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Texas Instruments LM2853MHX-1.8/NOPB
- Part No.:
- LM2853MHX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-1.8/NOPB.pdf
- Description:
- IC REG BUCK 1.8V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,770
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Product details
Overview
LM2853MHX-1.8/NOPB from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator in HTSSOP-14 (PWP) package, delivering factory-programmed 1.8 V output from 3–5.5 V input with ±1.1% line regulation, 40 mΩ high-side and 32 mΩ low-side MOSFETs, and internal type-three compensation. It serves as a point-of-load power supply for FPGA core rails.
For engineers reviewing the LM2853MHX-1.8/NOPB datasheet, LM2853MHX-1.8/NOPB pinout, LM2853MHX-1.8/NOPB application, or LM2853MHX-1.8/NOPB equivalent, this page delivers verified specifications, thermal performance data, soft-start configuration guidance, and real-world layout constraints for stable 1.8 V/3 A DC-DC conversion in space-constrained embedded systems.
Technical Context
The LM2853MHX-1.8/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 fixed switching frequency enables compact filter design using 4.7–6.8 µH inductors and 100–220 µF output capacitors with 70–120 mΩ ESR.
Split-rail operation is supported: AVIN powers control circuitry (3–5.5 V), while PVIN supplies power stage (1.5–5.5 V); PVIN must not exceed AVIN. Thermal shutdown activates at 165°C with 10°C hysteresis, and the exposed pad (EP) is internally tied to GND but requires external soldering to a ground plane for optimal thermal resistance (RθJA = 38°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 1.8 V ±1.1% over –40°C to 125°C junction temperature |
| Max Output Current | 3 A continuous load with internal current limit threshold of 3.6–5 A |
| Input Voltage Range | 3 V to 5.5 V on AVIN; 1.5 V to 5.5 V on PVIN - supports split-rail biasing |
| Switching Frequency | 550 kHz (±35%) - enables use of small 4.7–6.8 µH inductors and ceramic output caps |
| RDS(ON) | 40 mΩ (high-side PFET) and 32 mΩ (low-side NFET) at TJ = –40°C to 125°C |
| Quiescent Current | 12 µA in shutdown mode; 0.85–2 mA operating current in non-switching state |
| Soft-Start Time | Configurable via external capacitor (1–50 nF on SS pin); 3×RC time constant to reach 95% VOUT |
Pinout & Package
LM2853MHX-1.8/NOPB uses a 14-pin HTSSOP (PWP) package with 5.00 mm × 4.40 mm body size and exposed thermal pad (EP). The EP is internally connected to GND and must be soldered to an external ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control Circuit Supply | Provides regulated 3–5.5 V bias for internal logic; separate from power rail |
| 2 (EN) | Enable Input | Active-high enable; internally pulled up - device powers on by default unless pulled low |
| 3 (SGND) | Signal Ground | Low-noise reference for feedback and control circuits; must be isolated from power ground at PCB level |
| 4 (SS) | Soft-Start Control | Connects to external capacitor (1–50 nF) to set controlled ramp-up time for VOUT |
| 5 (NC) | No Connect | Must be tied to GND; no internal connection |
| 6,7 (PVIN) | Power Switch Supply | High-current input for MOSFETs; accepts 1.5–5.5 V; requires local 47 µF ceramic bulk cap |
| 8,9 (SW) | Switch Node | Drives external inductor; high dV/dt node - keep trace short and wide, avoid routing near SNS |
| 10,11 (PGND) | Power Ground | Return path for high-current switch loop; tie directly to PGND plane under IC |
| 12,13 (NC) | No Connect | Both pins must be tied to GND; no internal function |
| 14 (SNS) | Voltage Sense Input | Monitors output via 200 kΩ resistor divider; connect sense trace directly to load for accurate regulation |
| EP (Exposed Pad) | Thermal & Electrical GND | Internally connected to GND; solder to large PCB ground plane to achieve RθJA = 38°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity |
| Internal 40 mΩ / 32 mΩ MOSFETs | Enables full 3 A output without external switches; minimizes conduction loss and board area |
| 12 µA Shutdown Quiescent Current | Supports ultra-low-power standby modes in battery-backed or always-on systems |
| Factory-Programmed Output | 1.8 V option eliminates external feedback resistors - ensures accuracy and simplifies qualification |
| Exposed-Pad HTSSOP-14 Package | Delivers 38°C/W junction-to-ambient thermal resistance - critical for sustained 3 A operation in compact enclosures |
Applications
| Baseband Processor Core Supply | FPGA I/O Bank Regulation |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series baseband processors in 4G/LTE wireless infrastructure equipment requiring tight 1.8 V tolerance and fast transient response. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 1.8 V/2.5 A to processor core domain with <10 µs load-step recovery. Use Value: Internal type-three compensation and low RDS(ON) MOSFETs enable stable regulation under dynamic CPU load changes without external tuning. |
Use Scenario: Providing clean, low-noise 1.8 V supply to FPGA I/O banks in industrial programmable logic controllers with mixed-voltage interfaces. IC Role / Device Role / Timing Role: Local DC-DC converter placed adjacent to FPGA package to minimize IR drop and noise coupling into sensitive I/O signaling paths. Use Value: Exposed-pad thermal design and split-rail AVIN/PVIN support allow integration into thermally constrained PLC modules without derating. |
| Optical Transceiver Module Bias | Industrial Camera Sensor Rail |
|
Use Scenario: Generating 1.8 V bias for laser driver ASICs and TIAs in SFP+ optical transceivers operating in extended temperature ranges. IC Role / Device Role / Timing Role: Secondary regulator fed from 3.3 V intermediate rail, delivering precise 1.8 V with <±1.1% line/load regulation across –40°C to 125°C. Use Value: Factory-programmed output eliminates resistor tolerance errors; soft-start prevents inrush-induced optical signal disruption during hot-plug events. |
Use Scenario: Powering high-resolution CMOS image sensors in machine vision cameras where EMI-sensitive analog front-ends require ultra-low ripple. IC Role / Device Role / Timing Role: Dedicated 1.8 V supply for sensor digital interface and PLL circuitry, decoupled from noisy motor drive sections. Use Value: 550 kHz switching frequency allows effective filtering with small 220 µF tantalum/niobium oxide output caps - reducing board footprint vs lower-frequency alternatives. |
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, 600 kHz, 3–20 V input; adjustable output via external resistors; no factory-programmed 1.8 V option | Requires external feedback network; wider input range suits 12 V intermediate rails; higher max input limits use cases | Select when system requires flexibility across multiple output voltages or operates from >5.5 V sources |
| MP2315GJ-Z | 3 A, 500 kHz, 4.5–26 V input; adjustable output; 15 µA shutdown current; smaller TSOT23-8 package | Lacks exposed thermal pad and internal compensation - needs external RC network; higher min input excludes 3.3 V-only designs | Choose for cost-sensitive, space-constrained applications where 3.3 V input is unavailable and layout area is premium |
Compared with TPS54302DDCR and MP2315GJ-Z, LM2853MHX-1.8/NOPB offers guaranteed 1.8 V accuracy without resistor selection error, superior thermal performance via exposed pad, and simplified design through integrated compensation - making it optimal for volume production of fixed-output 1.8 V systems.
Availability
LM2853MHX-1.8/NOPB is available at Aetrix Electronics and suitable for FPGA core power, industrial camera sensor rails, optical transceiver biasing, and baseband processor supply requiring stable component supply across long-lifecycle embedded programs.
Supply support for LM2853MHX-1.8/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 product line delivers highly integrated, thermally optimized synchronous buck regulators targeting space- and efficiency-critical point-of-load applications in networking, computing, and test equipment.
FAQ
What is the recommended input capacitor for LM2853MHX-1.8/NOPB?
A 47 µF X5R/X7R ceramic capacitor placed close to the PVIN pins is recommended for LM2853MHX-1.8/NOPB, supplemented by a 1 µF ceramic bypass capacitor near the AVIN pin. This combination handles high RMS ripple current and filters both low- and high-frequency noise, ensuring stable operation under 3 A load transients. The LM2853MHX-1.8/NOPB datasheet specifies these values based on thermal and ESR requirements.
Does LM2853MHX-1.8/NOPB require external compensation components?
No, LM2853MHX-1.8/NOPB integrates a complete type-three compensation network, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, improves reliability, and guarantees stability when used with recommended inductor (4.7–6.8 µH) and output capacitor (100–220 µF, 70–120 mΩ ESR) values per the LM2853MHX-1.8/NOPB datasheet.
Can LM2853MHX-1.8/NOPB operate with separate AVIN and PVIN supplies?
Yes, LM2853MHX-1.8/NOPB supports split-rail operation: AVIN (3–5.5 V) powers control circuitry, while PVIN (1.5–5.5 V) supplies the power stage. PVIN must not exceed AVIN. This architecture allows efficient use of intermediate rails and reduces heat generation in the control section - a confirmed capability of LM2853MHX-1.8/NOPB per its functional description and recommended operating conditions.
What is the purpose of the exposed pad (EP) on LM2853MHX-1.8/NOPB?
The exposed pad (EP) on LM2853MHX-1.8/NOPB is internally connected to GND and serves dual thermal and electrical functions. It must be soldered to a large PCB ground plane to achieve the specified 38°C/W junction-to-ambient thermal resistance and maintain stable 3 A operation. Lab measurements confirm improved regulation performance when the EP is properly grounded - a requirement explicitly stated for LM2853MHX-1.8/NOPB in its mechanical documentation.
How is the soft-start time configured for LM2853MHX-1.8/NOPB?
The soft-start time for LM2853MHX-1.8/NOPB is set by an external capacitor (CSS) connected to the SS pin, with recommended values between 1 nF and 50 nF. The internal DAC resistor is 450 kΩ, so a 2.2 nF capacitor yields ~3 ms startup (3 × RC). This configuration prevents inrush current and ensures graceful recovery after fault conditions - a behavior validated in LM2853MHX-1.8/NOPB's application notes and typical characteristics.
LM2853MHX-1.8/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):
- 1.8V
- 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-1.8/NOPB FAQ
1.How can I place an order for LM2853MHX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-1.8/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-1.8/NOPB reliable?
The price and inventory of LM2853MHX-1.8/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-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM2853MHX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-1.8/NOPB?
LM2853MHX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-1.8/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-1.8/NOPB?
For technical support, including LM2853MHX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-1.8/NOPB requirements.
6.How does Aetrix verify that LM2853MHX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-1.8/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-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM2853MHX-1.8/NOPB?
All LM2853MHX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-1.8/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-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM2853MHX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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