Analog Devices Inc. DC1379A

Overview

LTM8025 from Analog Devices is a 36V input, 3A step-down µModule regulator integrating controller, power switches, inductor, and support components in a single compact package. It delivers regulated output from 0.8V to 24V with selectable switching frequency (200kHz–2.4MHz), current-mode control, and programmable soft-start - enabling robust power delivery for industrial and portable systems requiring high efficiency and minimal external components.

For engineers reviewing the LTM8025 datasheet, LTM8025 pinout, LTM8025 application, or LTM8025 equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world design guidance for automotive battery regulation, distributed supply rails, and wall transformer-derived supplies.

Technical Context

The LTM8025 implements a fixed-frequency current-mode PWM architecture with internal compensation, enabling stable operation across wide input (3.6V–36V) and output (0.8V–24V) ranges. Its integrated inductor and synchronous rectification eliminate external diode losses and reduce EMI.

Thermal performance is managed via bottom-thermal-pad LGA/BGA packages (9mm × 15mm), with θJC(BOTTOM) = 11.5°C/W and junction temperature limit of 125°C. Burst Mode® operation reduces quiescent current to ≤50µA at light loads while maintaining regulation.

Key Specifications

Pinout & Package

The LTM8025 is available in two 70-pin surface-mount packages: thermally enhanced LGA (4.32mm height) and BGA (4.92mm height), both measuring 9mm × 15mm. Both packages feature exposed thermal pads on the bottom for PCB heat sinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTM4625 and LMZ31503, the LTM8025 uniquely combines 3A capability, 36V input, programmable frequency, parallel operation, and Burst Mode - making it optimal for high-reliability, thermally constrained, and multi-rail industrial power designs.

Availability

LTM8025 is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and distributed supply regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant or SnPb finish options.

Supply support for LTM8025 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTM8025 belongs to Analog Devices' µModule regulator family - designed to simplify power system design by integrating all critical components into compact, thermally optimized, and fully tested modules for rapid deployment in demanding environments.

FAQ

What is the minimum input voltage required for the LTM8025 to regulate a 3.3V output at full 3A load?

The minimum input voltage for LTM8025 to sustain 3.3V/3A output is approximately 4.1V, as specified in Table 1 of the datasheet Rev. E. This headroom accounts for internal voltage drops and ensures stable current-mode control. Below this threshold, dropout occurs and regulation is lost - design margin should include worst-case temperature and PCB trace resistance.

Can the LTM8025 be used to generate negative output voltages?

Yes, the LTM8025 supports negative output configurations (e.g., –3.3V, –5V, –12V) using inverted buck-boost topology, as documented in Table 1 of the datasheet Rev. E. Input voltage ranges and component recommendations (CIN, COUT, RADJ) are provided for each negative output; BIAS must still be ≥2.8V and VIN + BIAS ≤56V.

How does the BIAS pin improve efficiency in the LTM8025?

The BIAS pin powers the internal gate drivers and control circuitry. When connected to VOUT ≥2.8V (via AUX or direct), it bypasses the internal VIN-derived bias regulator, reducing conduction losses and improving full-load efficiency by up to 2%. This also lowers thermal stress on the VIN path, especially at high input voltages.

Is the LTM8025 pin-compatible across LGA and BGA package variants?

No - while LTM8025 LGA and BGA share identical pin functions and 70-pin count, their mechanical layouts differ: LGA uses land pads (no solder balls), BGA uses solder spheres. PCB footprints, stencil design, and reflow profiles are not interchangeable; separate layout files are required for each package type.

What thermal derating applies to the LTM8025 at 85°C ambient temperature?

At 85°C ambient, the LTM8025's maximum continuous output current derates to ~2.4A (assuming 2-layer PCB with 2oz copper and 1in² thermal pad). Derating is governed by junction temperature limit (125°C) and θJA = 24.4°C/W; actual capability depends on heatsinking, airflow, and copper area - refer to Figure G31–G36 in datasheet Rev. E for measured thermal rise curves.