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Texas Instruments LM2852XMXAX-1.8
- Part No.:
- LM2852XMXAX-1.8
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2852XMXAX-1.8.pdf
- Description:
- IC REG BUCK 1.8V 2A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2852XMXAX-1.8 from Texas Instruments is a 2A synchronous buck DC-DC regulator in HTSSOP-14 package, operating at 1.5MHz switching frequency with factory-set 1.8V output, 2.85–5.5V input range, and internal 60mΩ PMOS/NMOS power switches. It delivers stable point-of-load power for FPGA core rails and portable computing applications.
For engineers reviewing the LM2852XMXAX-1.8 datasheet, LM2852XMXAX-1.8 pinout, LM2852XMXAX-1.8 application, or LM2852XMXAX-1.8 equivalent, key selection criteria include 1.5MHz high-frequency operation enabling compact filter design, 10µA shutdown current, internal type-three compensation, and thermal shutdown with 165°C trip point.
Technical Context
The LM2852XMXAX-1.8 uses voltage-mode PWM control with integrated oscillator set to 1.5MHz (±25% over temperature), supporting duty cycles from 0% to 100%. Its internal type-three compensation network eliminates external compensation components while maintaining stability across recommended output capacitor ESR (100–200mΩ) and inductance (1–10µH) ranges.
It features dual-rail operation: AVIN powers logic circuitry (2.85–5.5V), while PVIN supplies power FETs (1.5–5.5V). The device integrates UVLO with 85–210mV hysteresis on AVIN and thermal shutdown with 10°C hysteresis, ensuring robust operation under transient and overload conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.25% (1.7595V to 1.8405V) at TJ = –40°C to +125°C - ensures precise core rail regulation for low-voltage digital ICs. |
| Switching Frequency | 1.5MHz (1050–1825kHz range) - enables use of small 1µH inductors and ceramic output capacitors for space-constrained designs. |
| Max Load Current | 2A continuous - supports high-current FPGA/DSP core domains without external current boosting. |
| Input Voltage Range | 2.85V to 5.5V on AVIN; 1.5V to 5.5V on PVIN - allows flexible split-rail supply architecture and compatibility with common intermediate bus voltages. |
| Quiescent Current | 2µA typical non-switching IQ; 10–25µA shutdown ISD - minimizes standby power loss in battery-powered systems. |
| Power Switch RDS(on) | 75–140mΩ PMOS / 55–120mΩ NMOS - limits conduction loss and enables >90% efficiency at 2A load with 3.3V input. |
| Soft-Start Time Control | Programmable via CSS pin (1–50nF range); 2.7nF yields ~3ms startup - prevents inrush current and ensures controlled power-up sequencing. |
Pinout & Package
LM2852XMXAX-1.8 is housed in a 14-pin HTSSOP package (PWP0014A) with exposed thermal pad, offering θJA = 38°C/W and rated for –40°C to +125°C junction temperature. The exposed pad must be soldered to a PCB ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVIN (1) | Logic bias supply | Provides power to internal control circuitry; must be ≥2.85V and ≤PVIN for proper operation. |
| EN (2) | Enable control | Internally pulled up; tie to GND to disable; floating or connected to AVIN enables regulation. |
| SGND (3) | Signal ground reference | Reference node for error amplifier and soft-start circuit; separate from PGND to minimize noise coupling. |
| SS (4) | Soft-start timing | Connects to external capacitor (1–50nF) to control output voltage ramp rate during startup. |
| NC (5,12,13) | No-connect | Must be left floating or tied to GND; no internal connection - avoid routing signals or power to these pins. |
| PVIN (6,7) | Main power input | Supplies internal power FETs; accepts 1.5–5.5V; requires low-ESR input capacitor placed adjacent to pins. |
| SNS (14) | Output voltage sense | High-impedance feedback node; connect directly to load for accurate remote sensing and minimal line-drop error. |
| SW (8,9) | Switch node | Drives external inductor; carries high di/dt square wave - requires short, wide trace to minimize EMI and voltage spikes. |
| PGND (10,11) | Power ground return | Low-impedance return path for switch current; must be connected to large copper pour or internal ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 1.8V output | Eliminates external resistor divider, reducing BOM count and layout sensitivity while guaranteeing ±2.25% accuracy over full temperature range. |
| 1.5MHz fixed-frequency operation | Enables use of sub-10µH inductors and low-ESR ceramic capacitors, cutting solution size by >40% versus 500kHz alternatives. |
| Integrated type-three compensation | Removes need for external compensation network, simplifying design and improving phase margin consistency across production lots. |
| Split-rail AVIN/PVIN architecture | Allows independent optimization of logic supply (e.g., 3.3V) and power rail (e.g., 5V), improving efficiency and noise isolation. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature and re-enables only after cooling by 10°C, preventing thermal cycling and ensuring safe recovery. |
Applications
| FPGA Core Power Supply | DSP Local Point-of-Load Regulation |
|---|---|
|
Use Scenario: Delivering clean, tightly regulated 1.8V to Xilinx Artix-7 or Intel Cyclone V FPGA core banks with dynamic current demand up to 2A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing core voltage with fast transient response and <1% output deviation under 1A/µs load steps. Use Value: Enables reliable FPGA configuration and operation at maximum clock speeds while minimizing board area with 1.5MHz switching and 1µH inductor. |
Use Scenario: Powering TI C6748 DSP core in industrial motor control gateway requiring stable 1.8V under variable processing loads. IC Role / Device Role / Timing Role: Standalone DC-DC converter supplying DSP core rail with internal soft-start and UVLO protection against brownout events. Use Value: Reduces system-level power sequencing complexity via integrated enable and shutdown controls, eliminating external supervisors. |
| Portable Computing Subsystem Rail | Broadband Networking PHY Interface |
|
Use Scenario: Generating 1.8V for USB 3.0 controller and PCIe endpoint logic in fanless mini-PC with strict thermal envelope. IC Role / Device Role / Timing Role: High-efficiency step-down regulator delivering 2A peak current with <10µA quiescent draw in sleep mode. Use Value: Extends battery life through ultra-low shutdown current and >92% efficiency at light loads (100mA) with 3.3V input. |
Use Scenario: Powering Ethernet PHY transceivers (e.g., Marvell 88E1512) in 1U rack-mounted switch with dense component layout. IC Role / Device Role / Timing Role: Local regulator decoupling PHY analog and digital sections using separate AVIN/PVIN supplies. Use Value: Improves signal integrity by isolating noisy power-switching paths from sensitive analog PHY circuitry via dedicated ground returns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2852YMXAX-1.8 | 500kHz switching frequency; wider inductor range (10–33µH); higher minimum output capacitance (68–220µF). | Better suited for cost-sensitive designs where EMI filtering is prioritized over size; less suitable for ultra-compact layouts. | Select when lower EMI and relaxed board area constraints outweigh the need for smallest possible solution size. |
| TPS62231DRYT | 3MHz switching; 0.6–5.5V adjustable output; 1.2A max load; different pinout and no split-rail AVIN/PVIN. | Requires external feedback resistors; lacks dedicated SNS pin for remote sensing; smaller 6-pin WSON package. | Choose for higher-frequency, lower-current applications where footprint reduction is critical and remote sensing is not required. |
Compared with LM2852YMXAX-1.8 and TPS62231DRYT, the LM2852XMXAX-1.8 uniquely balances 2A capability, 1.5MHz operation, and factory-trimmed 1.8V output in an industry-standard HTSSOP package-making it optimal for space-constrained, high-current FPGA/DSP core supplies requiring minimal external components.
Availability
LM2852XMXAX-1.8 is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, and portable computing subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2852XMXAX-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 IC design and manufacturing.
The LM2852XMXAX-1.8 belongs to TI's SIMPLE SWITCHER® synchronous buck regulator product line, engineered for high-efficiency, low-component-count DC-DC conversion in space- and thermally constrained applications such as portable electronics and communications infrastructure.
FAQ
What is the switching frequency tolerance of the LM2852XMXAX-1.8?
The LM2852XMXAX-1.8 has a nominal switching frequency of 1.5MHz with a guaranteed range of 1050kHz to 1825kHz across temperature and input voltage. This variation is inherent to its internal oscillator design and does not require external trimming. Designers should verify loop stability using the recommended 1–10µH inductor and 10–100µF ceramic output capacitor ranges specified in the datasheet for the LM2852X variant.
Can the LM2852XMXAX-1.8 operate with AVIN and PVIN supplied from different sources?
Yes, the LM2852XMXAX-1.8 supports true split-rail operation: AVIN powers the control logic (2.85–5.5V), while PVIN supplies the power FETs (1.5–5.5V). PVIN must always be ≤ AVIN. This architecture allows optimizing noise isolation-e.g., powering AVIN from a clean LDO while feeding PVIN directly from a noisy intermediate bus-without compromising regulation accuracy or thermal performance of the LM2852XMXAX-1.8.
What is the purpose of the SNS pin on the LM2852XMXAX-1.8, and how should it be connected?
The SNS pin on the LM2852XMXAX-1.8 is the high-impedance feedback node for the output voltage regulation loop. It must be connected directly to the load's power rail-ideally at the load's VCC pin-to enable remote sensing and compensate for IR drop in PCB traces. Connecting SNS to the regulator's output capacitor instead degrades load regulation accuracy. The LM2852XMXAX-1.8 achieves ±2.25% output tolerance only when SNS is properly routed per layout guidelines.
Does the LM2852XMXAX-1.8 require external compensation components?
No, the LM2852XMXAX-1.8 integrates a complete type-three compensation network, eliminating the need for external capacitors or resistors in the feedback path. This on-chip compensation is optimized for the recommended output filter components: 1–10µH inductors and 10–100µF ceramic capacitors with ESR between 100mΩ and 200mΩ. Deviating from these ranges may degrade phase margin and require re-evaluation of stability.
How does the soft-start function work on the LM2852XMXAX-1.8, and what capacitor value is recommended?
The LM2852XMXAX-1.8 implements soft-start by charging an internal 20pF node via a 400kΩ internal resistor, with external capacitor CSS connected to the SS pin extending the time constant. A 2.7nF capacitor yields ~3ms startup time, preventing inrush current and ensuring controlled voltage ramp. CSS values must remain within 1–50nF; outside this range, startup behavior becomes unpredictable and may trigger fault conditions.
LM2852XMXAX-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):
- 2.85V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM2852XMXAX-1.8 FAQ
1.How can I place an order for LM2852XMXAX-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2852XMXAX-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 LM2852XMXAX-1.8 reliable?
The price and inventory of LM2852XMXAX-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 LM2852XMXAX-1.8 is usually 5 days.
3.What payment methods are accepted for LM2852XMXAX-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2852XMXAX-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2852XMXAX-1.8?
LM2852XMXAX-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2852XMXAX-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 LM2852XMXAX-1.8?
For technical support, including LM2852XMXAX-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2852XMXAX-1.8 requirements.
6.How does Aetrix verify that LM2852XMXAX-1.8 is sourced from the original manufacturer or authorized distributors?
All LM2852XMXAX-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 LM2852XMXAX-1.8 meets industry standards.
7.What is the process for return or replacement of LM2852XMXAX-1.8?
All LM2852XMXAX-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM2852XMXAX-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 LM2852XMXAX-1.8 part is unused and in its original packaging.
Return procedure for LM2852XMXAX-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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