Texas Instruments LM2852XMXA-1.2

Overview

LM2852XMXA-1.2 from Texas Instruments is a 2 A synchronous buck DC-DC regulator with factory-set 1.2 V output, 1.5 MHz switching frequency, input voltage range of 2.85–5.5 V, internal 60-mΩ power MOSFETs, and voltage-mode control. It delivers point-of-load regulation for FPGA core supplies in compact portable computing systems.

For engineers reviewing the LM2852XMXA-1.2 datasheet, LM2852XMXA-1.2 pinout, LM2852XMXA-1.2 application, or LM2852XMXA-1.2 equivalent, key selection criteria include 1.5 MHz operation for small external components, 1.2 V ±2.7% output tolerance at 25°C, thermal shutdown at 165°C, and HTSSOP-14 package with exposed pad for enhanced thermal dissipation.

Technical Context

The LM2852XMXA-1.2 implements voltage-mode PWM control with internal type-three compensation, eliminating need for external compensation networks. 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 no-load or light-load conditions by disabling switching until load is applied. The integrated soft-start circuit uses an external capacitor (1–50 nF) to control ramp rate, with typical 3 ms startup time using 2.7 nF.

Key Specifications

Pinout & Package

LM2852XMXA-1.2 is housed in a thermally enhanced 14-pin HTSSOP package (5.00 mm × 4.40 mm) with exposed thermal pad soldered to PCB ground plane for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2852YMXA-1.2 and TPS62231DRVR, LM2852XMXA-1.2 uniquely balances 2 A capability, 1.5 MHz operation, and split-rail flexibility in a thermally optimized package-making it optimal for space-constrained, medium-power digital loads requiring stable 1.2 V rails.

Availability

LM2852XMXA-1.2 is available at Aetrix Electronics and suitable for FPGA core power, USB-powered embedded controllers, portable medical displays, and low-power IoT wireless modules requiring stable component supply and long-term production continuity.

Supply support for LM2852XMXA-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.

The LM2852 product line delivers highly integrated synchronous buck regulators targeting space-constrained, medium-current DC-DC conversion in portable and embedded systems-designed to minimize external component count while maintaining thermal and electrical robustness.

FAQ

What is the output voltage tolerance of LM2852XMXA-1.2 over temperature?

The LM2852XMXA-1.2 has a guaranteed output voltage tolerance of ±2.7% over the full junction temperature range (−40°C to 125°C), with tighter ±1.35% typical variation at 25°C. This specification is factory-trimmed and does not require external feedback resistors, ensuring consistent 1.2 V regulation across thermal and aging conditions in the LM2852XMXA-1.2.

Can LM2852XMXA-1.2 operate with AVIN and PVIN supplied from different sources?

Yes - the LM2852XMXA-1.2 supports true split-rail operation: AVIN powers internal logic (2.85–5.5 V), while PVIN supplies the power FETs (must be ≤ AVIN). This allows optimizing noise isolation and efficiency, e.g., AVIN = 3.3 V (clean LDO) and PVIN = 5 V (noisy buck converter), as explicitly supported in the LM2852XMXA-1.2 datasheet.

What is the minimum soft-start capacitor value allowed for LM2852XMXA-1.2?

The LM2852XMXA-1.2 requires a soft-start capacitor between 1 nF and 50 nF, per TI's datasheet Section 6.5 and 8.2.2.3. Using <1 nF risks uncontrolled inrush current and potential current-limit activation during startup, while >50 nF may violate internal timing constraints. A 2.7 nF capacitor yields ~3 ms controlled ramp, as validated in LM2852XMXA-1.2 reference designs.

Does LM2852XMXA-1.2 include internal compensation?

Yes - the LM2852XMXA-1.2 integrates a complete type-three compensation network, eliminating all external compensation components. This is confirmed in the Functional Block Diagram (Figure 11) and Section 7.3.4 of the datasheet, enabling stable operation with only four external components: CIN, CSS, CO, and LO - a defining feature of the LM2852XMXA-1.2.

What thermal metrics apply to the LM2852XMXA-1.2 HTSSOP-14 package?

The LM2852XMXA-1.2 in HTSSOP-14 (PWP) exhibits RθJA = 39.2°C/W, RθJC(bot) = 1.7°C/W, and RθJB = 20.1°C/W (per Section 6.4). These values assume proper soldering of the exposed thermal pad to a 1-in² 2-oz copper ground plane - critical for achieving the 125°C maximum junction temperature rating in the LM2852XMXA-1.2.