Analog Devices Inc. LT8204RFE#TRPBF

Overview

LT8204RFE#TRPBF from Analog Devices is a 40V full-bridge or dual half-bridge controller IC designed for precision bidirectional current regulation in solenoid, TEC, and active damping systems. It supports peak current mode or voltage mode PWM control, features dual 16-bit monotonic DACs, dual rail-to-rail current monitors (200μV V_OS), and operates from 5.5V to 40V input. It delivers precise on-the-fly output current/voltage programming via 4-wire SPI with error detection.

For engineers reviewing the LT8204RFE#TRPBF datasheet, LT8204RFE#TRPBF pinout, LT8204RFE#TRPBF application, or LT8204RFE#TRPBF equivalent, this page provides verified functional identity, validated 38-lead TSSOP package mapping, confirmed dual 16-bit DAC resolution and ±8A solenoid driver capability, SPI-based fault reporting, and real-world use cases in vibration control and thermoelectric cooling systems.

Technical Context

The LT8204RFE#TRPBF implements configurable dual half-bridge or four-switch full-bridge topologies with independent gate drivers for N-channel MOSFETs. Its dual current-sense amplifiers support load-to-GND or load-to-VIN configurations with programmable threshold ranges (±55mV to ±95mV) and 50mV/mV gain.

It integrates two error amplifiers (1.2mS gm), 100kHz–1MHz adjustable switching frequency with spread spectrum and SYNC capability, and a robust SPI interface (up to 25MHz at 3.3–5.25V) supporting register read/write, fault status reporting, and DAC updates with CRC error detection.

Key Specifications

Pinout & Package

LT8204RFE#TRPBF is housed in a 38-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 39 = GND), rated for –40°C to +150°C junction temperature and θ_JA = 25°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar full-bridge/dual half-bridge controller applications.

Compared with LTC7001EMSE#TRPBF and MPQ6535-AEC1-P, the LT8204RFE#TRPBF uniquely integrates dual 16-bit DACs, rail-to-rail 200μV-offset current monitors, and SPI-based system-level fault reporting - enabling single-chip, high-accuracy bidirectional actuator control without external signal conditioning.

Availability

LT8204RFE#TRPBF is available at Aetrix Electronics and suitable for solenoid actuation, thermoelectric cooling, and active vibration damping applications requiring stable component supply, extended temperature operation, and high-precision current regulation.

Supply support for LT8204RFE#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 industrial, automotive, communications, and healthcare markets.

The LT8204 product line delivers highly integrated, high-voltage bridge controllers for precision bidirectional power conversion in demanding motion control and thermal management systems.

FAQ

What is the maximum operating junction temperature for the LT8204RFE#TRPBF?

The LT8204RFE#TRPBF is specified for operation from –40°C to +150°C junction temperature. Its thermal design includes an exposed pad (Pin 39) that must be soldered to the PCB ground plane to achieve the rated θ_JA of 25°C/W. Continuous operation above 125°C derates lifetime, and overtemperature protection activates above 150°C to prevent permanent damage. This makes the LT8204RFE#TRPBF suitable for under-hood automotive and industrial motor control environments.

Does the LT8204RFE#TRPBF support both full-bridge and dual half-bridge configurations?

Yes, the LT8204RFE#TRPBF supports both configurations via MODE1 and MODE2 pin states. In full-bridge mode, it drives four external N-MOSFETs for single-load bidirectional control. In dual half-bridge mode, it independently controls two separate loads - ideal for dual-solenoid or push-pull TEC systems. The datasheet provides distinct startup sequences, PWM timing, and current-sense thresholds for each configuration, ensuring reliable operation in either topology. This flexibility is built into the LT8204RFE#TRPBF's core architecture.

How does the LT8204RFE#TRPBF implement bidirectional current sensing?

The LT8204RFE#TRPBF uses two independent, rail-to-rail current sense amplifier pairs (CSP1/CSN1 and CSP2/CSN2) with 200μV input offset voltage. Each pair accepts differential inputs across a sense resistor and outputs a corresponding voltage on SNSP/SNSN pins. The device supports both load-to-GND and load-to-VIN configurations, with programmable positive/negative current thresholds (±55mV to ±95mV). This architecture enables true bidirectional ±8A current regulation in the LT8204RFE#TRPBF without polarity-reversal circuitry or external op-amps.

What SPI features does the LT8204RFE#TRPBF include for system monitoring?

The LT8204RFE#TRPBF features a robust 4-wire SPI interface with error detection and correction, supporting up to 25MHz clock rates. It reports real-time fault conditions including loss of load connection, external MOSFET failure, overtemperature, and undervoltage lockout via dedicated status registers. The ALERT pin asserts asynchronously on critical faults, while SPI reads provide detailed diagnostics - all accessible without interrupting normal operation. This comprehensive monitoring is integral to the LT8204RFE#TRPBF's system-level reliability design.

Can the LT8204RFE#TRPBF's DAC outputs be used for voltage regulation?

Yes, the LT8204RFE#TRPBF's dual 16-bit monotonic DACs can configure the device for output voltage regulation instead of current regulation. When used with the VMON pin and differential voltage sense inputs (CSN1/CSN2), the DACs set precise voltage reference points for closed-loop control. The DAC range spans 1/18 to 17/18 × V_REFIN/OUT, supporting both internal 2.048V/4.096V references and external references up to INTVCC. This dual-mode capability is a defined function of the LT8204RFE#TRPBF, enabling flexible use in power supplies or precision voltage sources.