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Analog Devices Inc. LTC3676ILXE#WPBF
- Part No.:
- LTC3676ILXE#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 48-LQFP Exposed Pad
- Datasheet:
-
LTC3676ILXE#WPBF.pdf
- Description:
- PWR M SOLUTION FOR APPLICATION P
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LTC3676ILXE#WPBF from Analog Devices is an AEC-Q100 qualified power management IC for automotive application processors, integrating four synchronous buck converters (2.5A/2.5A/1.5A/1.5A), three 300mA LDOs (two adjustable), and I²C-controlled DDR termination (VTT/VTTR) - enabling complete multi-rail power sequencing in infotainment systems.
For engineers reviewing the LTC3676ILXE#WPBF datasheet, LTC3676ILXE#WPBF pinout, LTC3676ILXE#WPBF application, or LTC3676ILXE#WPBF equivalent, key selection considerations include its 48-lead eLQFP package, –40°C to 125°C automotive temperature range, I²C programmable voltage scaling, autonomous power-down control, and support for i.MX, ARM Cortex, and OMAP processor families.
Technical Context
The LTC3676ILXE#WPBF implements independent I²C-addressable regulation across eight rails: four buck regulators with selectable 1.125 MHz / 2.25 MHz switching frequencies and burst/pulse-skipping/forced-continuous modes; three LDOs with soft-start, low dropout (e.g., 280 mV at 300 mA for LDO3), and precision feedback references (725 mV typical).
Its automotive-grade architecture includes pushbutton ON/OFF control with configurable reset timing, VSTB-driven dual-DAC voltage standby mode, PGOOD/RSTO/IRQ status outputs, and integrated VTTR reference generation (0.5 × VDDQIN ±1%) - all validated for AEC-Q100 Grade 2 (–40°C to 125°C) operation in safety-critical vehicle systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion or 3.3 V/5 V system rails without external pre-regulation |
| Buck Regulator Outputs | Four channels: two 2.5 A (Buck 3/4), two 1.5 A (Buck 1/2) - powers core, SoC, memory, and I/O rails simultaneously |
| LDO Outputs | Three 300 mA LDOs (LDO2/LDO3/LDO4); LDO1 fixed 25 mA always-on - supplies low-noise analog, RTC, and standby logic |
| DDR Support | VTT (±1.5 A) and VTTR (0.5 × VDDQIN, ±1% accuracy) - meets JEDEC DDR3/DDR4 termination requirements |
| Control Interface | I²C (400 kHz, 7-bit address 0x7C for LTC3676-1) - enables dynamic voltage scaling, sequencing, and real-time status reporting |
| Quiescent Current | 12 µA standby (VIN only) - extends battery life during deep-sleep states in automotive modules |
| Package & Temp Range | 48-lead exposed-pad eLQFP (7 mm × 7 mm); –40°C to 125°C - qualified per AEC-Q100 for under-hood and infotainment use |
Pinout & Package
Package: 48-lead plastic eLQFP (7 mm × 7 mm) with exposed thermal pad (Pin 49 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity (θJA = 19°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1–SW4 | Buck switch node outputs | Drive external inductors; require low-ESR ceramic output capacitors (e.g., 47 µF) for stable regulation |
| FB_B1–FB_B4 | Buck feedback inputs | Resistor dividers set output voltages; internal 800 mV reference enables precise adjustment (e.g., 1.2 V, 1.8 V, 2.5 V) |
| LDO1–LDO4 | LDO regulated outputs | LDO1 is always-on (25 mA); LDO2/LDO4 adjustable via FB_L2/FB_L4; LDO3 fixed 1.8 V (300 mA) |
| VDDQIN / VTTR | DDR reference sense & output | VDDQIN monitors DDR supply; VTTR delivers buffered 0.5×VDDQIN reference for DDR VREF compliance |
| ON / PWR_ON / WAKE | Pushbutton & system handshaking | ON initiates power-up; PWR_ON acknowledges sequence; WAKE signals wake events to host processor |
| SDA / SCL / DVDD | I²C interface | DVDD sets logic level (1.6 V–5.5 V); supports standard-mode I²C (400 kHz) for full register access and fault logging |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous Power Sequencing | Configurable start-up order via pin-strapping or I²C - eliminates need for external sequencer in multi-rail designs |
| Dynamic Voltage Scaling (DVS) | I²C-programmable output voltages on all bucks and adjustable LDOs - reduces power consumption during low-performance states |
| VSTB Dual-DAC Mode | VSTB pin toggles between run and standby DAC registers - enables seamless transition between active and low-power DDR modes |
| AEC-Q100 Automotive Qualification | Grade 2 (–40°C to 125°C) with controlled manufacturing - certified for use in automotive infotainment and ADAS subsystems |
| Integrated VTTR Reference | 0.5 × VDDQIN with ±1% accuracy and <10 mA sourcing/sinking - meets JEDEC DDR3/DDR4 VREF tolerance requirements |
| Low-Noise LDO Architecture | 300 mA LDOs with 0.01%/V line regulation and 0.05% load regulation - suitable for noise-sensitive analog circuits |
Applications
| Automotive Infotainment | Industrial Handheld Scanners |
|---|---|
Use Scenario: Powering quad-core ARM Cortex-A53 SoC, DDR3 memory, touchscreen controller, and audio codec in head-unit systems. IC Role / Device Role / Timing Role: Central PMIC managing eight independent rails with I²C-controlled sequencing and DDR termination. Use Value: Eliminates discrete regulator count by >70%; AEC-Q100 qualification ensures reliability in vehicle cabin environments. |
Use Scenario: Battery-powered rugged scanner requiring low quiescent current, fast wake-up, and stable analog sensor supplies. IC Role / Device Role / Timing Role: Single-chip power source for processor core, memory, image sensor bias, and USB PHY interface. Use Value: 12 µA standby current extends battery life; LDO1 provides always-on RTC supply without external circuitry. |
| Medical Point-of-Care Devices | Multi-Rail Industrial Controllers |
Use Scenario: Portable ultrasound or glucose monitor needing EMI-clean power for ADCs, RF front-end, and display backlight. IC Role / Device Role / Timing Role: Low-noise LDOs (LDO2/LDO3) supply analog signal chain; bucks deliver clean digital rails. Use Value: 0.01% line regulation and 300 mA LDO output ensure stable reference voltages for 16-bit ADC performance. |
Use Scenario: Programmable logic controller (PLC) module with FPGA, Ethernet PHY, isolated I/O, and real-time clock. IC Role / Device Role / Timing Role: Configurable buck/LDO combination powers FPGA core (1.2 V), I/O banks (2.5 V/3.3 V), and auxiliary logic. Use Value: I²C programmability allows firmware-based rail reconfiguration without hardware changes. |
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 |
|---|---|---|---|
| TPS659122ZWSR | 6-buck + 8-LDO PMIC; 2.7–5.5 V input; no integrated VTTR; I²C-only control; QFN-80 package | Targets high-pin-count portable SoCs (e.g., TI AMx); lacks DDR-specific VTTR/VTT compliance | Select when VTTR is not required and higher LDO count is needed for complex peripheral power domains. |
| MAX20029ATGB/V+T | 4-buck + 3-LDO; AEC-Q100 Grade 1 (–40°C to 125°C); integrated watchdog; no VSTB or VTTR; TQFN-40 package | Optimized for ASIL-B functional safety; includes windowed watchdog but omits DDR reference generation | Prefer for safety-critical MCU power where DDR termination is handled externally or not used. |
Compared with TPS659122ZWSR and MAX20029ATGB/V+T, the LTC3676ILXE#WPBF uniquely combines AEC-Q100 qualification, integrated VTTR/VTT DDR support, VSTB dual-DAC mode, and 48-lead eLQFP packaging - making it the only option among the three qualified for automotive DDR3/DDR4 memory subsystems with minimal external components.
Availability
LTC3676ILXE#WPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial handheld scanners, and medical point-of-care devices requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LTC3676ILXE#WPBF 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, I²C-configurable power management solutions specifically designed for advanced application processors in automotive and portable systems - emphasizing DDR compliance, low quiescent current, and robust thermal performance.
FAQ
What is the operating temperature range for the LTC3676ILXE#WPBF?
The LTC3676ILXE#WPBF is rated for –40°C to 125°C junction temperature and is AEC-Q100 qualified for automotive Grade 2 applications. Its 48-lead eLQFP package features an exposed thermal pad (Pin 49 = GND) that must be soldered to the PCB ground plane to achieve θJA = 19°C/W and maintain reliable operation within this range.
Does the LTC3676ILXE#WPBF support DDR memory termination?
Yes, the LTC3676ILXE#WPBF supports DDR termination via integrated VTT (±1.5 A) and VTTR (0.5 × VDDQIN) outputs. VTTR delivers a buffered, precision reference with ±1% accuracy over temperature and line, meeting JEDEC DDR3/DDR4 VREF specifications - confirmed in the LTC3676-1 variant data sheet.
How does the VSTB pin function on the LTC3676ILXE#WPBF?
The VSTB pin on the LTC3676ILXE#WPBF selects between two sets of DAC registers: when low, DVBxA registers control output voltages; when high, DVBxB registers take effect. This enables seamless transition between active and standby voltage levels - for example, lowering DDR I/O voltage during sleep without software intervention.
What are the I²C address options for the LTC3676ILXE#WPBF?
The LTC3676ILXE#WPBF uses a fixed 7-bit I²C address of 0x7C (1111100b) for the LTC3676-1 variant. This address is hardwired and non-configurable; communication occurs at up to 400 kHz standard-mode speed, with DVDD defining logic thresholds (1.6 V–5.5 V).
Can the LTC3676ILXE#WPBF operate without I²C configuration?
Yes, the LTC3676ILXE#WPBF supports full pin-strapped operation: all buck and LDO outputs default to factory-set voltages (e.g., Buck1 = 1.2 V, LDO3 = 1.8 V) at power-up. I²C is optional for dynamic voltage scaling, sequencing control, and status monitoring - not required for basic functionality.
LTC3676ILXE#WPBF 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP-EP (7x7)
LTC3676ILXE#WPBF FAQ
1.How can I place an order for LTC3676ILXE#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3676ILXE#WPBF 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 LTC3676ILXE#WPBF reliable?
The price and inventory of LTC3676ILXE#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3676ILXE#WPBF is usually 5 days.
3.What payment methods are accepted for LTC3676ILXE#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3676ILXE#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3676ILXE#WPBF?
LTC3676ILXE#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3676ILXE#WPBF 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 LTC3676ILXE#WPBF?
For technical support, including LTC3676ILXE#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3676ILXE#WPBF requirements.
6.How does Aetrix verify that LTC3676ILXE#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC3676ILXE#WPBF 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 LTC3676ILXE#WPBF meets industry standards.
7.What is the process for return or replacement of LTC3676ILXE#WPBF?
All LTC3676ILXE#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3676ILXE#WPBF, 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 LTC3676ILXE#WPBF part is unused and in its original packaging.
Return procedure for LTC3676ILXE#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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