Analog Devices Inc. LTM4678IY#PBF

Mfr. Part

LTM4678IY#PBF

Manufacturer

ADI (Analog Devices, Inc.)

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Detailed Description

LTM4678IY#PBF is an ADI uModule DC-DC converter for board-mount power (Power Supplies - Board Mount, DC DC Converters). It is a non-isolated, digital point-of-load module with two outputs, each adjustable from 0.5 V to 3.3 V and capable of up to 25 A per output. It accepts 5.75 V to 16 V input, integrates the controller, power MOSFETs, inductors, compensation, and digital power system management, and comes in a compact 144-BGA (16 x 16) package. It supports PMBus/SMBus/I2C digital control and telemetry, includes comprehensive protections (OCP, OTP, OVP, UVLO), and operates from -40°C to +125°C. Series: LTM, uModule. Base product number: LTM4678. RoHS: ROHS3 Compliant. Quantity available: 10100 (subject to prior sale).

Key Features

Dual high-current outputs: 25 A per channel (2 outputs)

Output range: 0.5 V to 3.3 V per output

Input range: 5.75 V to 16 V (ideal for 12 V intermediate bus)

Digital power system management via PMBus/SMBus/I2C

Telemetry for voltage, current, and temperature; fault logging and reporting

Margining, sequencing, trimming, and on-the-fly reconfiguration (EEPROM-based storage)

Protections: OCP (overcurrent), OTP (overtemperature), OVP (overvoltage), UVLO (undervoltage lockout)

Non-isolated PoL module; surface-mount 144-BGA (16 x 16)

Small footprint: 16.0 mm x 16.0 mm; height: 6.3 mm

ITE (Commercial) applications; industrial operating temperature: -40°C to +125°C

RoHS3 compliant; lead-free solder balls

Key Advantages

Fast design-in: integrated magnetics and power stage reduce component count and layout effort

High power density: delivers two 25 A rails from a compact footprint

Digital visibility: live telemetry and fault logs speed bring-up and field diagnostics

Easy optimization: software-configurable voltage, sequencing, and margins without rework

Robust protection set simplifies compliance and improves system reliability

Wide VIN supports common 12 V bus systems and battery-backed inputs

Supports current sharing between channels for higher-current rails (verify details in datasheet)

Packaging

Shipment packaging: Tray

Device package/case: 144-BBGA Module; Supplier Device Package: 144-BGA (16 x 16)

Material: Lead-free, RoHS3 compliant; SAC solder balls (SnAgCu); molded uModule over organic laminate substrate with integrated magnetics

Size: 16.0 mm (L) x 16.0 mm (W) x 6.3 mm (H); 0.63" x 0.63" x 0.23"

Mounting type: Surface mount (SMT)

Pin/ball configuration: 16 x 16 matrix, 144 balls; functional groups typically include VIN, VOUT1, VOUT2, GND, sense pins, PMBus/SMBus (SCL, SDA, ALERT), enable/run, PGOOD, and clock/address pins (see datasheet for exact ball map and pitch)

Thermal characteristics: Heat is conducted through the BGA into PCB copper planes; use large power/ground planes and airflow for high-load operation; ambient operating range -40°C to +125°C

Electrical properties (summary): VIN 5.75–16 V; VOUT1 0.5–3.3 V up to 25 A; VOUT2 0.5–3.3 V up to 25 A; digital PMBus interface; protections OCP/OTP/OVP/UVLO

Lifecycle

Status: Active and in production at the time of writing; not nearing discontinuation based on publicly available information

Equivalent/alternative models (specs differ; not pin-to-pin unless stated; review datasheets carefully):

- ADI LTM4677: dual 18 A digital uModule (lower current)

- ADI LTM4680: dual 18 A or single 36 A digital uModule

- ADI LTM4686: dual 10 A digital uModule

- ADI LTM4650: dual 25 A analog uModule (no digital management)

- ADI LTM4673: single ~30 A digital uModule

- ADI LTM4700: dual 50 A or single 100 A uModule with integrated heatsink (higher power)

- ADI controller-based solutions (e.g., LTC388x family) with external power stages for custom designs

Need a drop-in replacement or a different brand/cost option? Contact Y-IC sales via our website for a tailored cross-reference and availability.

Key Application Areas

Core rails for FPGAs, ASICs, SoCs, and CPUs (e.g., 0.6–1.2 V high-current rails)

DDR memory rails and auxiliary rails in servers, storage, and networking

Telecom/datacom: line cards, routers, switches, base stations

Data centers: accelerators, AI/ML cards, NICs, enterprise SSD backplanes

Industrial computing, test and measurement, instrumentation, medical imaging

High-density point-of-load in any 12 V intermediate bus system

Datasheet

Our website hosts the most authoritative and up-to-date datasheet for LTM4678IY#PBF. Download it from this page to get complete specifications, pin maps, layout guidelines, PMBus command set, and application notes.

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