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Analog Devices Inc. LTC7803HUD#PBF
- Part No.:
- LTC7803HUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803HUD#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:193
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Product details
Overview
LTC7803HUD#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 high-efficiency power conversion in automotive infotainment power supplies.
For engineers reviewing the LTC7803HUD#PBF datasheet, LTC7803HUD#PBF pinout, LTC7803HUD#PBF application, or LTC7803HUD#PBF equivalent, key selection criteria include its RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation for wide output capacitor/ESR ranges, AEC-Q100 qualification, and thermally enhanced 3mm × 3mm QFN package with exposed GND pad.
Technical Context
The LTC7803HUD#PBF implements a constant-frequency peak current mode control architecture with integrated transconductance error amplifier (gm = 2 mmho), programmable soft-start via internal 12.5µA TRACK/SS pull-up, and dual LDOs (INTVCC at 5.15V ±2%, EXTVCC switchover at 4.7V). Its 100% duty cycle capability relies on an internal charge pump supporting continuous top-FET conduction during dropout.
It supports three light-load operating modes selected by the MODE pin: Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction. Spread spectrum dithering (0–20% relative to fOSC) is enabled by pulling PLLIN/SPREAD to INTVCC, while external synchronization (0.1–3MHz) is achieved via the same pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery transients and industrial 24V/36V rails without pre-regulation. |
| No-Load Quiescent Current | 12µA at 14VIN → 3.3VOUT - extends runtime in always-on vehicle modules and battery-backed systems. |
| Switching Frequency Range | 100kHz to 3MHz (programmable via FREQ pin resistor) - enables compact magnetics and noise shaping above AM band. |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.2% over temp) - sets precise output regulation with minimal drift across –40°C to 150°C junction range. |
| Current Sense Threshold | 45mV to 55mV max - allows accurate current limiting with low-value, low-power sense resistors or DCR sensing networks. |
| Operating Junction Temperature | –40°C to 150°C - qualified for under-hood automotive applications per AEC-Q100 Grade H. |
| Package Thermal Resistance | θJA = 68°C/W, θJC = 4.2°C/W (QFN) - enables high-power density designs with minimal heatsinking when exposed pad is soldered. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed GND pad (Pin 17), rated for –40°C to 150°C operation. Exposed pad must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top Gate Driver Output | Floating high-side N-MOSFET gate drive with INTVCC-referenced swing; supports 100% duty cycle via internal charge pump. |
| SW (Pin 2) | Switch Node | Connection point between TG, BG, and external inductor; defines switching waveform and bootstrap capacitor charging path. |
| 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 analog circuitry; requires ≥4.7µF ceramic decoupling to GND for stability. |
| MODE (Pin 11) | Light-Load Operation Select | GND = Burst Mode (ultra-low IQ), INTVCC = forced CCM, INTVCC + 100kΩ = pulse-skipping - configures efficiency vs. ripple trade-off. |
| PLLIN/SPREAD (Pin 10) | Synchronization & Spread Spectrum Control | INTVCC = enable spread spectrum; external clock = phase-lock to system timing source; GND = disable dithering. |
| GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; must be soldered to PCB plane for thermal dissipation and low-noise small-signal reference. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Capability | Enables VIN-to-VOUT dropout operation down to ΔV = ~0.1V using internal charge pump - critical for automotive cold-crank scenarios. |
| Spread Spectrum Modulation | Reduces peak conducted/EMI emissions by spreading oscillator energy across ±10% bandwidth - simplifies EMC compliance without added filters. |
| OPTI-LOOP Compensation | Allows stable loop response across wide range of output capacitor types (ceramic, polymer, electrolytic) and ESR values (0.5mΩ–100mΩ). |
| AEC-Q100 Qualified | Grade H (–40°C to 150°C) qualification ensures reliability in automotive powertrain, ADAS, and infotainment subsystems. |
| RSENSE or DCR Sensing | Flexible current sensing supports either precision shunt resistors or lossless inductor DCR networks - reduces BOM cost and board space. |
Applications
| Automotive Infotainment Power | Industrial 24V DC-DC Conversion |
|---|---|
Use Scenario: Powering 3.3V/5V logic rails in head units, display controllers, and telematics modules from 9V–16V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current (up to 20A) conversion with Burst Mode for standby efficiency. Use Value: 12µA IQ extends battery life during vehicle sleep mode; 100% duty cycle maintains output during 4.5V battery dips; AEC-Q100 ensures field reliability. |
Use Scenario: Generating isolated or non-isolated 12V/15V rails for PLC I/O modules, motor drives, and sensor interfaces from unregulated 24V factory bus. IC Role / Device Role / Timing Role: High-voltage input controller enabling compact, efficient step-down with programmable frequency to avoid noise-sensitive bands. Use Value: 40V max input withstands 24V rail surges; spread spectrum lowers EMI in dense industrial cabinets; QFN package supports high-power density layouts. |
| Avionics Power Conditioning | Telecom Base Station Bias |
Use Scenario: Regulating 28V aircraft bus to 5V/3.3V for flight control computers and navigation sensors requiring low EMI and high MTBF. IC Role / Device Role / Timing Role: EMI-optimized controller with phase-lockable frequency for synchronized switching in multi-rail avionics power systems. Use Value: Spread spectrum + phase-locking minimizes beat frequencies; 150°C junction rating supports conduction-cooled enclosures; low shutdown IQ (1.2µA) preserves backup power. |
Use Scenario: Providing stable 12V bias for RF power amplifiers and fronthaul optics in 4G/5G macro base stations powered from –48V telecom rectifiers. IC Role / Device Role / Timing Role: High-efficiency front-end controller stepping –48V (via intermediate 12V bus) to clean 12V loads with minimal heat generation. Use Value: 3MHz max frequency enables ultra-small inductors; 40V output capability supports auxiliary bias rails; low thermal resistance (θJC = 4.2°C/W) eases thermal design. |
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 |
|---|---|---|---|
| LTC7801IUFD#PBF | Lower max input (40V same), but no spread spectrum, lower max freq (1MHz), no AEC-Q100 grade - lacks EMI mitigation and automotive qualification. | Best for cost-sensitive industrial supplies where EMI is managed externally and temperature range ≤125°C suffices. | Select when spread spectrum and 150°C operation are unnecessary; verify light-load mode compatibility (no Burst Mode). |
| MP2918GL-Z | Monolithic 3A buck (not controller); fixed 500kHz, no programmable freq, no spread spectrum, no 100% duty cycle - integrates MOSFETs but sacrifices flexibility and dropout capability. | Suitable for low-power auxiliary rails (<3A) where board space is constrained and full controller features are overkill. | Choose only for sub-3A loads; cannot replace LTC7803HUD#PBF in high-current or high-input-voltage designs due to integration limits. |
Compared with LTC7801IUFD#PBF, the LTC7803HUD#PBF adds spread spectrum, AEC-Q100 qualification, and 3MHz operation - essential for automotive EMI compliance and high-density designs. Versus MP2918GL-Z, it offers scalable current handling, external MOSFET selection, and true 100% duty cycle - enabling robust, field-proven power architectures beyond monolithic limits.
Availability
LTC7803HUD#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V DC-DC conversion, avionics power conditioning, and telecom base station bias applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC7803HUD#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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC7803 belongs to Analog Devices' Power by Linear™ high-voltage controller family, designed specifically for demanding automotive and industrial DC-DC conversion where efficiency, EMI control, thermal resilience, and functional safety are critical.
FAQ
What is the maximum output voltage supported by the LTC7803HUD#PBF?
The LTC7803HUD#PBF supports output voltages up to 40V. This is achieved by regulating the feedback node (VFB) to 0.8V using an external resistor divider, allowing scalable output configuration independent of input voltage - critical for generating auxiliary rails in telecom and industrial systems.
Does the LTC7803HUD#PBF require external MOSFETs, and what type are supported?
Yes, the LTC7803HUD#PBF is a controller IC and requires external N-channel MOSFETs for both high-side (TG) and low-side (BG) switching. It supports standard logic-level and high-voltage N-MOSFETs with gate thresholds compatible with its 5.15V INTVCC supply and floating top-driver architecture.
How does the spread spectrum feature of the LTC7803HUD#PBF reduce EMI?
The LTC7803HUD#PBF reduces peak radiated and conducted EMI by dithering its switching frequency ±10% around the nominal value when PLLIN/SPREAD is tied to INTVCC. This spreads energy across a wider bandwidth, lowering amplitude at any single frequency - easing compliance with CISPR 25 Class 5 and EN 55022 standards.
What is the purpose of the EXTVCC pin on the LTC7803HUD#PBF?
The EXTVCC pin on the LTC7803HUD#PBF provides an alternative input to the internal 5.15V LDO that powers gate drivers and analog circuitry. When EXTVCC exceeds 4.7V, it bypasses the VIN-based LDO, reducing input supply current and improving overall system efficiency - especially useful when a clean, regulated auxiliary rail is available.
Is the LTC7803HUD#PBF pin-compatible with other members of the LTC780x family?
No, the LTC7803HUD#PBF is not pin-compatible with earlier LTC7801 or LTC7802 variants. While sharing functional similarities, its pin assignments (e.g., PLLIN/SPREAD on Pin 10, MODE on Pin 11) and internal features (spread spectrum, higher frequency range) differ - requiring dedicated PCB layout and validation for each variant.
LTC7803HUD#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)
LTC7803HUD#PBF FAQ
1.How can I place an order for LTC7803HUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803HUD#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 LTC7803HUD#PBF reliable?
The price and inventory of LTC7803HUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803HUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC7803HUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803HUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803HUD#PBF?
LTC7803HUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803HUD#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 LTC7803HUD#PBF?
For technical support, including LTC7803HUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803HUD#PBF requirements.
6.How does Aetrix verify that LTC7803HUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7803HUD#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 LTC7803HUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC7803HUD#PBF?
All LTC7803HUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803HUD#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 LTC7803HUD#PBF part is unused and in its original packaging.
Return procedure for LTC7803HUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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