Allegro MicroSystems A8652KLPTR-T

Overview

A8652KLPTR-T from Allegro MicroSystems is a wide-input synchronous buck regulator with integrated high-side/low-side MOSFETs, remote load regulation for USB power delivery, 1 A continuous output current, ±1% feedback reference accuracy, and operation down to 2.6 V input - designed for automotive USB power ports where wiring harness voltage drop must be compensated without remote sense lines.

For engineers reviewing the A8652KLPTR-T datasheet, A8652KLPTR-T pinout, A8652KLPTR-T application, or A8652KLPTR-T equivalent, key selection criteria include its 4–36 V input range, programmable cable-drop compensation via GADJ/IADJ pins, 100 kHz–2.2 MHz adjustable switching frequency, thermal shutdown at 155°C, and AEC-Q100 qualification for automotive environments.

Technical Context

The A8652KLPTR-T implements peak current-mode control with an integrated transconductance error amplifier (750 µA/V typ), dynamic overvoltage protection tied to correction voltage, and open-loop remote load regulation that adjusts FB reference based on ISEN+/ISEN− differential voltage and user-set gain. Its architecture supports pre-bias startup and hiccup-mode short-circuit protection.

It features dual protection paths: pulse-by-pulse current limiting (1.5–2.1 A peak) and load-side foldback current limit (1.0–1.4 A), both configurable via external resistors on IADJ and GADJ. The device maintains regulation during low-dropout conditions by maximizing duty cycle when VIN approaches VOUT.

Key Specifications

Pinout & Package

16-pin eTSSOP (LP package) with 4.4 mm × 5 mm footprint, 1.2 mm nominal height, and exposed thermal pad (PAD) requiring direct connection to PCB ground plane via ≥6 thermal vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with MPQ4420AGL-A and TPS54202HDDCR, the A8652KLPTR-T uniquely delivers certified remote load regulation in an AEC-Q100 qualified package - essential for automotive USB ports where wiring loss varies with cable length and temperature, while the alternatives require additional components or lack automotive validation.

Availability

A8652KLPTR-T is available at Aetrix Electronics and suitable for automotive USB power ports, rear seat entertainment systems, and motorcycle instrument clusters requiring stable component supply with full AEC-Q100 compliance and long-term production support.

Supply support for A8652KLPTR-T 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

Allegro MicroSystems is a U.S.-based designer of high-performance power ICs and magnetic sensors, specializing in automotive-grade analog and mixed-signal solutions.

The A8652KLPTR-T belongs to Allegro's automotive synchronous buck regulator product line, engineered specifically for USB power delivery in vehicles with long wiring harnesses - addressing voltage drop compensation, thermal robustness, and functional safety requirements.

FAQ

What is the maximum continuous output current of the A8652KLPTR-T?

The A8652KLPTR-T delivers 1 A continuous output current under typical thermal conditions (4-layer PCB, RθJA = 34°C/W). This rating assumes proper thermal pad soldering with ≥6 vias to ground and ambient temperature ≤85°C. At higher temperatures or reduced copper area, derating applies - see Figure 11 in the datasheet for thermal performance curves. The A8652KLPTR-T is distinct from the A8653KLPTR-T, which supports 2.6 A.

How does remote load regulation work in the A8652KLPTR-T?

Remote load regulation in the A8652KLPTR-T uses an open-loop correction scheme: it measures load current via ISEN+/ISEN−, scales the measurement using gain set by RGADJ and RIADJ, and adds the resulting voltage to the internal 800 mV reference at the error amplifier. This raises the FB target voltage proportionally to load current, increasing VOUT to offset wiring harness IR drop - achieving ±2% accuracy at 500 mV correction without remote sense traces.

Can the A8652KLPTR-T operate with input voltage below 4 V?

Yes - the A8652KLPTR-T remains functional down to 2.6 V input (UVLO stop threshold), though regulation is only guaranteed above 4 V per specification. Below 4 V, the device sustains operation with reduced duty cycle and may not maintain full output accuracy or current capability. This extended low-VIN capability supports cold-cranking scenarios in automotive systems where battery voltage dips transiently.

What package type and thermal requirements apply to the A8652KLPTR-T?

The A8652KLPTR-T uses a 16-pin eTSSOP (LP) package with 4.4 mm × 5 mm body and exposed thermal pad. To achieve rated 1 A performance, the PAD must be soldered to a solid PCB ground plane using ≥6 thermal vias (0.3 mm diameter minimum). Thermal resistance is 34°C/W (RθJA, JEDEC 4-layer board); insufficient thermal relief causes early thermal shutdown at ~155°C junction temperature.

Is the A8652KLPTR-T AEC-Q100 qualified, and what grade does it meet?

Yes, the A8652KLPTR-T is AEC-Q100 qualified per Grade 1 requirements (–40°C to +125°C junction temperature). It has undergone full stress testing including HTOL, TC, UHAST, and ESD (HBM ±2 kV, CDM ±1 kV). This qualification covers all electrical parameters in the datasheet across the full temperature range, making it suitable for engine bay, dashboard, and infotainment applications where automotive reliability is mandatory.