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Analog Devices Inc. LTC3676HUJ#PBF
- Part No.:
- LTC3676HUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3676HUJ#PBF.pdf
- Description:
- IC REG CONV I.MX6 7OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
LTC3676HUJ#PBF 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 (two adjustable), I²C programmable voltage scaling and sequencing, and automotive-grade operation up to +150°C junction temperature. It delivers complete multi-rail power for i.MX, OMAP, and ARM-based portable systems with DDR termination support.
For engineers reviewing the LTC3676HUJ#PBF datasheet, LTC3676HUJ#PBF pinout, LTC3676HUJ#PBF application, or LTC3676HUJ#PBF equivalent, key selection considerations include its 40-lead 6mm × 6mm QFN package, ±1.5A DDR buck capability (LTC3676-1 variant), VSTB-controlled dual DAC voltage modes, pushbutton ON/OFF interface, and AEC-Q100 qualification for infotainment and telematics designs.
Technical Context
The LTC3676HUJ#PBF implements an I²C-configurable multi-regulator architecture with autonomous power sequencing via enable pin-strapping or register control. Its four buck regulators operate in Burst Mode®, pulse-skipping, or forced continuous mode, selectable per rail via BUCKx[2] bits, with switching frequencies of 1.125MHz or 2.25MHz.
It integrates dedicated DDR power functions: VTTR reference generation (0.5 × VDDQIN) and VTT termination (±1.5A) on the LTC3676-1 variant, while supporting dynamic voltage scaling across all DC/DC outputs using 12.5mV LSB DAC steps and programmable soft-start rates (0.8V/ms for bucks, 10V/ms for LDOs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, USB, or wide-input industrial supplies without external pre-regulation. |
| Buck Regulator Outputs | Four independent rails: two 2.5A (Buck 3/4), two 1.5A (Buck 1/2) - powers core, SoC, memory, and I/O domains simultaneously. |
| LDO Outputs | Three 300mA LDOs (LDO2–LDO4), plus always-on 25mA LDO1 - provides low-noise analog bias for sensors, ADCs, and RTCs. |
| Switching Frequency | Selectable 1.125MHz or 2.25MHz - enables compact 1.5µH inductors and minimizes EMI in space-constrained handhelds. |
| Standby Current | 12µA typical - sustains system wake logic during deep sleep without draining battery. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive infotainment and industrial edge computing environments. |
| I²C Address | 0111100[R/W] - standard 7-bit address enabling multi-device bus configuration without address conflict. |
Pinout & Package
Package: 40-lead 6mm × 6mm plastic QFN (UJ), exposed pad (Pin 41) tied to GND for thermal and electrical integrity. θJA = 33°C/W, θJC = 2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 27) | Main input supply rail | Primary 2.7–5.5V source for all PVIN inputs and internal circuitry; requires ≥1µF ceramic bypass. |
| PVIN1–PVIN4 (Pins 35, 42, 15, 16) | Independent buck input supplies | Enable separate input filtering per regulator; each requires ≥10µF ceramic capacitor for stability. |
| SW1–SW4 (Pins 31, 20, 33, 11) | Buck switch node outputs | Drive external inductors; high dV/dt nodes requiring tight layout and ground plane coupling. |
| FB_B1–FB_B4 (Pins 24, 25, 22, 23) | Buck feedback inputs | Resistor-divider inputs setting output voltage with 12.5mV LSB resolution and 0.8V/ms soft-start. |
| LDO1–LDO4 (Pins 28, 3, 4, 6) | LDO regulated outputs | LDO1 is always-on 25mA rail; LDO2/LDO4 are adjustable (725mV ref); LDO3 is fixed 1.8V. |
| VSTB (Pin 19) | Voltage standby mode select | Hardware-selectable dual DAC bank: low = DVBxA (run), high = DVBxB (standby) for dynamic voltage scaling. |
| ON (Pin 29) | Pushbutton interface input | Internal weak pull-up; ground activation initiates power-on sequence and generates WAKE signal. |
| PWR_ON (Pin 21) | Power-on handshaking output | Must be driven high within 5s of WAKE assertion to sustain power; drives low to initiate shutdown. |
| WAKE (Pin 33) | System wake-up open-drain output | Releases high upon ON press or PWR_ON assertion; used to enable downstream regulators or wake microcontrollers. |
| SDA/SCL (Pins 13, 14) | I²C serial interface | Level-shifted to DVDD (1.6–5.5V); supports 400kHz Fast Mode for real-time voltage/enable/status updates. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Buck + Triple LDO Integration | Eliminates need for 7 discrete regulators in application processor PMIC designs, reducing BOM count and PCB area by >40%. |
| I²C Programmable Sequencing & DVS | Enables precise power-up/down order and real-time voltage adjustment (e.g., CPU core scaling) without firmware changes. |
| VSTB-Controlled Dual DAC Banks | Allows hardware-triggered transition between run and standby voltage sets on up to four rails simultaneously. |
| DDR-Specific VTTR/VTT Support | LTC3676-1 variant provides buffered 0.5×VDDQIN reference and ±1.5A VTT termination for JEDEC-compliant DDR3/DDR4 memory interfaces. |
| Automotive AEC-Q100 Grade H | Qualified for full –40°C to +150°C junction operation - meets reliability requirements for automotive infotainment head units and ADAS domain controllers. |
| 12µA Standby Current | Extends battery life in always-listening portable devices (e.g., scanners, medical monitors) during extended idle periods. |
Applications
| Automotive Infotainment Head Unit | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powering i.MX6-based display/audio/Bluetooth subsystem with DDR3 memory and touch controller. IC Role / Device Role / Timing Role: Central PMIC managing eight independent rails: core (1.38V/2.5A), SoC (1.38V/1.5A), DDR (1.5V/2.5A + VTTR/VTT), and analog (1.8V/300mA LDO3). Use Value: AEC-Q100 qualification ensures reliability in vehicle cabin temperatures; VSTB pin enables seamless transition between active navigation and low-power audio playback modes. |
Use Scenario: Battery-powered barcode scanner with ARM Cortex-A9 processor, image sensor, and laser driver. IC Role / Device Role / Timing Role: Single-chip power solution delivering 2.5A core rail, 1.5A I/O rail, 300mA analog LDOs, and 25mA always-on RTC supply. Use Value: 12µA standby current extends 2000mAh Li-ion battery life to >12 months in shelf mode; pushbutton ON interface enables instant wake from deep sleep. |
| Portable Medical Monitor | High-End Consumer Tablet |
Use Scenario: Clinical-grade vital signs monitor requiring ultra-low-noise analog supplies for ECG/SpO₂ front-end and isolated digital processing. IC Role / Device Role / Timing Role: Provides clean 1.8V/300mA (LDO3) and 2.5V/300mA (LDO2) rails with <0.01%/V line regulation, plus 25mA always-on LDO1 for real-time clock. Use Value: Integrated LDOs eliminate external noise-sensitive regulators; 150°C max junction rating supports sealed enclosure thermal design. |
Use Scenario: Premium tablet with quad-core application processor, LPDDR4 memory, and high-resolution display backlight. IC Role / Device Role / Timing Role: Manages dynamic voltage scaling across CPU/GPU cores (via I²C), DDR4 termination (VTTR/VTT), and display power rails. Use Value: 2.25MHz switching frequency allows use of 1.5µH inductors, reducing solution size by 30% vs. 1MHz alternatives; programmable soft-start prevents inrush current during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS659122YFFR | 6-buck + 8-LDO architecture; 2.5V–5.5V input; no integrated DDR VTTR/VTT; I²C only (no pin-strap mode) | Targeted at TI Sitara AMx processors; lacks automotive temp grade and VSTB dual-DAC hardware control | Preferred when higher LDO count and TI ecosystem integration outweigh DDR-specific features. |
| MAX20029ATI+T | 4-buck + 3-LDO; AEC-Q100 Grade 0 (–40°C to +150°C); 2.7V–5.5V input; includes watchdog timer and fault logging | Optimized for ADAS camera modules; lacks VSTB pin and I²C programmable DVS; fixed 1.2V/1.8V/3.3V LDO outputs | Chosen for safety-critical vision systems requiring built-in diagnostics and ASIL-B support. |
Compared with TPS659122YFFR and MAX20029ATI+T, the LTC3676HUJ#PBF uniquely combines AEC-Q100 H-grade operation, hardware VSTB-triggered dual-voltage mode, and integrated DDR VTTR/VTT - making it optimal for cost-sensitive, thermally demanding automotive infotainment platforms requiring flexible voltage scaling without MCU intervention.
Availability
LTC3676HUJ#PBF is available at Aetrix Electronics and suitable for automotive infotainment, portable industrial scanners, and high-reliability medical monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3676HUJ#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.
The LTC3676 product line delivers highly integrated, application-processor-optimized power management ICs with emphasis on DDR compatibility, automotive reliability, and I²C configurability for portable and embedded systems.
FAQ
What is the maximum junction temperature specification for the LTC3676HUJ#PBF?
The LTC3676HUJ#PBF is rated for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive applications. This H-grade rating exceeds standard industrial (-40°C to +125°C) versions and enables deployment in under-dash infotainment systems where ambient temperatures exceed 105°C.
Does the LTC3676HUJ#PBF support DDR memory termination and reference generation?
The LTC3676HUJ#PBF is the base part number for the LTC3676 family; DDR-specific VTTR and VTT functionality is implemented in the LTC3676-1 variant (e.g., LTC3676HUJ-1#PBF). The LTC3676HUJ#PBF itself does not include VTTR/VTT circuitry - users requiring DDR support must select the -1 suffix version.
How does the VSTB pin function on the LTC3676HUJ#PBF?
The VSTB pin on the LTC3676HUJ#PBF selects between two independent DAC voltage banks: when pulled low, it activates the DVBxA registers (typically configured for active-run voltages); when pulled high, it forces use of DVBxB registers (typically configured for low-power standby voltages). This enables hardware-triggered dynamic voltage scaling across up to four buck regulators without I²C traffic.
What are the key differences between the LTC3676HUJ#PBF and the LTC3676IUJ#PBF?
The LTC3676HUJ#PBF and LTC3676IUJ#PBF share identical functionality and pinout but differ in temperature qualification: the 'H' grade is guaranteed over –40°C to +150°C junction temperature, while the 'I' grade is specified for –40°C to +125°C. Both use the same 40-lead 6mm × 6mm QFN package and support identical I²C commands, sequencing, and regulation features.
Can the LTC3676HUJ#PBF be used without I²C configuration?
Yes - the LTC3676HUJ#PBF supports full pin-strapped operation: enable states, output voltages (via resistor dividers on FB pins), and power-up sequencing can be set using external resistors and enable pin connections. I²C is optional and used only for dynamic reconfiguration, status monitoring, or advanced features like DVS and fault logging.
LTC3676HUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 40-QFN (6x6)
LTC3676HUJ#PBF FAQ
1.How can I place an order for LTC3676HUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3676HUJ#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 LTC3676HUJ#PBF reliable?
The price and inventory of LTC3676HUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3676HUJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC3676HUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3676HUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3676HUJ#PBF?
LTC3676HUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3676HUJ#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 LTC3676HUJ#PBF?
For technical support, including LTC3676HUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3676HUJ#PBF requirements.
6.How does Aetrix verify that LTC3676HUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3676HUJ#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 LTC3676HUJ#PBF meets industry standards.
7.What is the process for return or replacement of LTC3676HUJ#PBF?
All LTC3676HUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3676HUJ#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 LTC3676HUJ#PBF part is unused and in its original packaging.
Return procedure for LTC3676HUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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