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Analog Devices Inc. LTC7803JUD#TRPBF
- Part No.:
- LTC7803JUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC7803JUD#TRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:4,888
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Product details
Overview
LTC7803JUD#TRPBF 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-used in automotive infotainment power supplies requiring low IQ and high input voltage tolerance.
For engineers reviewing the LTC7803JUD#TRPBF datasheet, LTC7803JUD#TRPBF pinout, LTC7803JUD#TRPBF application, or LTC7803JUD#TRPBF 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).
Technical Context
The LTC7803JUD#TRPBF implements a constant-frequency peak current mode control architecture with phase-lockable oscillator (100kHz–3MHz), enabling precise timing synchronization and jitter-controlled operation. Its dual-mode gate drivers support 100% duty cycle PassThru™ operation via internal charge pump, eliminating dropout at VIN ≈ VOUT.
It integrates independent INTVCC/EXTVCC LDOs with 4.7V switchover threshold, thermally enhanced 3mm × 3mm QFN package with exposed GND pad, and robust protection including undervoltage lockout (4.25V rising), overvoltage feedback clamp (±10%), and thermal shutdown at 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| No-Load Quiescent Current | 12µA at 14VIN/3.3VOUT - extends runtime in always-on vehicle modules and remote sensors. |
| Switching Frequency | Programmable 100kHz–3MHz - enables compact magnetics and noise shaping for EMI-sensitive applications. |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.5%) - ensures tight output regulation across temperature and load for precision rails. |
| Max Junction Temperature | 150°C - qualified per AEC-Q100 Grade 1, enabling under-hood deployment without derating. |
| Current Sense Threshold | 45mV to 55mV - supports accurate, low-loss sensing with RSENSE ≥ 1mΩ or DCR-based designs. |
| Gate Driver On-Resistance | TG/BG: 3Ω pull-up / 1.5Ω pull-down - drives high-side/lower-side N-MOSFETs with fast 15ns transition times. |
Pinout & Package
Package: 16-pin 3mm × 3mm plastic QFN (UD) with exposed GND pad (Pin 17), rated θJA = 68°C/W, θJC = 4.2°C/W. Requires soldering of exposed pad to PCB for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | Top Gate Drive Output | Floating driver output for high-side N-MOSFET; swings INTVCC above SW node voltage. |
| SW (Pin 2) | Switch Node Connection | Connects to inductor and bootstrap capacitor; critical for charge pump operation and 100% duty cycle. |
| TRACK/SS (Pin 3) | Soft-Start & Tracking Input | Internal 12.5µA pull-up sets soft-start ramp; enables output voltage tracking of external supplies. |
| 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) | Error Amplifier Feedback Input | Compares output divider voltage to 0.8V reference; determines regulated output voltage accuracy. |
| ITH (Pin 7) | Error Amplifier Output | Controls peak inductor current; connects to compensation network (RC, CC) for loop stability. |
| RUN (Pin 8) | Enable/Shutdown Control | 1.2V threshold enables operation; <0.7V forces 1.2µA shutdown mode with full circuit disable. |
| FREQ (Pin 9) | VCO Frequency Programming | Resistor-to-GND sets frequency 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 dithering. |
| MODE (Pin 11) | Light-Load Operation Mode | Selects Burst (GND), Pulse-Skipping (100kΩ to INTVCC), or Continuous (INTVCC) conduction. |
| INTVCC (Pin 12) | Internal 5.15V LDO Output | Powers gate drivers and analog circuits; requires ≥4.7µF ceramic decoupling to GND. |
| EXTVCC (Pin 13) | External Bias Input | Bypasses VIN LDO when >4.7V; reduces system power loss by sourcing INTVCC from efficient secondary rail. |
| VIN (Pin 14) | Main Input Supply | Bias source for internal LDOs and logic; requires local ceramic bypass capacitor to GND. |
| BG (Pin 15) | Bottom Gate Drive Output | Drives synchronous rectifier N-MOSFET; swings from GND to INTVCC with 1.5Ω pull-down. |
| BOOST (Pin 16) | Bootstrap Supply | Charged via Schottky diode from INTVCC; sustains top-FET drive during high-duty-cycle operation. |
| GND (Pin 17) | Power & Signal Ground | Exposed thermal pad; must be soldered to PCB plane for thermal management and low-noise return path. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Modulation | Reduces peak conducted/radiated EMI by ±10% frequency dithering, easing CISPR 25 Class 5 compliance. |
| OPTI-LOOP Compensation | Enables stable loop response across wide range of output capacitor ESR (0.5mΩ–100mΩ) and capacitance (10µF–1000µF). |
| PassThru™ 100% Duty Cycle | Internal charge pump maintains top-FET gate drive down to VIN – VOUT ≤ 100mV, supporting seamless dropout recovery. |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +150°C operation with HTOL, TC, and UHAST testing-suitable for engine control units. |
| Selectably Efficient Light-Load Modes | Burst Mode achieves <15µA system IQ; Pulse-Skipping maintains fixed frequency; Continuous avoids audio-band ripple. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/5V rails for head unit processors, display controllers, and CAN transceivers in vehicles with 9V–16V nominal battery and cold-crank dips to 4.5V. IC Role / Device Role: Primary synchronous buck controller regulating main system rails with spread spectrum EMI suppression and AEC-Q100 reliability. Use Value: 12µA no-load IQ extends standby time; 150°C rating allows placement near heat-generating SoCs; 40V max input withstands load dump transients. | Use Scenario: Generating isolated 12V/24V auxiliary supplies in programmable logic controllers operating in factory environments with 24VDC bus and wide ambient temperature swings. IC Role / Device Role: High-efficiency, wide-input controller for non-isolated intermediate rails feeding isolated DC/DC converters and sensor interfaces. Use Value: Programmable 100kHz–3MHz frequency avoids sensitive bands; RSENSE/DCR flexibility simplifies current monitoring; EXTVCC option improves overall system efficiency. |
| Military Vehicle Communications | Telecom Base Station PSU |
Use Scenario: Regulating 5V/12V rails for RF front-end modules and digital signal processors in armored vehicle radios exposed to shock, vibration, and extended temperature ranges. IC Role / Device Role: Robust, high-reliability buck controller with 100% duty cycle capability for brownout resilience and low-noise operation. Use Value: 150°C junction rating eliminates derating in sealed enclosures; spread spectrum meets MIL-STD-461G RE102; exposed pad enhances thermal margin. | Use Scenario: Providing tightly regulated 3.3V/5V bias for FPGA configuration, memory, and SerDes in 48V telecom rectifier systems with strict EMI limits. IC Role / Device Role: Secondary-stage synchronous controller delivering high-current, low-noise outputs with phase-locking to system clock. Use Value: PLLIN synchronization enables coherent switching across multiple rails; 3MHz max frequency supports ultra-small inductors; OPTI-LOOP ensures stability with polymer capacitors. |
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#TRPBF | Higher 5MHz max frequency, integrated MOSFET drivers with lower RDS(on), no spread spectrum. | Targeted at higher-density, higher-frequency designs where EMI is managed externally. | Choose LTC7804JUD#TRPBF when 3MHz is insufficient and spread spectrum is not required. |
| MP2918GL-Z | Monolithic 40V buck converter (integrated FETs), 12µA IQ, but only 2.2MHz max frequency and no AEC-Q100 grade. | Used in cost-sensitive, space-constrained applications where external FETs are undesirable. | Choose MP2918GL-Z only for non-automotive applications needing integration over qualification. |
Compared with LTC7804JUD#TRPBF and MP2918GL-Z, the LTC7803JUD#TRPBF uniquely balances AEC-Q100 Grade 1 qualification, 3MHz programmability, spread spectrum EMI reduction, and 100% duty cycle-making it optimal for automotive and harsh-environment synchronous buck designs requiring both reliability and noise control.
Availability
LTC7803JUD#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, military communications, and telecom base station power supplies requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for LTC7803JUD#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LTC7803JUD#TRPBF belongs to the Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding automotive and industrial applications requiring wide input range, ultra-low quiescent current, and robust EMI performance.
FAQ
What is the maximum junction temperature rating for the LTC7803JUD#TRPBF?
The LTC7803JUD#TRPBF is rated for a maximum junction temperature of 150°C and is qualified per AEC-Q100 Grade 1. This specification is guaranteed over the full –40°C to +150°C operating junction temperature range, enabling reliable operation in under-hood automotive environments and high-ambient industrial settings without thermal derating.
Does the LTC7803JUD#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803JUD#TRPBF supports true 100% duty cycle operation via its PassThru™ feature. When VIN approaches VOUT, an internal charge pump sustains gate drive for the top N-MOSFET even when BOOST–SW voltage drops below typical bootstrap thresholds-enabling continuous conduction without dropout, critical for cold-crank and brownout resilience in automotive systems.
How does spread spectrum operation reduce EMI in the LTC7803JUD#TRPBF?
The LTC7803JUD#TRPBF reduces peak radiated and conducted EMI by modulating its switching frequency ±10% around the programmed center frequency when PLLIN/SPREAD is tied to INTVCC. This dithering spreads energy across a wider bandwidth, lowering spectral peaks that dominate EMI compliance tests such as CISPR 25 Class 5-without requiring additional filtering components.
Can the LTC7803JUD#TRPBF be synchronized to an external clock, and what are the requirements?
Yes, the LTC7803JUD#TRPBF can be synchronized using the PLLIN/SPREAD pin. An external clock signal (0.1MHz–3MHz) applied to this pin locks the rising edge of the TG signal to the rising edge of the input clock. The input must meet TTL-compatible thresholds (≥2.2V high, ≤0.5V low) and be free of excessive jitter to maintain stable phase alignment across temperature and load.
What is the purpose of the EXTVCC pin on the LTC7803JUD#TRPBF, and how does it affect efficiency?
The EXTVCC pin on the LTC7803JUD#TRPBF allows sourcing INTVCC power from an external rail ≥4.7V, bypassing the internal VIN-based LDO. This reduces total input supply current by shifting bias power away from the main input-improving overall system efficiency, especially when a clean, efficient secondary rail (e.g., 5V or 12V) is available for controller biasing.
LTC7803JUD#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)
LTC7803JUD#TRPBF FAQ
1.How can I place an order for LTC7803JUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803JUD#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 LTC7803JUD#TRPBF reliable?
The price and inventory of LTC7803JUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803JUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803JUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803JUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803JUD#TRPBF?
LTC7803JUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803JUD#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 LTC7803JUD#TRPBF?
For technical support, including LTC7803JUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803JUD#TRPBF requirements.
6.How does Aetrix verify that LTC7803JUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803JUD#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 LTC7803JUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803JUD#TRPBF?
All LTC7803JUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803JUD#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 LTC7803JUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7803JUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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