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Analog Devices Inc. LTC7818EUJ#TRPBF
- Part No.:
- LTC7818EUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- -
- Datasheet:
-
LTC7818EUJ#TRPBF.pdf
- Description:
- BUCK/BUCK/BOOST SYNC CTL, 40V, 3
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
LTC7818EUJ#TRPBF from Analog Devices is a high-performance triple-output synchronous DC/DC controller integrating two buck and one boost channel, operating from 4.5V to 40V input with 14μA no-load quiescent current, 3MHz max switching frequency, and AEC-Q100 qualification for automotive cold-crank operation down to 1V input. It drives all-N-channel MOSFETs and supports PassThru™ mode for low-loss boost operation in start-stop systems.
For engineers reviewing the LTC7818EUJ#TRPBF datasheet, LTC7818EUJ#TRPBF pinout, LTC7818EUJ#TRPBF application, or LTC7818EUJ#TRPBF equivalent, key selection criteria include its triple-output topology, spread-spectrum EMI reduction, OPTI-LOOP® compensation, 0.8V/1.2V precision references, and 40-lead 6mm × 6mm QFN package with exposed thermal pad.
Technical Context
The LTC7818EUJ#TRPBF implements constant-frequency current-mode control across three independent channels: two buck controllers (VFB1/VFB2 = 0.8V reference) and one boost controller (VFB3 = 1.2V reference, programmable via VPRG3). Its phase-lockable architecture supports synchronization from 100kHz to 3MHz and spread-spectrum modulation to reduce peak EMI emissions on both input and output rails.
It features dual biasing paths-VBIAS (4.5V–40V) and EXTVCC (≥4.7V switchover)-to minimize total system IQ; integrated INTVCC LDO (5.1V ±2%) powers internal circuitry; and PassThru™ capability enables 100% duty cycle operation for the boost channel during low-input conditions, maintaining regulation through automotive cold-crank transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual buck + single boost synchronous controller - enables compact multi-rail power supply with shared gate drivers and unified control logic. |
| Input Voltage Range | 4.5V to 40V (VBIAS); 1V to 40V post-startup (VIN) - supports wide automotive battery range including cold-crank down to 1V. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Channel 1 active) - extends battery runtime in always-on vehicle modules and IoT edge nodes. |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable - allows EMI optimization and inductor size reduction while enabling synchronized multi-phase designs. |
| Reference Voltages | 0.8V (buck), 1.2V (boost) - enables precise output regulation with tight tolerance over temperature and line/load variations. |
| Package | 40-lead 6mm × 6mm QFN with exposed GND pad - provides low thermal resistance (θJA = 33°C/W) for high-power density automotive applications. |
| AEC-Q100 Grade | Grade E (–40°C to +125°C junction) - qualified for under-hood and infotainment power supplies requiring automotive reliability. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN with exposed thermal pad (Pin 41 = GND, must be soldered to PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (1) | Light-load operation mode select | Configures Burst Mode (GND/floating), Pulse-Skipping (100kΩ to INTVCC), or Forced Continuous (INTVCC) across all channels. |
| RUN1,RUN2,RUN3 (8–10) | Independent channel enable inputs | Each disables its respective controller below 1.1V; all <0.7V shuts down entire IC with 1.5μA shutdown IQ. |
| VPRG3 (16) | Boost output voltage programming | Floating → adjustable via external resistors at VFB3; GND → 8V fixed; INTVCC → 10V fixed - simplifies design for common automotive rail voltages. |
| OV3 (17) | Boost overvoltage indicator | Open-drain output pulled low when VFB3 < 110% of setpoint - enables system-level fault monitoring without additional comparators. |
| IMON3 (7) | Boost inductor current monitor | Analog voltage output (0.4V–1.4V) proportional to boost channel current - supports real-time current sensing for diagnostics or closed-loop protection. |
| PLLIN/SPREAD (34) | Frequency sync/spread-spectrum control | Accepts external clock (0.1–3MHz) or enables spread spectrum when tied to INTVCC - reduces conducted/EMI peaks by >10dB. |
Key Features
| Feature | Design Value |
|---|---|
| PassThru™ boost operation | Enables 100% duty cycle for synchronous boost FET during VIN < VOUT, minimizing conduction loss in automotive start-stop applications. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitor ESR and capacitance values without external compensation redesign. |
| Spread-spectrum modulation | Reduces peak radiated/conducted noise by spreading energy across frequency band - eases compliance with CISPR 25 Class 5 automotive EMI limits. |
| RSENSE or DCR current sensing | Supports either discrete sense resistor or inductor DCR sensing per channel - lowers BOM cost and improves efficiency by eliminating sense resistor losses. |
| Triple independent soft-start | TRACK/SS1, TRACK/SS2, SS3 pins allow sequenced startup and output voltage tracking - prevents backfeeding and ensures proper power-up order in multi-rail systems. |
Applications
| Automotive Infotainment Power Supply | ADAS Domain Controller Core Rails |
|---|---|
Use Scenario: Powers multiple voltage rails (e.g., 3.3V, 5V, 10V) for head unit SoC, display, audio codec, and USB interfaces in vehicles with stop-start engines. IC Role / Device Role / Timing Role: Triple-output controller managing buck-buck-boost conversion with cold-crank support and PassThru™ mode for uninterrupted 10V boost rail during engine restart. Use Value: Eliminates need for separate boost IC and reduces solution size by 35% versus discrete controllers while meeting AEC-Q100 and CISPR 25 requirements. | Use Scenario: Generates core (0.8V), I/O (1.8V), and auxiliary (12V) rails for radar/Ethernet domain controllers requiring fast transient response and low EMI. IC Role / Device Role / Timing Role: Synchronous controller delivering tightly regulated outputs with OPTI-LOOP® compensation and programmable 2.25MHz switching for minimal output ripple and small ceramic capacitors. Use Value: Achieves <1% load transient deviation and <10mV P-P ripple at 6A load step, enabling reliable operation of high-speed SerDes links. |
| Industrial PLC I/O Module | Avionics Cabin Management System |
Use Scenario: Supplies isolated sensor interface (5V), microcontroller (3.3V), and analog front-end (±12V derived via charge pump) in harsh industrial environments. IC Role / Device Role / Timing Role: Dual-buck controller with robust UVLO (4.1V rising/3.75V falling) and overtemperature protection ensures reliable operation during brownouts and thermal stress. Use Value: Maintains regulation during 100ms 5V input dips to 3.8V and survives 150°C junction temperature with automatic foldback current limiting. | Use Scenario: Provides primary 28V-to-5V/3.3V/10V conversion for cabin lighting, HVAC controls, and passenger entertainment in aircraft with wide input variation (18–32V). IC Role / Device Role / Timing Role: Triple-output controller with spread-spectrum and phase-locking used to synchronize switching with avionics master clock, avoiding beat frequencies in sensitive RF bands. Use Value: Reduces 150–1000MHz conducted emissions by 12dB, enabling DO-160 Section 20 Level RTCA/DO-160G compliance without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7813EUJ#TRPBF | Dual buck only (no boost channel); same 40-lead QFN package and 3MHz max frequency; lower IQ (9μA) but lacks PassThru™ and VPRG3 programming. | Suitable only for dual-rail systems requiring no boost functionality; cannot replace LTC7818EUJ#TRPBF in cold-crank boost applications. | Select when only two regulated rails are needed and lowest possible quiescent current is critical. |
| MP2918GL-Z | Triple-output buck/buck/buck controller (no boost); 2.2MHz max frequency; 12μA IQ; non-AEC-Q100; smaller 32-pin 4mm × 4mm QFN. | Not rated for automotive cold-crank or 125°C operation; lacks spread spectrum and OPTI-LOOP®; limited to industrial temperature range. | Choose for cost-sensitive industrial applications where boost functionality and automotive qualification are unnecessary. |
Compared with LTC7813EUJ#TRPBF and MP2918GL-Z, the LTC7818EUJ#TRPBF uniquely integrates a programmable synchronous boost channel with PassThru™ capability and AEC-Q100 qualification-making it the only option for automotive multi-rail systems requiring cold-crank resilience and EMI-compliant 10V auxiliary rail generation.
Availability
LTC7818EUJ#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC7818EUJ#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and aerospace markets.
The LTC7818EUJ#TRPBF belongs to the Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial power systems requiring ultra-low IQ, wide input range, and robust EMI performance.
FAQ
What is the minimum input voltage required for LTC7818EUJ#TRPBF to operate after startup?
The LTC7818EUJ#TRPBF can operate from an input supply as low as 1V after startup when biased from the boost output or another auxiliary supply. This capability is essential for automotive cold-crank scenarios where battery voltage drops below 6V. The device maintains regulation across all three outputs during this condition using its PassThru™ boost mode and low-IQ architecture. Startup itself requires ≥4.5V on VBIAS.
How does the LTC7818EUJ#TRPBF achieve EMI reduction without external filters?
The LTC7818EUJ#TRPBF incorporates spread-spectrum frequency modulation (SSFM) that dithers the switching frequency by ±12% to ±15% around its nominal value. When PLLIN/SPREAD is tied to INTVCC, this spreads energy across a bandwidth, reducing peak conducted and radiated emissions by up to 10–12dB. Combined with optimized gate drive timing and low-noise current sensing, it meets CISPR 25 Class 5 limits with minimal external filtering-critical for space-constrained automotive layouts.
Can the LTC7818EUJ#TRPBF generate a fixed 10V boost output without external resistors?
Yes. The LTC7818EUJ#TRPBF supports fixed 10V boost output by connecting the VPRG3 pin (Pin 16) directly to INTVCC. In this configuration, VFB3 is internally connected to the boost output, eliminating the need for external feedback resistors. This simplifies design for common automotive auxiliary rails and improves accuracy by removing resistor tolerance and thermal drift effects from the feedback path.
What thermal management provisions does the LTC7818EUJ#TRPBF include for high-power automotive applications?
The LTC7818EUJ#TRPBF features an exposed thermal pad (Pin 41) that must be soldered to a PCB copper plane for effective heat dissipation. Its θJA is specified at 33°C/W, and it includes overtemperature protection that reduces output current above 150°C junction temperature. The device also supports EXTVCC biasing to shift power dissipation from VBIAS to a lower-voltage rail, lowering overall thermal load in high-current configurations.
Does the LTC7818EUJ#TRPBF support output voltage sequencing across its three channels?
Yes. The LTC7818EUJ#TRPBF provides independent soft-start and tracking control via TRACK/SS1, TRACK/SS2, and SS3 pins. These allow precise sequencing of the two buck outputs relative to each other or to an external reference, and enable the boost output to track a master rail. This prevents backfeeding, ensures proper power-up order in complex SoC systems, and eliminates need for external sequencing ICs in multi-rail automotive designs.
LTC7818EUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 40V
- Frequency - Switching:
- 100kHz ~ 3MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LTC7818EUJ#TRPBF FAQ
1.How can I place an order for LTC7818EUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7818EUJ#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 LTC7818EUJ#TRPBF reliable?
The price and inventory of LTC7818EUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7818EUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7818EUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7818EUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7818EUJ#TRPBF?
LTC7818EUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7818EUJ#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 LTC7818EUJ#TRPBF?
For technical support, including LTC7818EUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7818EUJ#TRPBF requirements.
6.How does Aetrix verify that LTC7818EUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7818EUJ#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 LTC7818EUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7818EUJ#TRPBF?
All LTC7818EUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7818EUJ#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 LTC7818EUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC7818EUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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