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Texas Instruments LM2853MHX-1.2/NOPB
- Part No.:
- LM2853MHX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,144
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Product details
Overview
LM2853MHX-1.2/NOPB from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator with factory-programmed 1.2 V output, 40 mΩ high-side and 32 mΩ low-side MOSFETs, input voltage range of 3 V to 5.5 V, and internal type-three compensation - designed for FPGA/DSP core power delivery in space-constrained industrial and networking systems.
For engineers reviewing the LM2853MHX-1.2/NOPB datasheet, LM2853MHX-1.2/NOPB pinout, LM2853MHX-1.2/NOPB application, or LM2853MHX-1.2/NOPB equivalent, key selection considerations include its fixed 1.2 V output, HTSSOP-14 thermal performance, soft-start programmability via external capacitor, low 12 µA shutdown current, and compatibility with standard ceramic output capacitors (120–220 µF, 50–100 mΩ ESR).
Technical Context
The LM2853MHX-1.2/NOPB implements voltage-mode control with integrated PWM controller, dual MOSFET power switches, and on-chip type-three compensation - eliminating external compensation components. Its 550 kHz switching frequency enables compact magnetics while maintaining efficiency across 0–3 A load range.
It supports split-rail operation (AVIN ≥ PVIN), features thermal shutdown at 165 °C with 10 °C hysteresis, and includes UVLO (2.47 V rising threshold) and peak-current limiting (3.6–5 A). The SNS pin enables remote output voltage sensing for improved regulation accuracy under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±1.5% over –40°C to 125°C junction temperature |
| Max Output Current | 3 A continuous; supports full-load operation without derating up to 125°C with proper PCB thermal design |
| Input Voltage Range | 3 V to 5.5 V on AVIN/PVIN; PVIN may be as low as 1.5 V in split-rail mode (but ≤ AVIN) |
| Switching Frequency | 550 kHz nominal; ±30% variation over temperature ensures predictable EMI profile and inductor sizing |
| RDS(ON) (HS/LS) | 40 mΩ (high-side) / 32 mΩ (low-side) at TJ = 25°C; enables >90% efficiency at 2 A, 5 V → 1.2 V |
| Shutdown Current | 12 µA typical; allows ultra-low-power system standby states without external enable circuitry |
| Soft-Start Control | RC-based (450 kΩ internal resistor); 2.2 nF capacitor yields ~3 ms controlled startup, preventing inrush current |
Pinout & Package
LM2853MHX-1.2/NOPB uses the 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 | Powers internal logic, bias, and error amplifier; must be ≥3 V and ≥ PVIN in split-rail use |
| 2 (EN) | Enable input | Active-high; internally pulled up - device powers on by default unless driven low |
| 3 (SGND) | Analog ground | Low-noise reference for feedback and control circuits; separate from PGND to minimize noise coupling |
| 4 (SS) | Soft-start capacitor node | Connects to external capacitor (1–50 nF) to set startup ramp time and prevent overshoot |
| 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 MOSFET bridges; requires local 47 µF ceramic bulk capacitor |
| 8, 9 (SW) | Switch node | Drives external inductor; high dV/dt node requiring short, wide trace and EMI-aware layout |
| 10, 11 (PGND) | Power ground | Return path for high-switching currents; must connect directly to exposed pad and bulk capacitor ground |
| 14 (SNS) | Voltage sense input | Connects to output rail via dedicated Kelvin trace for accurate remote sensing and load regulation |
| EP (Exposed Pad) | Thermal & ground connection | Internally tied to GND but not primary current return; must be soldered to large PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed output | 1.2 V set permanently in EEPROM - eliminates external resistor divider and associated tolerance/temperature drift |
| Integrated type-three compensation | Removes need for external compensation network; simplifies design and improves loop stability across recommended LO/CO ranges |
| Internal MOSFETs (40/32 mΩ) | Enables single-chip 3 A solution with no external power switches; reduces BOM count and layout complexity |
| Low 12 µA shutdown current | Supports energy-sensitive applications like battery-backed systems or always-on monitoring nodes |
| HTSSOP-14 with exposed pad | Delivers superior thermal performance vs. standard SOIC; RθJA = 38 °C/W enables full 3 A load at 125°C ambient with 2 oz copper |
Applications
| Point-of-Load FPGA Core Supply | Industrial PLC I/O Module Power |
|---|---|
|
Use Scenario: Providing tightly regulated 1.2 V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA banks with dynamic current demands up to 3 A. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering stable core rail; handles rapid load transients via internal current-mode assist and fast-loop response. Use Value: Eliminates need for external compensation and discrete MOSFETs, reducing board area by >40% versus controller+MOSFET solutions while maintaining <±1.5% output accuracy over temperature. |
Use Scenario: Generating 1.2 V for ARM Cortex-M7 microcontroller cores in DIN-rail mounted programmable logic controllers operating in –40°C to +85°C environments. IC Role / Device Role / Timing Role: High-reliability, thermally robust step-down regulator powering safety-critical MCU subsystems with built-in thermal shutdown and UVLO protection. Use Value: Exposed-pad HTSSOP package sustains full 3 A load at 85°C ambient without heatsink; 12 µA shutdown current extends backup battery life during maintenance modes. |
| Broadband Router ASIC Power | Medical Imaging Sensor Interface |
|
Use Scenario: Supplying 1.2 V to Marvell Prestera or Broadcom BCM56xx switch ASICs in 1U rack-mounted edge routers with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-frequency (550 kHz) buck regulator enabling predictable EMI filtering; SW pin optimized for low-inductance inductor placement. Use Value: Switching frequency avoids sensitive 433/868 MHz ISM bands; integrated MOSFETs reduce radiated emissions vs. discrete solutions by minimizing high-dI/dt loop area. |
Use Scenario: Powering low-noise analog front-end (AFE) and ADC reference circuits in portable ultrasound probe electronics where PSRR and ripple matter. IC Role / Device Role / Timing Role: Clean, well-regulated 1.2 V rail with remote sensing (SNS pin) ensuring <10 mV load-induced deviation at point-of-load. Use Value: SGND/PGND separation and dedicated SNS trace path suppress digital switching noise coupling into analog signal chains, preserving SNR in 16-bit ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDCR | 3 A, 1.2 V fixed output; 2.5–6 V input; 500 kHz switching; 45 mΩ/25 mΩ RDS(ON); no internal compensation - requires external RC network | Requires external compensation and soft-start components; higher BOM count but offers adjustable frequency and more flexible loop tuning | Choose when design requires frequency synchronization or custom loop response; avoid if minimizing component count is critical |
| MP2315GJ-Z | 3 A, 1.2 V fixed output; 4.5–28 V input; 500 kHz; 80 mΩ/45 mΩ RDS(ON); integrated compensation; wider VIN range but higher RDS(ON) | Supports higher input voltages (up to 28 V) but delivers lower efficiency at 5 V → 1.2 V due to higher conduction losses | Choose only if input voltage exceeds 5.5 V; otherwise LM2853MHX-1.2/NOPB provides better efficiency and thermal performance at 3–5.5 V inputs |
Compared with TPS54302DDCR and MP2315GJ-Z, LM2853MHX-1.2/NOPB delivers superior thermal performance (38 °C/W vs. ≥55 °C/W), lower quiescent current (12 µA vs. 18–25 µA), and true plug-and-play operation with no external compensation - making it optimal for compact, thermally constrained 3–5.5 V systems.
Availability
LM2853MHX-1.2/NOPB is available at Aetrix Electronics and suitable for FPGA core power, industrial PLC modules, and broadband networking equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2853MHX-1.2/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-efficiency DC-DC conversion and industrial-grade reliability.
The LM2853 product line delivers fully integrated, factory-programmed synchronous buck regulators targeting space-constrained, thermally demanding point-of-load applications in communications, industrial automation, and computing infrastructure.
FAQ
What is the output voltage tolerance of LM2853MHX-1.2/NOPB over temperature?
The LM2853MHX-1.2/NOPB maintains a 1.2 V output with ±1.5% tolerance (1.173 V to 1.227 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 1.2 V option.
Does LM2853MHX-1.2/NOPB require external compensation components?
No, LM2853MHX-1.2/NOPB integrates a complete type-three compensation network on-die, eliminating the need for external resistors or capacitors in the feedback loop - a key differentiator that simplifies design and improves stability across recommended output filter component ranges.
What is the recommended soft-start capacitor value for LM2853MHX-1.2/NOPB?
A 2.2 nF ceramic capacitor is recommended for LM2853MHX-1.2/NOPB to achieve approximately 3 ms startup time; the datasheet specifies a valid range of 1 nF to 50 nF, with values outside this window risking uncontrolled start-up or fault recovery issues.
Can LM2853MHX-1.2/NOPB operate with separate AVIN and PVIN supplies?
Yes, LM2853MHX-1.2/NOPB supports split-rail operation: AVIN (≥3 V) powers control circuitry, while PVIN (≥1.5 V, ≤ AVIN) supplies the power stage - enabling optimized efficiency when input sources differ, such as using a 3.3 V AVIN and 5 V PVIN.
What thermal performance can be expected from LM2853MHX-1.2/NOPB in a standard 2-layer PCB?
With the exposed pad fully soldered to a 1-in² 2-oz internal ground plane, LM2853MHX-1.2/NOPB achieves RθJA = 38 °C/W - enabling continuous 3 A operation at up to 85°C ambient temperature without forced air or heatsink, as validated in TI's thermal characterization reports.
LM2853MHX-1.2/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):
- 1.2V
- 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-1.2/NOPB FAQ
1.How can I place an order for LM2853MHX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-1.2/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-1.2/NOPB reliable?
The price and inventory of LM2853MHX-1.2/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-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM2853MHX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-1.2/NOPB?
LM2853MHX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-1.2/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-1.2/NOPB?
For technical support, including LM2853MHX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-1.2/NOPB requirements.
6.How does Aetrix verify that LM2853MHX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-1.2/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-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM2853MHX-1.2/NOPB?
All LM2853MHX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-1.2/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-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM2853MHX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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