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Texas Instruments LM2853MHX-2.5
- Part No.:
- LM2853MHX-2.5
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-2.5.pdf
- Description:
- IC REG BUCK 2.5V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,448
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Product details
Overview
LM2853MHX-2.5 from Texas Instruments is a 3A, 550 kHz synchronous buck regulator in an exposed-pad HTSSOP-14 package, delivering a factory-programmed 2.5V output with ±2.25% tolerance (2.4437 V to 2.5563 V) across −40°C to +125°C. It operates from 3.0V–5.5V input, integrates internal 40 mΩ/32 mΩ MOSFETs, type-three compensation, and supports low-voltage point-of-load regulation for FPGA/DSP core supplies.
For engineers reviewing the LM2853MHX-2.5 datasheet, LM2853MHX-2.5 pinout, LM2853MHX-2.5 application, or LM2853MHX-2.5 equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-chain support for industrial and embedded power designs.
Technical Context
The LM2853MHX-2.5 implements voltage-mode PWM control with integrated high-side and low-side MOSFETs (RDS(ON) = 40 mΩ / 32 mΩ), enabling efficient 3A DC-DC conversion at 550 kHz switching frequency. Its internal type-three compensation eliminates external compensation components and ensures stability with recommended LO/CO ranges (e.g., 4.7–6.8 µH inductor, 100–220 µF output capacitor).
It features split-rail operation (AVIN = 3.0–5.5V for control logic; PVIN = 1.5–5.5V for power stage), soft-start via external CSS capacitor (1–50 nF), and thermal shutdown at 165°C with 10°C hysteresis. The device maintains 12 µA shutdown quiescent current and supports precise output sensing via dedicated SNS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 2.5V ±2.25% (2.4437 V–2.5563 V); no external feedback resistors required. |
| Max Output Current | 3A continuous; peak current limit threshold is 3.6–5A, preventing overcurrent damage during transients. |
| Input Voltage Range | 3.0V–5.5V on AVIN (control rail); PVIN supports 1.5V–5.5V (power rail), enabling flexible split-rail biasing. |
| Switching Frequency | 550 kHz nominal (325–725 kHz range); enables compact magnetics and balances efficiency vs. EMI. |
| Quiescent Current | 0.85–2 mA operating IQ; 12–50 µA shutdown current - critical for battery-backed or always-on systems. |
| Thermal Resistance | θJA = 38 °C/W (MXA14A package); exposed pad must be soldered to PCB ground plane for thermal performance. |
| Enable Threshold | VIH = 75% of AVIN, VIL = 25% of AVIN; internal pullup ensures default-enable behavior unless actively pulled low. |
Pinout & Package
Package: HTSSOP-14 with exposed thermal pad (TI package drawing PWP, JEDEC MO-153 variant MXA14A). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control Circuit Supply | Provides regulated bias for internal logic; must be ≥3.0V and ≤5.5V; decoupling capacitor required near pin. |
| 2 (EN) | Enable Input | Active-high enable with internal pullup; drives high to activate regulator; low disables output and reduces IQ to 12 µA. |
| 3 (SGND) | Analog Ground Reference | Low-noise ground return for error amplifier and reference circuitry; must be isolated from PGND at star point. |
| 4 (SS) | Soft-Start Control | Connects to external capacitor (1–50 nF) to control ramp rate of output voltage; prevents inrush current. |
| 5 (NC) | No Connect | Internally unconnected; must be tied to SGND or PGND per layout guidelines. |
| 6,7 (PVIN) | Power Switch Supply | High-current input for internal FETs; accepts 1.5V–5.5V; requires low-ESR bulk capacitor placed adjacent to pins. |
| 8,9 (SW) | Power Switch Node | Drives external inductor; high dV/dt node requiring short, wide trace and minimal loop area to reduce EMI. |
| 10,11 (PGND) | Power Ground Return | High-current return path for FETs and inductor; must connect to broad ground plane and tie to EP and SGND at single point. |
| 12,13 (NC) | No Connect | Internally unconnected; both must be tied to PGND or SGND to ensure mechanical stability and thermal conduction. |
| 14 (SNS) | Output Voltage Sense | High-impedance feedback input; connects directly to load for accurate remote sensing; avoid routing near SW or PGND. |
| EP (Exposed Pad) | Thermal & Electrical Ground | Internally connected to GND but not primary GND path; must be soldered to ≥1 cm² PCB copper pour for θJA = 38 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates external compensation network; guarantees stability with recommended LO/CO values (e.g., 4.7 µH + 150 µF). |
| Synchronous Power Stage | Internal 40 mΩ high-side and 32 mΩ low-side MOSFETs reduce conduction loss and improve full-load efficiency vs. diode-based buck. |
| Factory-Programmed Output | 2.5V output set permanently in EEPROM; no external resistor divider needed - reduces BOM count and layout sensitivity. |
| Split-Rail Input Architecture | Separate AVIN (3.0–5.5V) and PVIN (1.5–5.5V) rails allow optimized biasing - e.g., 3.3V AVIN + 5V PVIN for mixed-supply systems. |
| Robust Protection Suite | Includes thermal shutdown (165°C, 10°C hysteresis), overcurrent limiting (3.6–5A), and UVLO (2.47V rising threshold). |
Applications
| FPGA Core Power Supply | DSP Local Point-of-Load Regulation |
|---|---|
|
Use Scenario: Providing stable 2.5V core voltage to Xilinx Spartan-6 or Intel Cyclone IV FPGA banks under dynamic load transitions up to 3A. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator with fast transient response enabled by internal compensation and low RDS(ON) FETs. Use Value: Delivers ±2.25% output accuracy across temperature and line, minimizing core voltage margining and enabling lower-power FPGA operation. |
Use Scenario: Regulating 2.5V supply for TI C674x DSP I/O or memory interface circuits in industrial motor control gateways. IC Role / Device Role / Timing Role: Local buck converter placed adjacent to DSP package to minimize IR drop and noise coupling. Use Value: Exposed-pad HTSSOP-14 package achieves 38 °C/W θJA, sustaining 3A output without heatsink in 70°C ambient environments. |
| Broadband Router SoC Power | Industrial PLC Digital I/O Module |
|
Use Scenario: Generating 2.5V for Broadcom BCM63xx or Qualcomm Atheros QCA95xx communication SoCs in residential gateways. IC Role / Device Role / Timing Role: Main system power rail regulator with soft-start (via 2.2 nF CSS) to prevent inrush-induced brownouts on shared 5V bus. Use Value: 550 kHz switching frequency allows use of small 4.7 µH inductors and 120 µF tantalum output capacitors, reducing board area by >30% vs. 300 kHz solutions. |
Use Scenario: Powering 2.5V logic for isolated digital input/output ASICs in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 5V backplane; operates continuously across −40°C to +85°C industrial range. Use Value: Guaranteed −40°C to +125°C junction operation and 12 µA shutdown current support extended cold-start capability and low standby power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54328DDAR | 3A, 2.95–6V input, adjustable output (0.8–4.5V) via external resistors; 570 kHz fSW; no internal compensation. | Requires external compensation and feedback divider; better suited for designs needing output flexibility or higher VIN. | Select when adjustable output or wider input range (2.95V) is required; accept added component count and layout complexity. |
| MP2332HGRT-Z | 3A, 4.5–28V input, fixed 2.5V output; 500 kHz fSW; integrated compensation; smaller TSOT23-8 package. | Higher minimum input (4.5V) limits use with 3.3V sources; lacks split-rail AVIN/PVIN architecture and soft-start pin. | Choose for space-constrained 5V-input applications where thermal pad area is limited; avoid if AVIN < 4.5V or soft-start control is needed. |
Compared with LM2853MHX-2.5, TPS54328DDAR offers design flexibility at the cost of external components, while MP2332HGRT-Z saves board area but sacrifices input voltage range and precision enable/soft-start control - making LM2853MHX-2.5 optimal for fixed 2.5V, 3.0–5.5V input, thermally demanding industrial loads.
Availability
LM2853MHX-2.5 is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, and broadband networking infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for LM2853MHX-2.5 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 series belongs to TI's SIMPLE SWITCHER® synchronous buck regulator family, designed specifically for low-voltage, high-current point-of-load applications in communications, industrial, and computing systems where simplicity, thermal performance, and factory-configured reliability are critical.
FAQ
What is the guaranteed output voltage tolerance for LM2853MHX-2.5 over temperature?
The LM2853MHX-2.5 has a guaranteed output voltage tolerance of ±2.25% (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 = 2.5V option" with bold-face min/max limits.
Can LM2853MHX-2.5 operate with separate AVIN and PVIN supplies?
Yes, LM2853MHX-2.5 supports split-rail operation: AVIN (3.0–5.5V) powers the control circuitry, while PVIN (1.5–5.5V) powers the power FETs. PVIN must be ≤ AVIN, and output filter components should be selected based on the PVIN value - for PVIN < 3.3V, use values recommended for 3.3V output.
What is the recommended soft-start capacitor value for LM2853MHX-2.5?
The LM2853MHX-2.5 datasheet specifies a soft-start capacitor (CSS) range of 1 nF to 50 nF. A typical value is 2.2 nF (e.g., Vishay-Vitramon VJ0805Y222KXXA), yielding ~3 ms startup time. Values outside this range may cause erratic startup or fail to meet fault-recovery requirements.
Does LM2853MHX-2.5 require external compensation components?
No, LM2853MHX-2.5 integrates a type-three compensation network on-die. This eliminates external compensation components and simplifies design - but requires adherence to recommended inductor (4.7–6.8 µH) and output capacitor (100–220 µF) ranges to maintain ≥45° phase margin and stability.
What thermal performance can be expected from LM2853MHX-2.5 in standard PCB layout?
With the exposed thermal pad (EP) fully soldered to a ≥1 cm² internal or external ground plane, LM2853MHX-2.5 achieves θJA = 38 °C/W. At 3A load and 5V input, typical junction temperature rise is ~114°C above ambient - confirming need for adequate copper area and airflow in sealed enclosures.
LM2853MHX-2.5 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):
- 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 FAQ
1.How can I place an order for LM2853MHX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-2.5 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 reliable?
The price and inventory of LM2853MHX-2.5 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 is usually 5 days.
3.What payment methods are accepted for LM2853MHX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-2.5?
LM2853MHX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-2.5 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?
For technical support, including LM2853MHX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-2.5 requirements.
6.How does Aetrix verify that LM2853MHX-2.5 is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-2.5 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 meets industry standards.
7.What is the process for return or replacement of LM2853MHX-2.5?
All LM2853MHX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-2.5, 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 part is unused and in its original packaging.
Return procedure for LM2853MHX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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