Texas Instruments LM2852YMXAX-1.8/NOPB

Overview

LM2852YMXAX-1.8/NOPB from Texas Instruments is a 2A synchronous buck regulator with fixed 1.8 V output, 500 kHz switching frequency, input voltage range of 2.85 V to 5.5 V, and internal 60 mΩ MOSFETs. It delivers point-of-load regulation for FPGA core supplies in portable computing and networking infrastructure.

For engineers reviewing the LM2852YMXAX-1.8/NOPB datasheet, LM2852YMXAX-1.8/NOPB pinout, LM2852YMXAX-1.8/NOPB application, or LM2852YMXAX-1.8/NOPB equivalent, key selection criteria include output voltage accuracy (±2.03% at 1.8 V), thermal performance (R_θJA = 39.2 °C/W), soft-start control via external capacitor, and HTSSOP-14 package compatibility with high-density PCB layouts.

Technical Context

The LM2852YMXAX-1.8/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 ranges.

Switch node protection prevents device damage during light-load or no-load startup by disabling switching until load current exceeds threshold. Internal UVLO triggers at 2.85 V (rising) with 85–210 mV hysteresis, ensuring reliable power sequencing in multi-rail systems.

Key Specifications

Pinout & Package

LM2852YMXAX-1.8/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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRYT and MP2143GJ-Z, LM2852YMXAX-1.8/NOPB provides guaranteed 1.8-V factory trim, integrated compensation, and HTSSOP thermal performance ideal for sustained 2-A loads-making it optimal for FPGA, DSP, and industrial compute applications where reliability and ease of qualification matter.

Availability

LM2852YMXAX-1.8/NOPB is available at Aetrix Electronics and suitable for FPGA core power, portable computing power rails, and broadband networking PHY interfaces requiring stable component supply and long-term production continuity.

Supply support for LM2852YMXAX-1.8/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.

The LM2852 product line delivers highly integrated synchronous buck regulators targeting space-constrained, thermally demanding point-of-load applications in FPGA, DSP, and ASIC power systems.

FAQ

What is the output voltage tolerance of LM2852YMXAX-1.8/NOPB?

The LM2852YMXAX-1.8/NOPB has a factory-programmed 1.8 V output with a tolerance of ±2.03% (1.7595 V to 1.8405 V) over –40°C to 125°C junction temperature. This specification ensures compliance with 1.8-V I/O standards for FPGAs and processors without requiring external feedback resistors. The LM2852YMXAX-1.8/NOPB achieves this accuracy through laser-trimmed internal DAC and precision bandgap reference.

Does LM2852YMXAX-1.8/NOPB require external compensation components?

No, the LM2852YMXAX-1.8/NOPB integrates a complete type-three compensation network internally, eliminating the need for external resistors or capacitors in the feedback loop. This reduces BOM count and layout complexity while ensuring stable operation with recommended inductor (10–15 µH) and output capacitor (100–120 µF) values. The LM2852YMXAX-1.8/NOPB's internal compensation is optimized for its fixed 1.8 V output and 500 kHz switching frequency.

What is the purpose of the split-rail design (AVIN and PVIN) in LM2852YMXAX-1.8/NOPB?

The split-rail design separates AVIN (logic bias supply) from PVIN (power FET supply), allowing independent optimization: AVIN can be derived from a clean, low-noise 5 V rail while PVIN connects directly to a noisier 3.3 V input source. This improves efficiency and reduces coupling of switching noise into control circuitry. For LM2852YMXAX-1.8/NOPB, PVIN must always be ≤ AVIN, and both must stay within their respective 2.85–5.5 V and 1.5–5.5 V operating ranges.

How does the soft-start function work on LM2852YMXAX-1.8/NOPB?

The LM2852YMXAX-1.8/NOPB uses an internal 400 kΩ resistor charging an external capacitor on the SS pin to control output voltage ramp time. With a 2.7 nF capacitor, the LM2852YMXAX-1.8/NOPB achieves ~3 ms startup (95% of final value), limiting inrush current and preventing output overshoot. The SS pin also interfaces with fault protection circuits-during short-circuit events, the soft-start voltage tracks the falling output to enable graceful restart once the fault clears.

What thermal performance can be expected from LM2852YMXAX-1.8/NOPB in a standard PCB layout?

In a standard 4-layer PCB with 1 oz copper and the HTSSOP-14 exposed pad soldered to a 1-in² internal ground plane, the LM2852YMXAX-1.8/NOPB achieves R_θJA = 39.2 °C/W and R_θJB = 20.1 °C/W. At 2 A load and 3.3 V input, junction temperature rise is ~45°C above ambient-well within the 125°C maximum rating. For sustained 2 A operation at 70°C ambient, no heatsink or airflow is required due to the LM2852YMXAX-1.8/NOPB's low R_θJC(bot) of 1.7 °C/W.