Texas Instruments LM2852YMXAX-1.2

Overview

LM2852YMXAX-1.2 from Texas Instruments is a 2A synchronous buck regulator with fixed 1.2V output, 500kHz switching frequency, and input voltage range of 2.85V to 5.5V. It integrates internal 60mΩ PMOS/NMOS switches, voltage-mode control, and on-chip type-three compensation - enabling compact point-of-load regulation for FPGA core supplies.

For engineers reviewing the LM2852YMXAX-1.2 datasheet, LM2852YMXAX-1.2 pinout, LM2852YMXAX-1.2 application, or LM2852YMXAX-1.2 equivalent, key selection criteria include its factory-programmed 1.2V output, HTSSOP-14 thermal performance, soft-start capacitor interface (CSS), and compatibility with ceramic output capacitors down to 68µF at ≤275mΩ ESR.

Technical Context

The LM2852YMXAX-1.2 implements voltage-mode PWM control with internal oscillator set to 500kHz (±25% over temperature), delivering regulated 1.2V ±2.7% output across −40°C to +125°C junction range. Its integrated power stage uses complementary 60mΩ MOSFETs (rDSON-P max 140mΩ, rDSON-N max 120mΩ) and supports duty cycle range of 0–100%.

Startup is controlled via external soft-start capacitor (CSS = 2.7nF typical) connected to pin 4, with internal 400kΩ pullup enabling precise 3ms ramp time. The device features UVLO with 2.47V rising threshold and 85mV hysteresis, plus thermal shutdown at 165°C with 10°C hysteresis.

Key Specifications

Pinout & Package

LM2852YMXAX-1.2 is housed in a 14-pin HTSSOP package (PWP0014A) with exposed thermal pad. The package enables high-power density and low thermal impedance when the pad is soldered to a solid ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2852YMXA-1.2 and TPS62231DRVR, the LM2852YMXAX-1.2 delivers full 2A capability in a thermally robust HTSSOP package with proven stability using standard 68–100µF ceramic output capacitors - making it optimal for FPGA/DSP core rails where current, thermal margin, and layout simplicity are critical.

Availability

LM2852YMXAX-1.2 is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, and broadband networking PHY applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for LM2852YMXAX-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, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC-DC conversion.

The LM2852 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in cost-sensitive, space-constrained power designs requiring minimal external components and predictable performance.

FAQ

What is the output voltage tolerance of the LM2852YMXAX-1.2 over temperature and load?

The LM2852YMXAX-1.2 delivers 1.2V output with ±2.7% tolerance across −40°C to +125°C junction temperature and 0–2A load range. This specification is ensured per Electrical Characteristics table in SNVS325D, measured at the SNS pin in closed-loop configuration - guaranteeing stable core voltage for sensitive digital ICs without external trimming.

Can the LM2852YMXAX-1.2 operate with PVIN lower than AVIN?

Yes - the LM2852YMXAX-1.2 supports split-rail operation where PVIN (power FET supply) may be lower than AVIN (logic bias supply), as long as PVIN ≥1.5V and ≤AVIN. This allows optimization of power loss in the PMOS switch while maintaining robust logic operation, especially useful in multi-rail systems with dedicated 3.3V logic and 2.5V power domains.

What is the recommended soft-start capacitor value for the LM2852YMXAX-1.2?

The recommended soft-start capacitor for LM2852YMXAX-1.2 is 2.7nF (e.g., Vishay VJ0805Y272KXXA), connected between SS (pin 4) and SGND. This yields ~3ms output ramp time, preventing inrush current that could trigger upstream current limits. CSS values must stay within 1–50nF per datasheet Section 8.2.2 to ensure proper fault recovery behavior.

Does the LM2852YMXAX-1.2 require external compensation components?

No - the LM2852YMXAX-1.2 integrates a complete type-three compensation network on-die. No external capacitors or resistors are needed for loop stability. However, output filter component selection (inductor L, capacitor C, and ESR) must follow Table 1 in SNVS325D to maintain ≥45° phase margin - e.g., 10–15µH inductor and 68–100µF ceramic capacitor with 95–275mΩ ESR for 1.2V output at 500kHz.

What thermal performance can be expected from the LM2852YMXAX-1.2 in a standard 4-layer PCB?

With the exposed thermal pad fully soldered to an internal 1-in² copper pour connected to ground planes on all layers, the LM2852YMXAX-1.2 achieves θJA = 38°C/W. At 2A load and 3.3V input, power dissipation is ~0.32W - resulting in ~12°C junction-to-ambient rise above 85°C ambient, well below the 125°C max operating junction temperature specified in SNVS325D.