My Inquiry
My Account
Analog Devices Inc. LTC7818HUJ#TRPBF
- Part No.:
- LTC7818HUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- -
- Datasheet:
-
LTC7818HUJ#TRPBF.pdf
- Description:
- BUCK/BUCK/BOOST SYNC CTL, 40V, 3
- Quantity:
- Payment:
- Shipping:
Inventory:1,204
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7818HUJ#TRPBF 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 programmable boost output up to 10V in automotive cold-crank scenarios (1V input), features 14μA no-load IQ, 3MHz max switching frequency, and AEC-Q100 qualification for under-hood power systems.
For engineers reviewing the LTC7818HUJ#TRPBF datasheet, LTC7818HUJ#TRPBF pinout, LTC7818HUJ#TRPBF application, or LTC7818HUJ#TRPBF equivalent, key selection criteria include cold-crank regulation down to 1V input, PassThru™ boost operation, spread-spectrum EMI reduction, OPTI-LOOP® compensation, and triple-channel independent RUN/SS control for staged power sequencing in automotive ADAS and infotainment systems.
Technical Context
The LTC7818HUJ#TRPBF uses constant-frequency current-mode control across three independent channels: two synchronous buck controllers (0.8V reference, 40V max VOUT) and one synchronous boost controller (1.2V reference, 40V max VOUT). Its architecture supports phase-lockable frequency (100kHz–3MHz), selectable light-load modes (Burst/Pulse-Skipping/Forced Continuous), and RSENSE or DCR current sensing per channel.
It integrates dedicated bias management via VBIAS (4.5V–40V), EXTVCC switchover (4.7V threshold), and INTVCC LDO (5.1V ±2%), enabling operation from 1V after startup when biased from boost output. The boost channel includes PassThru™ capability, IMON3 current monitor output, and OV3 overvoltage flag - all critical for automotive start-stop compliance.
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 on VBIAS; operates down to 1V after startup when biased from boost output |
| Switching Frequency | Programmable 100kHz–3MHz; phase-lockable; spread-spectrum enabled for EMI reduction |
| No-Load Quiescent Current | 14μA (14V→3.3V, Channel 1 active); 1.5μA shutdown current |
| Reference Voltages | 0.8V ±1.5% for buck channels; 1.2V ±1.5% for boost channel (VPRG3-selectable 8V/10V fixed or adjustable) |
| Operating Temperature | –40°C to +150°C junction (H-grade), AEC-Q100 qualified for automotive applications |
| Package | 40-lead 6mm × 6mm QFN with exposed GND pad (θJA = 33°C/W) |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN with exposed thermal pad (Pin 41 = GND, must be soldered to PCB). Junction temperature rating: 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MODE (1) | Light-load mode select | Ground = Burst Mode; INTVCC = Forced Continuous; 100k to INTVCC = Pulse-Skipping - controls all three channels |
| RUN1,RUN2,RUN3 (8,9,10) | Channel enable/disable inputs | Below 1.1V disables respective channel; all <0.7V shuts down entire IC with 1.5μA IQ |
| VPRG3 (16) | Boost output voltage programming | Floating = adjustable via VFB3; GND = 8V fixed; INTVCC = 10V fixed - enables cold-crank PassThru™ behavior |
| IMON3 (7) | Boost inductor current monitor | Analog voltage output (0.4–1.4V) proportional to boost channel current - used for telemetry or protection |
| OV3 (17) | Boost overvoltage indicator | Open-drain flag asserted low when VFB3 exceeds 110% of setpoint - enables system-level fault response |
| PLLIN/SPREAD (34) | Frequency sync/spread-spectrum control | Accepts external clock (0.1–3MHz) or INTVCC for spread-spectrum modulation - reduces peak EMI by >10dB |
Key Features
| Feature | Design Value |
|---|---|
| PassThru™ Boost Operation | Enables 100% duty cycle in boost channel during cold-crank (VIN < VOUT), maintaining regulated output without dropout |
| OPTI-LOOP® Compensation | Allows stable loop compensation across wide range of output capacitor ESR and capacitance values - eliminates need for custom compensation networks |
| Triple Independent RUN Pins | Per-channel enable/disable with hysteresis (100mV) - supports staggered startup, fault isolation, and dynamic power gating |
| Spread Spectrum Modulation | Reduces peak conducted/radiated EMI by spreading switching energy across 12% bandwidth - simplifies EMC certification |
| AEC-Q100 Grade H Qualification | Validated for –40°C to +150°C operation with lifetime reliability data - suitable for engine compartment and ADAS ECU deployment |
Applications
| Automotive Start-Stop Systems | ADAS Power Management |
|---|---|
Use Scenario: Maintaining stable 3.3V and 5V rails during engine cranking where battery voltage dips to 1V for 100ms. IC Role / Device Role / Timing Role: Triple-output controller providing sequenced, regulated power to microcontrollers, sensors, and interface ICs under extreme input transients. Use Value: PassThru™ boost ensures uninterrupted 10V supply to camera modules and radar SoCs when VIN drops below 10V - eliminating brownouts and system resets. | Use Scenario: Powering vision processing units, LiDAR drivers, and CAN/FlexRay transceivers in autonomous driving ECUs. IC Role / Device Role / Timing Role: Primary power controller delivering isolated, low-noise 3.3V/5V/10V rails with precise soft-start and tracking for multi-rail SoC sequencing. Use Value: Spread spectrum and OPTI-LOOP® ensure clean, stable supplies meeting CISPR-25 Class 5 EMI limits without added filtering - reducing BOM cost and board area. |
| Industrial Control Units | Avionics Power Distribution |
Use Scenario: Providing redundant 5V and 3.3V outputs for PLC I/O modules operating in wide-temperature industrial environments. IC Role / Device Role / Timing Role: High-reliability triple controller with AEC-Q100 H-grade thermal margin and robust undervoltage lockout (UVLO) hysteresis. Use Value: 150°C junction rating and 1.5μA shutdown IQ extend operational uptime in uncooled enclosures - supporting 20+ year field life requirements. | Use Scenario: Generating conditioned 28V-derived 5V/3.3V/10V rails for flight control computers and inertial measurement units. IC Role / Device Role / Timing Role: Radiation-tolerant (by design) triple controller with independent RUN pins enabling fail-safe power partitioning and graceful degradation. Use Value: Triple-channel independent enable/disable allows hot-swappable module power control and fault containment - meeting DO-160 Section 22 surge immunity requirements. |
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 + single-boost controller; same package but lower IQ (12μA), no spread spectrum, 2.2MHz max fSW | Lacks PassThru™ and cold-crank support below 3V input; not AEC-Q100 qualified | Select when EMI requirements are less stringent and automotive qualification is unnecessary |
| MPQ8645PGU-AEC1-Z | Monolithic triple-output buck controller (no boost); integrated MOSFETs; 40V input; 10A/8A/5A outputs | Cannot generate boosted output > VIN; limited to buck-only topologies; no 1V cold-crank capability | Select for space-constrained designs requiring integration, but only where boost functionality is not required |
Compared with LTC7813IUJ#TRPBF and MPQ8645PGU-AEC1-Z, the LTC7818HUJ#TRPBF uniquely combines cold-crank operation down to 1V, PassThru™ boost, spread-spectrum EMI reduction, and AEC-Q100 H-grade qualification - making it the only option for demanding automotive start-stop and ADAS power systems requiring both buck and boost regulation in a single controller.
Availability
LTC7818HUJ#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, ADAS domain controllers, industrial PLCs, and avionics power distribution modules requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for LTC7818HUJ#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC7818HUJ#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-reliability multi-rail power conversion in automotive and industrial environments where cold-crank resilience, EMI compliance, and extended temperature operation are mandatory.
FAQ
What is the minimum input voltage the LTC7818HUJ#TRPBF can regulate from during cold-crank events?
The LTC7818HUJ#TRPBF maintains regulation down to 1V input when biased from its own boost output or an auxiliary supply - a critical capability verified per ISO 16750-2 for automotive start-stop applications. This is enabled by internal bias management that shifts power sourcing from VBIAS to EXTVCC or INTVCC once startup completes, allowing operation far below the 4.5V nominal VBIAS range.
How does the PassThru™ feature work in the LTC7818HUJ#TRPBF boost channel?
The LTC7818HUJ#TRPBF's PassThru™ feature activates automatically when VIN falls below the programmed boost output voltage (e.g., 10V), forcing the boost channel into 100% duty cycle to pass input directly to output with minimal dropout. This behavior is implemented in hardware and requires no external control - ensuring seamless transition during cold-crank without software intervention or timing delays.
Can the LTC7818HUJ#TRPBF support independent power sequencing across its three outputs?
Yes - the LTC7818HUJ#TRPBF provides fully independent RUN1, RUN2, and RUN3 pins with individual 100mV hysteresis, plus TRACK/SS1, TRACK/SS2, and SS3 pins for soft-start and voltage tracking. This enables precise, staggered startup (e.g., 5V before 3.3V before 10V) and dynamic power-down of individual rails - essential for complex SoC and FPGA power domains.
What is the purpose of the IMON3 pin on the LTC7818HUJ#TRPBF?
The IMON3 pin on the LTC7818HUJ#TRPBF provides an analog voltage output (0.4V–1.4V) linearly proportional to the boost channel inductor current. It enables real-time current monitoring for telemetry, overcurrent protection, or adaptive load management - without requiring external sense resistors or amplifiers - and supports optional RC filtering for averaged readings.
Does the LTC7818HUJ#TRPBF require external compensation components for stability?
The LTC7818HUJ#TRPBF incorporates OPTI-LOOP® compensation, which dynamically adjusts loop gain based on output capacitor ESR and capacitance. While basic compensation (e.g., type-II network on ITH pins) is still required, OPTI-LOOP® significantly relaxes component tolerance constraints and eliminates the need for iterative tuning - enabling stable operation across 10× variation in output capacitance and ESR values.
LTC7818HUJ#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LTC7818HUJ#TRPBF FAQ
1.How can I place an order for LTC7818HUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7818HUJ#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 LTC7818HUJ#TRPBF reliable?
The price and inventory of LTC7818HUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7818HUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7818HUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7818HUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7818HUJ#TRPBF?
LTC7818HUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7818HUJ#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 LTC7818HUJ#TRPBF?
For technical support, including LTC7818HUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7818HUJ#TRPBF requirements.
6.How does Aetrix verify that LTC7818HUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7818HUJ#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 LTC7818HUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7818HUJ#TRPBF?
All LTC7818HUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7818HUJ#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 LTC7818HUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC7818HUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7818HUJ#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
