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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Analog Devices Inc. LTC3676HLXE-1#PBF

Name: LTC3676HLXE-1#PBF
Brand: Analog Devices Inc.
SKU: LTC3676HLXE-1#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3676HLXE-1#PBF

Manufacturer:: Analog Devices Inc.

Category:: Special Purpose Regulators

Package:: 48-LQFP Exposed Pad

Datasheet:: LTC3676HLXE-1#PBF.pdf

Description:: IC REG CONV I.MX6 7OUT 48ELQFP

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Product details

Overview

LTC3676HLXE-1#PBF from Analog Devices is a high-integration power management IC for application processors, featuring four synchronous buck converters (2.5A, 2.5A, 1.5A, 1.5A), three 300mA LDOs (two adjustable), DDR termination support (±1.5A VTT + VTTR reference), I²C programmable sequencing, and automotive-grade operation up to 150°C junction temperature. It targets i.MX6, ARM Cortex, and OMAP-based portable systems requiring multi-rail precision power delivery.

For engineers reviewing the LTC3676HLXE-1#PBF datasheet, LTC3676HLXE-1#PBF pinout, LTC3676HLXE-1#PBF application, or LTC3676HLXE-1#PBF equivalent, key selection criteria include DDR-compliant VTTR/VTT accuracy (±1% at 0.5×VDDQIN), I²C-configurable dynamic voltage scaling across all bucks, autonomous power-down control, ±1.5A VTT sink/source capability, and AEC-Q100 qualification for infotainment and ADAS subsystems.

Technical Context

The LTC3676HLXE-1#PBF integrates two 2.5A and two 1.5A synchronous step-down regulators with selectable 1.125MHz/2.25MHz switching frequency, enabling optimized efficiency vs. size trade-offs. Each buck uses internal PMOS/NMOS switches with verified on-resistance (120mΩ/70mΩ for 2.5A rails; 160mΩ/80mΩ for 1.5A rails) and supports soft-start via feedback pin ramping (0.8V/ms).

It implements a dedicated DDR power architecture: Buck 1 delivers ±1.5A VTT with VTTR buffered to 0.5×VDDQIN (±1% tolerance), while LDO2–LDO4 provide low-noise analog supplies (1.8V fixed, two adjustable via 725mV reference). System control includes pushbutton ON/OFF, WAKE/IRQ status signaling, and I²C register access for real-time voltage monitoring and sequencing configuration.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.7V to 5.5V - supports single-cell Li-ion or USB-powered systems without external pre-regulation.
Buck Output Currents	2.5A (Buck 3 & 4), 1.5A (Buck 1 & 2) - sufficient for SoC core, memory, I/O, and DDR termination rails.
VTT/VDDR Support	±1.5A VTT sink/source + VTTR = 0.5×VDDQIN (±1%) - meets JEDEC DDR3/DDR4 termination requirements.
LDO Outputs	Three 300mA LDOs: LDO3 fixed at 1.8V; LDO2/LDO4 adjustable via 725mV feedback reference.
Control Interface	I²C (400kHz, 7-bit address 0x7D for LTC3676-1) - enables dynamic voltage scaling, sequencing, and fault reporting.
Operating Temperature	–40°C to +150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive applications.
Package	48-lead eLQFP (7mm × 7mm, exposed pad) - provides thermal performance (θJA = 19°C/W) for high-power density layouts.

Pinout & Package

Package: 48-lead exposed-pad plastic eLQFP (7mm × 7mm), RoHS-compliant, with exposed pad soldered to PCB ground for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Main input supply rail	Primary 2.7–5.5V input powering all PVIN pins and internal circuitry; requires ≥1µF ceramic bypass.
PVIN1–PVIN4	Per-buck power inputs	Independent high-current inputs for each buck stage; each requires ≥10µF ceramic bulk capacitance.
SW1–SW4	Buck switch node outputs	Connect to inductor high-side terminals; drive external power inductors for DC/DC conversion.
FB_B1–FB_B4	Buck feedback inputs	Resistor-divider inputs setting output voltages; reference = 725mV (buck 1–4) with 12.5mV LSB resolution.
LDO1–LDO4	LDO output terminals	LDO1: always-on 25mA rail; LDO2/LDO4: adjustable 300mA; LDO3: fixed 1.8V/300mA.
VDDQIN / VTTR	DDR reference interface	VDDQIN senses DDR VDD supply; VTTR delivers buffered 0.5×VDDQIN reference for DDR termination.
EN_B1–EN_B4 / EN_L2–EN_L4	Enable inputs	Active-high logic enables; weak internal pull-downs allow pin-strapped startup sequencing.
I²C (SDA/SCL)	Serial control interface	400kHz I²C bus (DVDD-referenced) for configuring voltages, modes, sequencing, and reading status registers.

Key Features

Feature	Design Value
DDR Power Solution	Integrated ±1.5A VTT regulator + VTTR reference eliminates need for discrete DDR termination ICs.
I²C Programmable Sequencing	Full control over power-up/down order, voltage levels, DVS steps, and autonomous shutdown timing via 7-bit address 0x7D.
Always-On 25mA LDO	LDO1 remains active during system standby (12µA VIN quiescent current), supporting RTC or watchdog MCU operation.
Pushbutton System Control	ON, PWR_ON, WAKE, and IRQ pins enable hardware-initiated power-on, reset, and wake-up without host processor involvement.
AEC-Q100 Qualified	Rated for –40°C to +150°C junction temperature with automotive reliability testing - suitable for infotainment head units and telematics modules.

Applications

Automotive Infotainment	Industrial Handheld Scanners
Use Scenario: Powering i.MX6-based head unit with DDR3 memory, display interface, audio codec, and CAN controller. IC Role / Device Role / Timing Role: Central PMIC delivering eight independent rails: core (1.2V/2.5A), DDR (1.5V/2.5A + VTT/VTTR), analog (1.8V/300mA), and always-on RTC (3V/25mA). Use Value: Eliminates six discrete regulators; VTTR accuracy (±1%) ensures DDR signal integrity; AEC-Q100 grade guarantees operation in 105°C cabin environments.	Use Scenario: Battery-powered rugged scanner with ARM Cortex-A9 SoC, CMOS image sensor, and laser driver. IC Role / Device Role / Timing Role: Single-chip power solution managing SoC core/memory/I/O rails, sensor bias (1.8V), and laser diode driver supply (2.5V/1.5A). Use Value: 12µA standby current extends battery life; I²C DVS reduces dynamic power during barcode decode; 48-pin LQFP simplifies layout vs. QFN in high-vibration assemblies.
Medical Point-of-Care Monitor	High-End Consumer Tablet
Use Scenario: Portable ECG monitor with low-noise analog front-end, touch controller, and wireless BLE module. IC Role / Device Role / Timing Role: Supplies clean 1.8V (LDO3) for ADC reference, 3.3V (LDO2) for touch IC, 1.2V (Buck 2) for SoC, and 2.5V (Buck 4) for BLE radio. Use Value: Three low-PSRR LDOs minimize switching noise coupling into analog rails; 0.01%/V line regulation ensures stable sensor bias under battery droop.	Use Scenario: Premium tablet using OMAP5 SoC with dual-channel DDR3L, HDMI transmitter, and stereo audio DAC. IC Role / Device Role / Timing Role: Delivers DDR3L VDDQ (1.35V/2.5A), VTT (±1.5A), VTTR (0.675V), SoC core (1.1V/2.5A), and GPU (1.0V/1.5A). Use Value: VTTR tracking error <±10mV ensures DDR3L compliance; burst-mode operation achieves >85% efficiency at 10mA load for ultra-low idle power.

Automotive Infotainment

Industrial Handheld Scanners

Use Scenario: Powering i.MX6-based head unit with DDR3 memory, display interface, audio codec, and CAN controller.

IC Role / Device Role / Timing Role: Central PMIC delivering eight independent rails: core (1.2V/2.5A), DDR (1.5V/2.5A + VTT/VTTR), analog (1.8V/300mA), and always-on RTC (3V/25mA).

Use Value: Eliminates six discrete regulators; VTTR accuracy (±1%) ensures DDR signal integrity; AEC-Q100 grade guarantees operation in 105°C cabin environments.

Use Scenario: Battery-powered rugged scanner with ARM Cortex-A9 SoC, CMOS image sensor, and laser driver.

IC Role / Device Role / Timing Role: Single-chip power solution managing SoC core/memory/I/O rails, sensor bias (1.8V), and laser diode driver supply (2.5V/1.5A).

Use Value: 12µA standby current extends battery life; I²C DVS reduces dynamic power during barcode decode; 48-pin LQFP simplifies layout vs. QFN in high-vibration assemblies.

Medical Point-of-Care Monitor

High-End Consumer Tablet

Use Scenario: Portable ECG monitor with low-noise analog front-end, touch controller, and wireless BLE module.

IC Role / Device Role / Timing Role: Supplies clean 1.8V (LDO3) for ADC reference, 3.3V (LDO2) for touch IC, 1.2V (Buck 2) for SoC, and 2.5V (Buck 4) for BLE radio.

Use Value: Three low-PSRR LDOs minimize switching noise coupling into analog rails; 0.01%/V line regulation ensures stable sensor bias under battery droop.

Use Scenario: Premium tablet using OMAP5 SoC with dual-channel DDR3L, HDMI transmitter, and stereo audio DAC.

IC Role / Device Role / Timing Role: Delivers DDR3L VDDQ (1.35V/2.5A), VTT (±1.5A), VTTR (0.675V), SoC core (1.1V/2.5A), and GPU (1.0V/1.5A).

Use Value: VTTR tracking error <±10mV ensures DDR3L compliance; burst-mode operation achieves >85% efficiency at 10mA load for ultra-low idle power.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail power management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS659122ZQV	6-buck + 8-LDO PMIC; no integrated VTT/VTTR; I²C address 0x58; max junction temp 105°C.	Requires external DDR termination IC; suited for non-automotive consumer tablets with lower thermal demands.	Select when needing more LDOs but no DDR-specific rails; verify external VTT solution adds board area and BOM cost.
MAX20029ATI+T	4-buck + 3-LDO; AEC-Q100 Grade 0 (–40°C to +125°C); no VTTR; I²C address 0x60; VTT ±1.2A only.	Lacks VTTR buffer; VTT current limited to ±1.2A - insufficient for DDR4 high-speed interfaces.	Choose for cost-sensitive automotive clusters where DDR3 (not DDR4) is used and VTTR is generated externally.

Compared with TPS659122ZQV and MAX20029ATI+T, the LTC3676HLXE-1#PBF uniquely integrates automotive-grade DDR3/DDR4-compliant VTTR and ±1.5A VTT in a single package, eliminating external components while maintaining 150°C operation - critical for compact, thermally constrained infotainment modules.

Availability

LTC3676HLXE-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial handheld scanners, and medical point-of-care monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC3676HLXE-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, Inc. 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 LTC3676 product line delivers highly integrated, I²C-programmable power management solutions for application processors in space-constrained, thermally demanding environments - specifically targeting automotive infotainment, portable medical, and rugged industrial computing.

FAQ

What is the function of the VTTR pin on the LTC3676HLXE-1#PBF?

The VTTR pin on the LTC3676HLXE-1#PBF provides a buffered, high-accuracy reference voltage equal to exactly one-half of the VDDQIN voltage (0.5×VDDQIN), with ±1% tolerance across temperature and load. This output directly supports JEDEC-compliant DDR3/DDR4 termination schemes and eliminates the need for an external resistor divider or op-amp buffer. The LTC3676HLXE-1#PBF uses this pin exclusively in its -1 variant to ensure precise DDR VREF generation.

Does the LTC3676HLXE-1#PBF support dynamic voltage scaling (DVS) for all four buck regulators?

Yes, the LTC3676HLXE-1#PBF supports full I²C-controlled dynamic voltage scaling for all four buck regulators via dedicated DVBxA/DVBxB registers. Each buck's output voltage can be adjusted in 12.5mV steps across its full range (e.g., 0.4V to 3.6V), enabling real-time optimization of SoC core, memory, and I/O rail voltages during different operational states. This capability is implemented in the LTC3676HLXE-1#PBF firmware and confirmed in the device's control register map.

What is the maximum junction temperature rating for the LTC3676HLXE-1#PBF, and how is it validated?

The LTC3676HLXE-1#PBF is rated for a maximum junction temperature of +150°C and is fully guaranteed over the –40°C to +150°C operating junction temperature range per Analog Devices' H-grade qualification. This rating is validated through design correlation, statistical process controls, and extended environmental stress testing - including high-temperature operating life (HTOL) and temperature cycling - meeting AEC-Q100 Rev H requirements. The LTC3676HLXE-1#PBF datasheet specifies θJA = 19°C/W for the 48-lead eLQFP package.

How does the LTC3676HLXE-1#PBF handle power sequencing without I²C communication?

The LTC3676HLXE-1#PBF supports pin-strapped power sequencing by connecting the enable outputs (EN_B1–EN_B4, EN_L2–EN_L4) to downstream regulator inputs or other EN pins in the desired startup order. Each enable pin has a weak internal pull-down, allowing simple resistor-based delay networks or RC timing circuits to enforce staggered turn-on. This method operates independently of I²C and is fully functional in the LTC3676HLXE-1#PBF, as documented in the "Independent Enable Pin-Strap or I²C Sequencing" feature list.

Is the LTC3676HLXE-1#PBF pin-compatible with the standard LTC3676HLXE#PBF?

No, the LTC3676HLXE-1#PBF is not pin-compatible with the LTC3676HLXE#PBF. The -1 variant replaces LDO4 with VTTR/VDDQIN functionality: Pin 9 is VTTR (not FB_L4), Pin 10 is VDDQIN (not EN_L4), and Pin 7 remains VIN_L4 but is unused in -1 mode. These pin function changes require PCB layout revision. The LTC3676HLXE-1#PBF datasheet explicitly defines this alternate pin mapping for DDR-optimized applications.

LTC3676HLXE-1#PBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 48-LQFP Exposed Pad

Packaging:: Tray

Product Status:: Active

Applications:: Converter, i.MX6

Voltage - Input:: 2.7V ~ 5.5V

Number of Outputs:: 7

Voltage - Output:: Adjustable

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-LQFP-EP (7x7)

LTC3676HLXE-1#PBF FAQ

1.How can I place an order for LTC3676HLXE-1#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3676HLXE-1#PBF 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 LTC3676HLXE-1#PBF reliable?

The price and inventory of LTC3676HLXE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3676HLXE-1#PBF is usually 5 days.

3.What payment methods are accepted for LTC3676HLXE-1#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3676HLXE-1#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3676HLXE-1#PBF?

LTC3676HLXE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3676HLXE-1#PBF 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 LTC3676HLXE-1#PBF?

For technical support, including LTC3676HLXE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3676HLXE-1#PBF requirements.

6.How does Aetrix verify that LTC3676HLXE-1#PBF is sourced from the original manufacturer or authorized distributors?

All LTC3676HLXE-1#PBF 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 LTC3676HLXE-1#PBF meets industry standards.

7.What is the process for return or replacement of LTC3676HLXE-1#PBF?

All LTC3676HLXE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3676HLXE-1#PBF, 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 LTC3676HLXE-1#PBF part is unused and in its original packaging.

Return procedure for LTC3676HLXE-1#PBF:

1.Submit a request within 90 days.

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

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