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Analog Devices Inc. LTC3676EUJ#TRPBF
- Part No.:
- LTC3676EUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3676EUJ#TRPBF.pdf
- Description:
- IC REG CONV I.MX6 7OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,306
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Product details
Overview
LTC3676EUJ#TRPBF from Analog Devices is a highly integrated power management IC for application processors, featuring four synchronous step-down DC/DC converters (2.5A, 2.5A, 1.5A, 1.5A), three 300mA LDOs, I²C programmability, and DDR termination support (VTT/VTTR). It delivers precise multi-rail power sequencing for i.MX, OMAP, and ARM-based portable systems in automotive infotainment and industrial handheld devices.
For engineers reviewing the LTC3676EUJ#TRPBF datasheet, LTC3676EUJ#TRPBF pinout, LTC3676EUJ#TRPBF application, or LTC3676EUJ#TRPBF equivalent, key selection criteria include quad-buck current capability, I²C-configurable voltage scaling, ±1.5A DDR buck (LTC3676-1 variant), 12µA standby current, and QFN-40 package thermal performance (θJA = 33°C/W).
Technical Context
The LTC3676EUJ#TRPBF implements independent PWM control per buck regulator with selectable 1.125MHz/2.25MHz switching frequency and Burst Mode® operation for ultra-low quiescent current. Its I²C interface supports dynamic voltage scaling, autonomous power-down sequencing, and real-time status reporting across all eight regulated rails.
It integrates pushbutton ON/OFF control with programmable timing (e.g., 400ms WAKE assertion on ON low), VSTB-triggered dual DAC register banks for run/standby rail reconfiguration, and hardware fault monitoring via open-drain IRQ, PGOOD, and RSTO outputs - all coordinated through a unified power-on reset and sequencing engine.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion and USB-powered systems without external pre-regulation. |
| Buck Regulator Outputs | Four channels: two 2.5A (Buck 3/4), two 1.5A (Buck 1/2) - sufficient for SoC core, memory, I/O, and system rails. |
| LDO Outputs | Three 300mA LDOs (LDO2–LDO4), plus always-on 25mA LDO1 - enables low-noise analog supply and RTC backup. |
| DDR Support | VTT (±1.5A) and VTTR (0.5×VDDQIN, ±10mA) - meets JEDEC DDR3/DDR4 termination requirements. |
| Quiescent Current | 12µA in standby - extends battery life in always-on system states. |
| Switching Frequency | Selectable 1.125MHz or 2.25MHz - balances efficiency, component size, and EMI in compact layouts. |
| I²C Address | 0111100[R/W] - standard 7-bit address enabling multi-device bus configuration without conflict. |
Pinout & Package
Package: 40-lead 6mm × 6mm plastic QFN (UJ) with exposed thermal pad (Pin 41 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity (θJA = 33°C/W, θJC = 2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1–SW4 | Buck switch node outputs | Connect to inductor high-side; drive internal PMOS/NMOS power stages for each buck channel. |
| FB_B1–FB_B4 | Buck feedback inputs | Resistor-divider inputs setting output voltage via 725mV internal reference (±1.25% tolerance). |
| LDO1–LDO4 | LDO regulated outputs | LDO1 is always-on (25mA); LDO2/LDO4 adjustable; LDO3 fixed 1.8V - decoupled with ≥1µF ceramic caps. |
| VIN, PVIN1–PVIN4 | Main and per-regulator input supplies | VIN powers logic and LDOs; PVINx pins feed respective buck regulators - bypassed with ≥10µF ceramics. |
| EN_B1–EN_B4, EN_L2–EN_L4 | Enable inputs | Active-high digital enables with weak internal pull-downs - supports pin-strapped or I²C-controlled startup sequencing. |
| SDA, SCL, DVDD | I²C interface | DVDD sets logic level (1.6–5.5V); SDA/SCL support 400kHz Fast Mode - enables full rail configuration and status readback. |
| VSTB, PWR_ON, ON, WAKE, IRQ | System control signals | VSTB toggles between run/standby DAC registers; PWR_ON acknowledges boot; ON accepts pushbutton; WAKE/IRQ are open-drain status outputs. |
| VTTR, VDDQIN | DDR reference interface | VDDQIN senses DDR VDD; VTTR provides buffered 0.5×VDDQIN reference - only active in LTC3676-1 variant (confirmed by part number suffix). |
Key Features
| Feature | Design Value |
|---|---|
| I²C-programmable voltage scaling | Enables dynamic adjustment of all buck and LDO outputs during operation - critical for processor DVFS in mobile SoCs. |
| Autonomous power-down sequencing | Hardware-controlled shutdown sequence triggered by PWR_ON deassertion or I²C command - eliminates firmware dependency for safe rail collapse. |
| VSTB-driven dual DAC banks | Allows simultaneous reconfiguration of up to four rails between run and standby voltages - reduces wake latency in low-power states. |
| Pushbutton interface with timing control | ON pin supports configurable long-press detection (e.g., 10s hard reset) and debounced wake initiation - simplifies mechanical UI integration. |
| Integrated DDR termination | VTT buck delivers ±1.5A sink/source with tight regulation; VTTR provides precision 0.5×VDDQIN reference - meets DDR3/DDR4 VREF accuracy specs. |
Applications
| Mobile Application Processors | Automotive Infotainment |
|---|---|
Use Scenario: Powering Freescale i.MX6 or ARM Cortex-A series SoCs in tablets and handheld scanners. IC Role / Device Role / Timing Role: Central PMIC managing eight independent rails (core, GPU, DDR, I/O, analog) with synchronized startup and I²C-configurable DVFS. Use Value: Eliminates discrete regulator count by >70%; reduces BOM cost and board area while enabling adaptive power states per processor workload. | Use Scenario: Supplying head-unit processors, display controllers, and audio codecs in AEC-Q100-compliant vehicle systems. IC Role / Device Role / Timing Role: Automotive-grade power manager delivering DDR3 termination (VTT/VTTR), watchdog LDO (LDO1), and fault-monitored sequencing. Use Value: Meets automotive temperature range (–40°C to 125°C) and reliability requirements without external supervision circuitry. |
| Industrial Handheld Instruments | Portable Medical Devices |
Use Scenario: Powering FPGA-based data acquisition units and barcode scanners requiring stable multi-rail supplies. IC Role / Device Role / Timing Role: Single-chip solution providing isolated, low-noise LDOs for analog front-ends and high-current bucks for digital subsystems. Use Value: 12µA standby current extends battery life; programmable soft-start prevents inrush-induced brownouts during cold start. | Use Scenario: Supporting portable ultrasound or patient monitors with real-time clock, sensor interfaces, and display backlights. IC Role / Device Role / Timing Role: Always-on LDO1 (25mA) powers RTC and wake logic; LDO2/LDO3 supply ADCs and op-amps; buck regulators drive displays and wireless radios. Use Value: Low dropout (280mV @ 300mA) and <0.05% load regulation ensure signal integrity in sensitive analog measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS659122YFFT | 6-buck + 10-LDO architecture; no integrated DDR termination; SPI interface only (no I²C) | Targets TI Sitara AMx processors; lacks VTT/VTTR for DDR memory interfaces | Choose when using TI ecosystem and requiring higher LDO count but no DDR support. |
| MAX20029ATG/V+T | 4-buck + 3-LDO; AEC-Q100 qualified; includes CAN transceiver; no I²C or DDR features | Designed for automotive body electronics; integrates CAN PHY but omits VTT/VTTR and programmable sequencing | Prefer for CAN-connected modules where DDR termination is unnecessary and CAN interface is required. |
Compared with TPS659122YFFT and MAX20029ATG/V+T, the LTC3676EUJ#TRPBF uniquely combines DDR3/DDR4 termination (VTT/VTTR), I²C configurability, and sub-15µA standby - making it optimal for application-processor-based portable and automotive infotainment systems requiring JEDEC-compliant memory power.
Availability
LTC3676EUJ#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial handheld instruments, and portable medical devices requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LTC3676EUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3676 product line is designed specifically for advanced portable application processors - integrating multi-rail DC/DC conversion, DDR termination, and intelligent sequencing into a single compact package for space-constrained, battery-sensitive systems.
FAQ
What is the operating temperature range for the LTC3676EUJ#TRPBF?
The LTC3676EUJ#TRPBF is rated for –40°C to 125°C junction temperature. This industrial-grade specification ensures reliable operation in demanding environments such as automotive infotainment head-units and portable industrial test equipment where ambient temperatures fluctuate widely. The device uses thermal shutdown protection and is validated per Analog Devices' characterization protocols across this full range.
Does the LTC3676EUJ#TRPBF support DDR memory termination?
No - the LTC3676EUJ#TRPBF is the base LTC3676 variant and does not include DDR termination. Only the LTC3676-1 family (e.g., LTC3676EUJ-1#TRPBF) integrates the ±1.5A VTT buck and VTTR reference. The LTC3676EUJ#TRPBF datasheet explicitly excludes VTTR and VDDQIN pins from its pinout and functional description, confirming absence of DDR-specific circuitry.
How many independent power rails does the LTC3676EUJ#TRPBF provide?
The LTC3676EUJ#TRPBF provides eight independent regulated rails: four synchronous step-down DC/DC converters (two 2.5A, two 1.5A), three 300mA LDOs (LDO2–LDO4), and one always-on 25mA LDO (LDO1). Each rail has dedicated enable, feedback, and input pins - enabling fully independent voltage programming, sequencing, and fault monitoring via I²C or pin-strapping.
What package type and thermal characteristics apply to the LTC3676EUJ#TRPBF?
The LTC3676EUJ#TRPBF uses a 40-lead 6mm × 6mm plastic QFN (UJ package) with exposed thermal pad (Pin 41 = GND). Its thermal resistance is θJA = 33°C/W and θJC = 2°C/W when the exposed pad is properly soldered to a PCB ground plane - enabling efficient heat dissipation in high-density portable designs without additional heatsinking.
Can the LTC3676EUJ#TRPBF be used with i.MX6 processors?
Yes - the LTC3676EUJ#TRPBF is explicitly designed to support Freescale i.MX6 processors. Its eight-rail architecture matches i.MX6 power requirements: core (ARM), GPU, DDR I/O, SoC, analog, RTC, and peripheral rails. The device's I²C interface enables full DVFS coordination with i.MX6's power management controller, and its pin-strappable sequencing aligns with i.MX6 boot timing specifications.
LTC3676EUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, i.MX6
- Voltage - Input:
- 2.7V ~ 5.5V
- Number of Outputs:
- 7
- Voltage - Output:
- Adjustable
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3676EUJ#TRPBF FAQ
1.How can I place an order for LTC3676EUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3676EUJ#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 LTC3676EUJ#TRPBF reliable?
The price and inventory of LTC3676EUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3676EUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3676EUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3676EUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3676EUJ#TRPBF?
LTC3676EUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3676EUJ#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 LTC3676EUJ#TRPBF?
For technical support, including LTC3676EUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3676EUJ#TRPBF requirements.
6.How does Aetrix verify that LTC3676EUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3676EUJ#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 LTC3676EUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3676EUJ#TRPBF?
All LTC3676EUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3676EUJ#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 LTC3676EUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC3676EUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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