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LTC3676EUJ#TRPBF

4-channel DC-DC PMIC for i.MX, 2x buck 2.5A, 2x buck 1A, QFN-40

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Manufacturer Part：

LTC3676EUJ#TRPBF

Package：

QFN-40 (6x6mm)

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Description

Product Overview

The LTC3676EUJ#TRPBF from Analog Devices is a 4-channel PMIC with two 2.5A bucks and two 1A bucks, designed to power i.MX processors in portable devices with I2C control and power sequencing.

Key Specifications

Package QFN-40 (6x6mm)

Features

  • See datasheet for complete specifications
  • Industry-standard package

Applications

  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Automotive electronics

The LTC3676EUJ#TRPBF from Analog Devices is a 4-channel PMIC with two 2.5A bucks and two 1A bucks, designed to power i.MX processors in portable devices with I2C control and power sequencing.

The LTC3676EUJ#TRPBF is a 4-channel DC-DC PMIC (Power Management IC) from Analog Devices in QFN-40 (6x6mm), designed to power Freescale/NXP i.MX application processors. It integrates: two 2.5A step-down buck regulators (Buck1, Buck2) for core and DDR rails; two 1A step-down buck regulators (Buck3, Buck4) for I/O and peripheral rails; and four 300mA LDO regulators (LDO1-4) for low-noise analog and PLL supplies. Each buck regulator uses constant-on-time (COT) control with valley current mode, providing fast transient response (typical 5us from 10% to 90% load step) essential for processor core rails. The switching frequency is 2.25MHz, allowing small 0.47-2.2uH inductors in 0805 or 1008 footprint. All regulators are programmable via I2C (400kHz), allowing dynamic voltage scaling (DVS): the I2C interface can adjust output voltages in 25mV steps during operation, enabling DVFS (Dynamic Voltage and Frequency Scaling) for power savings. The WAKE pin initiates power-up sequencing: a LOW-to-HIGH transition starts the pre-programmed power-up sequence (Buck1 first, then Buck2, then LDOs). The PGOOD pin indicates all rails are within regulation. Each regulator has independent enable pins (EN1-4) for manual control. The device supports multiple operating states: RUN (all rails active), STANDBY (LDOs only), and SHUTDOWN (all off, 10uA Iq). The I2C registers store configuration, fault status, and voltage settings. The -EUJ suffix specifies QFN-40, and #TRPBF specifies tape-and-reel, lead-free.

Pin Name Type Function
1-4 SW1/BOOT1/PVIN1/EN1 I/O/Power Buck1 switch node / bootstrap / input / enable
5-8 SW2/BOOT2/PVIN2/EN2 I/O/Power Buck2 switch node / bootstrap / input / enable
9-12 SW3/BOOT3/PVIN3/EN3 I/O/Power Buck3 switch node / bootstrap / input / enable
13-16 SW4/BOOT4/PVIN4/EN4 I/O/Power Buck4 switch node / bootstrap / input / enable
17-20 LDO1/LDO2/LDO3/LDO4 Output Four linear regulator outputs (1.2V-3.3V)
21-24 VINA/SCL/SDA/WAKE Power/I/O Analog supply / I2C clock / I2C data / wake input
25-40 PGOOD/VFB1-4/GND/Exposed Pad Output/Power Power good / feedback / ground / thermal pad
  • Industrial control
  • Consumer electronics
  • Communication equipment
  • Automotive electronics
    • Manufacturer Part Number Package Notes
    Analog Devices LTC3676EUJ#TRPBF QFN-40 Same device, ADI brand
    Analog Devices LTC3675EUJ#PBF QFN-40 3 buck + 3 LDO version, slightly fewer rails
    Texas Instruments TPS65218D0 QFN-48 6-rail PMIC for Sitara, I2C controlled
    Richtek RT5028AGQW QFN-40 4 buck + 4 LDO PMIC for tablet, similar
    NXP PF0100F2AEP BGA-56 Multi-rail PMIC for i.MX, similar complexity
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