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Analog Devices Inc. LTC3676EUJ-1#TRPBF
- Part No.:
- LTC3676EUJ-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3676EUJ-1#TRPBF.pdf
- Description:
- IC REG CONV I.MX6 7OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
LTC3676EUJ-1#TRPBF from Analog Devices is a highly integrated power management IC for application processors, featuring four synchronous buck converters (2.5A/2.5A/1.5A/1.5A), three 300mA LDOs, DDR termination support (±1.5A VTT + VTTR reference), I²C programmability, and pushbutton control - deployed in handheld instruments, automotive infotainment, and portable medical devices.
For engineers reviewing the LTC3676EUJ-1#TRPBF datasheet, LTC3676EUJ-1#TRPBF pinout, LTC3676EUJ-1#TRPBF application, or LTC3676EUJ-1#TRPBF equivalent, key selection criteria include DDR-specific VTTR/VTT rail coordination, I²C-configurable dynamic voltage scaling across eight rails, autonomous power-down sequencing, and operation over –40°C to 125°C in a 40-lead 6mm × 6mm QFN package.
Technical Context
The LTC3676EUJ-1#TRPBF implements a multi-rail PMIC architecture with dedicated hardware for DDR memory power delivery: Buck 1 operates as a ±1.5A bidirectional VTT regulator with VTTR reference output tied to VDDQIN, while Bucks 2–4 and LDOs supply core, SoC, I/O, and analog rails. All regulators support independent enable control via pin-strapping or I²C.
I²C interface (7-bit address 0x7D) enables real-time configuration of output voltages (via 5-bit DACs), operating modes (Burst/Pulse-Skipping/Forced Continuous), power-up/down sequencing, and status monitoring (PGOOD, IRQ, WAKE). The device integrates pushbutton logic for ON/WAKE/PWR_ON handshaking and supports autonomous reset and standby transitions without host intervention.
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 DC-DC pre-regulator supplies. |
| Buck Converter Outputs | Four channels: two 2.5A (Bucks 3/4), two 1.5A (Bucks 1/2); Buck 1 configured as ±1.5A DDR VTT with VTTR reference. |
| LDO Outputs | Three 300mA LDOs (LDO2–LDO4), plus always-on 25mA LDO1 - enables RTC/watchdog bias during system sleep. |
| Switching Frequency | Selectable 1.125MHz or 2.25MHz - balances efficiency vs. EMI filtering size; fixed-frequency mode avoids subharmonic instability. |
| Quiescent Current | 12µA standby current - minimizes battery drain in long-idle portable systems. |
| Package & Temp Range | 40-lead 6mm × 6mm QFN (UJ), exposed pad GND; rated for –40°C to +125°C junction temperature. |
| I²C Interface | Standard-mode (400kHz), 7-bit address 0x7D; supports voltage scaling, sequencing, fault reporting, and register readback. |
Pinout & Package
Package: 40-lead 6mm × 6mm plastic QFN (UJ), exposed thermal pad (Pin 41) soldered to PCB ground plane 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 2.7V–5.5V input feeding all PVIN pins and internal LDOs; requires ≥1µF ceramic bypass. |
| PVIN1–PVIN4 (Pins 35,34,15,16) | Per-buck high-side switch inputs | Individual power inputs for each buck stage; tied to VIN but decoupled locally with ≥10µF ceramic caps. |
| SW1–SW4 (Pins 31,20,33,11) | Buck switch node outputs | Connect to inductor high-side; drive external buck inductors (e.g., 1.5µH) and output capacitors (e.g., 47µF). |
| FB_B1–FB_B4 (Pins 24,25,22,23) | Buck feedback inputs | Resistor dividers set regulated output voltage; default VFB = 725mV (±12.5mV LSB step). |
| VDDQIN (Pin 9) / VTTR (Pin 10) | DDR reference sensing & output | VDDQIN senses DDR VDD supply; VTTR delivers precise 0.5×VDDQIN (±1%) buffered reference for DDR termination. |
| EN_B1–EN_B4 (Pins 34,30,18,17) | Buck enable inputs | Active-high digital enables; weak internal pull-downs allow pin-strapped startup sequencing without I²C. |
| SDA/SCL (Pins 13,14) | I²C serial interface | Level-shifted to DVDD (1.6V–5.5V); supports full register access for voltage, mode, and status configuration. |
| WAKE/IRQ/PWR_ON (Pins 33,32,21) | System control handshaking | Open-drain outputs/inputs coordinate power-on sequence, wake events, and fault signaling with host processor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DDR Power Solution | ±1.5A VTT regulator + VTTR reference eliminates need for discrete DDR termination ICs and reduces BOM count. |
| Eight Independent Rails | Four bucks + three LDOs + always-on LDO1 deliver precisely sequenced, isolated supplies for i.MX6, OMAP, and ARM Cortex processors. |
| Autonomous Pushbutton Control | ON, PWR_ON, and WAKE pins implement hardware-managed power-on/off/reset without firmware involvement. |
| Dynamic Voltage Scaling (DVS) | I²C-controlled DACs adjust buck output voltages on-the-fly to match processor performance states and reduce dynamic power. |
| Low-Power Standby Mode | 12µA quiescent current with all regulators disabled - extends battery life in always-connected portable devices. |
| VSTB Pin for Dual-Voltage Operation | Hardware-selectable run/standby voltage sets (via VSTB) enable fast rail transitions for low-power display or memory retention modes. |
Applications
| Handheld Medical Scanners | Automotive Infotainment Head Units |
|---|---|
Use Scenario: Portable ultrasound or glucose monitor requiring compact, low-noise, multi-rail power for ADC, FPGA, and display drivers. IC Role / Device Role: Central PMIC supplying 1.2V core, 1.8V I/O, 2.5V analog, 3.3V interface, and DDR3 termination rails. Use Value: Integrated VTTR/VTT eliminates external termination IC, reducing board area by >25% and improving DDR signal integrity. |
Use Scenario: In-vehicle navigation system with ARM-based SoC, touchscreen controller, audio codec, and CAN interface. IC Role / Device Role: Primary power manager delivering eight regulated rails with AEC-Q100-compliant reliability and thermal robustness. Use Value: –40°C to 125°C operation ensures stable boot and runtime performance under automotive cabin temperature extremes. |
| Industrial Handheld Terminals | High-End Consumer Tablets |
Use Scenario: Ruggedized barcode scanner with Wi-Fi, GPS, and OLED display needing efficient, sequenced power-up and low standby drain. IC Role / Device Role: Single-chip solution managing processor core, memory, peripherals, and display backlight with pushbutton-initiated wake. Use Value: 12µA standby current extends battery life to >30 days in sleep mode, meeting industrial duty-cycle requirements. |
Use Scenario: Premium tablet using i.MX8 or similar application processor demanding dynamic voltage scaling and DDR4-compatible termination. IC Role / Device Role: Configurable PMIC enabling adaptive power delivery across CPU, GPU, DRAM, and camera subsystems. Use Value: I²C DVS allows real-time voltage adjustment matching workload, cutting active power consumption by up to 35%. |
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 PMIC; no integrated VTTR/VTT; I²C-only control; 0.8V–3.3V output range. | Lacks DDR-specific termination capability; requires external VTT circuitry for DDR3/4 designs. | Select when DDR termination is handled externally or not required; better suited for non-DDR SoCs like Sitara AMx. |
| MAX77818EWK+T | 4-buck + 6-LDO; includes dedicated 3A VDDQ + 1.5A VTT; supports LPDDR4; 2.5V–5.5V input. | Higher VTT current (1.5A vs. ±1.5A), LPDDR4-optimized timing, but no VTTR reference buffer. | Prefer for LPDDR4-based platforms where VTT sourcing/sinking is critical and VTTR is derived separately. |
Compared with TPS659122YFFR and MAX77818EWK+T, the LTC3676EUJ-1#TRPBF uniquely combines VTTR reference buffering with bidirectional VTT regulation in a single 40-pin QFN, simplifying DDR3/4 power design while maintaining ultra-low standby current and robust pushbutton control.
Availability
LTC3676EUJ-1#TRPBF is available at Aetrix Electronics and suitable for handheld medical scanners, automotive infotainment head units, and industrial handheld terminals requiring stable component supply, extended temperature operation, and DDR3/4 power integrity.
Supply support for LTC3676EUJ-1#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 (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3676EUJ-1#TRPBF belongs to the LTC® Power Management family, engineered specifically for advanced portable application processors - emphasizing integration, low quiescent current, DDR compatibility, and autonomous system control.
FAQ
What is the primary function of the LTC3676EUJ-1#TRPBF in a system?
The LTC3676EUJ-1#TRPBF serves as a complete power management IC for application processors, integrating four synchronous buck converters, three 300mA LDOs, and a DDR-specific ±1.5A VTT regulator with VTTR reference. It manages power sequencing, dynamic voltage scaling, and pushbutton-initiated system control - eliminating the need for multiple discrete regulators in portable and automotive SoC designs.
How does the LTC3676EUJ-1#TRPBF support DDR memory termination?
The LTC3676EUJ-1#TRPBF supports DDR termination through its dedicated Buck 1 channel, configured as a ±1.5A bidirectional VTT regulator, and its VTTR pin, which delivers a buffered 0.5×VDDQIN reference (±1% accuracy). VDDQIN (Pin 9) senses the DDR VDD supply, enabling precise VTTR tracking and eliminating external reference circuitry.
What are the key differences between LTC3676EUJ-1#TRPBF and the standard LTC3676EUJ#TRPBF?
The LTC3676EUJ-1#TRPBF includes DDR-specific functionality absent in the base LTC3676EUJ#TRPBF: VTTR reference output and ±1.5A VTT regulation (Buck 1). The standard version lacks VDDQIN and VTTR pins and configures Buck 1 as a unidirectional 1.5A supply. Pinout, package, and temperature grade (–40°C to 125°C) are identical.
Can the LTC3676EUJ-1#TRPBF operate without I²C communication?
Yes, the LTC3676EUJ-1#TRPBF supports full pin-strapped operation: EN_Bx and EN_Lx pins enable/disable regulators, VSTB selects voltage sets, and ON/PWR_ON/WAKE pins manage power sequencing autonomously. I²C is optional for dynamic reconfiguration, status monitoring, and fine-grained control - not required for basic power delivery.
What thermal considerations apply to the LTC3676EUJ-1#TRPBF in high-power applications?
The LTC3676EUJ-1#TRPBF uses a 40-lead 6mm × 6mm QFN with exposed thermal pad (Pin 41) that must be soldered to a PCB ground plane. With θJA = 33°C/W, sustained 2.5A buck operation requires adequate copper area and airflow. Junction temperature must stay ≤125°C (E-grade) - derating is needed above this threshold to ensure reliability and lifetime.
LTC3676EUJ-1#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-1#TRPBF FAQ
1.How can I place an order for LTC3676EUJ-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3676EUJ-1#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-1#TRPBF reliable?
The price and inventory of LTC3676EUJ-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3676EUJ-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3676EUJ-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3676EUJ-1#TRPBF?
LTC3676EUJ-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3676EUJ-1#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-1#TRPBF?
For technical support, including LTC3676EUJ-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3676EUJ-1#TRPBF requirements.
6.How does Aetrix verify that LTC3676EUJ-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3676EUJ-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3676EUJ-1#TRPBF?
All LTC3676EUJ-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3676EUJ-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3676EUJ-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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