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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3874IUF-1#TRPBF

Name: LTC3874IUF-1#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3874IUF-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3874IUF-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 24-WFQFN Exposed Pad

Datasheet:: LTC3874IUF-1#TRPBF.pdf

Description:: IC REG CTRLR BUCK 24QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LTC3874IUF-1#TRPBF from Analog Devices is a dual-phase PolyPhase® synchronous step-down slave controller designed for high-current multiphase DC/DC conversion. It operates with master controllers (e.g., LTC3884-1) to extend phase count up to 12 phases, supports sub-milliohm DCR current sensing (down to 0.2 mΩ), delivers accurate phase-to-phase current sharing under dynamic loads, and targets 1.8 V/120 A telecom and datacom power rails.

For engineers reviewing the LTC3874IUF-1#TRPBF datasheet, LTC3874IUF-1#TRPBF pinout, LTC3874IUF-1#TRPBF application, or LTC3874IUF-1#TRPBF equivalent, key selection criteria include its 24-pin 4 mm × 4 mm QFN package, 250 kHz–1 MHz PLL-synchronizable switching frequency, ±0.15 µA ISENSE bias current, 4.5 V–38 V input range, and compatibility with DrMOS, external gate drivers, or discrete MOSFETs in high-efficiency, low-jitter power delivery systems.

Technical Context

The LTC3874IUF-1#TRPBF implements a proprietary peak current mode control architecture where each channel's PWM duty cycle is governed by the master controller's ITH voltage, enabling precise current regulation without output voltage feedback. Its dedicated sub-milliohm DCR sensing path-enabled via the LOWDCR pin-uses enhanced signal-to-noise ratio circuitry to support 0.2 mΩ inductor DCR while maintaining stable current limit accuracy across temperature.

It integrates a phase-locked loop (PLL) for synchronization to an external SYNC clock (250 kHz–1 MHz), configurable phase offsets via PHASMD (0°–300° per channel), and independent RUN/FAULT signaling for coordinated startup and fault response with master ICs. The device draws power from INTVCC (5.5 V regulator) or EXTVCC (bypass mode ≥4.7 V), with internal 500 kΩ pull-downs on MODE/FAULT pins and 500 kΩ pull-up on LOWDCR.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5 V to 38 V - supports wide-input industrial and telecom supplies without external regulators.
Switching Frequency Range	250 kHz to 1 MHz - programmable via FREQ pin (10 µA sink) or PLL-locked to external SYNC clock.
Current Sense Threshold Range	14.5 mV to 79 mV - selectable via ILIM and LOWDCR pins to match master controller current limits.
ISENSE Bias Current	±0.15 µA - enables high-accuracy sub-milliohm DCR sensing with minimal offset error.
Package	24-lead 4 mm × 4 mm QFN - exposes thermal pad (Pin 25 = GND) for efficient heat dissipation in high-current designs.
Operating Junction Temp	−40°C to +125°C - qualified for industrial and extended-temperature embedded power systems.
DCR Sensing Capability	Down to 0.2 mΩ - requires careful PCB layout but eliminates sense resistor conduction loss at high load currents.

Pinout & Package

24-lead (4 mm × 4 mm) plastic QFN package with exposed thermal pad (Pin 25 = GND). Requires soldering of exposed pad to solid ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
ISENSE0+, ISENSE1+	Current sense comparator (+) inputs	Connect to DCR filter network; common-mode range 0–3.5 V (LOWDCR = INTVCC) or 0–5.5 V (LOWDCR = GND).
ISENSE0−, ISENSE1−	Current sense comparator (−) inputs	Connect directly to VOUT node; defines current sense reference point for DCR measurement.
RUN0, RUN1	Channel enable inputs	Logic high (>2.0 V) enables corresponding PWM channel; internal pull-down ensures safe shutdown during power-up.
PWM0, PWM1	Top-gate drive outputs	Three-state compatible outputs driving external gate drivers, DrMOS, or discrete MOSFETs; swing = 0 to VCC0/VCC1.
ITH0, ITH1	Current threshold control inputs	Accept master controller's ITH voltage to set per-channel peak inductor current; no local regulation.
SYNC	External clock input	Falling-edge synchronized PLL input; locks internal oscillator to master clock for ripple reduction and EMI control.
PHASMD	Phase offset control	Four-level analog input (GND, 1/3·INTVCC, 2/3·INTVCC, INTVCC) sets relative 0°–300° phase shift between channels and SYNC.
FAULT0, FAULT1	Master fault indicator inputs	Open-drain-compatible inputs; floating or low disables corresponding PWM output in three-state mode.
LOWDCR	Sub-milliohm DCR enable	Internal 500 kΩ pull-up to INTVCC; logic high enables enhanced SNR path for ≤0.2 mΩ DCR sensing.
ILIM	Current limit range select	4-level logic input selecting high/low current threshold ranges per channel to match master controller settings.

Key Features

Feature	Design Value
Sub-milliohm DCR sensing	Enables use of 0.2 mΩ inductor DCR with 14 dB SNR improvement-eliminates sense resistor losses and reduces thermal stress at >100 A loads.
Programmable CCM/DCM operation	MODE0/MODE1 pins select forced continuous or discontinuous conduction mode per channel-optimizes light-load efficiency vs. output ripple trade-off.
Phase-locked synchronization	Integrated PLL locks to external SYNC clock (250 kHz–1 MHz); reduces input capacitor RMS current and EMI by distributing switching events across phases.
Accurate multi-phase current sharing	Peak current mode control with master-driven ITH voltage ensures <±3% phase-to-phase current mismatch under transient and steady-state conditions.
Wide VIN and VOUT flexibility	4.5 V–38 V input range; output voltage set by master controller-supports 1.2 V–5.5 V rails depending on LOWDCR pin state and master configuration.

Applications

Telecom Base Station Power	Data Center VR13/VR14 CPU Core Rails
Use Scenario: High-density 48 V–to–1.8 V conversion delivering 120 A to ASIC/FPGA in 1U server blades. IC Role / Device Role / Timing Role: Slave controller extending phase count of LTC3884-1 master to 4-phase operation; synchronizes PWM timing via SYNC and PHASMD. Use Value: Enables 95%+ efficiency at full load using sub-milliohm DCR inductors, reducing board area and thermal management complexity versus discrete sense resistors.	Use Scenario: Multiphase core voltage regulation for Intel/AMD CPUs requiring tight transient response and <±5 mV output tolerance. IC Role / Device Role / Timing Role: Dual-channel slave managing two parallel phases under LTC3875 master control; uses ITH0/ITH1 to track master-set current demand in real time. Use Value: Achieves <3% phase current imbalance during 50 A/µs load steps-critical for meeting VR13/VR14 slew rate and droop specifications.
Industrial PLC Backplane Power	AI Accelerator Board Power
Use Scenario: 24 V–to–3.3 V/50 A distributed power rail for modular I/O modules operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Slave controller paired with LTC3877 master in 6-phase configuration; leverages RUN0/RUN1 for sequenced startup across multiple voltage domains. Use Value: Maintains stable current sharing across temperature via DCR-based sensing-avoids drift issues inherent in temperature-sensitive current sense resistors.	Use Scenario: 12 V–to–0.8 V/150 A supply for GPU/AI chips with aggressive transient requirements and strict EMI limits. IC Role / Device Role / Timing Role: Phase extender in 12-phase topology using four LTC3874IUF-1#TRPBF devices synchronized to single LTC3884-1 master clock. Use Value: Reduces input capacitor RMS current by 75% versus single-phase design-enables smaller, lower-cost ceramic input banks and meets Class B EMI standards.

Telecom Base Station Power

Data Center VR13/VR14 CPU Core Rails

Use Scenario: High-density 48 V–to–1.8 V conversion delivering 120 A to ASIC/FPGA in 1U server blades.

IC Role / Device Role / Timing Role: Slave controller extending phase count of LTC3884-1 master to 4-phase operation; synchronizes PWM timing via SYNC and PHASMD.

Use Value: Enables 95%+ efficiency at full load using sub-milliohm DCR inductors, reducing board area and thermal management complexity versus discrete sense resistors.

Use Scenario: Multiphase core voltage regulation for Intel/AMD CPUs requiring tight transient response and <±5 mV output tolerance.

IC Role / Device Role / Timing Role: Dual-channel slave managing two parallel phases under LTC3875 master control; uses ITH0/ITH1 to track master-set current demand in real time.

Use Value: Achieves <3% phase current imbalance during 50 A/µs load steps-critical for meeting VR13/VR14 slew rate and droop specifications.

Industrial PLC Backplane Power

AI Accelerator Board Power

Use Scenario: 24 V–to–3.3 V/50 A distributed power rail for modular I/O modules operating in −40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Slave controller paired with LTC3877 master in 6-phase configuration; leverages RUN0/RUN1 for sequenced startup across multiple voltage domains.

Use Value: Maintains stable current sharing across temperature via DCR-based sensing-avoids drift issues inherent in temperature-sensitive current sense resistors.

Use Scenario: 12 V–to–0.8 V/150 A supply for GPU/AI chips with aggressive transient requirements and strict EMI limits.

IC Role / Device Role / Timing Role: Phase extender in 12-phase topology using four LTC3874IUF-1#TRPBF devices synchronized to single LTC3884-1 master clock.

Use Value: Reduces input capacitor RMS current by 75% versus single-phase design-enables smaller, lower-cost ceramic input banks and meets Class B EMI standards.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3874EUF-1#TRPBF	Same silicon, rated for 0°C to 85°C junction temperature; lacks guaranteed performance over full −40°C to +125°C range.	Suitable for commercial-grade systems without extended temperature requirements.	Select when cost sensitivity outweighs industrial temperature qualification needs.
LTC3875IUFD#TRPBF	Single-chip 6-phase master controller with integrated gate drivers; no external master required, but lacks sub-milliohm DCR optimization.	Replaces master+slave architecture with monolithic solution-reduces component count but increases layout complexity for >6 phases.	Choose for new designs targeting ≤6 phases where board space and BOM count are prioritized over ultimate DCR sensing resolution.

Compared with LTC3874EUF-1#TRPBF, the LTC3874IUF-1#TRPBF guarantees operation from −40°C to +125°C, making it suitable for harsh environments; compared with LTC3875IUFD#TRPBF, it retains superior sub-milliohm DCR sensing fidelity and scalability beyond 6 phases when used with compatible masters.

Availability

LTC3874IUF-1#TRPBF is available at Aetrix Electronics and suitable for telecom base station power, AI accelerator board power, and industrial PLC backplane power requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3874IUF-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and communications markets.

The LTC3874IUF-1#TRPBF belongs to the PolyPhase® multiphase controller product line, engineered specifically for high-current, low-voltage DC/DC conversion in datacom, telecom, and AI infrastructure where efficiency, thermal density, and phase scalability are critical.

FAQ

What is the primary function of the LTC3874IUF-1#TRPBF in a power system?

The LTC3874IUF-1#TRPBF functions exclusively as a dual-phase synchronous step-down slave controller-it does not regulate output voltage independently. Instead, it extends phase count and shares current under command of a master controller (e.g., LTC3884-1) by tracking the master's ITH voltage and synchronizing PWM timing via SYNC and PHASMD pins. The LTC3874IUF-1#TRPBF relies entirely on the master for voltage feedback, soft-start, and fault management.

How does the LOWDCR pin affect current sensing performance in the LTC3874IUF-1#TRPBF?

The LOWDCR pin on the LTC3874IUF-1#TRPBF enables or disables the proprietary sub-milliohm DCR sensing path. When pulled high (e.g., tied to INTVCC), it activates an enhanced signal-to-noise ratio circuit that supports accurate current measurement down to 0.2 mΩ inductor DCR. When pulled low, the LTC3874IUF-1#TRPBF reverts to conventional DCR sensing with higher current threshold ranges and wider common-mode input (0–5.5 V), but loses the 14 dB SNR advantage.

Can the LTC3874IUF-1#TRPBF operate without a master controller?

No-the LTC3874IUF-1#TRPBF cannot operate autonomously. It lacks voltage feedback, error amplifier, and reference circuitry required for closed-loop output regulation. All critical control signals-including ITH voltage, RUN enable, SYNC clock, and fault responses-are sourced from a companion master controller such as LTC3884-1, LTC3875, or LTC3774. Without a master, the LTC3874IUF-1#TRPBF remains nonfunctional.

What are the absolute maximum ratings for the ISENSE pins on the LTC3874IUF-1#TRPBF?

The absolute maximum rating for ISENSE0+/ISENSE0− and ISENSE1+/ISENSE1− pins on the LTC3874IUF-1#TRPBF is −0.3 V to INTVCC. Exceeding this range risks permanent damage. Under normal operation, the common-mode voltage must stay within 0–3.5 V (LOWDCR = INTVCC) or 0–5.5 V (LOWDCR = GND), and differential voltage must remain below 100 mV to avoid comparator saturation or inaccurate current limiting.

How is switching frequency programmed on the LTC3874IUF-1#TRPBF when not using the SYNC pin?

When the SYNC pin is unused (tied to GND), the LTC3874IUF-1#TRPBF uses its FREQ pin to set switching frequency. A precision 10 µA current sinks from FREQ; connecting a resistor R_FREQ from FREQ to GND generates a voltage V_FREQ = 10 µA × R_FREQ, which determines frequency per the datasheet curve (e.g., 500 kHz at V_FREQ = 0.9 V). The LTC3874IUF-1#TRPBF supports 250 kHz–1 MHz via this method.

LTC3874IUF-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: PolyPhase®

Package/Case:: 24-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 2

Output Phases:: 2

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 38V

Frequency - Switching:: 250kHz ~ 1MHz

Duty Cycle (Max):: -

Synchronous Rectifier:: Yes

Clock Sync:: Yes

Serial Interfaces:: -

Control Features:: Current Limit, Enable, Frequency Control, Phase Control

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-QFN (4x4)

LTC3874IUF-1#TRPBF FAQ

1.How can I place an order for LTC3874IUF-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3874IUF-1#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LTC3874IUF-1#TRPBF reliable?

The price and inventory of LTC3874IUF-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3874IUF-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3874IUF-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3874IUF-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3874IUF-1#TRPBF?

LTC3874IUF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3874IUF-1#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LTC3874IUF-1#TRPBF?

For technical support, including LTC3874IUF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3874IUF-1#TRPBF requirements.

6.How does Aetrix verify that LTC3874IUF-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3874IUF-1#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3874IUF-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3874IUF-1#TRPBF?

All LTC3874IUF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3874IUF-1#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LTC3874IUF-1#TRPBF part is unused and in its original packaging.

Return procedure for LTC3874IUF-1#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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