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Analog Devices Inc. LTC7803EUD#PBF
- Part No.:
- LTC7803EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803EUD#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
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Product details
Overview
LTC7803EUD#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, features 12µA no-load quiescent current, 3MHz programmable switching frequency, and spread spectrum EMI reduction-designed for automotive infotainment power rails requiring low IQ and robust noise immunity.
For engineers reviewing the LTC7803EUD#PBF datasheet, LTC7803EUD#PBF pinout, LTC7803EUD#PBF application, or LTC7803EUD#PBF equivalent, key selection criteria include RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation for wide output capacitor ESR ranges, selectable light-load modes (Burst/Pulse-Skipping/Continuous), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7803EUD#PBF implements a constant-frequency peak current mode control architecture with phase-lockable oscillator (100kHz–3MHz) and integrated spread spectrum dithering to suppress conducted/EMI emissions. Its dual-mode gate drivers support 100% duty cycle operation via internal charge pump during dropout, enabling seamless regulation down to VOUT ≈ VIN.
It integrates independent INTVCC LDO (5.15V, ±2%) and EXTVCC switchover logic (4.7V threshold), allowing external bias to reduce system-level quiescent current. The MODE pin selects among Burst Mode (14µA sleep IQ), pulse-skipping, or forced continuous conduction-each with distinct transient response and ripple trade-offs confirmed in load-step waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports 12V/24V/36V automotive and industrial bus inputs without pre-regulation. |
| No-Load Quiescent Current | 12µA at 14VIN→3.3VOUT - extends battery runtime in always-on vehicle modules. |
| Switching Frequency | Programmable 100kHz–3MHz - enables compact magnetics and avoids AM band interference. |
| Feedback Reference Voltage | 0.792V to 0.808V (±1%) - ensures tight output regulation across temperature and load. |
| Current Sense Threshold | 45mV to 55mV - sets precise overcurrent protection with minimal power loss in RSENSE. |
| Shutdown Current | 1.2µA - meets ultra-low-power requirements for ignition-off subsystems. |
| Package | 16-pin 3mm × 3mm QFN with exposed GND pad - provides θJA = 68°C/W for thermally constrained layouts. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB for rated thermal performance (θJC = 4.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top Gate Driver Output | Floating high-side N-MOSFET driver with INTVCC-referenced swing; supports 100% duty cycle via charge pump. |
| SW (Pin 2) | Switch Node | Connection point between external inductor and both MOSFETs; critical for layout EMI control. |
| TRACK/SS (Pin 3) | Soft-Start & Tracking Input | Internal 12.5µA pull-up charges external capacitor for controlled ramp-up; enables supply tracking. |
| SENSE+ (Pin 4) | Current Sense Positive Input | Differential input for RSENSE/DCR sensing; used with SENSE– to set current limit threshold. |
| SENSE– (Pin 5) | Current Sense Negative Input | Supplies sleep-mode bias current when ≥3.2V, reducing input-referred IQ by VIN/VOUT × efficiency. |
| VFB (Pin 6) | Feedback Input | Compares output voltage (via resistor divider) to 0.8V reference; determines regulated VOUT. |
| ITH (Pin 7) | Error Amplifier Output | Compensation node; voltage controls peak inductor current; connects to RC network for loop stability. |
| RUN (Pin 8) | Enable/Shutdown Control | 1.2V threshold enables operation; <0.7V forces 1.2µA shutdown state with full circuit disable. |
| FREQ (Pin 9) | Frequency Programming | Resistor-to-GND sets fSW from 100kHz–3MHz; tie to INTVCC for 2.25MHz fixed operation. |
| PLLIN/SPREAD (Pin 10) | Synchronization & Spread Spectrum | Accepts external clock for phase-locking; tie to INTVCC to enable EMI-reducing frequency dithering. |
| MODE (Pin 11) | Light-Load Operation Mode | GND = Burst Mode (14µA IQ); INTVCC = Continuous; 100k-to-INTVCC = Pulse-Skipping. |
| INTVCC (Pin 12) | Internal LDO Output | 5.15V ±2% supply for drivers and logic; requires ≥4.7µF ceramic decoupling to GND. |
| EXTVCC (Pin 13) | External Bias Input | Enables switchover to external 4.8V–30V source to bypass VIN LDO and lower system IQ. |
| VIN (Pin 14) | Main Input Supply | Bias rail for internal LDO; requires local ceramic bypass capacitor to GND. |
| BG (Pin 15) | Bottom Gate Driver Output | Ground-referenced N-MOSFET driver; complements TG for synchronous rectification. |
| BOOST (Pin 16) | Bootstrap Supply | Connects to SW via capacitor and to INTVCC via Schottky diode; sustains top-FET drive during high-duty cycles. |
| GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; must be soldered to PCB plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak radiated/conducted EMI by spreading oscillator energy across ±20% bandwidth-critical for automotive CISPR 25 compliance. |
| OPTI-LOOP Compensation | Allows stable loop response across wide range of output capacitor values and ESR (e.g., ceramic + polymer combinations), eliminating need for redesign per capacitor type. |
| PassThru™ / 100% Duty Cycle | Internal charge pump maintains top-FET gate drive even when VIN approaches VOUT-enabling dropout-free operation in automotive cold-crank scenarios (VIN ↓ to 4.5V). |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature (Grade E), with validated HTOL, TC, and ESD performance for under-hood automotive applications. |
| Selectably Optimized Light-Load Efficiency | Three distinct modes: Burst Mode (14µA IQ), Pulse-Skipping (low ripple), or Forced Continuous (best transient response)-user-selectable per system requirement. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/5V rails for head-unit processors, display controllers, and audio codecs in vehicles with 12V/24V battery systems subject to cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating main domain supplies; manages dynamic load steps up to 10A with sub-200µs recovery. Use Value: 12µA no-load IQ extends battery reserve time; spread spectrum reduces EMI filtering cost; AEC-Q100 ensures reliability in harsh environments. | Use Scenario: Generating isolated 5V/12V auxiliary supplies for analog sensor interfaces and digital I/O in factory automation controllers operating from 24V DC industrial buses. IC Role / Device Role / Timing Role: High-efficiency step-down controller driving discrete N-MOSFETs; supports wide input range to tolerate brownouts and surges on DIN-rail power. Use Value: 4.5V–40V input range accommodates 24V nominal with ±20% tolerance; RSENSE/DCR sensing enables flexible current monitoring; 3MHz capability allows small inductors. |
| Military Vehicle Comms | Telecom Base Station Bias |
Use Scenario: Providing tightly regulated 3.3V/12V supplies for RF front-end modules and FPGA configuration in mobile tactical radios powered from 28V aircraft systems. IC Role / Device Role / Timing Role: EMI-hardened controller with phase-lockable frequency to synchronize switching with baseband clocks and avoid heterodyne interference. Use Value: PLLIN/SPREAD pin enables deterministic clock alignment; 150°C-rated variants available; low IQ preserves battery life during standby. | Use Scenario: Generating intermediate 5V/12V rails for optical transceiver bias and microcontroller subsystems in 48V-powered telecom equipment with strict thermal limits. IC Role / Device Role / Timing Role: High-frequency (up to 3MHz) synchronous controller minimizing inductor size and board area in dense 1RU chassis. Use Value: 3mm × 3mm QFN package enables high-density layout; 68°C/W θJA supports natural convection cooling; EXTVCC option lowers total system IQ. |
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 |
|---|---|---|---|
| LTC7804EUD#PBF | Higher max fSW (4MHz), improved current sense accuracy (±0.5%), enhanced UVLO hysteresis. | Preferred for >3MHz designs or where tighter OCP tolerance is required. | Choose LTC7804EUD#PBF if 4MHz operation or ±0.5% current sense accuracy is mandatory; otherwise LTC7803EUD#PBF offers optimal cost/performance balance. |
| MP2918GL-Z | Lower IQ (9µA), integrated MOSFET drivers only (no external FET control), fixed 500kHz/1MHz options. | Suitable for space-constrained, lower-current (<15A) applications where integrated solution suffices. | Choose MP2918GL-Z only for compact, lower-power designs where external FET control and 100% duty cycle are not needed. |
Compared with LTC7804EUD#PBF, the LTC7803EUD#PBF trades 1MHz higher max frequency and tighter current sense for lower cost and proven field reliability in automotive Grade E; versus MP2918GL-Z, it provides full external FET control, 100% duty cycle, and programmable frequency-essential for high-flexibility, high-reliability power architectures.
Availability
LTC7803EUD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, and military communications systems requiring stable component supply, AEC-Q100 qualification, and low-quiescent-current DC/DC control.
Supply support for LTC7803EUD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC7803EUD#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered for high-efficiency, low-EMI, wide-input synchronous buck regulation in demanding automotive and industrial environments.
FAQ
What is the maximum supported switching frequency for the LTC7803EUD#PBF?
The LTC7803EUD#PBF supports a programmable switching frequency up to 3MHz when the FREQ pin is tied to GND with a 12.5kΩ resistor. At this setting, the device achieves optimal EMI performance and enables use of very small inductors. The datasheet confirms 3MHz as the absolute maximum specified frequency across all operating conditions and temperature grades for the LTC7803EUD#PBF.
Does the LTC7803EUD#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803EUD#PBF supports true 100% duty cycle operation via an internal charge pump that sustains top-gate drive even when VIN approaches VOUT. This PassThru™ functionality is confirmed in the datasheet's "Features" and "Operation" sections and is essential for automotive cold-crank scenarios where input voltage can drop to 4.5V while maintaining regulated output. No external components are required.
How does the LTC7803EUD#PBF reduce electromagnetic interference (EMI)?
The LTC7803EUD#PBF reduces EMI through hardware-enabled spread spectrum dithering-when the PLLIN/SPREAD pin is tied to INTVCC, the oscillator frequency modulates ±20% around its center value, lowering peak spectral energy. This is distinct from external filtering and is validated in conducted/radiated emission tests per CISPR 25, directly reducing filter component count and board area in automotive designs using the LTC7803EUD#PBF.
What are the light-load operation modes available on the LTC7803EUD#PBF, and how are they selected?
The LTC7803EUD#PBF offers three selectable light-load modes via the MODE pin: Burst Mode (pin grounded → 14µA IQ), pulse-skipping (pin tied to INTVCC through 100kΩ → low ripple), or forced continuous conduction (pin tied to INTVCC → best transient response). Each mode is electrically verified in the datasheet's "Features" and "Operation" sections and affects efficiency, output ripple, and load-step behavior distinctly.
Is the LTC7803EUD#PBF qualified for automotive applications, and what grade does it carry?
Yes, the LTC7803EUD#PBF is AEC-Q100 qualified for automotive applications and carries Grade E rating (–40°C to +125°C junction temperature). This qualification is explicitly stated in the "ORDER INFORMATION" table and "Features" section of the datasheet, confirming its suitability for under-hood and infotainment systems where reliability under thermal stress and vibration is mandatory.
LTC7803EUD#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC7803EUD#PBF FAQ
1.How can I place an order for LTC7803EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803EUD#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 LTC7803EUD#PBF reliable?
The price and inventory of LTC7803EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7803EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803EUD#PBF?
LTC7803EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803EUD#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 LTC7803EUD#PBF?
For technical support, including LTC7803EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803EUD#PBF requirements.
6.How does Aetrix verify that LTC7803EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7803EUD#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 LTC7803EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7803EUD#PBF?
All LTC7803EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803EUD#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 LTC7803EUD#PBF part is unused and in its original packaging.
Return procedure for LTC7803EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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