My Inquiry
My Account
Analog Devices Inc. LTC7803JUD#WTRPBF
- Part No.:
- LTC7803JUD#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803JUD#WTRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:2,212
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7803JUD#WTRPBF 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, features 12µA no-load quiescent current, 3MHz programmable switching frequency, and spread spectrum EMI reduction-designed for automotive power conversion in engine control units and ADAS domain controllers.
For engineers reviewing the LTC7803JUD#WTRPBF datasheet, LTC7803JUD#WTRPBF pinout, LTC7803JUD#WTRPBF application, or LTC7803JUD#WTRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 150°C junction rating, RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation, and selectable light-load modes (Burst/Pulse-Skipping/Continuous) for battery-sensitive systems.
Technical Context
The LTC7803JUD#WTRPBF implements a constant-frequency peak current mode architecture with phase-lockable oscillator (100kHz–3MHz), enabling precise timing synchronization across multi-rail power systems. Its dual-mode gate drivers support 100% duty cycle operation via internal charge pump, eliminating dropout during low-VIN conditions.
It integrates independent INTVCC and EXTVCC LDOs with switchover at 4.7V, allowing efficient external biasing; the MODE pin selects among Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction-each altering transient response and light-load efficiency trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery transients (cold crank, load dump) without external pre-regulation |
| No-Load Quiescent Current | 12µA at 14VIN/3.3VOUT - enables >1-year battery standby in always-on vehicle modules |
| Switching Frequency Range | 100kHz to 3MHz - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI filtering requirements |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.2%) - ensures tight output regulation across temperature and load for precision rails |
| Max Junction Temperature | 150°C - qualified per AEC-Q100 Grade 1, enabling placement near hot engine compartments |
| Current Sense Threshold | 45mV to 55mV - supports accurate current limiting with low-value, low-power sense resistors or DCR sensing |
| Spread Spectrum Enable | PLLIN/SPREAD = INTVCC - reduces peak conducted/radiated EMI by ±10% frequency dither, easing CISPR 25 Class 5 compliance |
Pinout & Package
Package: 16-pin (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Thermally enhanced for 4.2°C/W junction-to-case resistance and AEC-Q100 automotive reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top N-MOSFET Gate Driver Output | Floating driver with INTVCC-referenced swing; supports 100% duty cycle via internal charge pump |
| SW (Pin 2) | Switch Node Connection | Connects to inductor and BOOST capacitor; critical for layout-dependent EMI and efficiency |
| TRACK/SS (Pin 3) | Soft-Start & Output Tracking Input | Internal 12.5µA pull-up enables linear soft-start ramp; also supports voltage tracking of other rails |
| SENSE+ (Pin 4) | Current Sense Positive Input | Differential input for RSENSE or DCR sensing; used with SENSE– to set current limit threshold |
| SENSE– (Pin 5) | Current Sense Negative Input | Supplies sleep-mode current when ≥3.2V, reducing VIN-referred IQ by VIN/VOUT×efficiency ratio |
| VFB (Pin 6) | Error Amplifier Feedback Input | Compares output divider voltage to 0.8V reference; sets regulated output voltage |
| ITH (Pin 7) | Error Amplifier Output / Compensation | Direct connection point for OPTI-LOOP compensation network; controls current limit and loop stability |
| RUN (Pin 8) | Enable & Shutdown Control | 1.2V threshold enables operation; <0.7V forces 1.2µA shutdown IQ and disables INTVCC LDOs |
| FREQ (Pin 9) | Frequency Programming Input | Resistor-to-GND sets VCO frequency from 100kHz to 3MHz; tie to INTVCC for 2.25MHz fixed operation |
| PLLIN/SPREAD (Pin 10) | Synchronization & Spread Spectrum Control | Accepts external clock for phase-locking; tie to INTVCC to enable spread spectrum dithering |
| MODE (Pin 11) | Light-Load Operation Mode Select | GND = Burst Mode (lowest IQ); INTVCC = Continuous; 100k-to-INTVCC = Pulse-Skipping |
| INTVCC (Pin 12) | Internal 5.15V LDO Output | Powers gate drivers and control logic; requires ≥4.7µF ceramic decoupling to GND |
| EXTVCC (Pin 13) | External Bias Input for INTVCC LDO | Enables switchover to external supply >4.7V, bypassing VIN LDO for higher efficiency |
| VIN (Pin 14) | Main Input Supply | Bias source for internal LDOs when EXTVCC is inactive; requires local ceramic bypass |
| BG (Pin 15) | Bottom N-MOSFET Gate Driver Output | GND-to-INTVCC swing driver; complements TG for synchronous rectification |
| BOOST (Pin 16) | Bootstrap Supply for TG Driver | Connects to SW via capacitor; Schottky diode to INTVCC maintains gate drive during 100% duty cycle |
| GND (Pin 17) | Power & Signal Ground (Exposed Pad) | Must be soldered to PCB thermal plane; serves as return for MOSFET sources, CIN, COUT, and small-signal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Capability | Internal charge pump sustains top-FET gate drive during VIN-to-VOUT dropout, enabling PassThru™ operation in automotive cold-crank scenarios |
| Spread Spectrum Modulation | Reduces peak EMI amplitude by spreading energy over ±10% bandwidth, simplifying compliance with CISPR 25 radiated emissions limits |
| OPTI-LOOP Compensation | Allows stable loop response across wide range of output capacitor types (ceramic, polymer, electrolytic) and ESR values without redesign |
| AEC-Q100 Qualified (Grade 1) | Validated for –40°C to +150°C operation, including HTOL, TC, and ESD testing-suitable for under-hood automotive applications |
| Selectably Optimized Light-Load Efficiency | Burst Mode (12µA IQ), Pulse-Skipping, or Forced Continuous modes let designers balance standby time vs. output ripple vs. transient response |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Regulating 12V battery input to stable 3.3V/5V for microcontroller, CAN transceivers, and sensor interfaces in harsh under-hood environments. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, high-reliability power delivery with AEC-Q100 assurance. Use Value: 150°C junction rating and 40V max input withstand load dump transients; 12µA IQ extends battery life during vehicle sleep mode. | Use Scenario: Generating isolated gate-drive supplies and auxiliary rails for IGBT/MOSFET drivers in servo and variable-frequency drives. IC Role / Device Role / Timing Role: High-current step-down controller interfacing with discrete power stage; supports RSENSE or DCR sensing for accurate current protection. Use Value: Programmable 100kHz–3MHz frequency avoids audible noise and aligns with system clock domains; spread spectrum eases EMC certification. |
| Military Avionics Power Management | Telecom Base Station DC-DC Conversion |
Use Scenario: Converting 28V aircraft bus to tightly regulated 1.2V–12V rails for FPGAs, ADCs, and RF front-end ICs in vibration- and temperature-stressed enclosures. IC Role / Device Role / Timing Role: Precision current-mode controller delivering low-noise, low-ripple outputs with phase-lock capability for synchronized multi-rail sequencing. Use Value: 0.8V feedback reference with ±1.2% tolerance ensures <±1% output accuracy; PLLIN input enables deterministic timing across distributed power systems. | Use Scenario: Intermediate bus conversion (48V → 12V/5V) in 5G base station power shelves requiring high density and low EMI. IC Role / Device Role / Timing Role: High-frequency (up to 3MHz) synchronous controller minimizing inductor/capacitor footprint while maintaining >95% efficiency at full load. Use Value: 3mm × 3mm QFN package enables compact layout; spread spectrum and optimized gate drive reduce conducted noise on shared backplane supplies. |
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 |
|---|---|---|---|
| LTC7804JUD#WTRPBF | Higher 5MHz max frequency; integrated MOSFET drivers rated for 6A peak; adds PMBus interface | Targeted at higher-density, digitally managed power systems where telemetry and dynamic margining are required | Choose LTC7804JUD#WTRPBF only if digital control, higher frequency, or higher gate drive current is needed-LTC7803JUD#WTRPBF offers lower cost and simpler analog design |
| MP2918GL-Z | Monolithic 6A buck converter (integrated MOSFETs); 4.5V–18V input; no spread spectrum; 170µA IQ | Suitable for space-constrained, medium-power applications where integration outweighs EMI and ultra-low IQ requirements | Choose MP2918GL-Z for board area savings and simplified BOM in non-automotive, non-EMI-critical designs; LTC7803JUD#WTRPBF retains superior input range, IQ, and EMI performance |
Compared with LTC7804JUD#WTRPBF and MP2918GL-Z, the LTC7803JUD#WTRPBF uniquely balances ultra-low 12µA quiescent current, 40V input capability, AEC-Q100 qualification, and spread spectrum-making it optimal for automotive and industrial systems demanding long battery life, robust transient handling, and EMI compliance without digital overhead.
Availability
LTC7803JUD#WTRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, military avionics power supplies, and telecom base station intermediate bus conversion requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LTC7803JUD#WTRPBF 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 industrial, automotive, communications, and healthcare markets.
The LTC7803 belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, high-reliability DC/DC conversion in automotive and industrial environments where wide input range, low IQ, and EMI robustness are critical.
FAQ
What is the maximum operating junction temperature for the LTC7803JUD#WTRPBF?
The LTC7803JUD#WTRPBF is guaranteed to operate over a junction temperature range of –40°C to +150°C and is AEC-Q100 qualified for automotive Grade 1 applications. This rating enables reliable deployment in under-hood locations and high-ambient industrial settings where thermal management is constrained. The device includes thermal shutdown protection that activates above 165°C to prevent permanent damage.
Does the LTC7803JUD#WTRPBF support both RSENSE and DCR current sensing?
Yes, the LTC7803JUD#WTRPBF supports both RSENSE and DCR current sensing through its differential SENSE+ and SENSE– inputs. The current sense threshold is adjustable via the ITH voltage and remains stable across temperature, with a typical value of 50mV. This dual-sensing capability allows designers to optimize for accuracy (RSENSE) or cost/PCB area (DCR), depending on application requirements.
How does the spread spectrum feature of the LTC7803JUD#WTRPBF reduce EMI?
The LTC7803JUD#WTRPBF reduces peak conducted and radiated EMI by modulating its switching frequency ±10% around the nominal value when PLLIN/SPREAD is tied to INTVCC. This dithering spreads energy across a wider bandwidth, lowering spectral amplitude at any single frequency-directly easing compliance with CISPR 25 Class 5 and FCC Part 15 limits without adding external filters or shielding.
Can the LTC7803JUD#WTRPBF achieve 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803JUD#WTRPBF achieves true 100% duty cycle operation using an internal charge pump that maintains BOOST voltage even when VIN approaches VOUT. This eliminates dropout during automotive cold-crank events (e.g., 5V input to 3.3V output) and enables PassThru™ functionality. No external components beyond the standard BOOST capacitor and Schottky diode are required.
What is the purpose of the EXTVCC pin on the LTC7803JUD#WTRPBF, and when should it be used?
The EXTVCC pin on the LTC7803JUD#WTRPBF provides an alternative bias source for the INTVCC LDO. When driven above 4.7V, it disables the VIN-based LDO and powers INTVCC from the external supply-reducing total input current and improving overall system efficiency. It is recommended in designs where a clean, efficient auxiliary rail (e.g., 5V or 12V) is already available on the board.
LTC7803JUD#WTRPBF 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC7803JUD#WTRPBF FAQ
1.How can I place an order for LTC7803JUD#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803JUD#WTRPBF 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#WTRPBF reliable?
The price and inventory of LTC7803JUD#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803JUD#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803JUD#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803JUD#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803JUD#WTRPBF?
LTC7803JUD#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803JUD#WTRPBF 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#WTRPBF?
For technical support, including LTC7803JUD#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803JUD#WTRPBF requirements.
6.How does Aetrix verify that LTC7803JUD#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803JUD#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803JUD#WTRPBF?
All LTC7803JUD#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803JUD#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LTC7803JUD#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7803JUD#WTRPBF 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…
