Analog Devices Inc. LT8610ABIMSE-5#PBF

Overview

LT8610ABIMSE-5#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current, 30ns minimum on-time, fixed 5V output, and AEC-Q100 qualification for automotive power supplies. It operates across 3.4V–42V input, delivers low-noise regulation in Burst Mode, and integrates internal feedback resistors (12.5MΩ) for simplified design in infotainment and ADAS modules.

For engineers reviewing the LT8610ABIMSE-5#PBF datasheet, LT8610ABIMSE-5#PBF pinout, LT8610ABIMSE-5#PBF application, or LT8610ABIMSE-5#PBF equivalent, key selection criteria include ultralow IQ at light load, 5V fixed-output accuracy (±0.6%), EMI-optimized switching, and thermal performance in the 16-lead MSOP package with exposed pad.

Technical Context

The LT8610ABIMSE-5#PBF uses constant-frequency current-mode control with RT-programmable switching (200kHz–2.2MHz), frequency foldback during start-up/overload, and integrated top/bottom NMOS switches (120mΩ/65mΩ). Its Burst Mode architecture dynamically disables circuitry between pulses to sustain 2.5µA IQ while regulating 12VIN to 5VOUT.

It features dual supply paths: BIAS pin sourcing >3.1V powers INTVCC internally, reducing VIN current draw; EN/UV provides accurate 1V threshold shutdown; PG flag signals ±9% VOUT regulation status and fault conditions; TR/SS enables soft-start ramp control via external capacitor.

Key Specifications

Pinout & Package

Package: 16-lead plastic MSOP with exposed thermal pad (Pin 17 = GND), θ_JA = 40°C/W, θ_JC(PAD) = 10°C/W. Exposed pad must be soldered to PCB for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT8610AIMSE-5#PBF, the LT8610ABIMSE-5#PBF delivers 9% higher light-load efficiency at the cost of slightly increased output ripple-ideal for battery-backed systems. Versus MPQ4420AGL-AEC1-Z, it offers 75% higher current capability, advanced control features (SYNC/TR/SS), and superior thermal performance in the MSOP package.

Availability

LT8610ABIMSE-5#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial gateway applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for LT8610ABIMSE-5#PBF 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 precision instrumentation, industrial automation, and automotive markets.

The LT8610A/LT8610AB series was designed specifically for automotive and industrial DC/DC conversion where ultralow quiescent current, high input voltage tolerance, and AEC-Q100 reliability are mandatory.

FAQ

What is the guaranteed output voltage accuracy of the LT8610ABIMSE-5#PBF over temperature and line?

The LT8610ABIMSE-5#PBF delivers 5.00V output with ±0.6% accuracy over the full –40°C to +125°C junction temperature range and 6V–42V input voltage range, as specified in the Electrical Characteristics table under "Output Voltage (LT8610A-5/LT8610AB-5)" with load current of 0.5A. This accuracy is achieved using laser-trimmed internal 12.5MΩ feedback resistors, eliminating external resistor tolerance and drift errors that affect discrete solutions.

How does the BIAS pin improve efficiency in the LT8610ABIMSE-5#PBF?

The BIAS pin on the LT8610ABIMSE-5#PBF allows the internal 3.4V regulator (INTVCC) to draw current from the 5V output rail instead of VIN when biased above 3.1V. In a typical 12VIN→5VOUT application delivering 2A, this reduces total input current by ~9mA, increasing full-load efficiency by up to 1.2% and lowering thermal stress on the input stage. The LT8610ABIMSE-5#PBF datasheet specifies 9mA BIAS pin current at 1A load and 2MHz switching.

Can the LT8610ABIMSE-5#PBF synchronize to an external clock, and what are the voltage thresholds?

Yes, the LT8610ABIMSE-5#PBF supports external clock synchronization via the SYNC pin (Pin 1). The SYNC pin accepts logic-level inputs with falling threshold of 0.8V–1.4V and rising threshold of 1.6V–2.4V. When driven by a clean CMOS clock, the LT8610ABIMSE-5#PBF aligns its switching edges to the external signal, enabling deterministic EMI reduction in multi-rail systems. Do not float the SYNC pin-it must be actively driven or grounded.

What is the minimum recommended output capacitance for stable operation of the LT8610ABIMSE-5#PBF at 3.5A?

The LT8610ABIMSE-5#PBF requires a minimum of 47µF total output capacitance for stable 3.5A operation, as validated in the Typical Application schematic (TA01a) and Transient Response figures (G34/G35). This value assumes low-ESR ceramic or polymer capacitors placed close to the VOUT and GND pins. Using less than 47µF may cause excessive output voltage deviation (>±5%) during 3.5A load steps and degrade Burst Mode ripple performance-especially critical for the LT8610AB variant's higher light-load ripple.

Does the LT8610ABIMSE-5#PBF include overtemperature protection, and how does it behave?

Yes, the LT8610ABIMSE-5#PBF includes thermal shutdown protection that activates when junction temperature exceeds +165°C (typical). Upon activation, the LT8610ABIMSE-5#PBF halts switching and pulls PG low; it remains latched off until temperature falls below +150°C (hysteresis ~15°C). During sustained overload, junction temperature may exceed +150°C temporarily-this is expected behavior per the datasheet Note 3-and does not indicate device failure if duration is brief and average power remains within SOA limits.