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Analog Devices Inc. LTC7803JUD#WPBF
- Part No.:
- LTC7803JUD#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803JUD#WPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
LTC7803JUD#WPBF from Analog Devices is a high-performance, 100% duty cycle capable, synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. It operates from 4.5V to 40V input, delivers up to 40V output, and features 12µA no-load quiescent current, spread spectrum EMI reduction, and AEC-Q100 qualification for automotive systems requiring robust power conversion in engine control units and ADAS domain controllers.
For engineers reviewing the LTC7803JUD#WPBF datasheet, LTC7803JUD#WPBF pinout, LTC7803JUD#WPBF application, or LTC7803JUD#WPBF equivalent, key selection criteria include its 3MHz programmable switching frequency, RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation for wide output capacitor/ESR ranges, and thermally enhanced 3mm × 3mm QFN package with exposed GND pad.
Technical Context
The LTC7803JUD#WPBF implements a constant-frequency peak current mode architecture with phase-lockable oscillator (100kHz–3MHz) and integrated spread spectrum dithering to suppress conducted and radiated EMI peaks. Its dual-mode gate drivers support 100% duty cycle operation via internal charge pump during dropout conditions.
It features three selectable light-load modes-Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction-controlled by the MODE pin, and supports external synchronization via PLLIN/SPREAD pin while maintaining compatibility with OPTI-LOOP compensation across 0.8V–40V output range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - enables direct battery-fed operation in 12V/24V/36V automotive and industrial systems without pre-regulation. |
| No-Load Quiescent Current | 12µA at 14VIN → 3.3VOUT - extends runtime in always-on vehicle modules such as telematics and body control units. |
| Switching Frequency | Programmable 100kHz–3MHz or phase-lockable 0.1–3MHz - allows optimization of size vs. efficiency and EMI compliance in space-constrained designs. |
| Output Voltage Range | 0.8V to 40V - supports wide-range regulation including high-side buck configurations for auxiliary rails and sensor supplies. |
| Current Sensing | RSENSE or DCR - provides design flexibility for precision current limiting or cost-optimized inductor-based sensing in high-current applications. |
| Junction Temperature Range | –40°C to +150°C - qualified per AEC-Q100 Grade 1, enabling use in under-hood automotive environments and industrial motor drives. |
| Package | 16-pin 3mm × 3mm QFN with exposed GND pad - delivers θJC = 4.2°C/W for reliable thermal management in high-power density layouts. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND), rated for –40°C to +150°C operating junction temperature and optimized for low θJA (68°C/W) and ultra-low θJC (4.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top N-MOSFET gate driver output | Floating driver with INTVCC-referenced swing; enables 100% duty cycle via internal charge pump during VIN-to-VOUT dropout. |
| SW (Pin 2) | Switch node connection | Direct interface to external inductor; must be routed with minimal loop area to reduce EMI and voltage spikes. |
| TRACK/SS (Pin 3) | Soft-start and tracking input | Internal 12.5µA pull-up charges external capacitor for controlled VOUT ramp; supports supply tracking in multi-rail systems. |
| SENSE+ (Pin 4) | Positive current sense input | Differential input to current comparator; used with SENSE– to set precise overcurrent threshold via RSENSE or DCR. |
| INTVCC (Pin 12) | Internal 5.15V LDO output | Primary power rail for gate drivers and analog circuitry; requires ≥4.7µF ceramic decoupling to GND for stability. |
| MODE (Pin 11) | Light-load operation mode select | GND = Burst Mode (ultra-low IQ), INTVCC = forced CCM, INTVCC via 100kΩ = pulse-skipping - enables dynamic efficiency tuning. |
| PLLIN/SPREAD (Pin 10) | Synchronization and spread spectrum control | INTVCC = enable spread spectrum; external clock = phase-lock mode; critical for deterministic EMI suppression in synchronized multi-phase systems. |
Key Features
| Feature | Design Value |
|---|---|
| Spread spectrum modulation | Reduces peak EMI by >10dB across input/output lines, easing CISPR 25 Class 5 compliance without added filtering components. |
| OPTI-LOOP compensation | Allows stable loop response across wide variations in output capacitance (10µF–1000µF) and ESR (0.5mΩ–100mΩ), eliminating iterative compensation redesign. |
| PassThru™ 100% duty cycle | Enables seamless transition into dropout without output collapse - essential for cold-crank automotive scenarios where VIN drops to 3.5V. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation with HTOL, TC, and ESD testing - meets functional safety requirements for ASIL-B automotive subsystems. |
| Low shutdown IQ (1.2µA) | Minimizes battery drain during vehicle sleep mode; supports >10-year shelf life in always-connected telematics modules. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
|
Use Scenario: Regulating 5V/3.3V rails from 12V/24V battery in engine control module under cold-crank (VIN = 3.5V) and load-dump (VIN = 40V) transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current gate drivers and isolated CAN/FlexRay interfaces. Use Value: PassThru™ operation maintains regulated output during cold-crank; spread spectrum reduces radiated emissions near sensitive ignition timing circuits. |
Use Scenario: Generating isolated gate drive supplies for IGBTs/MOSFETs in servo amplifier power stages with variable bus voltage (20–400V DC link). IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down intermediate 15V rail to 12V/5V gate driver supplies with tight transient response. Use Value: 3MHz switching enables compact magnetics; OPTI-LOOP ensures stability despite wide output capacitor tolerance in harsh vibration environments. |
| Avionics Flight Management System | Telecom Base Station Remote Radio Unit |
|
Use Scenario: Powering FPGA, ADCs, and RF front-end ICs in DO-160G-compliant airborne computing modules with strict EMI limits. IC Role / Device Role / Timing Role: EMI-optimized primary converter feeding downstream point-of-load regulators in multi-voltage domain architecture. Use Value: Spread spectrum + phase-lock capability enables deterministic noise shaping to avoid interference with GPS L1/L2 bands and VHF comms. |
Use Scenario: Converting 48V telecom rectifier output to 12V/5V rails for FPGAs, DSPs, and RF transceivers in outdoor macrocell RRUs exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-reliability, high-temperature buck controller supporting extended lifetime under continuous 60°C ambient operation. Use Value: 150°C junction rating and AEC-Q100 process ensure >10-year field reliability; low IQ minimizes thermal loading in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | Fixed 600kHz frequency, no spread spectrum, lower max input (30V), no AEC-Q100 qualification | Suitable for cost-sensitive industrial SMPS but lacks EMI mitigation and automotive temp grade | Select when EMI requirements are relaxed and VIN ≤30V; not recommended for automotive or avionics. |
| LM5145QPWPRQ1 | Supports higher VIN (65V), includes integrated high-side gate driver bootstrap diode, no OPTI-LOOP | Better suited for 48V industrial systems and HEV/EV battery monitoring; less flexible compensation | Choose for >40V input or simplified layout with integrated bootstrap diode; requires manual loop compensation. |
Compared with MP2918GQ-Z and LM5145QPWPRQ1, the LTC7803JUD#WPBF uniquely combines AEC-Q100 Grade 1 qualification, programmable spread spectrum, OPTI-LOOP, and 100% duty cycle in a 3mm × 3mm QFN - making it optimal for automotive and high-reliability embedded power where EMI, thermal, and transient performance are co-constrained.
Availability
LTC7803JUD#WPBF is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, avionics computing modules, and telecom remote radio units requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LTC7803JUD#WPBF 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 aerospace markets with precision power, signal chain, and RF solutions.
The LTC7803JUD#WPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI, high-reliability DC/DC conversion in demanding automotive and industrial environments.
FAQ
What is the maximum operating junction temperature for the LTC7803JUD#WPBF?
The LTC7803JUD#WPBF is specified for –40°C to +150°C operating junction temperature and qualified per AEC-Q100 Grade 1. This rating enables deployment in under-hood automotive locations and high-ambient industrial settings where thermal derating must be minimized. The device's 3mm × 3mm QFN package with exposed GND pad achieves θJC = 4.2°C/W to sustain full performance at elevated temperatures.
How does the LTC7803JUD#WPBF achieve EMI reduction without external filters?
The LTC7803JUD#WPBF integrates spread spectrum frequency modulation (±10% dither around fOSC) and phase-lockable operation, reducing peak conducted and radiated emissions by >10dB. When PLLIN/SPREAD is tied to INTVCC, the oscillator dithers continuously; when synchronized to an external clock, noise energy spreads deterministically - both methods eliminate need for bulky ferrite beads or Y-capacitors in CISPR 25-compliant automotive designs.
Can the LTC7803JUD#WPBF operate with 100% duty cycle, and how is it implemented?
Yes, the LTC7803JUD#WPBF supports true 100% duty cycle via its PassThru™ architecture. When VIN approaches VOUT, the internal charge pump sustains BOOST voltage to drive the top N-MOSFET continuously, preventing output collapse during cold-crank events (e.g., VIN dropping to 3.5V while regulating 3.3V). This is confirmed in the Absolute Maximum Ratings and Functional Diagram sections of the official datasheet.
What are the light-load efficiency modes supported by the LTC7803JUD#WPBF?
The LTC7803JUD#WPBF offers three selectable light-load modes via the MODE pin: Burst Mode (12µA IQ, ideal for always-on automotive modules), pulse-skipping (balanced efficiency/noise), and forced continuous conduction (lowest output ripple). Each mode is hardware-selectable with no firmware dependency, and Burst Mode is enabled by default when MODE is floating due to internal 100kΩ pull-down.
Is the LTC7803JUD#WPBF pin-compatible with other members of the LTC7803 family?
Yes, the LTC7803JUD#WPBF shares identical 16-pin QFN pinout and electrical characteristics with all LTC7803 variants (e.g., LTC7803EUD#PBF, LTC7803IUD#PBF), differing only in temperature grade and automotive qualification. The J-grade (–40°C to +150°C) and #WPBF suffix denote AEC-Q100 qualification, while pin functions, timing, and compensation behavior remain fully consistent across the family.
LTC7803JUD#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- 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:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC7803JUD#WPBF FAQ
1.How can I place an order for LTC7803JUD#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803JUD#WPBF 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 LTC7803JUD#WPBF reliable?
The price and inventory of LTC7803JUD#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803JUD#WPBF is usually 5 days.
3.What payment methods are accepted for LTC7803JUD#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803JUD#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803JUD#WPBF?
LTC7803JUD#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803JUD#WPBF 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 LTC7803JUD#WPBF?
For technical support, including LTC7803JUD#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803JUD#WPBF requirements.
6.How does Aetrix verify that LTC7803JUD#WPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803JUD#WPBF 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 LTC7803JUD#WPBF meets industry standards.
7.What is the process for return or replacement of LTC7803JUD#WPBF?
All LTC7803JUD#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803JUD#WPBF, 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 LTC7803JUD#WPBF part is unused and in its original packaging.
Return procedure for LTC7803JUD#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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