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Analog Devices Inc. LTC7818IUJ#TRPBF
- Part No.:
- LTC7818IUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- -
- Datasheet:
-
LTC7818IUJ#TRPBF.pdf
- Description:
- BUCK/BUCK/BOOST SYNC CTL, 40V, 3
- Quantity:
- Payment:
- Shipping:
Inventory:1,178
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Product details
Overview
LTC7818IUJ#TRPBF from Analog Devices is a high-performance triple-output synchronous DC/DC controller (buck/buck/boost) driving all-N-channel MOSFET stages. It delivers 3.3V/12A, 5V/10A, and regulated 10V boost outputs from 4.5V–40V input, supports cold-crank down to 1V after startup, features 14μA no-load IQ, and operates up to 3MHz with phase-lockable frequency.
For engineers reviewing the LTC7818IUJ#TRPBF datasheet, LTC7818IUJ#TRPBF pinout, LTC7818IUJ#TRPBF application, or LTC7818IUJ#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, PassThru™ boost capability for automotive start-stop, OPTI-LOOP® compensation, spread spectrum EMI reduction, and dual-buck-plus-boost topology for multi-rail power systems.
Technical Context
The LTC7818IUJ#TRPBF implements three independent current-mode control loops: two buck channels with 0.8V reference and one boost channel with 1.2V (or 8V/10V fixed via VPRG3), each supporting RSENSE or DCR sensing. Its constant-frequency architecture enables precise timing control across 100kHz–3MHz, with PLLIN/SPREAD enabling synchronization or spread-spectrum operation to reduce peak EMI.
Power sequencing is managed via separate RUN1/RUN2/RUN3 pins, while TRACK/SS1/SS2/SS3 support soft-start and output voltage tracking. The controller integrates internal 5.1V INTVCC LDO, EXTVCC switchover at 4.7V, and BOOST3 charge pump capable of 20–50μA output-enabling robust gate drive under wide VIN conditions including automotive cold-crank transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller-enables single-chip generation of multiple isolated rails with independent regulation. |
| Input Voltage Range | 4.5V–40V main bias; operates down to 1V post-startup when biased from boost output-supports automotive battery range including cold-crank. |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable via PLLIN/SPREAD-allows EMI optimization and clock synchronization in multi-controller systems. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Channel 1 active)-extends battery runtime in always-on automotive/industrial subsystems. |
| Reference Voltages | 0.8V ±12mV (buck), 1.2V ±17mV (boost, VPRG3 = FLOAT)-ensures tight output regulation across temperature and load. |
| Package | 40-lead 6mm × 6mm QFN with exposed thermal pad-provides low θJA = 33°C/W for high-power density in space-constrained designs. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C junction)-qualified for automotive infotainment, ADAS, and body electronics applications. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN with exposed GND pad (Pin 41), θJA = 33°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (1) | Light-load operation mode select | Configures Burst Mode (GND), Pulse-Skipping (100k to INTVCC), or Forced Continuous (INTVCC)-directly impacts efficiency vs. ripple trade-off. |
| RUN1/RUN2/RUN3 (8–10) | Independent channel enable/disable | Each pin disables its respective controller below 1.1V; all <0.7V shuts down entire IC-enables flexible power sequencing and fault isolation. |
| VPRG3 (16) | Boost output voltage programming | Float = adjustable via VFB3 resistor divider (1.2V ref); GND = 8V fixed; INTVCC = 10V fixed-simplifies boost rail configuration without external DAC. |
| OV3 (17) | Boost overvoltage indicator | Open-drain output pulled low when VFB3 <90% setpoint; high-Z above 110%-provides fail-safe monitoring for boost rail integrity. |
| IMON3 (7) | Boost inductor current monitor | Analog voltage output (0.4V–1.4V) proportional to boost channel current-enables real-time current limiting and telemetry without sense resistor. |
| PLLIN/SPREAD (34) | Frequency sync/spread spectrum control | Accepts external clock (0.1–3MHz) for synchronization or INTVCC for ±12%/+15% spread spectrum-reduces EMI peaks without changing layout. |
Key Features
| Feature | Design Value |
|---|---|
| PassThru™ boost operation | Enables 100% duty cycle for synchronous boost MOSFET-minimizes conduction loss during automotive start-stop when VIN ≈ VOUT. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitor ESR and capacitance values-eliminates need for custom compensation per design. |
| Spread spectrum modulation | Reduces peak conducted/radiated EMI by spreading switching energy across frequency band-simplifies EMC compliance without added filtering. |
| Triple independent RUN pins | Supports staggered startup, dynamic rail enable/disable, and fault containment-critical for safety-critical automotive domain controllers. |
| Low shutdown IQ (1.5μA) | Enables ultra-low standby power in always-connected vehicle modules-meets ISO 16750-2 quiescent current requirements. |
Applications
| Automotive Infotainment Power | Industrial Dual-Rail Sensor Hub |
|---|---|
Use Scenario: Powering head unit SoC (3.3V/5V) and display backlight boost (10V) from 12V battery with cold-crank immunity. IC Role / Device Role / Timing Role: Triple-output controller managing buck/buck/boost conversion with synchronized switching and independent soft-start. Use Value: Eliminates need for discrete boost converter; PassThru™ maintains regulation during 1V cranking; spread spectrum meets CISPR 25 Class 5. | Use Scenario: Supplying 3.3V microcontroller and 5V analog sensor interface from wide-input industrial 24V supply. IC Role / Device Role / Timing Role: Dual-buck controller with precision 0.8V references and OPTI-LOOP® for stable transient response across varying sensor loads. Use Value: Single-chip solution reduces BOM count and PCB area; 14μA IQ extends battery backup time in remote monitoring nodes. |
| Avionics Display Backlight | Automotive ADAS Camera Module |
Use Scenario: Generating 5V logic rail and 10V LED backlight from 28V aircraft bus with strict EMI limits. IC Role / Device Role / Timing Role: Buck/boost controller with phase-lockable 2.25MHz operation and spread spectrum to suppress narrowband emissions. Use Value: Meets DO-160 Section 20 radiated emissions; AEC-Q100 Grade I ensures reliability in vibration-prone environments. | Use Scenario: Powering 3.3V image sensor and 5V ISP from automotive 12V rail with cold-crank survival and fast transient response. IC Role / Device Role / Timing Role: Dual-buck controller with 3MHz switching and 40ns minimum on-time for compact magnetics and rapid load-step recovery. Use Value: Enables <100µs recovery from 0→2A load step; 1.5μA shutdown IQ supports ASAM sleep modes. |
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 |
|---|---|---|---|
| LTC7813IUJ#TRPBF | Dual-buck-only (no boost); 40V input; 0.8V ref; same 40-lead QFN package | Suitable only where third rail is generated externally or not required | Select when boost functionality is unnecessary-reduces complexity and cost for dual-rail systems. |
| MPQ8645PGU-AEC1-P | Single-buck controller (not triple); 40V input; 0.6V ref; AEC-Q100 Grade 1; 24-pin QFN | Requires two ICs to replicate LTC7818IUJ#TRPBF's triple output capability | Consider for cost-sensitive dual-buck designs where layout area allows multiple controllers. |
Compared with LTC7813IUJ#TRPBF and MPQ8645PGU-AEC1-P, the LTC7818IUJ#TRPBF uniquely integrates buck/buck/boost in one AEC-Q100-qualified device-enabling compact, EMI-optimized power architectures for automotive and avionics where regulated boost is mandatory.
Availability
LTC7818IUJ#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor hubs, avionics displays, and ADAS camera modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LTC7818IUJ#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 LTC7818IUJ#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-noise, multi-rail power conversion in demanding automotive and industrial applications.
FAQ
What is the minimum input voltage for LTC7818IUJ#TRPBF after startup?
The LTC7818IUJ#TRPBF can operate from as low as 1V input after startup when biased from the boost output or another auxiliary supply-enabling continuous regulation during automotive cold-crank events where battery voltage dips below 5V. This capability is confirmed in the Absolute Maximum Ratings table and Typical Application section of the datasheet, which shows stable operation down to 1V with VIN > VOUT for the boost channel.
Does LTC7818IUJ#TRPBF support spread spectrum operation, and how is it enabled?
Yes, the LTC7818IUJ#TRPBF supports spread spectrum modulation to reduce EMI peaks. It is enabled by connecting the PLLIN/SPREAD pin to INTVCC, which activates ±12% frequency deviation below nominal and +15% above-spreading switching energy across a bandwidth to ease CISPR 25 and DO-160 compliance. This feature is documented in the FEATURES section and Electrical Characteristics table under Spread Spectrum Oscillator parameters.
How does the PassThru™ capability of LTC7818IUJ#TRPBF improve automotive start-stop performance?
The PassThru™ capability in the LTC7818IUJ#TRPBF allows the synchronous boost MOSFET to operate at 100% duty cycle when VIN ≥ VOUT, eliminating switching losses and minimizing voltage drop during engine restart. This maintains stable 10V boost output even as battery voltage recovers from cranking-directly improving system uptime and reducing thermal stress on power components in start-stop applications.
What are the supported light-load operating modes for LTC7818IUJ#TRPBF, and how are they selected?
The LTC7818IUJ#TRPBF supports Burst Mode (MODE = GND), Pulse-Skipping (MODE tied to INTVCC via 100kΩ), and Forced Continuous (MODE = INTVCC). These modes are selected via the MODE pin and affect efficiency vs. output ripple trade-offs-Burst Mode achieves lowest IQ (14μA), while Forced Continuous provides lowest noise. Pin Functions section confirms this behavior across all three channels.
Is LTC7818IUJ#TRPBF qualified for automotive applications, and what grade does it carry?
Yes, the LTC7818IUJ#TRPBF is AEC-Q100 qualified for automotive use and carries Grade I rating (–40°C to +125°C junction temperature), as specified in the ORDER INFORMATION table and FEATURES list. This qualification covers reliability testing for temperature cycling, humidity, mechanical shock, and ESD-making it suitable for infotainment, body control, and ADAS modules in production vehicles.
LTC7818IUJ#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:
- -
LTC7818IUJ#TRPBF FAQ
1.How can I place an order for LTC7818IUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7818IUJ#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 LTC7818IUJ#TRPBF reliable?
The price and inventory of LTC7818IUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7818IUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7818IUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7818IUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7818IUJ#TRPBF?
LTC7818IUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7818IUJ#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 LTC7818IUJ#TRPBF?
For technical support, including LTC7818IUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7818IUJ#TRPBF requirements.
6.How does Aetrix verify that LTC7818IUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7818IUJ#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 LTC7818IUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7818IUJ#TRPBF?
All LTC7818IUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7818IUJ#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 LTC7818IUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC7818IUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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