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Texas Instruments LM2853MHX-1.8
- Part No.:
- LM2853MHX-1.8
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-1.8.pdf
- Description:
- IC REG BUCK 1.8V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,557
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Product details
Overview
LM2853MHX-1.8 from Texas Instruments is a 3A, 550 kHz synchronous buck regulator in an exposed-pad HTSSOP-14 package, delivering a factory-programmed 1.8 V output with ±1.1% line regulation and 2 mV/A load regulation across −40°C to +125°C. It integrates internal 40 mΩ/32 mΩ MOSFETs, type-three compensation, and soft-start control for FPGA/DSP core power applications.
For engineers reviewing the LM2853MHX-1.8 datasheet, LM2853MHX-1.8 pinout, LM2853MHX-1.8 application, or LM2853MHX-1.8 equivalent, key selection criteria include input voltage range (3.0–5.5 V), thermal performance (θJA = 38 °C/W), shutdown current (12 µA), and compatibility with 4.7–6.8 µH inductors and 100–220 µF output capacitors per TI-recommended design guidelines.
Technical Context
The LM2853MHX-1.8 implements voltage-mode PWM control with internal type-three compensation, eliminating external compensation components. Its dual-rail architecture separates AVIN (3.0–5.5 V control supply) from PVIN (1.5–5.5 V power supply), enabling flexible biasing and improved transient response under split-rail operation.
Protection features include thermal shutdown at 165 °C (10 °C hysteresis), UVLO on AVIN (2.47–3.0 V threshold), and cycle-by-cycle peak current limiting (3.6–5 A). The switch node protection circuitry disables switching under no-load conditions to prevent false fault triggering, resuming normal operation upon load application.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 1.8 V ±1.1% over full temperature and line range - ensures stable core rail for low-voltage ASICs without external feedback resistors. |
| Max Output Current | 3 A continuous - supports high-current digital loads such as FPGA I/O banks or DSP memory interfaces. |
| Switching Frequency | 550 kHz (325–725 kHz range) - enables compact magnetics (e.g., 4.7 µH) while maintaining >90% efficiency at mid-load for 5 V → 1.8 V conversion. |
| Input Voltage Range | AVIN: 3.0–5.5 V; PVIN: 1.5–5.5 V - allows independent optimization of control logic and power stage supplies in multi-rail systems. |
| Quiescent Current | 12 µA in shutdown - minimizes standby power in battery-backed or always-on subsystems. |
| Thermal Resistance | θJA = 38 °C/W (MXA14A package) - requires minimal PCB copper area for thermal relief in space-constrained designs. |
| FET On-Resistance | P-FET: 40 mΩ typ; N-FET: 32 mΩ typ - reduces conduction loss and improves full-load efficiency vs. discrete MOSFET solutions. |
Pinout & Package
Package: HTSSOP-14 with exposed thermal pad (TI package drawing PWP, JEDEC MO-153 variant MXA14A). The exposed pad must be soldered to a PCB ground plane for thermal and electrical integrity but is not the primary GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control Circuit Supply Input | Provides regulated bias for internal logic; must be ≥3.0 V and ≤5.5 V; decoupled locally with 1 µF ceramic capacitor. |
| 2 (EN) | Enable Control Input | Active-high enable with internal pullup; asserts when voltage exceeds 75% of AVIN; pulls down to disable regulator. |
| 3 (SGND) | Signal Ground Reference | Low-noise analog ground for error amplifier and sensing; routed separately from PGND to minimize noise coupling. |
| 4 (SS) | Soft-Start Timing Node | Connects to external capacitor (1–50 nF) to control output ramp time; internal DAC charges reference for controlled startup. |
| 5 (NC) | No Connect | Must be tied to SGND; not internally connected; prevents floating node interference. |
| 6,7 (PVIN) | Power Switch Supply Input | High-current input for integrated FETs; requires low-ESR bulk capacitor (e.g., 47 µF ceramic) placed adjacent to pins. |
| 8,9 (SW) | Switch Node | Drives external inductor; high dV/dt node requiring short, wide trace routing and isolation from sensitive analog paths. |
| 10,11 (PGND) | Power Ground Return | High-current return path for FETs and inductor; joined to SGND at single point near IC to avoid ground bounce. |
| 12,13 (NC) | No Connect | Both pins must be tied to PGND; unused bond pads; grounding prevents EMI coupling. |
| 14 (SNS) | Output Voltage Sense Input | Monitors regulated output via internal 200 kΩ divider; connect sense trace directly to load for accurate remote sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity while ensuring stability with recommended LO/CO ranges. |
| Split-Rail AVIN/PVIN Architecture | Enables independent optimization: AVIN powers control logic (3.0–5.5 V), PVIN powers power stage (1.5–5.5 V) - improves efficiency in partial-load scenarios. |
| Factory-Programmed Output | Fixed 1.8 V output set via EEPROM - removes need for external feedback resistors and avoids resistor tolerance errors in precision core rails. |
| Thermal Shutdown with Hysteresis | Triggers at 165 °C with 10 °C hysteresis - prevents thermal runaway during overload or poor heatsinking while allowing safe recovery. |
| Low Shutdown Quiescent Current | 12 µA max - extends battery life in portable systems where regulator remains powered but inactive between operational cycles. |
Applications
| FPGA Core Power | DSP Local Regulation |
|---|---|
Use Scenario: Powering 1.8 V I/O banks and configuration logic in Xilinx Artix-7 or Intel Cyclone V FPGAs. IC Role / Device Role / Timing Role: Primary DC-DC step-down regulator supplying clean, tightly regulated 1.8 V at up to 3 A with fast transient response. Use Value: Meets FPGA vendor-specified ripple (<20 mVpp) and load-step requirements using TI-recommended 4.7 µH/150 µF output filter. |
Use Scenario: Delivering stable 1.8 V supply to TI C6000 DSP cores operating at 300–1000 MHz clock rates. IC Role / Device Role / Timing Role: Point-of-load regulator minimizing voltage droop during burst-mode instruction execution. Use Value: Achieves <1.5% total output deviation under 0–3 A load steps due to integrated compensation and low RDS(on) FETs. |
| Broadband Router CPU Core | Industrial PLC I/O Module |
Use Scenario: Regulating 1.8 V core voltage for Broadcom BCM63xx or Qualcomm Atheros QCA95xx SoCs in residential gateways. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 5 V intermediate bus with minimal thermal derating. Use Value: Delivers >92% peak efficiency at 2 A load (5 V → 1.8 V), reducing board-level heat generation in sealed enclosures. |
Use Scenario: Providing isolated 1.8 V logic rail for ARM Cortex-M7-based I/O modules in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Robust industrial-grade regulator supporting extended temperature range (−40°C to +125°C). Use Value: Maintains regulation across full temp range with guaranteed 2 mV/A load regulation and 165 °C thermal shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDCR | 3 A, 2.5–6 V input, adjustable output (0.6–5.5 V); requires external feedback resistors; 500 kHz fixed frequency. | Supports programmable output but adds two resistors and increases layout complexity; lower quiescent current (18 µA active). | Select when output voltage flexibility outweighs BOM simplicity and fixed 1.8 V is insufficient. |
| MP2307DN-LF-Z | 3 A, 4.5–26 V input, fixed 1.8 V output; no soft-start pin; higher RDS(on) (80/60 mΩ); θJA = 50 °C/W. | Limited to higher-input systems (>4.5 V); lacks AVIN/PVIN separation and soft-start control; less thermally efficient. | Select only for cost-sensitive, non-thermal-critical 5–12 V input applications where soft-start and split-rail operation are unnecessary. |
Compared with TPS54302DDCR and MP2307DN-LF-Z, the LM2853MHX-1.8 offers superior thermal performance (38 vs. ≥50 °C/W), integrated soft-start control, and factory-trimmed 1.8 V accuracy - making it optimal for space-constrained, thermally demanding FPGA/DSP core rails where design simplicity and reliability are prioritized.
Availability
LM2853MHX-1.8 is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, and broadband networking infrastructure requiring stable component supply and long-term manufacturability.
Supply support for LM2853MHX-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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and communications markets.
The LM2853MHX-1.8 belongs to TI's SIMPLE SWITCHER® synchronous buck regulator family, designed specifically for high-efficiency, low-component-count point-of-load conversion in digital system power supplies.
FAQ
What is the maximum input voltage the LM2853MHX-1.8 can accept?
The LM2853MHX-1.8 accepts AVIN (control supply) from 3.0 V to 5.5 V and PVIN (power supply) from 1.5 V to 5.5 V. Exceeding 5.5 V on either rail violates absolute maximum ratings and may cause permanent damage. For reliable operation, maintain AVIN ≥ PVIN and observe the 6.0 V absolute maximum limit on all pins.
Does the LM2853MHX-1.8 require external compensation components?
No, the LM2853MHX-1.8 integrates a type-three compensation network on-die. This eliminates external compensation capacitors and resistors, simplifying design and improving stability across the recommended inductor (4.7–6.8 µH) and output capacitor (100–220 µF) ranges specified in TI's datasheet.
Can the LM2853MHX-1.8 be used with a 3.3 V input to generate 1.8 V output?
Yes - the LM2853MHX-1.8 supports PVIN as low as 1.5 V, making 3.3 V → 1.8 V conversion fully valid. TI's Applications Information recommends using the 3.3 V row from Table 1 for LO/CO selection: 4.7 µH inductor and 100–220 µF capacitor with 70–120 mΩ ESR.
How is the 1.8 V output voltage set in the LM2853MHX-1.8?
The 1.8 V output is factory-programmed into on-chip EEPROM during manufacturing. No external resistors or configuration pins are required - the LM2853MHX-1.8 delivers precisely 1.8 V ±1.1% across temperature and line variations, verified per Electrical Characteristics table on page 2 of SNVS459.
What is the purpose of the exposed thermal pad on the LM2853MHX-1.8 package?
The exposed pad on the LM2853MHX-1.8 (HTSSOP-14, PWP drawing) is internally connected to GND and must be soldered to a PCB ground plane. It reduces θJA to 38 °C/W and improves regulation stability - TI's Layout Guidelines specify full-pad soldering for optimal thermal and electrical performance.
LM2853MHX-1.8 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):
- 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 FAQ
1.How can I place an order for LM2853MHX-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-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 LM2853MHX-1.8 reliable?
The price and inventory of LM2853MHX-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 LM2853MHX-1.8 is usually 5 days.
3.What payment methods are accepted for LM2853MHX-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-1.8?
LM2853MHX-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-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 LM2853MHX-1.8?
For technical support, including LM2853MHX-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-1.8 requirements.
6.How does Aetrix verify that LM2853MHX-1.8 is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-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 LM2853MHX-1.8 meets industry standards.
7.What is the process for return or replacement of LM2853MHX-1.8?
All LM2853MHX-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-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 LM2853MHX-1.8 part is unused and in its original packaging.
Return procedure for LM2853MHX-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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