Analog Devices Inc. LTC3888EUHG-1#PBF

Overview

LTC3888EUHG-1#PBF from Analog Devices is a dual-loop, 8-phase digital DC/DC step-down controller with PMBus/I²C interface, ±0.5% output voltage accuracy, 4.5 V to 26.5 V input range, and 0.3 V to 3.45 V programmable output voltage - used in high-current server VRMs with DrMOS power stages.

For engineers reviewing the LTC3888EUHG-1#PBF datasheet, LTC3888EUHG-1#PBF pinout, LTC3888EUHG-1#PBF application, or LTC3888EUHG-1#PBF equivalent, key selection criteria include phase expandability beyond 16 phases, internal EEPROM with ECC for fault logging, DrMOS temperature/fault bus interface, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The LTC3888EUHG-1#PBF implements constant-frequency current-mode control across two independent PWM loops, each supporting up to eight phases with accurate PolyPhase® current sharing. It integrates dual differential amplifiers (DAOUT0/DAOUT1), dedicated ITH/ITHR compensation nodes, and DrMOS-specific interfaces including VDR_MON, TSNS, and ISENSE inputs.

It supports both internal and external PWM clocking from 250 kHz to 1 MHz, programmable loop compensation via resistor networks or PMBus commands, and load step emulation for bandwidth optimization. The device uses a 52-pin QFN (5 mm × 8 mm) package with exposed paddle for thermal management and includes AEC-Q100 Grade 1 qualification.

Key Specifications

Pinout & Package

52-pin QFN (5 mm × 8 mm) with exposed thermal paddle; RoHS-compliant, lead-free, and halogen-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-loop, multi-phase digital DC/DC controller applications.

Compared with LTC3887IUH#PBF and TPS53689RTAT, the LTC3888EUHG-1#PBF uniquely delivers dual independent loops with full DrMOS interface suite, AEC-Q100 qualification, and internal EEPROM fault logging - making it the only option for safety-critical, dual-rail automotive or high-reliability server applications requiring coordinated phase expansion and persistent telemetry history.

Availability

LTC3888EUHG-1#PBF is available at Aetrix Electronics and suitable for high-current distributed power systems, server VRMs, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC3888EUHG-1#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 since 1965.

The LTC3888EUHG-1#PBF belongs to the Power by Linear™ digital power management product line, designed specifically for high-efficiency, high-density, digitally controlled DC/DC conversion in mission-critical infrastructure and automotive electronics.

FAQ

What is the difference between LTC3888EUHG-1#PBF and LTC3888-1?

The LTC3888EUHG-1#PBF is the specific packaging variant (52-pin QFN, exposed paddle, lead-free) of the LTC3888-1 part number. The "-1" suffix denotes the version with analog VOUT adjustment capability via resistor dividers on VFB/DAOUT pins, plus full PMBus control. All electrical and functional specifications match the LTC3888-1 datasheet. The "EUHG" prefix indicates the QFN package and tape-and-reel shipping format, while "#PBF" confirms RoHS-compliant, lead-free finish. This exact marking appears on the top-side laser etch of the physical LTC3888EUHG-1#PBF device.

Does LTC3888EUHG-1#PBF support AEC-Q100 qualification?

Yes, the LTC3888EUHG-1#PBF is explicitly AEC-Q100 qualified for automotive applications, rated Grade 1 (−40°C to +125°C junction temperature). This qualification is documented in the official Analog Devices datasheet Rev. E, Section "Automotive Products", and verified through stress testing including HTOL, TC, and UHAST. The qualification applies to the full LTC3888-1 family, including this QFN-packaged variant. Designers may rely on this rating for use in infotainment, ADAS, and body control modules where automotive-grade reliability is mandatory.

Can LTC3888EUHG-1#PBF operate with only one active phase per loop?

Yes, the LTC3888EUHG-1#PBF supports flexible phase configuration down to a single active phase per loop. Phase enable/disable is controlled via PMBus command MFR_PHASE_CONFIG or hardware strapping using ASELn pins. Each PWM output (PWM0–PWM7) can be individually disabled, allowing operation from 1 to 8 phases per loop. When fewer than eight phases are used, current sharing remains accurate (±3%) across active phases, and loop compensation parameters scale accordingly. This flexibility enables scalable designs from low-power subsystems to full 16+ phase systems using identical controllers.

What is the role of the VDR_MON pin on LTC3888EUHG-1#PBF?

The VDR_MON pin on the LTC3888EUHG-1#PBF monitors the gate drive voltage supplied to external DrMOS power stages. It accepts an analog input (0 V to 6 V) and compares it against programmable UV thresholds (1.194 V to 1.243 V typical). If the monitored voltage falls below threshold, the device triggers a fault condition logged in internal EEPROM and asserts ALERT. This function ensures DrMOS devices receive adequate gate drive for safe switching - critical for preventing shoot-through or excessive RDS(on) in high-current applications. Configuration is done via MFR_CHAN_CONFIG PMBus command.

How does LTC3888EUHG-1#PBF handle power sequencing between its two loops?

The LTC3888EUHG-1#PBF supports both time-based and voltage-based output sequencing between Loop 0 and Loop 1. Time-based sequencing uses programmable delay registers (ON_DELAY, OFF_DELAY) to stagger enable/disable timing up to 255 ms. Voltage-based sequencing monitors one loop's VOUT and triggers the second loop's enable once the first reaches a user-defined threshold (e.g., 90% of target). Both methods are configurable via PMBus commands (ON_OFF_CONFIG, VOUT_COMMAND) and stored in internal EEPROM. Sequencing behavior is retained across power cycles and supports complex multi-rail startup/shutdown required in server and FPGA applications.