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Analog Devices Inc. LTC7803EUD#TRPBF
- Part No.:
- LTC7803EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803EUD#TRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:3,106
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Product details
Overview
LTC7803EUD#TRPBF from Analog Devices is a high-performance, 100% duty cycle capable, synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4.5V to 40V input, delivers up to 40V output, achieves 12µA no-load quiescent current, and supports spread spectrum operation for EMI reduction - used in automotive power supplies requiring high efficiency and low noise.
For engineers reviewing the LTC7803EUD#TRPBF datasheet, LTC7803EUD#TRPBF pinout, LTC7803EUD#TRPBF application, or LTC7803EUD#TRPBF equivalent, key selection criteria include its 3MHz programmable switching frequency, RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation, PassThru™ capability, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7803EUD#TRPBF implements a constant-frequency peak current mode architecture with phase-lockable oscillator (100kHz–3MHz), enabling precise timing control and synchronization across multi-rail systems. Its dual-mode gate drivers support both continuous conduction and burst/pulse-skipping light-load operation via the MODE pin.
It integrates an internal 5.15V INTVCC LDO powered either from VIN or external EXTVCC ≥4.7V, plus a charge pump enabling true 100% duty cycle operation during dropout. Spread spectrum dithering on PLLIN/SPREAD reduces conducted/EMI peaks without altering average frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range industrial and automotive battery inputs including 12V, 24V, and 36V nominal systems. |
| No-Load Quiescent Current | 12µA at 14VIN → 3.3VOUT - extends runtime in always-on battery-powered modules like telematics or ADAS sensors. |
| Switching Frequency | Programmable 100kHz to 3MHz - enables compact magnetics and avoids AM band interference; phase-lockable for system-level clock alignment. |
| Output Voltage Range | 0.8V to 40V - configurable via external resistor divider; supports both low-voltage logic rails and high-voltage analog subsystems. |
| Current Sensing | RSENSE or DCR - allows flexible, cost-optimized sensing with minimal board area impact and no added resistive loss in DCR mode. |
| Spread Spectrum | Enabled via PLLIN/SPREAD = INTVCC - reduces peak EMI by ±10% frequency dithering, easing compliance with CISPR 25 Class 5. |
| Shutdown Current | 1.2µA - ensures ultra-low leakage during vehicle sleep modes, critical for meeting ISO 16750-2 quiescent current limits. |
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 Gate Driver Output | Floating high-side driver output referenced to SW node; drives N-channel MOSFET gate with INTVCC swing above SW. |
| SW (Pin 2) | Switch Node | Connection point between TG and BG outputs and external inductor; carries high di/dt switching waveform. |
| 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 | High-impedance input to differential current comparator; used with SENSE– to set ITH-dependent current limit threshold. |
| INTVCC (Pin 12) | Internal LDO Output | 5.15V regulated supply powering gate drivers and control circuitry; requires ≥4.7µF ceramic decoupling to GND. |
| MODE (Pin 11) | Light-Load Operation Select | Configures Burst Mode (GND), pulse-skipping (100kΩ to INTVCC), or forced continuous (INTVCC) - directly impacts light-load efficiency. |
| GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; must be soldered to PCB ground plane for thermal performance and low-noise reference integrity. |
Key Features
| Feature | Design Value |
|---|---|
| PassThru™ / 100% Duty Cycle | Enables seamless transition into dropout; maintains regulation down to VIN – VOUT ≈ 0V using integrated charge pump - essential for cold-crank automotive operation. |
| OPTI-LOOP Compensation | Allows stable loop response across wide range of output capacitor ESR and capacitance values (e.g., ceramic + polymer combinations), reducing design iteration time. |
| AEC-Q100 Qualified | Rated for automotive temperature range (–40°C to +125°C junction); qualified per stress test requirements for Grade 1 - suitable for engine bay and infotainment power rails. |
| Low-Ripple Burst Mode | Delivers <10mVPP output ripple at light loads while maintaining >85% efficiency at 1mA - ideal for noise-sensitive RF and sensor bias supplies. |
| Phase-Lockable Frequency | Synchronizes switching edge to external clock (0.1–3MHz) via PLLIN/SPREAD pin - eliminates beat frequencies in multi-converter systems like ADAS domain controllers. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
|
Use Scenario: Powering 3.3V/5V logic and audio codecs in head units with 12V/24V battery input and strict CISPR 25 EMI limits. IC Role / Device Role: Primary synchronous buck controller managing high-current, low-noise DC/DC conversion with spread spectrum enabled. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep; spread spectrum meets Class 5 conducted emissions without added filtering. |
Use Scenario: Generating isolated 5V/12V rails for digital I/O and analog sensor interfaces in DIN-rail mounted PLCs operating from 24V DC bus. IC Role / Device Role: High-efficiency, wide-input controller supporting 40V transients and delivering stable output under variable load conditions. Use Value: 4.5V–40V input range withstands 40V surge events; RSENSE/DCR flexibility allows optimal trade-off between accuracy and power loss in space-constrained designs. |
| Military Vehicle DC-DC Conversion | Telecom Remote Radio Unit (RRU) |
|
Use Scenario: Converting 28V aircraft bus to 5V/3.3V for mission-critical avionics processors and FPGAs in vibration-prone environments. IC Role / Device Role: Robust, thermally efficient controller with AEC-Q100 qualification and 125°C junction rating for extended reliability. Use Value: Exposed-pad QFN package ensures thermal stability under sustained 2A–5A loads; 100% duty cycle supports brownout operation during engine start. |
Use Scenario: Providing 12V bias for GaN PA stages and 3.3V for FPGA control in outdoor 5G RRUs powered from 48V telecom rectifiers. IC Role / Device Role: High-frequency (2.25MHz) synchronous controller minimizing inductor size while maintaining >92% efficiency at full load. Use Value: 3MHz capability enables <10mm² inductor footprint; EXTVCC option allows efficient use of existing 12V rail to reduce total system power loss. |
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; 2.5µA shutdown IQ; supports only RSENSE sensing. | Lacks phase-lock and EMI-reduction features; limited to non-automotive industrial use due to no AEC-Q100 rating. | Choose when cost sensitivity outweighs EMI and automotive qualification requirements. |
| TPS53679RSBT | Integrated MOSFETs (30A); fixed 500kHz/750kHz options; no 100% duty cycle; 15µA no-load IQ. | Not a controller-only solution - unsuitable where discrete high-current FETs or PassThru™ are required. | Prefer for compact, lower-component-count designs where integrated power stage suffices and dropout operation is not needed. |
Compared with MP2918GQ-Z and TPS53679RSBT, the LTC7803EUD#TRPBF uniquely combines AEC-Q100 qualification, programmable 100kHz–3MHz frequency with spread spectrum, and true 100% duty cycle - making it the only viable choice for automotive and high-reliability industrial buck controllers demanding EMI compliance and cold-crank robustness.
Availability
LTC7803EUD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power supplies, military vehicle electronics, and telecom remote radio units requiring stable component supply and long-term lifecycle assurance.
Supply support for LTC7803EUD#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, 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, designed specifically for high-efficiency, low-noise, wide-input synchronous buck conversion in automotive, industrial, and aerospace applications where reliability and EMI performance are critical.
FAQ
What is the maximum supported switching frequency for LTC7803EUD#TRPBF?
The LTC7803EUD#TRPBF supports a programmable switching frequency from 100kHz to 3MHz. When the FREQ pin is tied to INTVCC, it operates at a fixed high frequency of 2.25MHz; with RFREQ = 12.5kΩ to GND, it achieves 3MHz. This high-frequency capability enables compact magnetic design and avoids sensitive frequency bands in automotive and telecom applications.
Does LTC7803EUD#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803EUD#TRPBF supports true 100% duty cycle operation via its integrated charge pump, which sustains gate drive for the top N-channel MOSFET even when VIN approaches VOUT. This PassThru™ feature is critical for automotive cold-crank scenarios where input voltage may dip below regulated output, ensuring uninterrupted power delivery without dropout-induced reset.
How does spread spectrum operation reduce EMI in LTC7803EUD#TRPBF?
The LTC7803EUD#TRPBF implements spread spectrum by dithering its oscillator frequency ±10% around the programmed center frequency when PLLIN/SPREAD is tied to INTVCC. This spreads energy across a wider bandwidth, reducing peak conducted and radiated emissions - directly easing compliance with stringent automotive EMI standards like CISPR 25 Class 5 without additional shielding or filtering components.
What are the light-load operation modes supported by LTC7803EUD#TRPBF, and how are they selected?
The LTC7803EUD#TRPBF supports three light-load modes: Burst Mode (MODE = GND), pulse-skipping (MODE = INTVCC via 100kΩ), and forced continuous conduction (MODE = INTVCC). Each mode balances efficiency vs. output ripple - Burst Mode achieves <12µA input current but introduces low-frequency ripple; forced continuous eliminates ripple at the cost of higher quiescent loss.
Is LTC7803EUD#TRPBF qualified for automotive applications, and what grade does it meet?
Yes, the LTC7803EUD#TRPBF is AEC-Q100 qualified for automotive applications and specified for the E-grade temperature range (–40°C to +125°C junction). Its QFN package, robust EMI performance, ultra-low shutdown current (1.2µA), and 100% duty cycle capability make it suitable for engine control units, ADAS cameras, and infotainment systems deployed in harsh automotive environments.
LTC7803EUD#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)
LTC7803EUD#TRPBF FAQ
1.How can I place an order for LTC7803EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803EUD#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 LTC7803EUD#TRPBF reliable?
The price and inventory of LTC7803EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803EUD#TRPBF?
LTC7803EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803EUD#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 LTC7803EUD#TRPBF?
For technical support, including LTC7803EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803EUD#TRPBF requirements.
6.How does Aetrix verify that LTC7803EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803EUD#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 LTC7803EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803EUD#TRPBF?
All LTC7803EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803EUD#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 LTC7803EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7803EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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