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Texas Instruments LM2852XMXAX-1.2
- Part No.:
- LM2852XMXAX-1.2
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2852XMXAX-1.2.pdf
- Description:
- IC REG BUCK 1.2V 2A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,497
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Product details
Overview
LM2852XMXAX-1.2 from Texas Instruments is a 2A synchronous buck regulator with fixed 1.2V output, 1.5MHz switching frequency, internal 60mΩ MOSFETs, voltage-mode control, and factory-programmed EEPROM setting. It operates from 2.85V–5.5V input and delivers tight ±1.35% output tolerance over –40°C to +125°C, targeting FPGA core power in space-constrained portable computing systems.
For engineers reviewing the LM2852XMXAX-1.2 datasheet, LM2852XMXAX-1.2 pinout, LM2852XMXAX-1.2 application, or LM2852XMXAX-1.2 equivalent, key selection criteria include its 1.5MHz high-frequency operation enabling compact 1µH inductors, integrated type-three compensation eliminating external compensation components, and HTSSOP-14 exposed-pad thermal design for sustained 2A load capability.
Technical Context
The LM2852XMXAX-1.2 implements voltage-mode PWM control with an internal oscillator fixed at 1500kHz and integrated type-three compensation network. Its architecture integrates dual MOSFET power switches (75mΩ PFET / 55mΩ NFET) and a precision DAC-based reference generator tied to the SNS pin via a 200kΩ/200kΩ resistor divider.
It features soft-start controlled by external capacitor on SS pin (1nF–50nF range), UVLO with 85mV hysteresis on AVIN, and thermal shutdown at 165°C with 10°C hysteresis. The device supports split-rail operation with independent AVIN (logic bias) and PVIN (power FET supply) inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2V ±1.35% (0.782V to 1.227V) over full temperature and line/load range - ensures stable core rail for low-voltage logic. |
| Switching Frequency | 1500kHz (typical), 1050–1825kHz over temperature - enables use of 1µH inductors and reduces output capacitance requirements. |
| Max Output Current | 2A continuous - supports high-current point-of-load applications such as FPGA I/O banks or DSP subsystems. |
| Input Voltage Range | 2.85V to 5.5V on AVIN; PVIN supports same range - compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus architectures. |
| Quiescent Current | 2mA typical (non-switching), 10µA shutdown - minimizes standby power loss in battery-powered systems. |
| Thermal Resistance | θJA = 38°C/W - achieved via exposed-pad HTSSOP-14 package, enabling full 2A operation without forced airflow. |
| Protection Features | UVLO (2.85V AVIN threshold), thermal shutdown (165°C), current limit (4.95A peak) - ensures robust operation under fault conditions. |
Pinout & Package
LM2852XMXAX-1.2 is housed in a 14-pin HTSSOP package (Package Drawing PWP0014A) with exposed thermal pad soldered to PCB ground plane for optimal thermal dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVIN (1) | Chip bias supply | Provides power to internal logic; must be ≥2.85V and ≤5.5V; can be tied to PVIN or separate low-noise rail. |
| EN (2) | Enable control | Internally pulled up; connect to GND to disable; VIH ≥75% AVIN, VIL ≤25% AVIN - supports simple system-level power sequencing. |
| SGND (3) | Signal ground reference | Reference node for error amplifier and internal circuitry; must be connected to clean analog ground plane. |
| SS (4) | Soft-start timing | Connects to external capacitor (1–50nF); sets startup ramp time via internal 400kΩ resistor - prevents inrush current and output overshoot. |
| NC (5,12,13) | No-connect | Must be left floating or tied to GND; no internal connection - avoids unintended coupling or parasitic paths. |
| PVIN (6,7) | Main power input | Supplies internal PFET source; handles high di/dt switching currents - requires low-ESR input capacitor placed adjacent to pins. |
| SW (8,9) | Power switch node | Drives external inductor; carries high-frequency square wave (0–PVIN); layout must minimize loop area to reduce EMI. |
| PGND (10,11) | Power ground return | High-current return path for PFET/NFET; must connect to solid internal ground plane - separates power and signal grounds. |
| SNS (14) | Output voltage sense | Feedback input referenced to 200kΩ/200kΩ divider; connect directly to load for accurate remote sensing - rejects PCB trace IR drop. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 1.2V output | Eliminates external feedback resistors and associated layout sensitivity - reduces BOM count and improves production yield. |
| Integrated type-three compensation | Removes need for external compensation network - simplifies design, shortens qualification cycle, and improves phase margin stability. |
| 1500kHz switching frequency | Enables use of sub-2µH ceramic inductors and <100µF output capacitance - shrinks solution footprint by >40% vs 500kHz alternatives. |
| Low 10µA shutdown current | Extends battery life in always-on subsystems - critical for portable computing and IoT edge nodes requiring ultra-low quiescent power. |
| Exposed-pad HTSSOP-14 package | Delivers 38°C/W θJA - sustains 2A continuous output at +85°C ambient without heatsink or airflow, reducing thermal management overhead. |
Applications
| FPGA Core Power Supply | DSP Local Point-of-Load Regulation |
|---|---|
|
Use Scenario: Providing tightly regulated 1.2V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA banks during dynamic reconfiguration. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering 2A peak current with fast transient response (<10µs recovery from 50% load step). Use Value: Factory-set 1.2V accuracy (±1.35%) and integrated compensation ensure stable core rail without tuning - accelerates FPGA power design validation. |
Use Scenario: Regulating 1.2V supply for TI C6748 DSP memory interface and L1 cache subsystem in industrial motor control gateways. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter operating at 1500kHz to minimize EMI near sensitive analog signal chains. Use Value: 1.5MHz switching allows 1µH inductor and ceramic output caps - reduces solution size by 35% and eliminates tantalum capacitor reliability concerns. |
| Broadband Router SoC Power | Portable Medical Sensor Hub |
|
Use Scenario: Generating 1.2V core rail for Broadcom BCM6855 SoC in 5G small cell base stations with strict thermal envelope limits. IC Role / Device Role / Timing Role: Thermally optimized buck regulator using exposed-pad HTSSOP-14 to dissipate 1.2W at full load in confined chassis. Use Value: 38°C/W θJA enables 2A operation at +70°C ambient without derating - eliminates need for thermal vias or copper pours in dense RF layouts. |
Use Scenario: Powering 1.2V ADC reference and microcontroller core in handheld ECG monitor with 7-day battery life requirement. IC Role / Device Role / Timing Role: Ultra-low-quiescent buck converter with 10µA shutdown mode activated between patient measurements. Use Value: Sub-10µA shutdown current extends coin-cell battery life beyond 2000 hours - meets IEC 62304 Class C energy budget constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2852YMXAX-1.2 | 500kHz switching frequency; higher inductor value (10–15µH) required; lower efficiency at light loads due to higher gate charge losses. | Better suited for cost-sensitive designs where board area is less constrained and EMI filtering is prioritized over size. | Select when 500kHz operation eases EMI compliance testing or when legacy 10–15µH inductors are already qualified. |
| TPS62231DRYT | 1.8–6.5V input; 1.2V fixed output; 3.6MHz switching; 0.75A max output; smaller 6-pin WSON package. | Targeted at ultra-compact, low-power applications (e.g., wearables) where 2A capability is unnecessary. | Choose only for sub-1A loads requiring minimal footprint - not a functional replacement for 2A LM2852XMXAX-1.2 requirements. |
Compared with LM2852YMXAX-1.2 and TPS62231DRYT, the LM2852XMXAX-1.2 uniquely balances 2A output, 1.5MHz frequency, and integrated compensation in HTSSOP-14 - making it the sole option for space-constrained, high-current FPGA/DSP core rails requiring zero external compensation.
Availability
LM2852XMXAX-1.2 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 LM2852XMXAX-1.2 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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2852XMXAX-1.2 belongs to TI's SIMPLE SWITCHER® synchronous buck regulator family, engineered for rapid, low-risk power design in portable computing, communications infrastructure, and industrial embedded systems.
FAQ
What is the guaranteed output voltage tolerance for LM2852XMXAX-1.2 across temperature and load?
The LM2852XMXAX-1.2 guarantees ±1.35% output voltage tolerance (1.173V to 1.227V) over the full –40°C to +125°C junction temperature range and 0–2A load, as confirmed by TI's electrical characteristics table under "VOUT Tolerance" for the 1.2V option. This specification includes line, load, and temperature effects - no additional resistor tolerance derating applies since the output is factory-programmed via EEPROM.
Can LM2852XMXAX-1.2 operate with PVIN = 3.3V and AVIN = 5.0V in split-rail configuration?
Yes, LM2852XMXAX-1.2 supports split-rail operation where PVIN = 3.3V and AVIN = 5.0V. The datasheet explicitly permits AVIN ≥ PVIN, and the 5.0V AVIN remains within the 2.85–5.5V operating range. This configuration improves efficiency by reducing gate drive losses on the PFET while maintaining full 2A output capability at 1.2V.
What is the minimum recommended soft-start capacitor value for LM2852XMXAX-1.2, and why is there a lower limit?
The minimum recommended soft-start capacitor for LM2852XMXAX-1.2 is 1nF, per the "Soft-start capacitance range" specification in the PIN DESCRIPTIONS section. Values below 1nF risk uncontrolled start-up in current-limit mode, causing output overshoot or failure to regulate - the internal 20pF reference node capacitance combined with the 400kΩ DAC resistor establishes this practical lower bound for stable ramp control.
Does LM2852XMXAX-1.2 require external compensation components?
No, LM2852XMXAX-1.2 does not require external compensation components. It integrates a complete type-three compensation network on-die, as stated in the FEATURES list and confirmed in the COMPENSATION section. This eliminates external capacitors and resistors typically needed for loop stability - reducing BOM count and layout complexity while ensuring consistent performance across output capacitor ESR and inductance variations.
What is the peak current limit threshold for LM2852XMXAX-1.2, and how is it used in design?
The peak current limit threshold for LM2852XMXAX-1.2 is 4.95A (maximum), per the Electrical Characteristics table under "LM2852X Peak Current Limit Threshold". This value defines the instantaneous switch current at which the controller disables the high-side FET to prevent damage. Designers use it to select inductors with saturation current (Isat) >2.06A (2A load + 60mA ripple) and ensure worst-case peak current stays below 4.95A during transients or startup.
LM2852XMXAX-1.2 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):
- 1.2V
- 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-1.2 FAQ
1.How can I place an order for LM2852XMXAX-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2852XMXAX-1.2 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-1.2 reliable?
The price and inventory of LM2852XMXAX-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2852XMXAX-1.2 is usually 5 days.
3.What payment methods are accepted for LM2852XMXAX-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2852XMXAX-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2852XMXAX-1.2?
LM2852XMXAX-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2852XMXAX-1.2 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-1.2?
For technical support, including LM2852XMXAX-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2852XMXAX-1.2 requirements.
6.How does Aetrix verify that LM2852XMXAX-1.2 is sourced from the original manufacturer or authorized distributors?
All LM2852XMXAX-1.2 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-1.2 meets industry standards.
7.What is the process for return or replacement of LM2852XMXAX-1.2?
All LM2852XMXAX-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM2852XMXAX-1.2, 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-1.2 part is unused and in its original packaging.
Return procedure for LM2852XMXAX-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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