Analog Devices Inc. LTC3862EUH-1#TRPBF

Overview

LTC3862EUH-1#TRPBF from Analog Devices (formerly Linear Technology) is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving external N-channel MOSFETs. It operates from 8.5V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz programmable switching frequency, and integrates dual 10V gate drivers for high-voltage MOSFETs - used in telecom power supplies requiring high-efficiency, low-noise, multi-phase step-up conversion.

For engineers reviewing the LTC3862EUH-1#TRPBF datasheet, LTC3862EUH-1#TRPBF pinout, LTC3862EUH-1#TRPBF application, or LTC3862EUH-1#TRPBF equivalent, key selection criteria include phase synchronization capability (SYNC/CLKOUT), adjustable slope compensation, ±1% reference accuracy, thermal performance of the 5mm × 5mm QFN package, and precise DMAX/PHASEMODE configuration for multi-phase scalability.

Technical Context

The LTC3862EUH-1#TRPBF implements fixed-frequency peak current mode control with independent per-channel current sensing (SENSE1±/SENSE2±) and internal 1.223V reference (±1%). Its dual-phase architecture uses 180° interleaving to reduce input/output ripple and filter component stress.

It features cascaded LDOs: a 10V INTVCC regulator (7.5V UVLO rising threshold) powers gate drivers, while a 3.8V 3V8 LDO supplies analog/digital circuitry. Phase relationships (CH1–CH2, CH1–CLKOUT) are programmable via PHASEMODE voltage (0V/float/3.8V), enabling 2-, 3-, 4-, 6-, or 12-phase system expansion using SYNC and CLKOUT signals.

Key Specifications

Pinout & Package

Package: 24-lead (5mm × 5mm) plastic QFN with 0.65mm lead pitch and exposed PGND pad (Pin 25), thermally optimized for θJA = 44°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost/SEPIC controller applications.

Compared with LTC3862EUH-1#TRPBF, the I- and H-grade variants offer identical control architecture and feature set but guarantee operation across wider temperature ranges - enabling drop-in replacement in thermally demanding environments without layout or schematic changes.

Availability

LTC3862EUH-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, industrial motor drive bias circuits, and automotive ADAS camera power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC3862EUH-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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio with rigorous qualification standards and long-term product roadmaps.

The LTC3862 family is designed for high-efficiency, multi-phase DC/DC conversion in telecom, industrial, and automotive applications - emphasizing thermal resilience, precise current sensing, and flexible phase synchronization.

FAQ

What is the maximum achievable output voltage using LTC3862EUH-1#TRPBF in a boost configuration?

The LTC3862EUH-1#TRPBF itself does not impose a hard output voltage limit; it controls external MOSFETs and diodes. In practice, output voltage is constrained by component ratings and stability. With 96% max duty cycle and typical 36V VIN, outputs up to 900V are feasible using appropriate magnetics and HV diodes - however, the reference accuracy (±1%) and feedback divider tolerance dominate regulation error at high gains. For 72V output (as in typical eval circuits), regulation remains within ±0.7% over line/load/temperature.

Can LTC3862EUH-1#TRPBF be used in SEPIC topology, and what design considerations apply?

Yes, LTC3862EUH-1#TRPBF supports SEPIC operation per its datasheet. Key requirements include coupling the two inductors on a common core for automatic current balancing, using matched sense resistors for SENSE1+/SENSE2+, and ensuring the transformer turns ratio and capacitor voltage ratings accommodate both input and output extremes. The controller's ability to operate down to 8.5V VIN and regulate above VIN makes it ideal for wide-input SEPIC designs - such as 9–36V input to 24V output with reverse polarity immunity.

How does the PHASEMODE pin affect multi-phase synchronization when using multiple LTC3862EUH-1#TRPBF devices?

The PHASEMODE pin on each LTC3862EUH-1#TRPBF sets the relative phase between its own CH1 and CH2 channels, and between CH1 and its CLKOUT signal. When cascading multiple ICs, CLKOUT from Master drives SYNC of Slave(s); PHASEMODE voltage on each device determines whether downstream channels align at 120°, 180°, or other offsets - enabling precise ripple cancellation across 2-, 3-, 4-, 6-, or 12-phase systems without external phase-shifters or complex timing ICs.

What is the purpose of the 3V8 pin, and can it power external circuitry?

3V8 is the output of an internal LDO powered from INTVCC, providing a regulated 3.8V supply exclusively for the LTC3862EUH-1#TRPBF's internal analog and digital circuitry (error amp, comparators, logic). It is not rated for external loads: the datasheet explicitly states "This LDO is not intended to be used as a supply for external circuitry." External use risks instability, reference drift, or failure to meet specified hysteresis and accuracy - always use a dedicated regulator for external 3.3V/3.8V rails.

Does LTC3862EUH-1#TRPBF support pulse-skipping mode, and how is it enabled?

Yes, LTC3862EUH-1#TRPBF supports pulse-skipping mode (PSKIP) at light loads to improve efficiency. It activates automatically when the ITH pin voltage falls below 0.275V (with 25mV hysteresis), causing the controller to skip switching cycles while maintaining regulation. No external components or pin strapping is required - PSKIP behavior is inherent to the error amplifier architecture and occurs seamlessly during transient load reduction, as verified in Typical Performance Characteristic Figure G03 (inductor current at light load).