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Analog Devices Inc. LTC7803JUD#PBF
- Part No.:
- LTC7803JUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803JUD#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:1,004
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Product details
Overview
LTC7803JUD#PBF 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 programmable 100kHz–3MHz switching frequency - enabling compact, efficient power supplies in automotive infotainment and industrial motor control systems.
For engineers reviewing the LTC7803JUD#PBF datasheet, LTC7803JUD#PBF pinout, LTC7803JUD#PBF application, or LTC7803JUD#PBF equivalent, key selection considerations include its AEC-Q100 qualification for automotive use, 150°C junction-rated QFN package, RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation, and selectable light-load modes (Burst, pulse-skipping, or forced continuous).
Technical Context
The LTC7803JUD#PBF implements a constant-frequency peak current mode architecture with phase-lockable oscillator (100kHz–3MHz), supporting synchronization to external clocks via PLLIN/SPREAD. Its dual LDO structure (VIN- and EXTVCC-powered INTVCC) enables flexible biasing and reduces input-referred quiescent current under light loads.
It integrates PassThru™ operation for 100% duty cycle dropout mode, spread spectrum dithering (0–20% frequency modulation) to suppress conducted/radiated EMI peaks, and a transconductance error amplifier (gm = 2 mmho) with 0.792–0.808V feedback reference tolerance over –40°C to 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range battery and industrial bus inputs without pre-regulation. |
| No-Load Quiescent Current | 12µA at 14VIN/3.3VOUT - extends runtime in always-on automotive modules and IoT edge nodes. |
| Switching Frequency Range | 100kHz to 3MHz (programmable via FREQ pin resistor) - enables optimization of size (high-freq) vs. efficiency (low-freq). |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.0% over –40°C to 150°C) - ensures tight output regulation across automotive temperature extremes. |
| Max Duty Cycle | 100% - maintains regulation during input voltage sag (e.g., cold-crank 4.5V) without dropout. |
| Current Sense Threshold | 45mV to 55mV - compatible with low-value RSENSE (e.g., 1mΩ) for minimal conduction loss and thermal footprint. |
| Shutdown Current | 1.2µA - meets ultra-low-power requirements for wake-on-event architectures. |
Pinout & Package
Package: 16-pin (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Rated for –40°C to +150°C junction temperature and AEC-Q100 Grade 1 qualification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top Gate Driver Output | Floating high-side N-MOSFET driver with INTVCC-referenced swing - requires BOOST capacitor for bootstrap operation. |
| SW (Pin 2) | Switch Node | Connection point between TG, BG, and external inductor - critical for layout EMI control and gate drive loop integrity. |
| TRACK/SS (Pin 3) | Soft-Start & Tracking Input | Internal 12.5µA pull-up charges external capacitor for controlled VOUT ramp; also enables supply tracking during startup. |
| SENSE+ (Pin 4) | Current Sense Positive Input | Differential input to current comparator - used with SENSE– to set ITH-dependent current limit threshold. |
| INTVCC (Pin 12) | Internal 5.15V LDO Output | Powers gate drivers and control circuitry; must be decoupled with ≥4.7µF ceramic capacitor to GND for stability. |
| MODE (Pin 11) | Light-Load Operation Mode Select | GND = Burst Mode, INTVCC = forced continuous, INTVCC via 100kΩ = pulse-skipping - directly configures efficiency vs. ripple trade-off. |
| PLLIN/SPREAD (Pin 10) | Synchronization & Spread Spectrum Control | INTVCC = enable spread spectrum; external clock = phase-lock mode - reduces EMI peak amplitude without filtering overhead. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak radiated/conducted EMI by up to 10dB without adding external filters or shielding - simplifies EMC certification. |
| OPTI-LOOP Compensation | Enables stable loop response across wide range of output capacitor types (ceramic, polymer, electrolytic) and ESR values - eliminates iterative compensation tuning. |
| PassThru™ 100% Duty Cycle | Maintains regulation down to VIN = VOUT + dropout losses - essential for automotive cold-crank (4.5V) and industrial brownout conditions. |
| RSENSE or DCR Sensing | Supports either discrete sense resistors or inductor DCR for current sensing - lowers BOM cost and improves thermal efficiency vs. shunt-only solutions. |
| AEC-Q100 Qualified | Rated for –40°C to +150°C operation with full automotive reliability testing - qualified for engine control units, ADAS cameras, and infotainment head units. |
Applications
| Automotive Infotainment Power | Industrial Motor Drive Bias Supply |
|---|---|
|
Use Scenario: Powering FPGA, DSP, and display controllers in vehicle head units with 12V/24V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 3.3V/5V/12V rails with spread spectrum to meet CISPR 25 Class 5 emissions. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep; 150°C rating ensures reliability near hot engine compartments. |
Use Scenario: Generating isolated gate driver bias rails (e.g., ±15V) from 24V/48V industrial bus in servo drives and PLC I/O modules. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck controller feeding downstream isolated DC/DC converters or linear regulators. Use Value: 40V max input handles 48V transients; programmable frequency avoids noise coupling into sensitive analog signal chains. |
| Avionics Remote I/O Power | Telecom Base Station Management |
|
Use Scenario: Providing regulated 3.3V/5V for remote sensor interfaces and CAN transceivers in airborne data acquisition systems. IC Role / Device Role / Timing Role: Radiation-tolerant (by design), high-reliability buck controller with 100% duty cycle for emergency hold-up during input dips. Use Value: AEC-Q100 qualification correlates with DO-160 environmental robustness; low shutdown IQ (1.2µA) preserves backup battery life. |
Use Scenario: Powering microcontrollers, EEPROMs, and monitoring ICs in 48V telecom rectifier shelves requiring long-term field reliability. IC Role / Device Role / Timing Role: Primary system management rail controller with precise 0.8V feedback reference and thermal derating support. Use Value: 0.792–0.808V VFB tolerance ensures <±1% output accuracy over full temp range; EXTVCC option enables high-efficiency auxiliary bias sourcing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | Lower max input (30V), no spread spectrum, fixed 600kHz/1.2MHz options only, no AEC-Q100 grade available. | Targeted at cost-sensitive consumer/industrial SMPS; lacks automotive qualification and EMI mitigation features. | Select when budget constraints outweigh EMI compliance needs and input voltage stays ≤30V. |
| LM5143AQDNTQ1 | Wider input (4.5–60V), integrated high-side FET, no 100% duty cycle, higher IQ (25µA), no spread spectrum. | Designed for simpler, lower-component-count designs where integration offsets loss of 100% duty cycle and EMI control. | Select when board space is critical and input never drops below ~6V; verify dropout behavior against cold-crank specs. |
Compared with MP2918GQ-Z and LM5143AQDNTQ1, the LTC7803JUD#PBF uniquely combines AEC-Q100 qualification, spread spectrum EMI reduction, true 100% duty cycle, and sub-15µA quiescent current - making it the only choice for demanding automotive and avionics power rails requiring both reliability and regulatory compliance.
Availability
LTC7803JUD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial motor control, avionics remote I/O, and telecom base station management requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC7803JUD#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, Inc. 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, engineered specifically for high-efficiency, low-EMI, wide-input synchronous buck conversion in safety-critical and thermally constrained environments.
FAQ
What is the maximum operating junction temperature for the LTC7803JUD#PBF?
The LTC7803JUD#PBF is rated for –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. This specification is confirmed in the Absolute Maximum Ratings table and Order Information section of the Rev. B datasheet, where "J" grade denotes the 150°C max TJ rating.
Does the LTC7803JUD#PBF support both RSENSE and DCR current sensing?
Yes, the LTC7803JUD#PBF supports both RSENSE and DCR current sensing methods, as explicitly stated in the FEATURES section and detailed in the Applications Information. The SENSE+ and SENSE– pins form a differential input to the current comparator, allowing direct connection to either a discrete sense resistor or the DCR of an inductor with appropriate RC network filtering.
How does spread spectrum operation reduce EMI in the LTC7803JUD#PBF?
The LTC7803JUD#PBF reduces peak conducted and radiated EMI by modulating its switching frequency ±10% around the nominal value (0–20% total spread) when PLLIN/SPREAD is tied to INTVCC. This dithering spreads energy across a wider bandwidth, lowering spectral peaks - a technique validated in typical performance curves (Figure G25) and cited in the DESCRIPTION section for easier EMI compliance.
What package type and thermal characteristics apply to the LTC7803JUD#PBF?
The LTC7803JUD#PBF uses a 16-lead (3mm × 3mm) plastic QFN package with exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 68°C/W and θJC = 4.2°C/W, per the UD PACKAGE drawing on page 2 of the datasheet. The exposed pad must be soldered to PCB copper for rated thermal performance.
Can the LTC7803JUD#PBF operate with 100% duty cycle, and under what conditions?
Yes, the LTC7803JUD#PBF supports true 100% duty cycle operation (PassThru™ mode) when the FREQ pin is grounded, enabling regulation even when VIN approaches VOUT. This behavior is confirmed in the FEATURES list ("PassThru™/100% Duty Cycle Capable") and the Electrical Characteristics table (MAX DUTY FACTOR FOR TG = 100%).
LTC7803JUD#PBF 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#PBF FAQ
1.How can I place an order for LTC7803JUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803JUD#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 LTC7803JUD#PBF reliable?
The price and inventory of LTC7803JUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803JUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7803JUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803JUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803JUD#PBF?
LTC7803JUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803JUD#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 LTC7803JUD#PBF?
For technical support, including LTC7803JUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803JUD#PBF requirements.
6.How does Aetrix verify that LTC7803JUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7803JUD#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 LTC7803JUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7803JUD#PBF?
All LTC7803JUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803JUD#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 LTC7803JUD#PBF part is unused and in its original packaging.
Return procedure for LTC7803JUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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