Texas Instruments LM2832XMYX

Overview

LM2832XMYX from Texas Instruments is a monolithic, high-frequency PWM step-down DC-DC regulator in an 8-pin eMSOP-PowerPAD package, delivering 2.0A output current with 0.6V internal reference and 1.6MHz fixed switching frequency. It integrates a 150mΩ PMOS switch and supports 3.0V–5.5V input to generate precisely regulated 3.3V output for core power in space-constrained embedded systems.

For engineers reviewing the LM2832XMYX datasheet, LM2832XMYX pinout, LM2832XMYX application, or LM2832XMYX equivalent, key selection criteria include verified 1.6MHz operation, thermal shutdown at 165°C, 30nA shutdown current, internal soft-start, and current-mode control enabling fast transient response in USB-powered devices and set-top boxes.

Technical Context

The LM2832XMYX employs current-mode PWM control with internal compensation, supporting duty cycles from 2% to 94% and minimum on-times as low as 30ns. Its architecture includes pulse-by-pulse current limiting (3.25A typ), overvoltage protection (15% above VREF), and undervoltage lockout with 430mV hysteresis.

It features dual supply rails-VIND for power switch and VINA for control circuitry-requiring local connection on PCB. The integrated 0.6V ±2% reference and FB pin enable precise output regulation via external resistor divider, while the DAP (Die Attach Pad) provides low-thermal-impedance grounding without serving as primary GND path.

Key Specifications

Pinout & Package

LM2832XMYX uses the 8-pin eMSOP-PowerPAD package (4.9 mm × 6.0 mm × 1.0 mm), featuring an exposed die attach pad (DAP) soldered to PCB ground for enhanced thermal performance. The package is RoHS-compliant and rated for −40°C to +125°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2832XMYX, LM2833XMYX trades output current for higher frequency and smaller passive size, while TPS62231DRVR offers superior light-load efficiency in a smaller footprint but cannot support the 2.0A load requirement of the original design.

Availability

LM2832XMYX is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, HDD controller boards, and portable instrumentation requiring stable component supply with industrial temperature range support.

Supply support for LM2832XMYX 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 technologies, with decades of expertise in high-efficiency DC-DC conversion.

The LM2832 product line delivers monolithic, high-frequency buck regulators optimized for space-constrained, high-current applications in consumer, computing, and industrial electronics-designed to replace discrete buck solutions with minimal external components.

FAQ

What is the exact switching frequency of LM2832XMYX and how is it set?

The LM2832XMYX has a fixed internal switching frequency of 1.6 MHz, confirmed in the Electrical Characteristics table (FSW = 1.2–1.95 MHz, typ 1.6 MHz). This frequency is factory-trimmed and not user-adjustable-no external resistor or capacitor is required. It enables use of small 1.0–2.2 µH inductors and 22 µF ceramic output capacitors, reducing solution size versus lower-frequency alternatives. The LM2832XMYX variant is specifically designated for 1.6 MHz operation per TI's SNVS455A datasheet revision.

Does LM2832XMYX require external compensation components?

No, LM2832XMYX does not require external compensation components. It features fully internal compensation optimized for stability with standard ceramic output capacitors (≥22 µF, X7R/X5R). The current-mode control architecture and built-in error amplifier compensation eliminate the need for external RC networks or type-II/type-III compensators-reducing BOM count and layout complexity. This is explicitly stated in the Applications Information section of the TI datasheet.

What is the maximum output current LM2832XMYX can sustain continuously?

LM2832XMYX is rated for 2.0 A continuous output current under specified thermal conditions: ambient temperature ≤65°C, 4-layer PCB with 2 oz copper, and proper thermal vias under the DAP. At 5V input → 3.3V output, typical efficiency is 88%, resulting in ~753 mW total power loss. Junction temperature must remain ≤125°C (operating limit); thermal shutdown activates at 165°C. Derating is required above 65°C ambient or with inadequate PCB copper.

Can LM2832XMYX operate with a 3.3V input to generate 1.8V output?

Yes, LM2832XMYX supports 3.3V input to 1.8V output. Its input range is 3.0V–5.5V and output range is 0.6V–4.5V, making 1.8V well within specification. At VIN = 3.3V and VOUT = 1.8V, the duty cycle is ~55%, remaining within the 2%–94% operational window. Efficiency remains high (>90% typical), and the 1.6MHz switching frequency ensures stable regulation with standard 1.5 µH inductors and 22 µF ceramic capacitors per TI's typical application data.

What is the purpose of the separate VINA and VIND pins on LM2832XMYX?

VINA supplies bias power to the internal control circuitry (error amplifier, oscillator, logic), while VIND powers the high-current PMOS switch. They must be connected together on the PCB per TI's recommendation to ensure consistent voltage levels and minimize noise coupling into sensitive analog blocks. Separating them allows independent decoupling-VINA requires a low-ESL 0.1 µF ceramic cap close to the pin, while VIND needs ≥22 µF bulk capacitance-to improve PSRR and transient response without compromising switch efficiency.