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Analog Devices Inc. LTC7818JUJ#PBF
- Part No.:
- LTC7818JUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC7818JUJ#PBF.pdf
- Description:
- BUCK/BUCK/BOOST SYNC CTL, 40V, 3
- Quantity:
- Payment:
- Shipping:
Inventory:4,967
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Product details
Overview
LTC7818JUJ#PBF from Analog Devices is a high-performance triple-output synchronous DC/DC controller implementing buck/buck/boost topology with all-N-channel MOSFET drive capability. It delivers 3.3V/12A, 5V/10A, and regulated 10V boost output (or VIN-following above 10V) across 4.5V–40V input, supports cold-crank down to 1V after startup, and features 14μA no-load IQ - enabling robust power management in automotive start-stop systems.
For engineers reviewing the LTC7818JUJ#PBF datasheet, LTC7818JUJ#PBF pinout, LTC7818JUJ#PBF application, or LTC7818JUJ#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 3MHz phase-lockable switching frequency, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, PassThru™ boost operation, and spread spectrum EMI reduction - all in a thermally enhanced 40-lead 6mm × 6mm QFN package.
Technical Context
The LTC7818JUJ#PBF integrates three independent current-mode controllers: two constant-frequency buck regulators (0.8V reference, up to 40V output) and one synchronous boost regulator (1.2V reference, up to 40V output). Its architecture supports programmable fixed frequency (100kHz–3MHz), phase-locking via PLLIN/SPREAD, and selectable light-load modes (Burst, Pulse-Skipping, Forced Continuous).
It employs RSENSE or DCR current sensing per channel, provides dedicated ITH pins for loop compensation, and includes integrated INTVCC (5.1V LDO) and EXTVCC switchover logic. The boost channel supports PassThru™ operation at 100% duty cycle and features IMON3 current monitor output with 0.4V–1.4V linear scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller with all-N-MOSFET drive |
| Input Voltage Range | 4.5V–40V main bias; operates down to 1V after startup when biased from boost output or auxiliary supply |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable up to 3MHz via external clock |
| No-Load Quiescent Current | 14μA (14V→3.3V, Channel 1 active); 1.5μA shutdown current |
| Reference Voltages | 0.8V ±12mV (buck channels), 1.2V ±13mV (boost channel, VPRG3 = FLOAT) |
| Operating Junction Temp | –40°C to +150°C (J-grade, qualified per AEC-Q100 Grade 1) |
| EMI Reduction | Integrated spread spectrum modulation reduces peak conducted/radiated noise |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN with exposed pad (Pin 41 = GND), θJA = 33°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (1) | Light-load operation mode select | Ground = Burst Mode; INTVCC = Forced Continuous; INTVCC via 100kΩ = Pulse-Skipping |
| IMON3 (7) | Boost channel current monitor output | Analog voltage (0.4V–1.4V) proportional to inductor current; enables real-time current monitoring |
| RUN1, RUN2, RUN3 (8–10) | Per-channel enable/disable control | <1.1V disables corresponding channel; all <0.7V enters ultra-low-IQ shutdown (1.5μA) |
| VPRG3 (16) | Boost output voltage programming | Floating = resistor-programmed via VFB3 (1.2V ref); GND = 8V fixed; INTVCC = 10V fixed |
| OV3 (17) | Boost overvoltage indicator | Open-drain output pulled low when VFB3 < 90% setpoint; high-Z when ≥110% setpoint |
| INTVCC (22) | Internal 5.1V LDO output | Supplies gate drivers and internal circuitry; requires ≥4.7μF ceramic decoupling to GND |
| EXTVCC (23) | External bias input for INTVCC LDO | Enables switchover to external supply when >4.7V; bypasses internal VBIAS LDO for efficiency |
| VBIAS (24) | Main bias supply input | Primary power source for internal circuitry; accepts 4.5V–40V; requires local bypass capacitor |
| PLLIN/SPREAD (34) | Phase-lock/synchronization & spread spectrum control | Accepts external clock (0.1–3MHz) for synchronization; INTVCC enables spread spectrum modulation |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output buck/buck/boost architecture | Enables single-chip generation of multiple isolated rail voltages (e.g., 3.3V, 5V, 10V) from wide-input automotive or industrial supplies |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including start-stop, cold-crank (down to 1V), and under-hood temperature cycling (–40°C to +150°C) |
| PassThru™ synchronous boost | Allows 100% duty-cycle operation to pass input directly to output during low-VIN conditions, minimizing conduction loss and thermal stress |
| OPTI-LOOP® compensation | Supports stable loop response across broad range of output capacitor types (ceramic, polymer, electrolytic) and ESR values without redesign |
| Spread spectrum modulation | Reduces peak EMI amplitude by spreading switching energy across frequency band - simplifies compliance with CISPR 25 Class 5 |
| Low 14μA no-load IQ | Extends battery runtime in always-on systems (e.g., telematics, ADAS sensors) while maintaining regulation on all outputs |
Applications
| Automotive Start-Stop Systems | Industrial Control Power Supplies |
|---|---|
Use Scenario: Powering infotainment, ADAS cameras, and body control modules during engine cranking where battery voltage dips to 1V. IC Role / Device Role / Timing Role: Triple-output controller delivering regulated 3.3V, 5V, and 10V rails while maintaining regulation through cold-crank events using PassThru™ boost and 1V startup capability. Use Value: Eliminates need for discrete boost backup stage; ensures uninterrupted operation of safety-critical ECUs during transient low-voltage conditions. |
Use Scenario: Generating multiple isolated DC rails (e.g., 3.3V for MCU, 5V for I/O, 12V for actuators) from unregulated 24V industrial bus. IC Role / Device Role / Timing Role: High-efficiency synchronous controller supporting wide input range (4.5V–40V), programmable frequency, and robust thermal performance up to +150°C junction. Use Value: Reduces BOM count and board area vs. discrete controllers; spread spectrum lowers EMI filter cost in noisy factory environments. |
| Military Avionics Power Distribution | High-Reliability Telematics Gateways |
Use Scenario: Providing fault-tolerant, multi-rail power to mission-critical avionics subsystems operating across extreme temperature ranges. IC Role / Device Role / Timing Role: AEC-Q100 qualified triple controller with independent RUN pin control, PGOOD1, OV3 indicators, and overtemperature protection. Use Value: Enables graceful channel shutdown and system-level fault reporting without full system reset - critical for DO-254 compliance. |
Use Scenario: Powering LTE/V2X modems, GNSS receivers, and microcontrollers in vehicle-to-everything (V2X) gateways requiring long-term battery-backed operation. IC Role / Device Role / Timing Role: Ultra-low 14μA quiescent current controller sustaining 3.3V/5V rails during sleep mode while retaining fast wake-up capability. Use Value: Extends backup battery life from days to months; OPTI-LOOP® ensures stable regulation despite aging of backup supercapacitors. |
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 |
|---|---|---|---|
| LTC7817JUJ#PBF | Dual-buck + single-boost architecture; lacks third independent buck channel; same 40-pin QFN package and AEC-Q100 J-grade rating | Suitable only for dual-rail systems; cannot support three independent regulated outputs simultaneously | Select when only two buck outputs are required - reduces complexity and cost while retaining identical thermal and EMI performance |
| MP2918GL-Z | Triple-output buck-only controller (no boost); 2.2MHz max frequency; 20μA IQ; QFN-32 package; not AEC-Q100 qualified | Cannot regulate output above input voltage; unsuitable for cold-crank or 12V→10V boost scenarios | Consider for cost-sensitive industrial applications where input always exceeds all output requirements and automotive qualification is unnecessary |
Compared with LTC7817JUJ#PBF and MP2918GL-Z, the LTC7818JUJ#PBF uniquely combines triple-output flexibility (buck/buck/boost), AEC-Q100 Grade 1 qualification, 1V cold-crank operation, and PassThru™ boost - making it the only option capable of replacing legacy discrete solutions in next-generation automotive power architectures.
Availability
LTC7818JUJ#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial control power supplies, military avionics distribution, and high-reliability telematics gateways requiring stable component supply, extended temperature operation, and long-term lifecycle support.
Supply support for LTC7818JUJ#PBF 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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC7818JUJ#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, high-reliability DC/DC controllers engineered specifically for demanding automotive and industrial applications requiring wide input range, ultra-low quiescent current, and AEC-Q100 qualification.
FAQ
What is the minimum input voltage required for LTC7818JUJ#PBF to operate after startup?
The LTC7818JUJ#PBF can maintain regulation with input as low as 1V after startup when biased from the boost output or an auxiliary supply. This capability is essential for automotive cold-crank conditions. During initial startup, however, the VBIAS supply must be ≥4.5V. The LTC7818JUJ#PBF achieves this dual-range operation via internal bias switching between VBIAS and EXTVCC/INTVCC paths.
Does LTC7818JUJ#PBF support synchronization to an external clock source?
Yes, the LTC7818JUJ#PBF supports full phase-locking via the PLLIN/SPREAD pin, accepting external clock inputs from 100kHz to 3MHz. When driven by a clean system clock, it eliminates beat frequencies and reduces EMI peaks - critical for compliance in automotive EMC testing. The LTC7818JUJ#PBF also allows spread spectrum modulation when PLLIN/SPREAD is tied to INTVCC.
How does the PassThru™ feature work in LTC7818JUJ#PBF's boost channel?
The LTC7818JUJ#PBF's PassThru™ mode enables 100% duty-cycle operation in the boost channel when input voltage falls below the programmed output (e.g., VIN < 10V). Instead of discontinuous switching, the synchronous MOSFET remains fully on, passing input directly to output with minimal dropout - reducing losses, heat, and voltage ripple during automotive cranking events. This behavior is automatic and requires no external control.
What are the voltage references used by LTC7818JUJ#PBF for regulation?
The LTC7818JUJ#PBF uses a precision 0.8V reference for both buck channels (VFB1, VFB2) and a 1.2V reference for the boost channel (VFB3). These references are trimmed and specified over temperature: buck reference is 0.788V–0.812V (±1.5%) and boost reference is 1.177V–1.213V (±1.5%) across –40°C to +125°C. The LTC7818JUJ#PBF maintains these tolerances using internal bandgap circuitry and curvature compensation.
Is LTC7818JUJ#PBF compatible with DCR current sensing on all three channels?
Yes, the LTC7818JUJ#PBF supports DCR current sensing on all three channels (buck1, buck2, boost3) using the SENSE+ and SENSE– pins. Each channel includes dedicated amplifier inputs with matched offset and gain characteristics. The datasheet provides design equations and layout guidance for DCR sense networks, including RC filtering to reject switching noise - ensuring accurate current limiting and loop stability across load and temperature.
LTC7818JUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC7818JUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7818JUJ#PBF 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#PBF reliable?
The price and inventory of LTC7818JUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7818JUJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC7818JUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7818JUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7818JUJ#PBF?
LTC7818JUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7818JUJ#PBF 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#PBF?
For technical support, including LTC7818JUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7818JUJ#PBF requirements.
6.How does Aetrix verify that LTC7818JUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7818JUJ#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC7818JUJ#PBF?
All LTC7818JUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7818JUJ#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC7818JUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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