Analog Devices Inc. LTC3890HUH-2#TRPBF

Overview

LTC3890HUH-2#TRPBF from Analog Devices is a high-efficiency, dual-phase synchronous step-down DC/DC controller driving two independent N-channel MOSFET stages. It operates from 4V to 60V input, delivers up to 8.5V/3.3V outputs, supports out-of-phase operation to reduce input ripple, and features 50µA quiescent current in single-channel sleep mode - ideal for automotive always-on systems requiring low-power, wide-input regulation.

For engineers reviewing the LTC3890HUH-2#TRPBF datasheet, LTC3890HUH-2#TRPBF pinout, LTC3890HUH-2#TRPBF application, or LTC3890HUH-2#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, –40°C to 150°C junction temperature rating, dual-channel phase-lockable frequency (75–850kHz), selectable light-load modes (Burst/Pulse-Skipping/Continuous), and independent TRACK/SS and PGOOD pins per channel.

Technical Context

The LTC3890HUH-2#TRPBF implements constant-frequency current-mode control with two fully independent controllers operating 180° out-of-phase to minimize input capacitor RMS current and power supply noise. Each channel features dedicated ITH, VFB, TRACK/SS, PGOOD, and SENSE+/- pins enabling precise loop compensation, output tracking, and differential current sensing via RSENSE or DCR.

Its OPTI-LOOP® compensation architecture adapts transient response across wide output capacitance and ESR ranges, while the internal 5.1V INTVCC LDO (with EXTVCC switchover at 4.7V) powers gate drivers and control circuitry. The device supports programmable current limit via ILIM pin selection (GND/FLOAT/INTVCC) and includes dropout detection with forced TG off-pulse to maintain bootstrap capacitor recharge under 99% duty cycle conditions.

Key Specifications

Pinout & Package

Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (Pin 33 = SGND), 0.75mm profile, RoHS-compliant. Requires soldering of exposed pad to PCB ground for thermal performance (θ_JA = 34°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3890IUH-2#TRPBF and LTC3890EUH-2#TRPBF, the LTC3890HUH-2#TRPBF provides guaranteed operation up to 150°C junction temperature and formal AEC-Q100 qualification - making it the only option for thermally demanding automotive power domains where long-term reliability under sustained high-temperature stress is mandatory.

Availability

LTC3890HUH-2#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, battery-powered telemetry nodes, and telecom distributed power systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for LTC3890HUH-2#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 automotive, industrial, communications, and healthcare markets with precision power, signal chain, and RF solutions.

The LTC3890 family is designed for high-efficiency, wide-input dual-output DC/DC conversion in space-constrained, thermally demanding applications - specifically targeting automotive subsystems, industrial controls, and telecom infrastructure where reliability, low IQ, and flexible configuration are critical.

FAQ

What is the maximum junction temperature specification for the LTC3890HUH-2#TRPBF?

The LTC3890HUH-2#TRPBF is rated for operation up to 150°C junction temperature and is AEC-Q100 qualified for automotive applications. This specification is explicitly defined in the Absolute Maximum Ratings table and confirmed in the Temperature Grade column of the Order Information section, distinguishing it from the I-grade (125°C) and E-grade (85°C) variants of the same part number family.

Does the LTC3890HUH-2#TRPBF support phase synchronization with external clock sources?

Yes, the LTC3890HUH-2#TRPBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal is applied to this pin, the internal phase-locked loop forces the rising edge of TG1 to align with the rising edge of the external clock, enabling precise timing coordination across multiple converters in a system - a capability confirmed in the Features and Pin Functions sections of the datasheet.

How does the ILIM pin affect current limiting on the LTC3890HUH-2#TRPBF?

The ILIM pin on the LTC3890HUH-2#TRPBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly sets the peak inductor current trip point for both channels, allowing hardware-configurable overcurrent protection without external resistor networks - as documented in the Electrical Characteristics table under VSENSE(MAX).

Can the LTC3890HUH-2#TRPBF operate with only one channel enabled?

Yes, the LTC3890HUH-2#TRPBF supports independent channel control via RUN1 and RUN2 pins. Pulling RUN1 below 1.15V disables Channel 1 while leaving Channel 2 operational, and vice versa. Both channels enter ultra-low 14µA shutdown only when both RUN pins fall below 0.7V - a feature verified in the Shutdown and Start-Up section and Absolute Maximum Ratings.

What is the purpose of the PHASMD pin on the LTC3890HUH-2#TRPBF?

The PHASMD pin configures the phase relationship between TG1, TG2, and CLKOUT. Grounding PHASMD sets TG2 and CLKOUT to 180° and 60° out-of-phase with TG1; connecting to INTVCC sets them to 240° and 120°; floating yields 180° and 90°. This enables flexible PolyPhase® interleaving for input ripple reduction - detailed in the Pin Functions section and Table 1 of the datasheet.