Texas Instruments LM2853MHX-1.0/NOPB

Overview

LM2853MHX-1.0/NOPB from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator with factory-programmed 1.0-V output, 3 V to 5.5 V input range, internal 40 mΩ/32 mΩ MOSFETs, and voltage-mode control. It delivers precise point-of-load regulation for FPGA core supplies in telecom infrastructure equipment.

For engineers reviewing the LM2853MHX-1.0/NOPB datasheet, LM2853MHX-1.0/NOPB pinout, LM2853MHX-1.0/NOPB application, or LM2853MHX-1.0/NOPB equivalent, this page provides verified technical context, HTSSOP-14 package mapping, soft-start and enable interface details, thermal performance data (R_θJA = 38°C/W), and validated alternatives for 1.0-V DC-DC conversion.

Technical Context

The LM2853MHX-1.0/NOPB implements voltage-mode PWM control with internal type-three compensation, eliminating external compensation components. Its integrated high-side PFET (40 mΩ typical) and low-side NFET (32 mΩ typical) support continuous 3-A output current with <2 mV/A load regulation and ±2.25% output tolerance over –40°C to 125°C.

It features dedicated AVIN (3–5.5 V) and PVIN (1.5–5.5 V) rails for split-rail operation, EN pin with 75% AVIN threshold and 25% AVIN hysteresis, and SNS pin for remote output sensing. Thermal shutdown activates at 165°C with 10°C hysteresis, and UVLO triggers at 2.47 V on AVIN with 50–260 mV hysteresis.

Key Specifications

Pinout & Package

LM2853MHX-1.0/NOPB uses the 14-pin HTSSOP (PWP) package (5.00 mm × 4.40 mm) with exposed thermal pad internally connected to GND. The pad must be soldered to an external ground plane but cannot serve as primary GND connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54302DDCR and MP2332HGRT-Z, LM2853MHX-1.0/NOPB offers factory-trimmed 1.0-V output with no external resistors, dual AVIN/PVIN rails for flexible biasing, and superior thermal performance (38°C/W vs ≥55°C/W), making it optimal for space- and thermally constrained 3–5.5 V systems.

Availability

LM2853MHX-1.0/NOPB is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, and broadband networking infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LM2853MHX-1.0/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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and communications markets.

The LM2853 product line delivers highly integrated synchronous buck regulators with factory-programmed outputs and internal compensation - designed specifically for low-voltage, high-current point-of-load applications in FPGA, ASIC, and DSP systems.

FAQ

What is the output voltage tolerance of LM2853MHX-1.0/NOPB over temperature?

The LM2853MHX-1.0/NOPB has a guaranteed output voltage tolerance of ±2.25% across the full operating junction temperature range of –40°C to 125°C. This specification is measured at the SNS pin under closed-loop conditions and reflects factory programming accuracy plus thermal drift of internal references and MOSFET R_DS(ON). The LM2853MHX-1.0/NOPB achieves this without external feedback resistors.

Can LM2853MHX-1.0/NOPB operate with separate AVIN and PVIN supplies?

Yes, LM2853MHX-1.0/NOPB supports true split-rail operation: AVIN powers the control circuitry (3–5.5 V), while PVIN powers the internal MOSFETs (1.5–5.5 V). PVIN must be ≤ AVIN. This allows efficient use of a 3.3-V AVIN rail and 5-V PVIN rail, reducing control-stage power loss. The LM2853MHX-1.0/NOPB datasheet confirms this configuration in Section 8.1.9.

What is the recommended soft-start capacitor value for LM2853MHX-1.0/NOPB?

The recommended soft-start capacitor for LM2853MHX-1.0/NOPB is 2.2 nF, which yields approximately a 3-ms startup time. This value is derived from the internal 450 kΩ DAC resistor and the requirement for three RC time constants to reach 95% of final output voltage. Capacitor values between 1 nF and 50 nF are supported, but 2.2 nF is validated in TI's Bill of Materials for 1.2-V and 3.3-V variants of the LM2853MHX-1.0/NOPB family.

Does LM2853MHX-1.0/NOPB require external compensation components?

No, LM2853MHX-1.0/NOPB integrates a complete type-three compensation network on-die. This eliminates the need for external capacitors or resistors in the feedback loop, significantly reducing design complexity and PCB area. The internal compensation is optimized for the recommended output filter inductor (4.7–6.8 µH) and capacitor (120–220 µF) ranges specified in the LM2853MHX-1.0/NOPB datasheet Table 1.

What thermal performance can be expected from LM2853MHX-1.0/NOPB in a standard PCB layout?

With the exposed thermal pad of LM2853MHX-1.0/NOPB fully soldered to a 1-in² copper ground plane on a 4-layer PCB, the device achieves a junction-to-ambient thermal resistance (R_θJA) of 38°C/W. This allows continuous 3-A operation at up to 85°C ambient temperature without forced airflow. Layout adherence to TI's guidelines - especially wide PGND traces and direct pad-to-plane soldering - is essential to realize this rating.