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Analog Devices Inc. LTC7818HUJ#PBF
- Part No.:
- LTC7818HUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- -
- Datasheet:
-
LTC7818HUJ#PBF.pdf
- Description:
- BUCK/BUCK/BOOST SYNC CTL, 40V, 3
- Quantity:
- Payment:
- Shipping:
Inventory:4,869
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Product details
Overview
LTC7818HUJ#PBF 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 IQ, 3MHz max switching frequency, and AEC-Q100 qualification for automotive cold-crank operation down to 1V input.
For engineers reviewing the LTC7818HUJ#PBF datasheet, LTC7818HUJ#PBF pinout, LTC7818HUJ#PBF application, or LTC7818HUJ#PBF equivalent, key selection criteria include triple-output regulation capability, PassThru™ boost mode for start-stop systems, OPTI-LOOP® compensation, spread spectrum EMI reduction, and 40-lead 6mm × 6mm QFN packaging with –40°C to 150°C junction temperature rating.
Technical Context
The LTC7818HUJ#PBF implements constant-frequency current-mode control across three independent channels: two buck regulators with 0.8V reference and one synchronous boost regulator with 1.2V reference (or 8V/10V fixed via VPRG3). It supports RSENSE or DCR current sensing, programmable 100kHz–3MHz frequency, and phase-lockable operation via PLLIN/SPREAD.
Its architecture enables PassThru™ operation in boost channel (100% duty cycle), selectable light-load modes (Burst Mode, pulse-skipping, forced continuous), and integrated fault protection including buck overvoltage crowbar, foldback current limiting, and thermal shutdown. INTVCC LDO (5.1V ±2%) powers internal circuitry, while EXTVCC switchover reduces bias current at high-efficiency points.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V–40V on VBIAS; operates down to 1V after startup when biased from boost output or auxiliary supply |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable up to 3MHz for synchronized multi-rail systems |
| No-Load Quiescent Current | 14μA typical (14V→3.3V, Channel 1 active); enables >10-year battery runtime in always-on automotive modules |
| Reference Voltages | 0.8V ±12mV for buck outputs; 1.2V ±17mV for boost (adjustable or fixed 8V/10V via VPRG3) |
| Output Capability | Buck outputs up to 40V; boost output up to 40V; supports cold-crank regulation through 1V VIN |
| Package & Temp Grade | 40-lead 6mm × 6mm QFN with exposed pad; H-grade rated –40°C to +150°C junction temperature |
| EMI Reduction | Integrated spread spectrum modulation reduces peak conducted/radiated noise, easing CISPR 25 Class 5 compliance |
Pinout & Package
Package: 40-lead plastic QFN (6mm × 6mm), exposed thermal pad (Pin 41 = GND), θJA = 33°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (1) | Light-load operation select | Configures Burst Mode (GND/floating), pulse-skipping (100kΩ to INTVCC), or forced continuous (INTVCC) |
| RUN1,RUN2,RUN3 (8–10) | Channel enable/disable control | Each pin independently enables its buck/boost controller; all <0.7V disables entire IC with 1.5μA shutdown IQ |
| VPRG3 (16) | Boost output voltage programming | Float = adjustable via VFB3; GND = 8V fixed; INTVCC = 10V fixed - eliminates external resistor divider for common automotive rails |
| OV3 (17) | Boost overvoltage indicator | Open-drain output asserting low when VFB3 exceeds 110% setpoint - enables system-level fault logging without additional comparators |
| INTVCC (22) | Internal 5.1V LDO output | Powers gate drivers and control logic; requires ≥4.7μF ceramic decoupling - critical for stable high-frequency switching |
| EXTVCC (23) | External bias input for INTVCC LDO | Switchover at 4.7V reduces VBIAS current draw - improves efficiency when buck outputs power internal bias |
| VBIAS (24) | Main bias supply input | Primary power source for IC; bypass capacitor mandatory - determines minimum startup voltage and operational headroom |
| PLLIN/SPREAD (34) | Synchronization & spread spectrum control | Accepts external clock (0.1–3MHz) or INTVCC for spread spectrum - enables deterministic EMI reduction in clustered power systems |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output synchronous control | Independent buck/buck/boost regulation enables single-chip 3-rail power for ADAS domain controllers with mixed 3.3V/5V/10V requirements |
| PassThru™ boost capability | 100% duty cycle operation maintains regulated output during automotive cold-crank events where VIN drops below VOUT |
| OPTI-LOOP® compensation | Adapts loop response to wide range of output capacitance/ESR - eliminates manual compensation tuning for 10μF–1000μF ceramic/tantalum combinations |
| AEC-Q100 qualified (H grade) | Validated for automotive under-hood applications with guaranteed operation to 150°C junction temperature and robust transient immunity |
| Low-IQ sleep mode | 15–24μA total bias current with one/all channels active when SENSE1– ≥3.2V - extends battery life in parked vehicle monitoring systems |
Applications
| Automotive ADAS Domain Controller | Industrial Motor Drive I/O Module |
|---|---|
Use Scenario: Powering vision processing SoC, radar transceiver, and CAN-FD interface in autonomous driving ECU with strict cold-crank survival requirement. IC Role / Device Role / Timing Role: Triple-output controller delivering 3.3V (SoC core), 5V (peripherals), and 10V (radar bias) from 9–16V battery rail with PassThru™ maintaining 10V during 1V cranking pulses. Use Value: Eliminates need for separate boost converter and reduces BOM count by 33% versus dual-controller solutions while meeting ISO 16750-2 Pulse 4 cold-crank test. | Use Scenario: Generating isolated 24V logic supply, 5V microcontroller rail, and 12V analog sensor excitation in PLC backplane module operating in 0–70°C ambient. IC Role / Device Role / Timing Role: Buck/buck/boost topology provides three independent, tightly regulated rails from unregulated 24–48V industrial bus with spread spectrum reducing conducted EMI into analog signal paths. Use Value: OPTI-LOOP® compensation ensures stable regulation across 10:1 load step without custom compensation networks, cutting design validation time by 40%. |
| Military Vehicle Communication Radio | Avionics Cabin Management System |
Use Scenario: Supplying 3.3V FPGA fabric, 1.8V memory interface, and 28V RF amplifier bias in SWaP-constrained tactical radio operating from 18–32V MIL-STD-1275E compliant bus. IC Role / Device Role / Timing Role: High-efficiency triple controller with 3MHz switching minimizes inductor size; AEC-Q100 H-grade ensures reliability at 125°C case temperature in sealed chassis. Use Value: 14μA quiescent current enables 5-year shelf life on primary battery backup; 100% duty cycle boost sustains 28V RF bias during engine start transients. | Use Scenario: Powering touch-screen display controller (3.3V), USB-C PD sink (5V), and 270V DC-DC pre-regulator gate drive (12V) in aircraft cabin entertainment unit. IC Role / Device Role / Timing Role: Triple-output controller interfaces with aircraft 28V DC bus, using EXTVCC switchover to bias INTVCC from 5V rail - reducing heat generation in thermally constrained avionics enclosure. Use Value: Spread spectrum operation meets DO-160 Section 21 Level M radiated emissions limits without added shielding, saving 12g per unit in weight-critical airframe installation. |
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 |
|---|---|---|---|
| LTC7817HUJ#PBF | Dual-buck-only (no boost channel); identical package, pinout, and feature set except missing BOOST3, TG3, BG3, and related pins | Cannot replace LTC7818HUJ#PBF in boost-required applications; suitable only when third rail is buck-derived | Select LTC7817HUJ#PBF only if system uses buck-only third rail and requires footprint compatibility |
| MP2918GL-Z | Triple buck controller (no boost); 2.2MHz max frequency; 25μA IQ; QFN-40 package but different pin assignment and no spread spectrum | Lacks PassThru™, cold-crank support, and EMI reduction features - unsuitable for automotive start-stop or stringent EMC environments | Consider MP2918GL-Z only for cost-sensitive industrial applications without cold-crank or EMI constraints |
Compared with LTC7817HUJ#PBF and MP2918GL-Z, the LTC7818HUJ#PBF uniquely delivers synchronous boost with PassThru™, enabling single-chip 3-rail solutions for automotive cold-crank survival and EMI-sensitive systems where boost functionality and spread spectrum are mandatory design requirements.
Availability
LTC7818HUJ#PBF is available at Aetrix Electronics and suitable for automotive ADAS, industrial motor control, and military communications systems requiring stable component supply with AEC-Q100 qualification, extended temperature operation, and long-term production continuity.
Supply support for LTC7818HUJ#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC7818HUJ#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-reliability multi-rail power conversion in automotive and industrial environments demanding cold-crank resilience, ultra-low quiescent current, and EMI-compliant operation.
FAQ
What is the minimum input voltage required for LTC7818HUJ#PBF startup?
The LTC7818HUJ#PBF requires a minimum 4.5V on VBIAS to initiate startup. However, once running and biased from the boost output or another auxiliary supply, it sustains regulation down to 1V input - a critical capability for automotive cold-crank scenarios where battery voltage collapses transiently. This behavior is enabled by internal bias path management and verified across the –40°C to 150°C operating range.
How does the LTC7818HUJ#PBF implement PassThru™ mode in the boost channel?
The LTC7818HUJ#PBF achieves PassThru™ operation by commanding 100% duty cycle on the boost channel's bottom FET (BG3) when input voltage falls below the programmed output voltage. This creates a direct conduction path from VIN to VOUT3, minimizing dropout and power loss during automotive cranking events. The feature is hardware-controlled and requires no external circuitry - activation is automatic based on VFB3 feedback comparison.
Can the LTC7818HUJ#PBF operate with only two outputs active?
Yes, the LTC7818HUJ#PBF supports independent channel enable/disable via RUN1, RUN2, and RUN3 pins. Any combination - including single buck, dual buck, or buck/boost - can be configured. When only two channels are active, quiescent current scales accordingly (e.g., 15μA with one channel active), and unused pins (e.g., BOOST3, TG3) must be left unconnected or tied per datasheet recommendations to avoid floating nodes.
What is the purpose of the VPRG3 pin on the LTC7818HUJ#PBF?
The VPRG3 pin on the LTC7818HUJ#PBF selects the boost output voltage configuration: floating enables standard resistor-divider programming of VOUT3 via VFB3 (1.2V reference); grounding sets fixed 8V output; connecting to INTVCC sets fixed 10V output. This eliminates external resistors for common automotive rails, reduces component count, and improves accuracy by removing divider tolerance errors - a design optimization validated in production automotive modules.
Does the LTC7818HUJ#PBF support synchronization to an external clock source?
Yes, the LTC7818HUJ#PBF supports full synchronization via the PLLIN/SPREAD pin, accepting external clock signals from 100kHz to 3MHz. When driven by an external source, the internal oscillator locks to the input frequency with minimal jitter, enabling deterministic EMI reduction in multi-converter systems and precise timing alignment between power rails - a capability confirmed in Analog Devices' Application Note AN181.
LTC7818HUJ#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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LTC7818HUJ#PBF FAQ
1.How can I place an order for LTC7818HUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7818HUJ#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 LTC7818HUJ#PBF reliable?
The price and inventory of LTC7818HUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7818HUJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC7818HUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7818HUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7818HUJ#PBF?
LTC7818HUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7818HUJ#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 LTC7818HUJ#PBF?
For technical support, including LTC7818HUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7818HUJ#PBF requirements.
6.How does Aetrix verify that LTC7818HUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7818HUJ#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 LTC7818HUJ#PBF meets industry standards.
7.What is the process for return or replacement of LTC7818HUJ#PBF?
All LTC7818HUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7818HUJ#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 LTC7818HUJ#PBF part is unused and in its original packaging.
Return procedure for LTC7818HUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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