Analog Devices Inc. LT8610ACHMSE-1#TRPBF

Overview

LT8610ACHMSE-1#TRPBF from Analog Devices is a 42V, 3.5A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 0.80V feedback reference, 3.0V minimum input voltage, and internal compensation optimized for 1.5MHz–2.2MHz operation. It delivers high efficiency (95% at 1A/5V_OUT from 12V_IN) and low dropout (200mV at 1A) for automotive power supplies and industrial DC/DC conversion.

For engineers reviewing the LT8610ACHMSE-1#TRPBF datasheet, LT8610ACHMSE-1#TRPBF pinout, LT8610ACHMSE-1#TRPBF application, or LT8610ACHMSE-1#TRPBF equivalent, key selection considerations include its AEC-Q100 qualification, –40°C to 150°C junction temperature rating, soft-start on dropout exit, and TR/SS-controlled output tracking-critical for rail sequencing in infotainment and ADAS modules.

Technical Context

The LT8610ACHMSE-1#TRPBF implements constant-frequency current-mode control with internal compensation tuned for high-bandwidth transient response at ≥1.5MHz switching. Its 30ns minimum on-time enables high VIN/VOUT ratios (e.g., 36V→3.3V), while frequency foldback during startup or overload prevents inductor saturation.

It integrates dual NMOS power switches (120mΩ top / 65mΩ bottom), a 3.4V INTVCC regulator, and a dedicated BIAS pin that reduces VIN current draw when tied to VOUT ≥3.3V. The PG flag asserts within ±8% of regulation and remains valid down to VIN = 3.0V, independent of EN/UV state.

Key Specifications

Pinout & Package

LT8610ACHMSE-1#TRPBF uses a thermally enhanced 16-lead MSOP package with exposed pad (Pin 17 = GND). The exposed pad must be soldered to PCB for θ_JA = 40°C/W and thermal reliability at 150°C junction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT8610ACEMSE-1#TRPBF, the LT8610ACHMSE-1#TRPBF adds guaranteed 150°C operation and AEC-Q100 compliance for under-hood use; versus MPQ4313-AEC1-P, it provides superior dynamic performance via adjustable frequency, TR/SS control, and higher bandwidth compensation.

Availability

LT8610ACHMSE-1#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, GSM RF amplifier biasing, and medical portable monitor designs requiring stable component supply across extended temperature and long lifecycle commitments.

Supply support for LT8610ACHMSE-1#TRPBF 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-quiescent-current synchronous buck regulators optimized for automotive and industrial applications demanding wide VIN range, high efficiency at light loads, and robust thermal performance up to 150°C.

FAQ

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

The LT8610ACHMSE-1#TRPBF is guaranteed over a –40°C to 150°C operating junction temperature range and is AEC-Q100 qualified for automotive applications. This rating enables direct placement in high-ambient environments such as engine compartments or industrial enclosures without derating, provided the exposed pad is properly soldered to a thermal plane.

How does the LT8610ACHMSE-1#TRPBF achieve 2.5µA quiescent current?

The LT8610ACHMSE-1#TRPBF achieves 2.5µA quiescent current through Burst Mode® operation: during light loads, it delivers discrete energy pulses to the output capacitor and then enters deep sleep, powering down all switching and control circuitry except essential comparators. This reduces input current to 1.7µA in sleep mode, with feedback divider current contributing the remainder.

Does the LT8610ACHMSE-1#TRPBF support output voltage tracking during power-up?

Yes, the LT8610ACHMSE-1#TRPBF supports output voltage tracking via the TR/SS pin. When a voltage below 0.8V is applied to TR/SS, the regulator forces FB to track that voltage, enabling coordinated ramp-up with other rails. A capacitor on TR/SS also programs soft-start slew rate, and the LT8610ACHMSE-1#TRPBF includes an active discharge circuit to prevent overshoot when exiting dropout.

What is the purpose of the BIAS pin on the LT8610ACHMSE-1#TRPBF?

The BIAS pin on the LT8610ACHMSE-1#TRPBF supplies bias current to the internal regulators and drivers when tied to a voltage ≥3.1V (e.g., VOUT). This reduces VIN current draw and improves light-load efficiency. For 3.3V or higher outputs, connecting BIAS to VOUT lowers total input current by up to 9mA compared to sourcing from VIN alone.

Can the LT8610ACHMSE-1#TRPBF synchronize to an external clock?

Yes, the LT8610ACHMSE-1#TRPBF supports external clock synchronization via the SYNC pin. Applying a logic-level clock (0.8V–2.4V thresholds) to SYNC aligns switching edges to the external source, enabling deterministic EMI reduction and multi-phase interleaving. When SYNC is grounded, the device operates in low-ripple Burst Mode; when pulled high, it enters pulse-skipping mode.