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Texas Instruments LM2853MH-1.2/NOPB
- Part No.:
- LM2853MH-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MH-1.2/NOPB.pdf
- Description:
- IC REG BUCK 1.2V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,435
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Product details
Overview
LM2853MH-1.2/NOPB from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator with factory-programmed 1.2 V output, 3 V to 5.5 V input range, internal 40 mΩ/32 mΩ MOSFETs, and voltage-mode control-designed for FPGA/DSP core power in compact point-of-load systems.
For engineers reviewing the LM2853MH-1.2/NOPB datasheet, LM2853MH-1.2/NOPB pinout, LM2853MH-1.2/NOPB application, or LM2853MH-1.2/NOPB equivalent, key selection criteria include output voltage accuracy (±2.25% over –40°C to 125°C), thermal performance (RθJA = 38°C/W), soft-start programmability, and HTSSOP-14 package compatibility with high-current PCB layouts.
Technical Context
The LM2853MH-1.2/NOPB implements voltage-mode PWM control with integrated type-three compensation, eliminating external compensation components. Its dual-MOSFET power stage uses separate AVIN (control logic) and PVIN (power FET) rails, enabling split-rail operation where PVIN ≤ AVIN.
Internal protection includes thermal shutdown at 165°C (10°C hysteresis), current-limit threshold of 3.6–5 A, and UVLO with 2.47 V rising threshold and 50–260 mV hysteresis-ensuring robust startup and fault recovery without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 1.2 V ±2.25% (–40°C to 125°C), fixed and non-adjustable |
| Input Voltage Range | 3 V to 5.5 V on AVIN; 1.5 V to 5.5 V on PVIN-supports split-rail supply configurations |
| Max Output Current | 3 A continuous load capability with internal 40 mΩ high-side and 32 mΩ low-side MOSFETs |
| Switching Frequency | 550 kHz nominal (325–725 kHz range), enabling compact magnetics and predictable EMI profile |
| Quiescent Current | 12 µA shutdown current and 0.85–2 mA operating current-optimized for battery-backed or low-power standby modes |
| Thermal Resistance | RθJA = 38°C/W (HTSSOP-14 with exposed pad soldered to GND plane) |
| Soft-Start Control | RC-based timing via external capacitor (1–50 nF) on SS pin; 450 kΩ internal DAC resistor sets ramp rate |
Pinout & Package
LM2853MH-1.2/NOPB is housed in a 14-pin HTSSOP (PWP) package measuring 5.00 mm × 4.40 mm with an exposed thermal pad internally connected to GND-requiring soldering to a dedicated PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control supply input | Powers internal logic and bias circuitry; must be ≥3 V and ≥PVIN |
| 2 (EN) | Enable control | Active-high enable with 75% AVIN threshold; internal pullup ensures default-on operation |
| 3 (SGND) | Analog ground reference | Low-noise return for feedback and control circuits-must be isolated from power ground at PCB level |
| 4 (SS) | Soft-start timing node | Connects to external capacitor to control output voltage ramp rate; also used for fault recovery tracking |
| 5 (NC) | No-connect | Must be tied to SGND; not internally connected |
| 6,7 (PVIN) | Power switch supply | High-current input for internal MOSFETs; requires low-impedance path to bulk capacitor |
| 8,9 (SW) | Switch node | Drives external inductor; experiences full switching voltage swing (0 V to PVIN); critical for EMI layout |
| 10,11 (PGND) | Power ground return | High-current return path for MOSFETs and inductor-must connect directly to exposed pad and bulk capacitor |
| 12,13 (NC) | No-connect | Both pins must be tied to PGND; no internal connection |
| 14 (SNS) | Output voltage sense | High-impedance feedback input referenced to internal 200 kΩ divider; requires Kelvin connection near load |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates external compensation network-reduces BOM count and design iteration time for stable loop response |
| Exposed Thermal Pad (HTSSOP-14) | Enables direct thermal conduction to PCB ground plane, lowering junction temperature by up to 25°C vs. standard SOIC |
| Split-Rail Input Architecture | Allows independent AVIN (≥PVIN) and PVIN supplies-improves efficiency in multi-rail systems and reduces AVIN dissipation |
| Factory-Programmed Output | 1.2 V output permanently set in EEPROM-no external resistors required, ensuring accuracy and long-term stability |
| Low Standby Current | 12 µA shutdown current enables >1-year battery life in always-on monitoring applications with periodic wake-up |
Applications
| FPGA Core Power Supply | DSP Local Point-of-Load Regulation |
|---|---|
Use Scenario: Providing tightly regulated 1.2 V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA under dynamic load transients up to 2 A/µs. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering stable rail with <1% load regulation and fast transient response (<10 µs settling). Use Value: Internal MOSFETs and type-three compensation ensure <50 mV undershoot during 0–3 A step loads-eliminating need for external active clamp or feedforward circuits. |
Use Scenario: Generating 1.2 V core supply for TI C6000 DSPs in industrial motor control gate drivers with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating at 550 kHz to minimize inductor size while maintaining >90% efficiency at 2.5 A. Use Value: RθJA = 38°C/W and thermal shutdown with hysteresis prevent thermal runaway in enclosed enclosures without forced airflow. |
| Broadband Router SoC Power | ASIC Test Fixture Power |
Use Scenario: Powering 1.2 V I/O and core rails of Broadcom BCM68xx networking SoCs in 1U rack-mounted routers with dense component layout. IC Role / Device Role / Timing Role: Compact, thermally optimized DC-DC solution using HTSSOP-14 footprint to meet board area constraints. Use Value: Exposed pad soldering and dual PGND pins reduce thermal resistance by 35% vs. standard TSSOP-enabling 3 A continuous operation at 70°C ambient. |
Use Scenario: Programmable bench power for ASIC validation requiring precise 1.2 V output with remote sense and soft-start control during bring-up. IC Role / Device Role / Timing Role: Fixed-output regulator with SS pin accessible for lab-controlled ramp rates (e.g., 1–10 ms) to avoid inrush-induced test failures. Use Value: Factory-trimmed 1.2 V output eliminates calibration steps; SNS pin supports 4-wire Kelvin sensing for <±5 mV measurement accuracy at DUT terminals. |
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, 570-kHz buck with adjustable output (0.8–6 V) via external resistor divider; no factory-programmed option | Requires external feedback resistors and compensation; higher BOM count but supports dynamic voltage scaling | Select when output voltage flexibility or margin testing is required; not drop-in due to different pinout and compensation method |
| MP2332HGTL-Z | 3-A, 500-kHz buck with 1.2 V fixed option; smaller QFN-10 (3×3 mm) package; no split-rail AVIN/PVIN support | Lacks AVIN/PVIN separation-limits use in systems with disparate supply domains; lower thermal resistance (RθJA = 30°C/W) | Choose for space-constrained designs where single-rail input suffices and thermal headroom exceeds 38°C/W requirement |
Compared with TPS54331DR and MP2332HGTL-Z, LM2853MH-1.2/NOPB uniquely combines factory-set 1.2 V accuracy, split-rail operation, and integrated type-three compensation-reducing design risk in fixed-output, thermally demanding FPGA/DSP applications without sacrificing layout simplicity.
Availability
LM2853MH-1.2/NOPB is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, and broadband networking infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2853MH-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2853 family was designed specifically for high-efficiency, low-component-count point-of-load conversion in space- and thermal-constrained digital systems-emphasizing integration, reliability, and ease of implementation.
FAQ
What is the output voltage tolerance of LM2853MH-1.2/NOPB over temperature?
The LM2853MH-1.2/NOPB delivers 1.2 V with ±2.25% tolerance across the full operating junction temperature range of –40°C to 125°C, as specified in the Electrical Characteristics table (VOUT = 1.2 V option, TJ = –40°C to 125°C). This accuracy is factory-trimmed into EEPROM and does not require external calibration. The LM2853MH-1.2/NOPB maintains this specification without load or line adjustment-making it suitable for precision core rail applications.
Does LM2853MH-1.2/NOPB support split-rail operation, and what are the voltage constraints?
Yes, LM2853MH-1.2/NOPB supports split-rail operation using separate AVIN (control logic supply) and PVIN (power FET supply) inputs. AVIN must be ≥3 V and ≥PVIN; PVIN may range from 1.5 V to 5.5 V. This architecture isolates control circuitry from power-stage noise and improves efficiency when PVIN is derived from a lower-voltage intermediate rail. The LM2853MH-1.2/NOPB datasheet confirms this in Section 8.1.9 and Recommended Operating Conditions.
What is the recommended soft-start capacitor value for LM2853MH-1.2/NOPB, and why is there a range?
The LM2853MH-1.2/NOPB specifies a soft-start capacitor (CSS) range of 1 nF to 50 nF on the SS pin, based on internal 450 kΩ DAC resistance. A 2.2 nF capacitor yields ~3 ms startup time (three RC time constants), commonly used in reference designs like the 3.3 V to 1.2 V conversion in Table 5. Values outside this range risk uncontrolled startup or failure to recover from fault conditions-the LM2853MH-1.2/NOPB's internal fault logic ties SS voltage to output during shorts, requiring controlled capacitance for graceful restart.
How does the exposed thermal pad on LM2853MH-1.2/NOPB impact thermal performance?
The exposed pad on the LM2853MH-1.2/NOPB is internally connected to GND and must be soldered to a PCB ground plane to achieve the specified RθJA of 38°C/W. Without proper pad soldering, thermal resistance increases significantly-potentially raising junction temperature by >25°C at 3 A load. Layout guidelines (Section 9.1) emphasize full-pad soldering and wide thermal vias to maximize heat transfer. The LM2853MH-1.2/NOPB's thermal performance directly affects maximum sustained current and reliability in sealed or high-ambient environments.
Is LM2853MH-1.2/NOPB pin-compatible with other LM2853 variants like LM2853MH-1.8/NOPB?
Yes, all LM2853MH-x.x/NOPB variants-including LM2853MH-1.2/NOPB-are mechanically and electrically pin-compatible within the HTSSOP-14 (PWP) package. They share identical pin configuration, thermal pad layout, and functional pin roles. Output voltage is the only difference, factory-programmed into EEPROM; no changes to PCB layout, external components, or firmware are needed when substituting between 1.2 V, 1.5 V, or 1.8 V versions-enabling easy voltage optimization during design validation.
LM2853MH-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM2853MH-1.2/NOPB FAQ
1.How can I place an order for LM2853MH-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MH-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 LM2853MH-1.2/NOPB reliable?
The price and inventory of LM2853MH-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 LM2853MH-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM2853MH-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MH-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MH-1.2/NOPB?
LM2853MH-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MH-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 LM2853MH-1.2/NOPB?
For technical support, including LM2853MH-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MH-1.2/NOPB requirements.
6.How does Aetrix verify that LM2853MH-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2853MH-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 LM2853MH-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM2853MH-1.2/NOPB?
All LM2853MH-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MH-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 LM2853MH-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM2853MH-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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