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Texas Instruments LM2852YMXAX-1.3/NOPB
- Part No.:
- LM2852YMXAX-1.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2852YMXAX-1.3/NOPB.pdf
- Description:
- IC REG BUCK 1.3V 2A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,551
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Product details
Overview
LM2852YMXAX-1.3/NOPB from Texas Instruments is a 2A synchronous buck regulator with fixed 1.3V output, 500 kHz switching frequency, 2.85–5.5V input range, internal 60-mΩ MOSFETs, and voltage-mode control. It delivers point-of-load power to FPGA/DSP core rails in space-constrained industrial and networking equipment.
For engineers reviewing the LM2852YMXAX-1.3/NOPB datasheet, LM2852YMXAX-1.3/NOPB pinout, LM2852YMXAX-1.3/NOPB application, or LM2852YMXAX-1.3/NOPB equivalent, key selection criteria include output voltage accuracy (±2.25% over temperature), thermal performance (RθJA = 39.2°C/W), soft-start programmability (1–50 nF), and HTSSOP-14 package compatibility with high-density PCB layouts.
Technical Context
The LM2852YMXAX-1.3/NOPB implements voltage-mode PWM control with integrated type-three compensation, eliminating external compensation components. Its split-rail architecture separates AVIN (logic bias) from PVIN (power FET supply), enabling optimized efficiency across input voltages while maintaining stable regulation under transient load steps up to 2A.
Switch node protection logic disables PWM during no-load or light-load conditions to prevent erratic behavior, resuming normal operation only when load current exceeds threshold. Internal UVLO (2.85V rising) and thermal shutdown (165°C with 10°C hysteresis) ensure robust operation in unregulated or thermally stressed environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.3 V ±2.25% (–40°C to 125°C), factory-programmed EEPROM setting |
| Max Output Current | 2 A continuous; peak current limit 2.25–3.65 A ensures safe startup into capacitive loads |
| Input Voltage Range | 2.85 V to 5.5 V on AVIN; PVIN ≤ AVIN, supporting dual-rail operation for optimal efficiency |
| Switching Frequency | 500 kHz ±37.5% (–40°C to 125°C); enables compact magnetics and low EMI in mid-frequency band |
| Efficiency | Up to 94% at 2.5VOUT/3.3VIN/1A; 90% typical at 1.3VOUT/3.3VIN/1A per test data |
| Quiescent Current | 0.85 mA (non-switching, TJ = 25°C); 10 µA shutdown current minimizes battery drain in standby |
| Thermal Resistance | RθJA = 39.2°C/W (HTSSOP-14); RθJC(bot) = 1.7°C/W enables direct heatsinking via exposed pad |
Pinout & Package
LM2852YMXAX-1.3/NOPB uses a 14-pin HTSSOP package (5.00 mm × 4.40 mm) with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVIN (Pin 1) | Chip bias supply | Powers internal logic; must be ≥2.85V and ≥PVIN; decoupling critical for noise immunity |
| EN (Pin 2) | Enable control | Internally pulled up; tie to GND to disable; 75% AVIN threshold ensures clean startup sequencing |
| SGND (Pin 3) | Signal ground reference | Separate from PGND to minimize noise coupling into feedback path; connects to SNS divider ground |
| SS (Pin 4) | Soft-start timing | RC-controlled ramp; 2.7 nF yields ~3 ms startup; restricts capacitor range to 1–50 nF for stability |
| NC (Pins 5, 12, 13) | No-connect | Must be left floating or tied to GND; no internal connection; avoids parasitic coupling |
| PVIN (Pins 6, 7) | Power FET supply | Drives high-side/low-side MOSFETs; requires low-ESR bulk capacitance placed adjacent to pins |
| SNS (Pin 14) | Output voltage sense | High-impedance feedback node; connect directly to load for accurate regulation; avoid routing near SW |
| PGND (Pins 10, 11) | Power ground return | Carries high di/dt switch currents; must connect to large copper pour separate from SGND plane |
| SW (Pins 8, 9) | Switch node | Connects to inductor; high dv/dt node requiring minimal trace area to reduce EMI and ringing |
Key Features
| Feature | Design Value |
|---|---|
| Internal Type-Three Compensation | Eliminates external compensation network; ensures stable loop response with recommended L/C/ESR ranges |
| Split-Rail Operation (AVIN/PVIN) | Enables independent optimization of logic supply (AVIN) and power stage (PVIN), improving efficiency at low VIN |
| Switch Node Protection Logic | Prevents false triggering during no-load startup by disabling PWM until load current exceeds detection threshold |
| Factory-Programmed Output Voltage | 1.3 V set permanently in EEPROM; eliminates external resistor dividers and associated tolerance errors |
| Exposed-Pad HTSSOP-14 Package | Reduces junction-to-board thermal resistance to 20.1°C/W, enabling 2A operation without forced air cooling |
Applications
| Baseband Processor Core Supply | FPGA I/O Bank Regulation |
|---|---|
Use Scenario: Powering ARM-based baseband processors in 4G/LTE small cells where input is 3.3V rail and core voltage must be tightly regulated 1.3V. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering 2A continuous current with <1% load regulation error across –40°C to 85°C ambient. Use Value: Factory-set 1.3V eliminates BOM cost and layout area for feedback resistors; 500 kHz switching allows use of 10–15 µH shielded inductors with low profile. | Use Scenario: Regulating I/O banks of Xilinx Artix-7 FPGAs in industrial gateways, where multiple voltage domains require independent, low-noise supplies. IC Role / Device Role / Timing Role: Dedicated point-of-load regulator with soft-start control to prevent inrush current during FPGA configuration. Use Value: SS pin programmability (2.7 nF) ensures controlled 3 ms ramp, avoiding configuration failures due to undershoot on I/O rails. |
| Optical Transceiver Bias Supply | Industrial PLC Digital I/O Module |
Use Scenario: Providing stable 1.3V bias to laser driver ICs in SFP+ optical modules operating from 3.3V backplane supply. IC Role / Device Role / Timing Role: High-efficiency buck converter with low output ripple (<10 mVpp) to minimize jitter in analog laser bias paths. Use Value: 90%+ efficiency at 1A reduces thermal load in sealed transceiver housings; HTSSOP-14 footprint fits tight 12 mm × 9 mm module constraints. | Use Scenario: Powering isolated digital I/O ASICs in DIN-rail mounted PLCs where wide input range (3.3–5V) accommodates varying field power sources. IC Role / Device Role / Timing Role: Robust local regulator with UVLO (2.85V) and thermal shutdown (165°C) for unattended operation in harsh environments. Use Value: Internal 60-mΩ MOSFETs eliminate discrete switch losses; RθJA = 39.2°C/W supports 2A output at 70°C ambient without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 1.3V fixed output, 3 MHz switching, 0.6–6V input, 0.6A max current, 1.2mm × 0.8mm DSBGA | Lower current rating limits use to sub-1A loads; higher frequency enables smaller passives but increases EMI filtering complexity | Select when board space is critical and load current ≤0.6A; not suitable for 2A FPGA core rails |
| MP2122GJ-Z | 1.3V fixed output, 2A capability, 2.5–6V input, 1.5 MHz, 8-pin TSOT23, no internal compensation | Requires external compensation network and higher gate-drive capability; lacks soft-start pin and split-rail support | Choose for cost-sensitive designs accepting added design effort; avoid where AVIN/PVIN separation or controlled startup is required |
Compared with TPS62231DRYT and MP2122GJ-Z, the LM2852YMXAX-1.3/NOPB provides full 2A capability with integrated compensation, soft-start control, and split-rail operation-making it uniquely suited for thermally constrained, high-reliability 1.3V core supplies where layout simplicity and startup predictability are essential.
Availability
LM2852YMXAX-1.3/NOPB is available at Aetrix Electronics and suitable for FPGA core power, industrial PLC I/O modules, and optical transceiver biasing requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM2852YMXAX-1.3/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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability power conversion.
The LM2852 product line delivers highly integrated synchronous buck regulators targeting space-constrained, thermally demanding point-of-load applications in communications infrastructure, industrial automation, and portable computing systems.
FAQ
What is the output voltage tolerance of the LM2852YMXAX-1.3/NOPB over temperature?
The LM2852YMXAX-1.3/NOPB has a factory-programmed 1.3V output with ±2.25% tolerance across the full operating junction temperature range of –40°C to 125°C. This specification is verified per TI's electrical characteristics table and reflects worst-case deviation including line, load, and temperature effects. The LM2852YMXAX-1.3/NOPB does not require external feedback resistors, so this tolerance excludes resistor drift errors common in adjustable regulators.
Can the LM2852YMXAX-1.3/NOPB operate with different input voltages on AVIN and PVIN?
Yes, the LM2852YMXAX-1.3/NOPB supports true split-rail operation: AVIN powers the control logic (2.85–5.5V), while PVIN supplies the power FETs (≤AVIN, 2.85–5.5V). This allows optimizing AVIN for low-noise logic supply and PVIN for efficient power conversion-e.g., AVIN = 3.3V, PVIN = 5V. The LM2852YMXAX-1.3/NOPB datasheet explicitly defines this architecture in Section 7.3.1.
What soft-start capacitor value is recommended for the LM2852YMXAX-1.3/NOPB?
A 2.7 nF ceramic capacitor is the standard recommendation for the LM2852YMXAX-1.3/NOPB soft-start pin (SS), yielding approximately 3 ms startup time. The device's internal 400 kΩ soft-start resistor and 20 pF node capacitance define the RC time constant; 2.7 nF extends this to meet typical system sequencing requirements. The LM2852YMXAX-1.3/NOPB supports 1–50 nF, but values outside 2.2–3.3 nF may cause excessive delay or insufficient inrush limiting.
Does the LM2852YMXAX-1.3/NOPB require external compensation components?
No, the LM2852YMXAX-1.3/NOPB integrates a complete type-three compensation network, eliminating the need for external capacitors or resistors in the feedback loop. This is confirmed in the "Features" section and Section 7.3.4 of the datasheet. However, output filter component values (inductor, capacitor, ESR) must stay within the ranges specified in Table 1 to maintain phase margin and stability-deviations risk oscillation or poor transient response.
What is the thermal performance of the LM2852YMXAX-1.3/NOPB in its HTSSOP-14 package?
The LM2852YMXAX-1.3/NOPB in HTSSOP-14 achieves RθJA = 39.2°C/W (junction-to-ambient) and RθJC(bot) = 1.7°C/W (junction-to-case bottom) when the exposed pad is soldered to a 1-in² 2-oz copper plane. This enables full 2A operation at 70°C ambient without forced airflow. Thermal metrics are measured per JEDEC JESD51 standards and published in Section 6.4 of the LM2852YMXAX-1.3/NOPB datasheet.
LM2852YMXAX-1.3/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:
- 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):
- 1.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM2852YMXAX-1.3/NOPB FAQ
1.How can I place an order for LM2852YMXAX-1.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2852YMXAX-1.3/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 LM2852YMXAX-1.3/NOPB reliable?
The price and inventory of LM2852YMXAX-1.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2852YMXAX-1.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2852YMXAX-1.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2852YMXAX-1.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2852YMXAX-1.3/NOPB?
LM2852YMXAX-1.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2852YMXAX-1.3/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 LM2852YMXAX-1.3/NOPB?
For technical support, including LM2852YMXAX-1.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2852YMXAX-1.3/NOPB requirements.
6.How does Aetrix verify that LM2852YMXAX-1.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2852YMXAX-1.3/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 LM2852YMXAX-1.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2852YMXAX-1.3/NOPB?
All LM2852YMXAX-1.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2852YMXAX-1.3/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 LM2852YMXAX-1.3/NOPB part is unused and in its original packaging.
Return procedure for LM2852YMXAX-1.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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