Texas Instruments LM2852YMXA-1.2

Overview

LM2852YMXA-1.2 from Texas Instruments is a 2A synchronous buck regulator with factory-set 1.2 V output, 500 kHz switching frequency, input voltage range of 2.85 V to 5.5 V, internal 60 mΩ MOSFETs, and voltage-mode control. It delivers precise point-of-load regulation for FPGA core supplies in portable computing and networking infrastructure.

For engineers reviewing the LM2852YMXA-1.2 datasheet, LM2852YMXA-1.2 pinout, LM2852YMXA-1.2 application, or LM2852YMXA-1.2 equivalent, key selection criteria include output accuracy (±2.7% over temperature), thermal performance (R_θJA = 39.2°C/W), soft-start programmability (1–50 nF), and HTSSOP-14 package compatibility with high-density PCB layouts.

Technical Context

The LM2852YMXA-1.2 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 ranges while maintaining stable regulation under dynamic load transients up to 2 A.

Switch node protection logic prevents shoot-through during startup or light-load conditions, and internal UVLO (2.85 V rising threshold) ensures reliable power sequencing. The device operates with fixed 1.2 V output set via factory EEPROM-no external feedback resistors required-and supports soft-start timing via external capacitor on SS pin (typical 2.7 nF for ~3 ms ramp).

Key Specifications

Pinout & Package

LM2852YMXA-1.2 uses the 14-pin HTSSOP package (5.00 mm × 4.40 mm) with exposed thermal pad soldered to PCB ground for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with TPS62231DRVR and LM2678SD-1.2/NOPB, LM2852YMXA-1.2 uniquely balances 2 A capability, 500 kHz operation, and factory-set 1.2 V in a thermally enhanced HTSSOP package-making it optimal for compact, medium-power digital core supplies where layout simplicity and thermal headroom are critical.

Availability

LM2852YMXA-1.2 is available at Aetrix Electronics and suitable for FPGA core power, portable computing power rails, and broadband networking point-of-load regulation requiring stable component supply and long-term production continuity.

Supply support for LM2852YMXA-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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The LM2852 product line delivers highly integrated synchronous buck regulators targeting space-constrained, thermally demanding digital core supplies in portable and infrastructure equipment.

FAQ

What is the output voltage tolerance of LM2852YMXA-1.2 over temperature?

The LM2852YMXA-1.2 has a guaranteed output voltage tolerance of ±2.7% across –40°C to 125°C junction temperature, corresponding to 1.166 V to 1.234 V at 25°C nominal. This specification is ensured by factory EEPROM calibration and applies under recommended operating conditions with proper PCB layout and component selection per TI's design guidelines for the LM2852YMXA-1.2.

Does LM2852YMXA-1.2 require external feedback resistors?

No, LM2852YMXA-1.2 does not require external feedback resistors. Its 1.2 V output is factory-programmed into internal EEPROM, eliminating resistor matching errors and layout sensitivity. The SNS pin serves only as a high-impedance sense input routed directly to the load, and no resistor divider is connected-unlike adjustable buck regulators. This simplifies design and improves long-term stability for the LM2852YMXA-1.2.

What is the minimum soft-start capacitor value supported by LM2852YMXA-1.2?

The LM2852YMXA-1.2 supports a minimum soft-start capacitor value of 1 nF on the SS pin, as specified in the datasheet's "Soft-Start Capacitor (CSS) and Fault Conditions" section. Values below 1 nF may cause uncontrolled startup behavior or current-limit activation. A typical 2.7 nF ceramic capacitor yields ~3 ms startup time, and the maximum allowed value is 50 nF to maintain proper fault recovery timing for the LM2852YMXA-1.2.

Can LM2852YMXA-1.2 operate with PVIN lower than AVIN?

Yes, LM2852YMXA-1.2 is explicitly designed for split-rail operation where PVIN must be ≤ AVIN. The datasheet states "PVIN must always be equal to or less than AVIN." For example, AVIN can be 5 V (for logic bias) while PVIN is 3.3 V (for power FETs), enabling optimized efficiency and noise isolation. Operating with PVIN > AVIN violates absolute maximum ratings and may damage the LM2852YMXA-1.2.

What thermal derating applies to LM2852YMXA-1.2 at 125°C ambient?

At 125°C ambient, the LM2852YMXA-1.2 must be thermally derated due to its R_θJA of 39.2°C/W. With a maximum junction temperature of 150°C, the allowable power dissipation drops to (150 − 125)/39.2 ≈ 0.64 W. Given typical conduction and switching losses at 2 A, this implies reduced load current or enhanced PCB copper area is required. Refer to the thermal information table in the LM2852YMXA-1.2 datasheet for R_θJC and ψJB values to guide heatsinking.