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Analog Devices Inc. LTC7818EUJ#PBF
- Part No.:
- LTC7818EUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- -
- Datasheet:
-
LTC7818EUJ#PBF.pdf
- Description:
- BUCK/BUCK/BOOST SYNC CTL, 40V, 3
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
LTC7818EUJ#PBF from Analog Devices is a 40V, triple-output synchronous DC/DC controller (buck/buck/boost) driving all-N-channel MOSFET stages. It delivers 3.3V/12A, 5V/10A, and programmable boost output up to 40V with 0.8V buck and 1.2V boost reference accuracy, 14μA no-load IQ, and 3MHz phase-lockable switching frequency - deployed in automotive cold-crank power systems requiring VIN down to 1V operation.
For engineers reviewing the LTC7818EUJ#PBF datasheet, LTC7818EUJ#PBF pinout, LTC7818EUJ#PBF application, or LTC7818EUJ#PBF equivalent, key selection criteria include PassThru™ boost capability at 100% duty cycle, OPTI-LOOP® compensation for wide ESR/output capacitance tolerance, spread spectrum EMI reduction, AEC-Q100 qualification, and dual-buck-plus-boost topology integration in a single 40-lead QFN.
Technical Context
The LTC7818EUJ#PBF implements three independent current-mode control loops: two constant-frequency buck regulators with 0.8V ±12mV feedback reference and one synchronous boost regulator with 1.2V ±18mV reference (or fixed 8V/10V via VPRG3). Each channel supports selectable light-load modes - Burst Mode™, pulse-skipping, or forced continuous - controlled globally by the MODE pin.
Its architecture integrates dedicated gate drivers (2Ω pull-up/pull-down), internal 5.1V INTVCC LDO, EXTVCC switchover at 4.7V, and PLLIN/SPREAD pin enabling synchronization to external clocks (0.1–3MHz) or spread-spectrum modulation. The boost stage includes PassThru™ operation below VOUT, IMON3 current monitor output, and OV3 overvoltage flag with 7–13% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller - enables compact 3-rail power supply with shared bias and timing resources. |
| Input Voltage Range | 4.5V to 40V on VBIAS; operates down to 1V after startup when biased from boost output - essential for automotive start-stop and cold-crank resilience. |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable up to 3MHz - allows EMI optimization and high-density layout with small magnetics. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Channel 1 active) - extends battery runtime in always-on vehicle subsystems. |
| Feedback Reference Accuracy | 0.8V ±12mV (buck), 1.2V ±18mV (boost) - ensures tight output regulation across temperature and line/load variations. |
| Package & Temp Grade | 40-lead 6mm × 6mm QFN (UJ); –40°C to +125°C junction (E-grade) - qualified per AEC-Q100 for under-hood automotive use. |
| Shutdown IQ | 1.5μA - enables ultra-low-power system sleep states without external enable circuitry. |
Pinout & Package
40-lead 6mm × 6mm plastic QFN (UJ package) with exposed thermal pad (Pin 41 = GND). Pin pitch: 0.5mm. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (24) | Main bias supply input | Primary 4.5–40V input powering internal circuits; supports EXTVCC switchover and low-IQ sleep mode. |
| RUN1, RUN2, RUN3 (8,9,10) | Per-channel enable inputs | Logic-high (>1.2V) enables corresponding controller; all <0.7V shuts down entire IC with 1.5μA IQ. |
| BOOST1/2/3 (13,27,15) | High-side gate driver bootstrap supplies | Charge pump outputs for N-channel high-side MOSFET drivers; BOOST3 supports PassThru™ operation. |
| TG1/2/3, BG1/2/3 (14,28,18, 12,26,19) | Gate drive outputs | 2Ω pull-up/pull-down drivers for external N-MOSFETs; TG = top gate, BG = bottom gate per channel. |
| VPRG3 (16) | Boost output voltage programming | Floating → adjustable via VFB3; GND → 8V fixed; INTVCC → 10V fixed - simplifies boost rail configuration. |
| IMON3 (7) | Boost inductor current monitor | Analog voltage output (0.4–1.4V) proportional to boost channel current - enables real-time current sensing without shunt. |
| PLLIN/SPREAD (34) | Synchronization & spread-spectrum control | Accepts external clock (0.1–3MHz) for phase-locking or INTVCC for ±12%/+15% frequency dithering to reduce EMI peaks. |
Key Features
| Feature | Design Value |
|---|---|
| PassThru™ Boost Operation | Enables 100% duty cycle in boost stage when VIN < VOUT, minimizing conduction loss during automotive cold-crank (VIN down to 1V). |
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitor ESR (0.5mΩ–100mΩ) and capacitance (10μF–1000μF), reducing design iterations. |
| Spread Spectrum Modulation | Reduces peak conducted/radiated EMI by spreading switching energy across ±12% (min) to +15% (max) bandwidth - aids CISPR 25 Class 5 compliance. |
| RSENSE or DCR Sensing | Supports either precision shunt resistors or inductor DCR for current sensing - lowers BOM cost and improves thermal efficiency vs. discrete sense resistors. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade E: –40°C to +125°C TJ) with validated reliability testing - suitable for ADAS, infotainment, and body control modules. |
Applications
| Automotive Start-Stop System | Industrial Dual-Rail Power Supply |
|---|---|
Use Scenario: Vehicle engine restart after stop requires stable 3.3V microcontroller and 5V CAN transceiver rails despite battery dip to 1V. IC Role / Device Role / Timing Role: LTC7818EUJ#PBF acts as primary triple-output controller managing buck1 (3.3V/12A), buck2 (5V/10A), and boost (10V) for sensor bias, with PassThru™ maintaining regulation during cold crank. Use Value: Eliminates need for separate boost pre-regulator; 14μA IQ extends accessory mode battery life; AEC-Q100 grade ensures reliability in under-hood environments. |
Use Scenario: Programmable logic controller (PLC) requiring isolated 3.3V I/O, 5V FPGA core, and 12V analog front-end from unregulated 24V DC bus. IC Role / Device Role / Timing Role: LTC7818EUJ#PBF configures buck1 (3.3V), buck2 (5V), and boost (12V) with independent soft-start (TRACK/SS pins) and PGOOD1 monitoring for sequenced power-up. Use Value: Single-chip solution reduces board area vs. three discrete controllers; OPTI-LOOP® accommodates diverse output capacitors; 40V input handles industrial transients. |
| Military Avionics Power Module | Test Equipment Multi-Output Supply |
Use Scenario: Ruggedized flight data recorder needing fault-tolerant 3.3V, 5V, and 15V rails from 28V aircraft bus with EMI constraints. IC Role / Device Role / Timing Role: LTC7818EUJ#PBF provides triple regulated outputs with spread spectrum (PLLIN/SPREAD = INTVCC) and OV3/PGOOD1 fault flags for system-level monitoring. Use Value: 3MHz max frequency enables compact 1μH inductors; –40°C to +125°C operation meets MIL-STD-810H thermal requirements; QFN package supports conformal coating. |
Use Scenario: Bench power supply unit generating user-configurable 3.3V, 5V, and variable 8–24V outputs for DUT testing with minimal ripple and fast transient response. IC Role / Device Role / Timing Role: LTC7818EUJ#PBF serves as programmable triple-output controller where VPRG3 selects boost voltage (8V/10V/floating), and ITH1/2/3 pins adjust current limits per rail. Use Value: Independent TRACK/SS1/2/3 pins allow precise power sequencing; 0.8V/1.2V references ensure <±1% output accuracy; low-noise design minimizes measurement interference. |
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#PBF | Dual-buck-only controller (no boost channel); 40V input; 1.2V reference only for bucks; no VPRG3 or IMON3. | Cannot replace LTC7818EUJ#PBF in boost-required applications; suitable only when third rail is generated externally or via LDO. | Select LTC7813EUJ#PBF only if system uses separate boost converter or fixed 12V auxiliary supply - avoids over-specifying for non-boost use cases. |
| MP2918GL-Z | Triple-output buck/buck/buck controller (Monolithic Power Systems); integrated MOSFETs; max 18V input; no boost capability; no spread spectrum. | Lacks PassThru™, cold-crank support, and 40V input range; limited to lower-voltage industrial applications. | Choose MP2918GL-Z for cost-sensitive, space-constrained designs where 18V input and integrated FETs outweigh need for automotive robustness or boost functionality. |
Compared with LTC7813EUJ#PBF and MP2918GL-Z, the LTC7818EUJ#PBF uniquely combines triple-output buck/buck/boost topology, 40V input, 1V cold-crank operation, and AEC-Q100 qualification - making it irreplaceable in automotive multi-rail systems requiring regulated boost output.
Availability
LTC7818EUJ#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial PLCs, military avionics, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LTC7818EUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and defense markets.
The LTC7818EUJ#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, multi-rail DC/DC conversion in harsh environments - emphasizing low IQ, wide input range, and automotive-grade reliability.
FAQ
What is the minimum input voltage required for LTC7818EUJ#PBF to operate after startup?
The LTC7818EUJ#PBF can maintain regulation with input voltage as low as 1V after startup when biased from the boost output or another auxiliary supply. This capability is critical for automotive cold-crank scenarios where battery voltage dips transiently below 5V. The 4.5V to 40V VBIAS operating range applies during initial startup and normal operation.
How does the LTC7818EUJ#PBF achieve EMI reduction without external filters?
The LTC7818EUJ#PBF incorporates spread spectrum modulation via its PLLIN/SPREAD pin, dithering the switching frequency by ±12% minimum to +15% maximum. This spreads electromagnetic energy across a wider bandwidth, significantly lowering peak radiated and conducted emissions - easing compliance with CISPR 25 Class 5 and FCC Part 15 standards without adding bulk filter components.
Can the LTC7818EUJ#PBF generate a fixed 10V boost output without external resistors?
Yes. Connecting the VPRG3 pin (Pin 16) to INTVCC configures the LTC7818EUJ#PBF for a fixed 10V boost output, with VFB3 internally tied to the output. This eliminates the need for external feedback resistors and simplifies design for applications requiring a stable 10V rail, such as sensor bias or analog circuitry.
What is the purpose of the IMON3 pin on the LTC7818EUJ#PBF?
The IMON3 pin (Pin 7) on the LTC7818EUJ#PBF provides an analog voltage output (0.4V to 1.4V) proportional to the boost channel inductor current. This enables real-time current monitoring for protection, telemetry, or closed-loop control without requiring a discrete current-sense resistor - reducing power loss and board space in high-current boost applications.
Does the LTC7818EUJ#PBF support power sequencing between its three outputs?
Yes. The LTC7818EUJ#PBF supports independent power sequencing via TRACK/SS1, TRACK/SS2, and SS3 pins. These pins accept external ramp voltages or soft-start capacitors to control the turn-on timing and slew rate of each output, ensuring proper voltage sequencing for FPGAs, processors, and mixed-signal ICs that require strict power-up order.
LTC7818EUJ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- 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):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LTC7818EUJ#PBF FAQ
1.How can I place an order for LTC7818EUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7818EUJ#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 LTC7818EUJ#PBF reliable?
The price and inventory of LTC7818EUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7818EUJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC7818EUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7818EUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7818EUJ#PBF?
LTC7818EUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7818EUJ#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 LTC7818EUJ#PBF?
For technical support, including LTC7818EUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7818EUJ#PBF requirements.
6.How does Aetrix verify that LTC7818EUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7818EUJ#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 LTC7818EUJ#PBF meets industry standards.
7.What is the process for return or replacement of LTC7818EUJ#PBF?
All LTC7818EUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7818EUJ#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 LTC7818EUJ#PBF part is unused and in its original packaging.
Return procedure for LTC7818EUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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