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Analog Devices Inc. LTC7803HUD#TRPBF
- Part No.:
- LTC7803HUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803HUD#TRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
LTC7803HUD#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 - ideal for automotive infotainment power supplies requiring low IQ and robust noise immunity.
For engineers reviewing the LTC7803HUD#TRPBF datasheet, LTC7803HUD#TRPBF pinout, LTC7803HUD#TRPBF application, or LTC7803HUD#TRPBF equivalent, key selection considerations include its 3MHz programmable switching frequency, RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation, PassThru™ capability, and AEC-Q100 qualification for automotive-grade thermal reliability.
Technical Context
The LTC7803HUD#TRPBF implements a constant-frequency peak current mode control architecture with phase-lockable oscillator (100kHz–3MHz), enabling precise timing synchronization in multi-rail systems. Its dual-mode gate drivers support both high-side (TG) and low-side (BG) N-MOSFETs with 3Ω pull-up/pull-down resistance and sub-25ns transition times.
It integrates an internal 5.15V INTVCC LDO powered either from VIN or EXTVCC (switchover at 4.7V), plus a charge pump enabling true 100% duty cycle operation during dropout. Spread spectrum dithering is activated via PLLIN/SPREAD = INTVCC, reducing peak conducted/radiated emissions without external components.
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 - extends runtime in always-on vehicle modules like telematics or ADAS sensors. |
| Switching Frequency Range | 100kHz to 3MHz (programmable via FREQ pin resistor) - enables compact magnetics and avoids AM band interference. |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.5% over temp) - sets precise output regulation with minimal error amplifier drift. |
| Current Sense Threshold | 45mV to 55mV max - allows accurate current limiting with low-value, low-power sense resistors or DCR sensing. |
| Shutdown Current | 1.2µA - ensures ultra-low leakage during system sleep states compliant with ISO 16750-2. |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top Gate Driver Output | Floating high-side driver output referenced to SW node; drives N-MOSFET gate with INTVCC swing above SW. |
| SW (Pin 2) | Switch Node | Connection point between TG and BG outputs and external inductor; critical for bootstrap capacitor recharge 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 detect inductor current via RSENSE or DCR. |
| SENSE– (Pin 5) | Current Sense Negative Input | Reference input for current sensing; supplies sleep-mode bias current when ≥3.2V, reducing VIN-referred IQ. |
| VFB (Pin 6) | Error Amplifier Feedback | Compares output voltage (via resistor divider) to 0.8V reference; primary regulation node for closed-loop stability. |
| ITH (Pin 7) | Error Amplifier Output | Transconductance amplifier output controlling peak current limit; compensation network connects here to GND. |
| RUN (Pin 8) | Enable/Shutdown Control | Logic-level input: <1.1V disables regulation; <0.7V shuts down INTVCC LDO and reduces IQ to 1.2µA. |
| FREQ (Pin 9) | Frequency Programming | 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 | Accepts external clock for phase-locking; tied to INTVCC enables spread spectrum; tied to GND disables dithering. |
| MODE (Pin 11) | Light-Load Operation Mode | Selects Burst Mode (GND), pulse-skipping (100kΩ to INTVCC), or forced continuous (INTVCC). |
| INTVCC (Pin 12) | Internal LDO Output | 5.15V regulated supply for gate drivers and logic; requires ≥4.7µF ceramic decoupling to GND. |
| EXTVCC (Pin 13) | External Bias Input | Enables alternate LDO path for INTVCC when >4.7V applied; bypasses VIN LDO to improve efficiency. |
| VIN (Pin 14) | Main Input Supply | Bias input for internal circuits and VIN LDO; requires local ceramic bypass capacitor to GND. |
| BG (Pin 15) | Bottom Gate Driver Output | Low-side N-MOSFET gate driver referenced to GND; swings from GND to INTVCC. |
| BOOST (Pin 16) | Bootstrap Supply | Charged via external Schottky diode from INTVCC; provides floating bias for TG driver during high-side conduction. |
| GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; must be soldered to PCB plane for thermal performance and low-noise small-signal grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak EMI by ±10% frequency dithering without external components - simplifies EMC certification for automotive designs. |
| OPTI-LOOP Compensation | Allows stable loop response across wide range of output capacitor ESR and capacitance values - eliminates need for custom compensation per design. |
| PassThru™ / 100% Duty Cycle | Enables seamless dropout operation down to VOUT ≈ VIN using internal charge pump - maintains regulation during low-input conditions like cold-crank. |
| AEC-Q100 Qualified | Rated for –40°C to +150°C junction temperature with full automotive reliability testing - suitable for engine control, ADAS, and body electronics. |
| Selectably Optimized Light-Load Efficiency | Three modes (Burst, pulse-skipping, forced continuous) let designers trade off ripple, efficiency, and EMI for specific system requirements. |
Applications
| Automotive Infotainment Power | Industrial Motor Drive Auxiliary Supply |
|---|---|
Use Scenario: Powering DSP, FPGA, and display controllers in head units with wide battery input (6V–16V) and strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 3.3V/5V rails from unregulated 12V battery; uses spread spectrum and phase-locking to avoid RF interference with AM/FM receivers. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep; AEC-Q100 qualification ensures reliability in under-dash thermal environments. | Use Scenario: Generating isolated gate drive and logic supplies for IGBT/SiC inverters in factory automation systems. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck controller powering auxiliary 15V and 5V rails from 24V/48V industrial bus; synchronized to main PWM clock via PLLIN. Use Value: 3MHz operation enables small inductors and low-profile magnetics; 40V input rating accommodates 48V bus transients without derating. |
| Military Vehicle DC-DC Conversion | Telecom Base Station Power Management |
Use Scenario: Converting 28V aircraft or armored vehicle bus to 12V/5V for avionics displays and comms modules. IC Role / Device Role / Timing Role: Radiation-tolerant (by design), high-temp buck controller supporting MIL-STD-704 input transients; uses RSENSE sensing for precision current limiting. Use Value: 150°C junction rating and 40V absolute max input withstand harsh environmental stress; PassThru™ ensures uninterrupted operation during brownouts. | Use Scenario: Regulating intermediate 12V rail from 48V telecom rectifier for baseband processing boards with dynamic load steps. IC Role / Device Role / Timing Role: Fast-transient buck controller with OPTI-LOOP compensation delivering 20A peak current; MODE pin selects pulse-skipping for balanced ripple/efficiency. Use Value: 100% duty cycle capability maintains regulation during 48V input dips; low shutdown IQ (<2µA) meets NEBS Level 3 standby requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7804HUD#TRPBF | Higher 5MHz max frequency; integrated MOSFET drivers optimized for lower RDS(on) FETs; no spread spectrum. | Better suited for ultra-compact, high-density 5V/3.3V point-of-load designs where EMI is managed externally. | Choose LTC7804 when board space is constrained and higher switching frequency justifies added cost and complexity. |
| MP2918GL-Z | Lower 2.5MHz max frequency; no spread spectrum; lacks AEC-Q100 qualification; 20µA IQ. | Targeted at cost-sensitive industrial power supplies where automotive qualification and lowest IQ are not required. | Choose MP2918 for non-automotive applications needing basic high-efficiency buck control with simpler BOM. |
Compared with LTC7804HUD#TRPBF and MP2918GL-Z, the LTC7803HUD#TRPBF uniquely balances ultra-low 12µA IQ, AEC-Q100 Grade H qualification, and integrated spread spectrum - making it the only option among the three qualified for safety-critical automotive power rails with stringent EMI and thermal requirements.
Availability
LTC7803HUD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial motor drive auxiliary supplies, military vehicle DC-DC conversion, and telecom base station power management requiring stable component supply and long-term lifecycle support.
Supply support for LTC7803HUD#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 industrial, automotive, communications, and healthcare markets.
The LTC7803HUD#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, wide-input, automotive-qualified DC/DC conversion in thermally demanding environments.
FAQ
What is the maximum operating junction temperature for the LTC7803HUD#TRPBF?
The LTC7803HUD#TRPBF is rated for –40°C to +150°C operating junction temperature and is qualified per AEC-Q100 Grade H. This specification is validated through production testing and thermal characterization, ensuring reliable operation in under-hood automotive applications where ambient temperatures exceed 105°C.
Does the LTC7803HUD#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803HUD#TRPBF supports true 100% duty cycle operation via an internal charge pump that sustains BOOST voltage during dropout. When VIN approaches VOUT, the controller activates the charge pump to maintain sufficient gate drive for the top MOSFET - enabling seamless regulation without external circuitry or loss of control.
How does spread spectrum operation reduce EMI in the LTC7803HUD#TRPBF?
The LTC7803HUD#TRPBF reduces peak conducted and radiated 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 spectral peaks - a feature verified in CISPR 25 Class 5 automotive EMC testing without additional filtering.
Can the LTC7803HUD#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC7803HUD#TRPBF accepts external synchronization on the PLLIN/SPREAD pin across 100kHz to 3MHz. The internal PLL locks the rising edge of the TG signal to the external clock's rising edge, enabling deterministic timing in multi-phase or noise-sensitive systems such as radar or high-speed data acquisition.
What is the purpose of the SENSE– pin in light-load operation of the LTC7803HUD#TRPBF?
In light-load operation, when SENSE– voltage reaches ≥3.2V, it supplies the majority of the LTC7803HUD#TRPBF's sleep-mode quiescent current instead of VIN. This reduces input-referred IQ by the ratio (VIN/VOUT) × efficiency - a key enabler for ultra-low-power automotive always-on functions like CAN wake-up receivers.
LTC7803HUD#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC7803HUD#TRPBF FAQ
1.How can I place an order for LTC7803HUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803HUD#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 LTC7803HUD#TRPBF reliable?
The price and inventory of LTC7803HUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803HUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803HUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803HUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803HUD#TRPBF?
LTC7803HUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803HUD#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 LTC7803HUD#TRPBF?
For technical support, including LTC7803HUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803HUD#TRPBF requirements.
6.How does Aetrix verify that LTC7803HUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803HUD#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 LTC7803HUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803HUD#TRPBF?
All LTC7803HUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803HUD#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 LTC7803HUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7803HUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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