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Texas Instruments LM2853MH-1.8
- Part No.:
- LM2853MH-1.8
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MH-1.8.pdf
- Description:
- IC REG BUCK 1.8V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,697
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Product details
Overview
LM2853MH-1.8 from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator in an HTSSOP-14 package, delivering a factory-programmed 1.8 V output with ±2.25% tolerance over –40°C to 125°C. It operates from 3 V to 5.5 V input, integrates 40 mΩ high-side and 32 mΩ low-side MOSFETs, and features internal type-three compensation for minimal external components. It serves as a point-of-load regulator for FPGA core supplies.
For engineers reviewing the LM2853MH-1.8 datasheet, LM2853MH-1.8 pinout, LM2853MH-1.8 application, or LM2853MH-1.8 equivalent, key selection criteria include its fixed 1.8 V output, 3 A continuous load capability, 12 µA shutdown current, 550 kHz switching frequency, and thermal performance enabled by the exposed-pad HTSSOP package.
Technical Context
The LM2853MH-1.8 implements voltage-mode control with internal PWM controller, synchronous rectification, and on-die type-three compensation-eliminating need for external compensation networks. Its dual-rail input architecture separates AVIN (3–5.5 V control supply) from PVIN (1.5–5.5 V power supply), enabling flexible biasing and improved transient response.
Protection features include cycle-by-cycle peak current limiting (3.6–5 A threshold), thermal shutdown at 165°C with 10°C hysteresis, and UVLO on AVIN (2.47–3.0 V rising edge). The SNS pin enables remote output sensing for precise load regulation, while SS pin supports externally adjustable soft-start via capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.25% over full temperature and line range - ensures stable core rail for 1.8 V logic domains. |
| Max Output Current | 3 A continuous - supports high-current FPGA/DSP core loads without external current sharing. |
| Switching Frequency | 550 kHz (325–725 kHz range) - balances efficiency, filter size, and EMI; enables compact 4.7–6.8 µH inductors. |
| Input Voltage Range | 3 V to 5.5 V on AVIN; 1.5 V to 5.5 V on PVIN - supports split-rail operation and compatibility with common intermediate bus voltages. |
| RDS(on) (HS/LG) | 40 mΩ / 32 mΩ - minimizes conduction loss at 3 A, enabling >90% efficiency at mid-load with 5 V input. |
| Shutdown Current | 12 µA - enables ultra-low-power system standby modes without external enable circuitry. |
| Soft-Start Control | RC-based (450 kΩ internal resistor) - allows precise 1–3 ms startup time using 1–2.2 nF external capacitor. |
Pinout & Package
LM2853MH-1.8 is housed in a thermally enhanced 14-pin HTSSOP (PWP) package (5.00 mm × 4.40 mm) with exposed pad soldered to PCB ground for optimal thermal dissipation (RθJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control Circuit Supply | Provides regulated bias for internal logic; must be ≥3 V for guaranteed operation. |
| 2 (EN) | Enable Input | Active-high; internally pulled up - device powers on by default unless pulled low. |
| 3 (SGND) | Analog Ground | Low-noise reference for error amplifier and feedback network; separate from PGND. |
| 4 (SS) | Soft-Start | Controls ramp rate of output voltage; connects to external capacitor for programmable startup. |
| 5, 12, 13 (NC) | No Connect | Must be tied to ground per datasheet; not internally connected. |
| 6, 7 (PVIN) | Power Switch Supply | High-current input for FETs; requires local bulk capacitance near pins. |
| 8, 9 (SW) | Switch Node | Drives external inductor; high dV/dt node requiring short, wide trace routing. |
| 10, 11 (PGND) | Power Ground | Return path for high-switching currents; must connect to SGND at single point near IC. |
| 14 (SNS) | Voltage Sense | Connects to load-side feedback divider or directly to load for accurate remote sensing. |
| EP (Exposed Pad) | Thermal & Electrical Ground | Internally connected to GND; must be soldered to large PCB ground plane for thermal and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Programmed Output | 1.8 V set permanently at wafer test - eliminates external feedback resistors and associated tolerance stack-up. |
| Synchronous Rectification | Integrated 40 mΩ/32 mΩ MOSFET pair - removes need for external Schottky diode, improving light-load efficiency. |
| Internal Type-Three Compensation | On-die compensation network - reduces BOM count to only 4 external components (CIN, CSS, LO, CO) for stable operation. |
| Split-Rail Input Architecture | Independent AVIN and PVIN supplies - allows optimization of control logic supply (e.g., 3.3 V) while powering FETs from lower PVIN (e.g., 2.5 V). |
| Robust Protection Suite | Includes overcurrent limit, thermal shutdown with hysteresis, and AVIN UVLO - prevents damage during fault conditions without external supervision. |
Applications
| FPGA Core Power | DSP Local Regulation |
|---|---|
|
Use Scenario: Powering 1.8 V I/O or core rails of Xilinx Artix-7 or Intel Cyclone V FPGAs in industrial control systems. IC Role / Device Role / Timing Role: Primary point-of-load DC-DC converter delivering tightly regulated 1.8 V at up to 3 A with fast transient response. Use Value: Eliminates need for external feedback resistors and compensation components, reducing layout area and qualification effort for FPGA power trees. |
Use Scenario: Supplying 1.8 V core voltage to TI C6000 DSPs in broadband base station transceivers. IC Role / Device Role / Timing Role: High-efficiency synchronous buck regulator operating at 550 kHz to minimize EMI in RF-sensitive environments. Use Value: 12 µA shutdown current enables deep-sleep modes; integrated MOSFETs reduce thermal footprint versus discrete solutions. |
| ASIC Point-of-Load | Networking SoC Supply |
|
Use Scenario: Providing 1.8 V supply to custom ASICs in packet-processing modules with strict thermal constraints. IC Role / Device Role / Timing Role: Compact, thermally optimized regulator using exposed-pad HTSSOP for direct PCB heat sinking. Use Value: RθJA = 38°C/W enables 3 A operation without heatsink in 70°C ambient; soft-start prevents inrush into large ASIC decoupling banks. |
Use Scenario: Generating 1.8 V rail for Marvell ARMADA or Broadcom BCM SoCs in enterprise switches. IC Role / Device Role / Timing Role: Secondary-stage regulator fed from 3.3 V or 5 V intermediate bus, supporting dynamic voltage scaling. Use Value: Split-rail inputs allow AVIN = 3.3 V (logic supply) and PVIN = 3.3 V or 5 V (power rail), optimizing efficiency across load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDAR | 3 A, 600 kHz, adjustable output (0.6–6 V) via external resistors; no factory-programmed 1.8 V option. | Requires feedback network and compensation tuning; better for designs needing multiple output voltages. | Select when flexibility in output voltage or external loop control is required; not drop-in for fixed 1.8 V use. |
| MP2315DJ-LF-Z | 3 A, 500 kHz, fixed 1.8 V output; smaller 8-pin SOIC package; lacks split-rail inputs and soft-start pin. | Lower thermal performance (no exposed pad); limited to single-rail input; no remote sense or programmable soft-start. | Select for space-constrained, cost-sensitive applications where thermal headroom and advanced features are secondary. |
Compared with TPS54302DDAR and MP2315DJ-LF-Z, LM2853MH-1.8 provides guaranteed 1.8 V accuracy without external resistors, superior thermal management via exposed-pad HTSSOP, and design flexibility through independent AVIN/PVIN rails and configurable soft-start - making it optimal for high-reliability FPGA/DSP core supplies.
Availability
LM2853MH-1.8 is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, ASIC point-of-load, networking SoC supply, and industrial embedded systems requiring stable component supply and long-term manufacturability.
Supply support for LM2853MH-1.8 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 technologies, with decades of expertise in high-efficiency DC-DC conversion.
The LM2853MH-1.8 belongs to TI's LM28xx synchronous buck regulator family, designed specifically for low-voltage, high-current point-of-load applications in FPGA, DSP, and ASIC power delivery where simplicity, thermal performance, and factory-trimmed accuracy are critical.
FAQ
What is the output voltage tolerance of the LM2853MH-1.8 over temperature and line?
The LM2853MH-1.8 delivers a factory-programmed 1.8 V output with ±2.25% tolerance across –40°C to 125°C junction temperature and full input voltage range. This is confirmed in Section 6.5 of the datasheet: min 1.7595 V, typ 1.8 V, max 1.8405 V under specified conditions. The tight tolerance eliminates need for post-manufacturing calibration in 1.8 V core applications.
Does the LM2853MH-1.8 require external compensation components?
No, the LM2853MH-1.8 integrates a complete type-three compensation network on-die. As stated in the Features and Description sections, this enables stable operation with only four external components: input capacitor, soft-start capacitor, output inductor, and output capacitor. External compensation is neither required nor supported.
Can the LM2853MH-1.8 operate with different voltages on AVIN and PVIN?
Yes, the LM2853MH-1.8 supports true split-rail operation: AVIN (3–5.5 V) powers control circuitry, while PVIN (1.5–5.5 V) powers the power FETs. Section 8.1.9 confirms PVIN may be lower than AVIN - e.g., AVIN = 3.3 V and PVIN = 2.5 V - enabling optimized efficiency and reduced stress on power switches.
What is the purpose of the SNS pin on the LM2853MH-1.8?
The SNS (Sense) pin on the LM2853MH-1.8 enables remote output voltage sensing by connecting directly to the load, compensating for IR drop in PCB traces. As described in Section 8.1.3 and Figure 10, this ensures the regulated voltage at the load matches the 1.8 V target precisely - critical for low-voltage, high-current FPGA/DSP cores.
Is the LM2853MH-1.8 RoHS-compliant and lead-free?
Yes, the LM2853MH-1.8/NOPB.A is RoHS-compliant and lead-free, with Sn (matte tin) lead finish and MSL Level-1 rating (260°C peak reflow). This is verified in the Package Option Addendum (page 16), which lists "Yes" under RoHS and "SN" under Lead finish/Ball material for all LM2853MH-1.8 variants.
LM2853MH-1.8 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):
- 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
LM2853MH-1.8 FAQ
1.How can I place an order for LM2853MH-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MH-1.8 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-1.8 reliable?
The price and inventory of LM2853MH-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2853MH-1.8 is usually 5 days.
3.What payment methods are accepted for LM2853MH-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MH-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MH-1.8?
LM2853MH-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MH-1.8 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-1.8?
For technical support, including LM2853MH-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MH-1.8 requirements.
6.How does Aetrix verify that LM2853MH-1.8 is sourced from the original manufacturer or authorized distributors?
All LM2853MH-1.8 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-1.8 meets industry standards.
7.What is the process for return or replacement of LM2853MH-1.8?
All LM2853MH-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MH-1.8, 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-1.8 part is unused and in its original packaging.
Return procedure for LM2853MH-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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