Analog Devices Inc. LT8610ACHMSE-1#PBF

Overview

LT8610ACHMSE-1#PBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 0.8V feedback reference, 3V minimum input voltage, and thermally enhanced 16-lead MSOP package rated for –40°C to 150°C junction temperature. It delivers high efficiency (95% at 1A/5V_OUT from 12V_IN) and fast transient response in automotive power supplies and industrial DC/DC conversion.

For engineers reviewing the LT8610ACHMSE-1#PBF datasheet, LT8610ACHMSE-1#PBF pinout, LT8610ACHMSE-1#PBF application, or LT8610ACHMSE-1#PBF equivalent, key selection criteria include its 1.5MHz–2.2MHz programmable switching frequency range, internal compensation optimized for high-frequency operation, soft-start on dropout recovery, ±8% power-good threshold accuracy, and AEC-Q100 qualification for automotive use.

Technical Context

The LT8610ACHMSE-1#PBF implements constant-frequency current-mode control with an internal 0.8V reference and RT-pin-programmable oscillator. Its architecture integrates top and bottom NMOS power switches (120mΩ/65mΩ), supports external synchronization via SYNC pin, and features frequency foldback during startup or overload.

Unlike the LT8610AC variant, the LT8610ACHMSE-1#PBF uses internal compensation tuned for 1.5–2.2MHz operation and includes a TR/SS pin discharge circuit that regulates TR/SS to FB voltage during dropout recovery-reducing output overshoot and enabling controlled soft-start when exiting brownout conditions.

Key Specifications

Pinout & Package

LT8610ACHMSE-1#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with exposed pad (Pin 17) soldered to PCB ground for θ_JA = 40°C/W and θ_JC(PAD) = 10°C/W. The package supports –40°C to 150°C junction operation and meets AEC-Q100 Grade H requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT8610ACEMSE-1#PBF, the LT8610ACHMSE-1#PBF adds AEC-Q100 qualification and 150°C operation at identical electrical specs; versus LT8640SIV#PBF, it trades higher current and fixed frequency for programmability, synchronization, and automotive-grade robustness.

Availability

LT8610ACHMSE-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, GSM RF bias, and portable medical diagnostics requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for LT8610ACHMSE-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and automotive markets.

The LT8610AC/LT8610AC-1 product line delivers ultralow-I_Q synchronous buck regulators optimized for automotive and industrial applications demanding high efficiency across wide input ranges and extreme temperature operation.

FAQ

What is the maximum junction temperature rating for the LT8610ACHMSE-1#PBF?

The LT8610ACHMSE-1#PBF is guaranteed over the full –40°C to 150°C operating junction temperature range and qualified to AEC-Q100 Grade H. This rating enables deployment in under-hood automotive locations and high-ambient industrial enclosures where thermal derating beyond 125°C is required. Operation above 125°C reduces lifetime and requires thermal design validation per Analog Devices' reliability reports.

How does the LT8610ACHMSE-1#PBF reduce output voltage overshoot during dropout recovery?

The LT8610ACHMSE-1#PBF incorporates a dedicated TR/SS pin discharge circuit that actively pulls the TR/SS node to match the FB voltage during dropout or brownout conditions. When the part exits dropout, this ensures the soft-start ramp begins from the actual output voltage-not from zero-thereby eliminating overshoot. This behavior is unique to the -1 variant and is confirmed in the datasheet's OPERATION section.

Can the LT8610ACHMSE-1#PBF be synchronized to an external clock, and what are the voltage thresholds?

Yes, the LT8610ACHMSE-1#PBF supports external synchronization via the SYNC pin (Pin 1). The falling threshold is 1.1V and rising threshold is 2.0V, with valid input voltage range of 0V to 6V. When synchronized, the device operates in pulse-skipping mode with switching edges aligned to the external clock, disabling frequency foldback except during overcurrent events.

What is the minimum output capacitance required for stable operation of the LT8610ACHMSE-1#PBF?

The LT8610ACHMSE-1#PBF requires a minimum of 47µF total output capacitance for stable operation in Burst Mode at 3.3V/100mA, as validated in Table 1 of the datasheet. Using 47µF ×2 (94µF) reduces output ripple from 40mV to 20mV. Ceramic or polymer capacitors with ≤10mΩ ESR are recommended; tantalum is not advised due to surge current limitations.

Does the LT8610ACHMSE-1#PBF support biasing from the output rail, and what is the minimum V_BIAS voltage?

Yes, the LT8610ACHMSE-1#PBF supports BIAS pin operation: when V_BIAS ≥ 3.1V, internal circuitry draws current from BIAS instead of VIN, improving light-load efficiency. For 3.3V or 5V outputs, BIAS should be connected directly to V_OUT. A 1µF local bypass capacitor is required if BIAS is sourced from a non-V_OUT supply.