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Analog Devices Inc. LTC7803IUD#TRPBF
- Part No.:
- LTC7803IUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803IUD#TRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:3,868
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Product details
Overview
LTC7803IUD#TRPBF 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 3MHz programmable switching frequency, spread spectrum EMI reduction, and 12µA no-load quiescent current - ideal for automotive infotainment power supplies requiring low IQ and wide VIN range.
For engineers reviewing the LTC7803IUD#TRPBF datasheet, LTC7803IUD#TRPBF pinout, LTC7803IUD#TRPBF application, or LTC7803IUD#TRPBF equivalent, key selection criteria include its RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation for broad capacitor/ESR compatibility, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7803IUD#TRPBF implements a constant-frequency peak current mode architecture with phase-lockable oscillator (100kHz–3MHz) and integrated spread spectrum dithering to suppress conducted/EMI noise peaks. Its dual LDO system (VIN- and EXTVCC-powered INTVCC) enables flexible bias sourcing and reduces input-referred IQ at light loads.
It supports 100% duty cycle operation via internal charge pump for dropout conditions, uses differential SENSE+/SENSE– inputs for accurate current sensing, and provides three distinct light-load operating modes selected via the MODE pin - each with defined efficiency vs. ripple trade-offs verified across –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports 12V/24V/36V automotive and industrial bus rails without external pre-regulation. |
| No-Load Quiescent Current | 12µA at 14VIN→3.3VOUT - extends battery runtime in always-on vehicle modules. |
| Switching Frequency | Programmable 100kHz–3MHz (via FREQ pin resistor) - enables optimization of size (high f) vs. efficiency (low f). |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.2% over temp) - sets precise output regulation with standard resistor dividers. |
| Current Sense Threshold | 50mV typical (45–55mV) - allows accurate current limiting with low-value, low-power sense resistors. |
| Shutdown Current | 1.2µA - ensures ultra-low leakage during system sleep states. |
| Operating Junction Temp | –40°C to +125°C - qualified per AEC-Q100 Grade I for under-hood automotive use. |
Pinout & Package
Package: 16-pin (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Thermally enhanced for high-power density applications; requires soldered exposed pad for rated θJA = 68°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top N-MOSFET gate driver output | Floating high-side driver with INTVCC-referenced swing - enables 100% duty cycle via internal charge pump. |
| SW (Pin 2) | Switch node connection | Drives external inductor; ties BOOST capacitor and bottom MOSFET source - critical for layout EMI control. |
| TRACK/SS (Pin 3) | Soft-start and tracking input | Internal 12.5µA pull-up charges external capacitor for controlled VOUT ramp; also enables supply tracking. |
| SENSE+ (Pin 4) | Positive current sense input | Differential input to current comparator - used with SENSE– to set peak current limit independent of VOUT. |
| INTVCC (Pin 12) | Internal 5.15V LDO output | Powers gate drivers and analog circuitry; must be decoupled with ≥4.7µF ceramic capacitor to GND. |
| MODE (Pin 11) | Light-load operation mode select | GND = Burst Mode (lowest IQ); INTVCC = Continuous; INTVCC via 100kΩ = Pulse-Skipping (low ripple). |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak EMI by ±20% frequency dithering - simplifies compliance with CISPR 25 Class 5 in automotive systems. |
| OPTI-LOOP Compensation | Enables stable loop response across wide range of output capacitors (10µF–1000µF) and ESR (0.5mΩ–100mΩ). |
| PassThru™ / 100% Duty Cycle | Internal charge pump sustains top MOSFET conduction during VIN-to-VOUT dropout - eliminates need for external linear post-regulator. |
| RSENSE or DCR Sensing | Flexible current sensing using discrete shunt or inductor DCR - reduces BOM cost and board space vs. dedicated sense resistors. |
| AEC-Q100 Qualified | Grade I (–40°C to +125°C) qualification confirmed - meets automotive reliability and stress test requirements. |
Applications
| Automotive Infotainment Power | Industrial 24V DC-DC Conversion |
|---|---|
|
Use Scenario: Powering 3.3V/5V logic rails in head units, ADAS cameras, and telematics modules from 12V/24V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary step-down controller managing high-current buck stage with spread spectrum EMI suppression and AEC-Q100 reliability. Use Value: 12µA IQ extends battery life during vehicle sleep; 40V max input handles load dump transients; 100% duty cycle maintains output during cranking. |
Use Scenario: Generating isolated or non-isolated 5V/12V rails for PLC I/O modules, motor drives, and factory HMIs powered from 24V industrial bus. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller with programmable frequency and robust current sensing for variable load profiles. Use Value: RSENSE/DCR flexibility lowers BOM cost; OPTI-LOOP ensures stability with diverse output caps; wide VIN accommodates brownout conditions. |
| Military Vehicle Power Systems | Telecom Remote Radio Units |
|
Use Scenario: Providing regulated 3.3V/12V supplies in ruggedized communication equipment operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Radiation-tolerant (by design), high-temp-rated controller enabling compact, efficient power conversion in SWaP-constrained platforms. Use Value: 125°C junction rating ensures operation in sealed enclosures; low shutdown IQ (1.2µA) preserves backup battery life; spread spectrum eases TEMPEST compliance. |
Use Scenario: Converting 48V telecom rectifier output to 3.3V/5V for FPGA, DSP, and RF front-end ICs in outdoor base station RRUs. IC Role / Device Role / Timing Role: High-frequency (up to 3MHz) buck controller minimizing inductor size while maintaining >90% efficiency at partial load. Use Value: Programmable frequency avoids sensitive RF bands; pulse-skipping mode reduces output ripple vs. Burst Mode; EXTVCC option improves overall system efficiency. |
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; 5.5V–36V input; 2.5µA IQ; no PLL sync or 100% duty cycle. | Suitable for cost-sensitive industrial SMPS where EMI filtering is handled externally and dropout operation is not required. | Choose MP2918GQ-Z when fixed frequency, lower cost, and simpler layout outweigh need for EMI reduction and 100% duty cycle. |
| TPS53679RSBT | 4.5V–16V input; 3-phase capable; integrated MOSFET drivers; 1.2mA typical operating current; no spread spectrum. | Targeted at high-current CPU/GPU VRMs in servers and networking gear - not suitable for 40V automotive or industrial inputs. | Choose TPS53679RSBT only for multi-phase, low-input-voltage, high-current digital power delivery - not a functional substitute for LTC7803IUD#TRPBF's wide-VIN capability. |
Compared with MP2918GQ-Z and TPS53679RSBT, the LTC7803IUD#TRPBF uniquely combines 40V input tolerance, 12µA IQ, spread spectrum, and 100% duty cycle - making it the only viable option for automotive and high-reliability industrial buck controllers demanding both ultra-low standby power and dropout resilience.
Availability
LTC7803IUD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V DC-DC conversion, and military vehicle power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7803IUD#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 LTC7803 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-noise, wide-input-voltage synchronous buck regulation in mission-critical automotive and industrial applications.
FAQ
What is the maximum input voltage rating for the LTC7803IUD#TRPBF?
The LTC7803IUD#TRPBF has an absolute maximum input voltage (VIN) rating of 40V, with guaranteed operation across 4.5V to 40V. This makes it suitable for 24V and 36V industrial systems and automotive applications subject to load dump transients. Exceeding 40V risks permanent damage per Absolute Maximum Ratings.
Does the LTC7803IUD#TRPBF support spread spectrum operation, and how is it enabled?
Yes, the LTC7803IUD#TRPBF supports spread spectrum to reduce EMI peaks. It is enabled by connecting the PLLIN/SPREAD pin to INTVCC. When grounded, spread spectrum is disabled; when driven by an external clock, the device synchronizes but disables spread spectrum and enters pulse-skipping or forced continuous mode depending on the MODE pin state.
What package type and thermal characteristics does the LTC7803IUD#TRPBF use?
The LTC7803IUD#TRPBF uses a 16-pin 3mm × 3mm plastic QFN (UD package) with exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 68°C/W and θJC = 4.2°C/W. The exposed pad must be soldered to PCB copper for rated performance - insufficient thermal relief will cause premature thermal shutdown above 125°C junction temperature.
How does the MODE pin configure light-load behavior in the LTC7803IUD#TRPBF?
The MODE pin selects light-load operation: GND enables Burst Mode (lowest IQ, higher ripple); INTVCC enables forced continuous conduction (lowest ripple, higher IQ); and INTVCC through a 100kΩ resistor enables pulse-skipping (moderate ripple/IQ balance). An internal 100kΩ pull-down defaults to Burst Mode if the pin floats.
Is the LTC7803IUD#TRPBF qualified for automotive applications, and what grade does it meet?
Yes, the LTC7803IUD#TRPBF is AEC-Q100 qualified for automotive use. It meets Grade I specifications with guaranteed operation from –40°C to +125°C junction temperature. It is not an automotive-specific part number (e.g., no #WPBF suffix), but its I-grade temperature range and qualification data confirm suitability for under-hood and cabin applications meeting AEC-Q100 requirements.
LTC7803IUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC7803IUD#TRPBF FAQ
1.How can I place an order for LTC7803IUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803IUD#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 LTC7803IUD#TRPBF reliable?
The price and inventory of LTC7803IUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803IUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803IUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803IUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803IUD#TRPBF?
LTC7803IUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803IUD#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 LTC7803IUD#TRPBF?
For technical support, including LTC7803IUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803IUD#TRPBF requirements.
6.How does Aetrix verify that LTC7803IUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803IUD#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 LTC7803IUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803IUD#TRPBF?
All LTC7803IUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803IUD#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 LTC7803IUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7803IUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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