Texas Instruments LM2852XMXAX-1.5/NOPB

Overview

LM2852XMXAX-1.5/NOPB from Texas Instruments is a 2A synchronous buck regulator with fixed 1.5V output, 1.5MHz switching frequency, input voltage range of 2.85V–5.5V, internal 60mΩ PFET/NFET switches, and voltage-mode control. It delivers point-of-load power to FPGA core rails in portable computing systems with high efficiency at light loads.

For engineers reviewing the LM2852XMXAX-1.5/NOPB datasheet, LM2852XMXAX-1.5/NOPB pinout, LM2852XMXAX-1.5/NOPB application, or LM2852XMXAX-1.5/NOPB equivalent, key selection criteria include 1.5MHz operation for compact filter design, factory-programmed 1.5V output tolerance (±2.25%), HTSSOP-14 thermal performance (R_θJA = 39.2°C/W), and split-rail AVIN/PVIN capability.

Technical Context

The LM2852XMXAX-1.5/NOPB implements voltage-mode PWM control with internal type-three compensation, eliminating external compensation components. Its dedicated AVIN rail powers control logic while PVIN supplies the integrated 60mΩ PFET/NFET power stage - enabling independent optimization of bias and power paths.

Switch node protection monitors SW voltage to prevent shoot-through during startup or fault conditions, and soft-start is controlled via an external capacitor (1–50nF) on SS pin, with internal 400kΩ pullup resistor defining ramp time. Thermal shutdown activates at 165°C with 10°C hysteresis.

Key Specifications

Pinout & Package

LM2852XMXAX-1.5/NOPB uses a 14-pin HTSSOP package (5.00mm × 4.40mm) with exposed thermal pad connected to PGND. The package supports high-power density layouts and requires solder paste stencil design per TI SNOA401.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2852YMXAX-1.5/NOPB, the LM2852XMXAX-1.5/NOPB reduces inductor size by 5× and improves light-load efficiency by 3–5 percentage points; versus TPS62231DRVR, it provides double the current rating and critical design flexibility via separate AVIN/PVIN rails and adjustable soft-start.

Availability

LM2852XMXAX-1.5/NOPB is available at Aetrix Electronics and suitable for portable computing, FPGA power management, and DSL router applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LM2852XMXAX-1.5/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 consumer markets.

The LM2852 product line delivers high-frequency synchronous buck regulation for space-constrained point-of-load applications, emphasizing integration (internal compensation, MOSFETs), thermal efficiency (exposed-pad HTSSOP), and design simplicity (fixed-output variants).

FAQ

What is the guaranteed output voltage accuracy of the LM2852XMXAX-1.5/NOPB over temperature?

The LM2852XMXAX-1.5/NOPB guarantees output voltage within ±2.25% (±0.03375V) of 1.5V across the full –40°C to 125°C junction temperature range, as specified in the Electrical Characteristics table under VOUT tolerance for the 1.5V option. This accuracy is factory-trimmed and does not require external calibration. The LM2852XMXAX-1.5/NOPB achieves this using laser-trimmed internal DAC and precision feedback resistors.

Can the LM2852XMXAX-1.5/NOPB operate with AVIN and PVIN supplied from different sources?

Yes, the LM2852XMXAX-1.5/NOPB supports true split-rail operation: AVIN (pin 1) powers the control logic and must be ≥2.85V, while PVIN (pins 6,7) supplies the power FETs and must be ≤AVIN and ≥1.5V. This allows optimizing AVIN for low-noise logic supply and PVIN for higher-efficiency power conversion. The LM2852XMXAX-1.5/NOPB datasheet explicitly defines this architecture in Section 7.3.1.

What is the minimum soft-start capacitor value supported for the LM2852XMXAX-1.5/NOPB?

The LM2852XMXAX-1.5/NOPB supports soft-start capacitors from 1nF to 50nF on the SS pin (pin 4), as confirmed in Section 8.2.2.3 of the datasheet. A 1nF capacitor yields ~300µs startup time; typical designs use 2.7nF for ~3ms ramp. Values below 1nF risk uncontrolled inrush current and potential current-limit activation during startup. The LM2852XMXAX-1.5/NOPB internal 400kΩ resistor sets the RC time constant.

Does the LM2852XMXAX-1.5/NOPB require external compensation components?

No, the LM2852XMXAX-1.5/NOPB integrates a complete type-three compensation network internally, eliminating all external compensation components. This is confirmed in the Features list ("Internal Type-Three Compensation") and Section 7.3. This integration reduces BOM count and layout sensitivity while maintaining stability across the recommended output capacitor (68–220µF) and inductor (1–22µH) ranges specified in Table 1.

What thermal performance can be expected from the LM2852XMXAX-1.5/NOPB in a standard 2-layer PCB layout?

In a standard 2-layer PCB with the exposed thermal pad soldered to a 1-in² internal ground plane, the LM2852XMXAX-1.5/NOPB achieves R_θJA = 39.2°C/W (Section 6.4). At 2A load and 5V input, typical power dissipation is ~0.3W, resulting in ~12°C junction-to-ambient rise - well within the 125°C max junction limit. The LM2852XMXAX-1.5/NOPB R_θJC(bot) = 1.7°C/W enables further cooling via heatsinking to the PCB ground plane.