Analog Devices Inc. LT8602ELXE#PBF

Overview

LT8602ELXE#PBF from Analog Devices is a quad-channel monolithic synchronous step-down regulator with two 3V–42V high-voltage channels (1.5A/2.5A) and two 2.6V–5.5V low-voltage channels (1.8A/1.8A), programmable 250kHz–2.2MHz switching frequency, 30µA quiescent current in Burst Mode®, and integrated power-on reset with adjustable delay via CPOR capacitor. It enables compact, high-efficiency multi-rail power for automotive ADAS domain controllers.

For engineers reviewing the LT8602ELXE#PBF datasheet, LT8602ELXE#PBF pinout, LT8602ELXE#PBF application, or LT8602ELXE#PBF equivalent, key selection criteria include channel-specific input voltage ranges, per-channel current limits (SW1: 2.7A typ, SW2: 4.0A typ, SW3/SW4: 3.1A avg), FB reference voltages (1.0V for HV, 0.8V for LV), and thermal performance in the 48-lead eLQFP package with exposed pad.

Technical Context

The LT8602ELXE#PBF implements a constant-frequency current-mode control architecture with a single oscillator generating two 180°-out-of-phase clock signals (CLK1 for Ch1/Ch3, CLK2 for Ch2/Ch4) to reduce input ripple. Each channel features independent PVIN supplies, cycle-by-cycle current limiting, and open-drain PG outputs with ±8% regulation window.

High-voltage channels use 1V internal reference (or track TRKSS pin) with BST1/BST2 bootstrapped gate drives; low-voltage channels use fixed 0.8V reference, RUN3/RUN4 sequencing inputs, and internal soft-start (1ms typ). Power-on reset is triggered by POREN and timed by CPOR capacitance (35.2ms typ with 1nF).

Key Specifications

Pinout & Package

LT8602ELXE#PBF is housed in a 48-lead plastic eLQFP (7mm × 7mm) with exposed thermal pad (Pin 49 = GND). The package meets MSL Level 3 and operates from –40°C to +125°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-output buck regulator applications.

Compared with LT8603ELXE#PBF, LT8602ELXE#PBF offers lower quiescent current and no integrated LDO-ideal for space-constrained designs where external LDOs are already present. Versus MPQ4436GL-AEC1-Z, LT8602ELXE#PBF provides superior light-load efficiency, programmable reset, and comprehensive power-good signaling at the expense of AEC-Q100 certification.

Availability

LT8602ELXE#PBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial PLC I/O modules, and distributed telecom baseband units requiring stable component supply across extended temperature and long production lifecycles.

Supply support for LT8602ELXE#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 industrial, automotive, communications, and healthcare markets.

The LT8602ELXE#PBF belongs to the Power by Linear™ family of high-efficiency monolithic DC/DC regulators, engineered for demanding multi-rail power systems in automotive, industrial, and infrastructure applications where reliability, low EMI, and precise sequencing are critical.

FAQ

What is the maximum input voltage rating for the high-voltage channels of the LT8602ELXE#PBF?

The LT8602ELXE#PBF high-voltage channels (Ch1 and Ch2) accept up to 42V on their respective PVIN1 and PVIN2 pins. Absolute maximum rating is 42V; operation above this risks permanent damage. The device is designed for direct connection to 12V and 24V automotive batteries, including load dump transients when properly protected externally.

How does the LT8602ELXE#PBF achieve low output ripple in Burst Mode® operation?

The LT8602ELXE#PBF achieves <15mV peak-to-peak output ripple in Burst Mode® by minimizing switching node dV/dt during burst cycles and maintaining tight regulation of the feedback loop even at ultra-low load currents. Its proprietary low-ripple architecture shuts down non-essential circuitry between bursts while preserving error amplifier bias and comparator thresholds, ensuring fast transient response and minimal voltage deviation.

Can the LT8602ELXE#PBF synchronize its switching frequency to an external clock source?

Yes, the LT8602ELXE#PBF supports external synchronization via the SYNC pin. When driven with a logic-level clock signal between 0.25MHz and 2.2MHz, the internal oscillator locks to the external frequency. If synchronization is not used, SYNC must be tied to GND (enabling low-ripple Burst Mode®) or high (enabling pulse-skipping mode); floating SYNC is prohibited.

What is the function of the RUN3 and RUN4 pins on the LT8602ELXE#PBF?

The RUN3 and RUN4 pins are enable inputs for the low-voltage channels (Ch3 and Ch4). They allow independent control of startup timing and support power sequencing. When pulled above 0.72V (typ), the corresponding channel begins soft-start; below 0.695V, the channel remains disabled. This enables ordered power-up/down sequences critical in FPGA and processor-based systems.

How is the power-on reset delay time programmed on the LT8602ELXE#PBF?

The power-on reset delay time on the LT8602ELXE#PBF is programmed using an external capacitor connected from the CPOR pin to GND. With a 1000pF capacitor, the typical delay is 35.2ms (range: 31–39.4ms). The internal 2µA pull-up current charges CPOR; delay scales linearly with capacitance. The POREN pin must be high to activate the timer, and RST goes high only after timeout and when INTVCC exceeds 2.7V.