Texas Instruments LM2852XMXA-1.5

Overview

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

For engineers reviewing the LM2852XMXA-1.5 datasheet, LM2852XMXA-1.5 pinout, LM2852XMXA-1.5 application, or LM2852XMXA-1.5 equivalent, key selection criteria include its 1.5 MHz high-frequency operation enabling small external inductors (e.g., 1 µH), factory-programmed 1.5 V output with ±1.7% tolerance at 25°C, and integrated type-three compensation eliminating external compensation components.

Technical Context

The LM2852XMXA-1.5 implements voltage-mode PWM control with an internal oscillator set to 1.5 MHz (±18% over temperature), supporting split-rail operation where AVIN powers logic and PVIN powers power FETs. Its internal type-three compensation network ensures stability with recommended ceramic output capacitors (10–100 µF) and low-ESR inductors (1–22 µH).

It features UVLO activation at 2.85 V (rising), thermal shutdown at 165°C with 10°C hysteresis, and peak current limiting at 2.75–4.95 A. The device uses a dedicated SNS pin for remote output voltage sensing and SS pin for soft-start timing via external capacitor (1–50 nF).

Key Specifications

Pinout & Package

LM2852XMXA-1.5 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 synchronous buck regulator applications.

Compared with LM2852YMXA-1.5, the LM2852XMXA-1.5 achieves higher power density via 1.5 MHz operation and eliminates compensation design effort; versus TPS62231DRVR, it trades package size for out-of-the-box stability and simplified qualification.

Availability

LM2852XMXA-1.5 is available at Aetrix Electronics and suitable for FPGA core supplies, portable SSD controllers, 5G baseband power, and other high-reliability embedded applications requiring stable component supply and long-term manufacturability.

Supply support for LM2852XMXA-1.5 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 ICs and broad manufacturing scale.

The LM2852XMXA-1.5 belongs to TI's SIMPLE SWITCHER® synchronous buck regulator family, engineered for rapid, reliable DC-DC conversion in space-constrained, thermally demanding applications like portable computing and communications infrastructure.

FAQ

What is the switching frequency tolerance of the LM2852XMXA-1.5 over temperature and input voltage?

The LM2852XMXA-1.5 has a nominal switching frequency of 1.5 MHz, with variation from 1050 kHz to 1825 kHz across the full operating temperature range (–40°C to 125°C) and input voltage range (2.85 V to 5.5 V). This ±25% tolerance is inherent to its internal oscillator design and must be accounted for in EMI filter sizing and inductor saturation margin calculations. The LM2852XMXA-1.5 does not support external frequency synchronization or trimming.

Can the LM2852XMXA-1.5 operate with PVIN lower than AVIN, and what are the constraints?

Yes - the LM2852XMXA-1.5 supports split-rail operation where PVIN is powered separately from AVIN, provided PVIN ≤ AVIN and PVIN ≥1.5 V. PVIN must always be equal to or less than AVIN to prevent latch-up; for example, AVIN = 5 V and PVIN = 3.3 V is valid, but AVIN = 3.3 V and PVIN = 5 V is not permitted. This configuration isolates power-switch noise from sensitive logic circuits in the LM2852XMXA-1.5.

What is the recommended soft-start capacitor value for the LM2852XMXA-1.5, and how does it affect startup time?

The LM2852XMXA-1.5 recommends a 2.7 nF ceramic capacitor on the SS pin to achieve ~3 ms output ramp time. Startup time scales linearly with capacitance due to the internal 400 kΩ soft-start resistor (t ≈ 3 × R × C). Capacitor values must stay within 1–50 nF per datasheet limits; outside this range, fault recovery behavior or startup reliability may degrade. A 2.7 nF part (e.g., Vishay VJ0805Y272KXXA) is validated in TI reference designs for LM2852XMXA-1.5.

Does the LM2852XMXA-1.5 require external compensation components?

No - the LM2852XMXA-1.5 integrates a complete type-three compensation network internally, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, improves production consistency, and reduces bill-of-materials cost. Stability is guaranteed only when using output filter components within the ranges specified in the datasheet (e.g., 1–22 µH inductors and 10–100 µF ceramic capacitors for the 1.5 MHz version).

How does the SNS pin improve regulation accuracy in the LM2852XMXA-1.5?

The SNS pin on the LM2852XMXA-1.5 provides remote output voltage sensing by connecting directly to the load's power input node, bypassing PCB trace resistance between the regulator and load. This compensates for IR drop in high-current paths, ensuring the load receives precisely 1.5 V even with 200 mΩ of trace resistance. For best results, route the SNS trace away from noisy nodes like SW and use a dedicated pair of vias close to the load.