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Analog Devices Inc. LTC7818JUJ#TRPBF
- Part No.:
- LTC7818JUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC7818JUJ#TRPBF.pdf
- Description:
- BUCK/BUCK/BOOST SYNC CTL, 40V, 3
- Quantity:
- Payment:
- Shipping:
Inventory:4,850
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Product details
Overview
LTC7818JUJ#TRPBF from Analog Devices is a high-performance triple-output synchronous DC/DC controller (buck/buck/boost) driving all-N-channel MOSFET stages, operating from 4.5V–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 delivers regulated 3.3V/12A, 5V/10A, and programmable boost outputs in a single 6mm × 6mm QFN.
For engineers reviewing the LTC7818JUJ#TRPBF datasheet, LTC7818JUJ#TRPBF pinout, LTC7818JUJ#TRPBF application, or LTC7818JUJ#TRPBF equivalent, key selection criteria include its triple-output topology, PassThru™ boost capability at 100% duty cycle, OPTI-LOOP® compensation, spread spectrum EMI reduction, and dual-buck-plus-boost channel coordination under wide VIN and temperature ranges.
Technical Context
The LTC7818JUJ#TRPBF implements three independent constant-frequency current-mode control loops: two buck channels with 0.8V reference and one boost channel with 1.2V (or 8V/10V fixed) reference. Its architecture supports phase-lockable frequency synchronization (100kHz–3MHz), selectable light-load modes (Burst, Pulse-Skipping, Forced Continuous), and RSENSE/DCR current sensing per channel.
It integrates dedicated gate drivers (2Ω pull-up/pull-down), INTVCC LDO (5.1V ±2%), EXTVCC switchover (4.7V threshold), and precision monitoring functions including PGOOD1, OV3, and IMON3 current monitor output. The controller maintains regulation during automotive cold-crank events and enables low-IQ operation via SENSE1– biasing and EXTVCC power routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller - enables compact multi-rail power systems without external drivers. |
| Input Voltage Range | 4.5V to 40V (VBIAS); post-startup operation down to 1V (VIN) when biased from boost output - supports automotive battery transients. |
| Switching Frequency | Programmable 100kHz to 3MHz; phase-lockable via PLLIN/SPREAD - allows EMI optimization and clock synchronization across multiple rails. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Channel 1 active) - extends battery runtime in always-on vehicle modules. |
| Reference Voltages | 0.8V ±1.5% (buck), 1.2V ±1.5% (boost, floating VPRG3); 8V/10V fixed options (VPRG3 = GND/INTVCC) - enables precise, stable output regulation. |
| Operating Junction Temp | –40°C to +150°C (J-grade) - qualified per AEC-Q100 Grade 1 for under-hood automotive applications. |
| Package | 40-lead 6mm × 6mm QFN with exposed thermal pad - provides low θJA (33°C/W) for high-power density designs. |
Pinout & Package
Package: 40-lead plastic QFN (6mm × 6mm), exposed pad (Pin 41) connected to GND. Thermal pad must be soldered to PCB for reliable thermal performance and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 41) | Power and signal ground reference | Exposed thermal pad; mandatory solder connection to PCB ground plane for thermal dissipation and noise immunity. |
| RUN1, RUN2, RUN3 (Pins 8–10) | Channel enable/disable control inputs | Each independently disables corresponding buck/boost controller; all <0.7V shuts down entire IC with 1.5μA shutdown IQ. |
| VPRG3 (Pin 16) | Boost output voltage programming selector | Configures boost output as adjustable (floating), 8V (GND), or 10V (INTVCC) - eliminates need for external feedback divider in fixed-voltage use cases. |
| IMON3 (Pin 7) | Boost inductor current monitor analog output | 0.4V–1.4V voltage proportional to boost channel current - enables real-time current sensing without shunt resistor. |
| PLLIN/SPREAD (Pin 34) | Frequency sync input / spread-spectrum enable | Accepts external clock (0.1–3MHz) for synchronization; driven high to activate spread spectrum - reduces peak EMI by >10dB. |
| MODE (Pin 1) | Light-load operation mode select | Ground = Burst Mode; INTVCC = forced continuous; 100kΩ to INTVCC = pulse-skipping - optimizes efficiency vs. ripple trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| PassThru™ Boost Operation | Enables 100% duty cycle on boost channel BG MOSFET - maintains regulation during automotive start-stop with minimal conduction loss. |
| OPTI-LOOP® Compensation | Adapts loop response to wide range of output capacitor ESR and capacitance values - simplifies stability tuning across diverse output filter designs. |
| Spread Spectrum Modulation | Reduces peak conducted and radiated EMI without external filters - accelerates EMC compliance for automotive and industrial systems. |
| Triple Independent Soft-Start | TRACK/SS1, TRACK/SS2, SS3 pins allow sequenced startup and voltage tracking between rails - prevents back-feeding and inrush current conflicts. |
| Low-IQ Bias Routing | SENSE1– and EXTVCC pins accept auxiliary bias current - reduces total VBIAS supply current by redirecting bias to buck output rails. |
Applications
| Automotive Infotainment Power Supply | ADAS Domain Controller Core Rails |
|---|---|
|
Use Scenario: Powering SoC, DDR memory, and display interfaces in head-unit systems subject to cold-crank (1V–16V battery transients). IC Role / Device Role / Timing Role: Triple-output controller generating 1.1V/3A (SoC core), 3.3V/2A (I/O), and 5V/3A (USB/PCIe) from 12V battery. Use Value: Maintains regulation during 1V cold-crank events; PassThru™ minimizes dropout loss; AEC-Q100 J-grade ensures reliability at 150°C junction. |
Use Scenario: Supplying radar processor, camera ISP, and CAN/FlexRay transceivers in centralized ADAS ECUs. IC Role / Device Role / Timing Role: Generates synchronized 1.8V/6A (processor), 1.2V/4A (memory), and 3.3V/5A (peripherals) with precise sequencing. Use Value: TRACK/SS pins enable controlled power-up order; spread spectrum meets CISPR 25 Class 5 emissions limits; 3MHz switching enables small magnetics. |
| Industrial PLC I/O Module | Military Vehicle Communication System |
|
Use Scenario: Providing isolated field-side power (24V input) for analog sensor front-ends, digital I/O, and microcontroller in harsh factory environments. IC Role / Device Role / Timing Role: Buck/buck/boost configuration delivers 5V/2A (MCU), 3.3V/1.5A (ADC/DAC), and 12V/1A (sensor excitation) from 24V rail. Use Value: Wide 4.5V–40V input handles brownouts and surges; 14μA IQ extends backup battery life; RSENSE/DCR flexibility supports cost-optimized current sensing. |
Use Scenario: Powering encrypted radio baseband, RF front-end, and GPS receiver in mobile tactical radios operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Generates 1.0V/8A (baseband ASIC), 2.5V/3A (RF synthesizer), and 5V/4A (GPS module) with fault reporting via PGOOD1/OV3. Use Value: –40°C to +150°C operation supports extended thermal envelope; IMON3 enables current telemetry for health monitoring; robust UVLO prevents erratic startup. |
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 controller (no boost channel); 40V input; 125°C max junction temp; no VPRG3 or IMON3. | Suitable only where third rail is generated externally or via separate boost IC - lacks integrated boost functionality. | Select when system requires only two regulated rails and lower cost/complexity is prioritized over integration. |
| MP2918GL-Z | Triple-output buck-only controller (no boost); 28V input; 125°C rating; integrated MOSFET drivers but no spread spectrum or PassThru™. | Cannot support boost-derived rails or cold-crank below 4.5V; limited EMI mitigation features compared to LTC7818JUJ#TRPBF. | Consider for non-automotive industrial applications where input stays above 4.5V and boost functionality is unnecessary. |
Compared with LTC7813IUJ#TRPBF and MP2918GL-Z, the LTC7818JUJ#TRPBF uniquely integrates a fully featured synchronous boost channel with PassThru™, AEC-Q100 J-grade reliability, and spread spectrum - making it the only option among the three capable of replacing discrete buck+boost solutions in automotive cold-crank systems.
Availability
LTC7818JUJ#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 LTC7818JUJ#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 power management semiconductors, serving automotive, industrial, communications, and defense markets with precision, reliability, and innovation.
The LTC7818JUJ#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, multi-rail DC/DC conversion in demanding automotive and industrial environments where input transients, thermal stress, and EMI compliance are critical.
FAQ
What is the maximum operating junction temperature for the LTC7818JUJ#TRPBF?
The LTC7818JUJ#TRPBF is rated for –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. This specification is guaranteed per the datasheet's Absolute Maximum Ratings table and confirmed in the Order Information section for the J-grade variant. Thermal design must ensure θJA ≤ 33°C/W with proper PCB copper and exposed pad soldering to maintain reliability at full load.
Does the LTC7818JUJ#TRPBF support spread spectrum operation, and how is it enabled?
Yes, the LTC7818JUJ#TRPBF supports spread spectrum modulation to reduce EMI peaks. It is enabled by driving the PLLIN/SPREAD pin to INTVCC (typically 5.1V). When asserted, the internal oscillator modulates frequency by ±12% minimum, significantly lowering conducted and radiated emissions - a key feature verified in the Electrical Characteristics table (fOSC spread range) and Applications Information section.
How does the PassThru™ capability of the LTC7818JUJ#TRPBF improve automotive start-stop performance?
The LTC7818JUJ#TRPBF's PassThru™ feature allows the boost channel's bottom-gate MOSFET to operate at 100% duty cycle, effectively connecting VIN directly to VOUT3 when VIN ≥ VOUT3. This eliminates switching losses during engine cranking (e.g., 1V–12V battery dips), maintaining regulated output with minimal dropout - a function explicitly documented in the Description and Features sections and validated in the Typical Application waveform (TA01b).
Can the LTC7818JUJ#TRPBF generate fixed 8V or 10V boost output without external resistors?
Yes. The LTC7818JUJ#TRPBF supports fixed boost voltages via the VPRG3 pin: tying VPRG3 to GND configures VOUT3 to 8V, and tying it to INTVCC sets VOUT3 to 10V - both with VFB3 shorted directly to the output. This eliminates external feedback dividers and is specified in the Electrical Characteristics table (VFB3 rows) and Pin Functions description for VPRG3.
What is the minimum on-time specification for buck and boost channels in the LTC7818JUJ#TRPBF?
The LTC7818JUJ#TRPBF specifies tON(MIN)1,2 = 40ns for buck channels and tON(MIN)3 = 80ns for the boost channel, as listed in the Electrical Characteristics table under "Maximum Duty Factor" and "Minimum On-Time" subsections. These values define the shortest controllable pulse width, limiting minimum achievable output voltage at high input-to-output ratios - critical for high-VIN, low-VOUT designs.
LTC7818JUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC7818JUJ#TRPBF FAQ
1.How can I place an order for LTC7818JUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7818JUJ#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 LTC7818JUJ#TRPBF reliable?
The price and inventory of LTC7818JUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7818JUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7818JUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7818JUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7818JUJ#TRPBF?
LTC7818JUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7818JUJ#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 LTC7818JUJ#TRPBF?
For technical support, including LTC7818JUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7818JUJ#TRPBF requirements.
6.How does Aetrix verify that LTC7818JUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7818JUJ#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 LTC7818JUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7818JUJ#TRPBF?
All LTC7818JUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7818JUJ#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 LTC7818JUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC7818JUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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