O modules or motor drive controllers operating in −40°C to +85°C industrial environments. IC Role / Device Role / Timing Role: Main system supply for microcontrollers, ADCs, and isolated communication interfaces. Use Value: Guaranteed operation from −40°C to +125°C junction temperature and 38°C/W θJA enables convection-cooled designs without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54331DR | 3A, 570 kHz adjustable-output buck; requires external feedback resistors and compensation | Supports variable output (0.8–6V); less suitable for fixed 3.3V systems needing zero-resistor BOM | Select when output voltage flexibility or higher VIN (up to 28V) is required-LM2853MH-3.3 offers lower component count for fixed 3.3V use. |
| MP2333HG-33 | 3A, 1.2 MHz fixed 3.3V buck; smaller QFN-10 package; no split-rail AVIN/PVIN support | Lacks independent AVIN supply-less optimal for noise-sensitive analog sections sharing same input rail | Choose for space-constrained designs where 1.2 MHz allows smaller inductors; LM2853MH-3.3 preferred when analog/RF coexistence demands AVIN isolation. |
Compared with TPS54331DR and MP2333HG-33, LM2853MH-3.3 uniquely combines factory-fixed 3.3V output, split-rail input architecture, and integrated type-three compensation-reducing design time and external part count while maintaining thermal robustness in industrial and networking applications.
Availability
LM2853MH-3.3 is available at Aetrix Electronics and suitable for FPGA core supplies, broadband networking equipment, and industrial embedded control systems requiring stable component supply with long-term manufacturability.
Supply support for LM2853MH-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 and high-reliability industrial solutions.
The LM2853MH-3.3 belongs to TI's SIMPLE SWITCHER® synchronous buck regulator family, designed specifically for low-voltage, high-current point-of-load applications where simplicity, thermal performance, and production reliability are critical.
FAQ
What is the maximum input voltage the LM2853MH-3.3 can accept?
The LM2853MH-3.3 accepts up to 5.5V on its AVIN pin (control supply) and up to 5.5V on PVIN (power supply), with minimums of 3.0V and 1.5V respectively. Exceeding 6.0V on any pin risks permanent damage per absolute maximum ratings. For reliable operation, maintain AVIN ≥ PVIN and stay within the specified operating ranges.
Does the LM2853MH-3.3 require external compensation components?
No, the LM2853MH-3.3 integrates a complete type-three compensation network on-die. This eliminates external compensation capacitors and resistors, simplifying design and improving consistency. Stability is guaranteed only when using inductors (4.7–6.8 µH) and output capacitors (120–220 µF) within TI's recommended ranges.
How is the 3.3V output voltage set in the LM2853MH-3.3?
The 3.3V output is factory-programmed into internal EEPROM during wafer test and cannot be adjusted externally. The SNS pin connects to a precision 200 kΩ resistor divider inside the IC, establishing a fixed 3.3V feedback ratio-ensuring ±1.1% tolerance across temperature without external resistors.
Can the LM2853MH-3.3 operate with different voltages on AVIN and PVIN?
Yes-the LM2853MH-3.3 supports true split-rail operation: AVIN may be supplied independently from PVIN, provided AVIN ≥ PVIN and both remain within their respective operating ranges (AVIN: 3.0–5.5V; PVIN: 1.5–5.5V). This isolates noise-sensitive control circuitry from high-current power switching paths.
What thermal performance can be expected from the LM2853MH-3.3 in a typical layout?
With the exposed pad fully soldered to a 4-layer PCB's internal ground plane (≥80% coverage), the LM2853MH-3.3 achieves θJA = 38°C/W. At 3A load and 25°C ambient, junction temperature rises ~114°C-well below the 125°C max operating limit if ambient stays ≤35°C or airflow is added.
LM2853MH-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM2853MH-3.3 FAQ
1.How can I place an order for LM2853MH-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MH-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 LM2853MH-3.3 reliable?
The price and inventory of LM2853MH-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 LM2853MH-3.3 is usually 5 days.
3.What payment methods are accepted for LM2853MH-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MH-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MH-3.3?
LM2853MH-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MH-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 LM2853MH-3.3?
For technical support, including LM2853MH-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MH-3.3 requirements.
6.How does Aetrix verify that LM2853MH-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2853MH-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 LM2853MH-3.3 meets industry standards.
7.What is the process for return or replacement of LM2853MH-3.3?
All LM2853MH-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MH-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 LM2853MH-3.3 part is unused and in its original packaging.
Return procedure for LM2853MH-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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