Analog Devices Inc. LTC3722EGN-1#TRPBF

Overview

LTC3722EGN-1#TRPBF from Analog Devices is a peak current mode, phase-shift PWM full-bridge controller for zero-voltage-switched (ZVS) DC/DC converters. It delivers adaptive ZVS delay control, programmable slope compensation, leading edge blanking, and 50mA gate drivers for six external MOSFETs - supporting up to 240W at 12V output with >95% efficiency at 48V input. Used in telecom infrastructure power supplies.

For engineers reviewing the LTC3722EGN-1#TRPBF datasheet, LTC3722EGN-1#TRPBF pinout, LTC3722EGN-1#TRPBF application, or LTC3722EGN-1#TRPBF equivalent, key selection criteria include ZVS timing accuracy, synchronous rectifier driver capability, UVLO hysteresis programmability, and compatibility with external gate drivers like LTC4440/LTC3901.

Technical Context

The LTC3722EGN-1#TRPBF implements peak current mode control with internal slope compensation and leading edge blanking on the CS pin. Its phase modulator adjusts duty overlap between diagonal bridge legs to regulate output voltage via COMP feedback, while adaptive ZVS circuitry independently delays OUTA–OUTD turn-on based on SBUS voltage and ADLY/PDLY inputs.

It integrates a 5V reference (±1.5% initial accuracy), 10.25V VCC UVLO with 4.2V hysteresis, and dual 50mA synchronous rectifier drivers (OUTE/OUTF) with SPRG-programmable turn-off delay. The oscillator operates at 250kHz (±10%) with CT pin timing and SYNC input/output capability.

Key Specifications

Pinout & Package

Package: 24-lead narrow plastic SSOP (GN), RoHS-compliant, –40°C to 85°C operating junction temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar full-bridge phase-shift controller applications.

Compared with UCC3895DR and LTC3722EGN-2#TRPBF, the LTC3722EGN-1#TRPBF uniquely combines peak current mode control with adaptive ZVS, programmable blanking, and synchronous rectifier timing - enabling higher efficiency and simpler layout in mid-to-high-power telecom and server applications.

Availability

LTC3722EGN-1#TRPBF is available at Aetrix Electronics and suitable for telecom rectifier modules, server power supplies, and distributed power architecture converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC3722EGN-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC3722 product line was designed specifically for zero-voltage-switched full-bridge DC/DC converters in high-efficiency, high-reliability infrastructure power systems - emphasizing adaptive timing control, integrated protection, and minimal external component count.

FAQ

What is the primary control architecture of the LTC3722EGN-1#TRPBF?

The LTC3722EGN-1#TRPBF uses peak current mode control with programmable slope compensation and leading edge blanking. This architecture provides fast transient response, inherent cycle-by-cycle current limiting, and stable loop behavior across wide duty cycles - critical for maintaining regulation during load steps in telecom and server power supplies. Unlike the LTC3722EGN-2#TRPBF, it does not use voltage mode control.

How does the adaptive ZVS function work on the LTC3722EGN-1#TRPBF?

The LTC3722EGN-1#TRPBF implements adaptive ZVS by monitoring SBUS voltage (derived from input bus via resistor divider) and using ADLY/PDLY inputs to dynamically adjust turn-on delays for OUTA–OUTD. This compensates for component tolerances and load variations, ensuring zero-voltage switching across 10–100% load range without manual trimming - a key advantage over fixed-delay controllers like UCC3895DR.

Can the LTC3722EGN-1#TRPBF drive MOSFETs directly, or does it require external gate drivers?

The LTC3722EGN-1#TRPBF provides six ±50mA gate drivers (OUTA–OUTF) but cannot drive power MOSFETs directly due to voltage level and current limitations. It is designed to interface with external high-speed gate drivers such as LTC4440 (for primary-side high-side/low-side) and LTC3901 (for secondary-side synchronous rectifiers). This separation ensures robust isolation and optimized drive strength.

What is the purpose of the RLEB pin on the LTC3722EGN-1#TRPBF?

The RLEB pin on the LTC3722EGN-1#TRPBF sets leading edge blanking time for the CS current sense input using a 10k–100k resistor. This blanking (40–310 ns) prevents false current-limit triggering caused by gate-drive noise or transformer leakage spikes during MOSFET turn-on - a feature absent in the LTC3722EGN-2#TRPBF, which uses fixed 80ns blanking.

Does the LTC3722EGN-1#TRPBF support synchronization with other controllers?

Yes, the LTC3722EGN-1#TRPBF supports synchronization via its SYNC pin, which functions as both input and output. With a 1.9V CMOS/TTL-compatible threshold and minimum 75ns pulse width, it allows precise alignment of switching frequencies across multiple phases or converters - reducing EMI peaks and enabling interleaved operation in high-power systems.