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Analog Devices Inc. LTC7803JMSE#TRPBF
- Part No.:
- LTC7803JMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7803JMSE#TRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
LTC7803JMSE#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, achieves 12µA no-load quiescent current, and supports spread spectrum operation for EMI reduction - used in automotive power supplies requiring high efficiency and low noise.
For engineers reviewing the LTC7803JMSE#TRPBF datasheet, LTC7803JMSE#TRPBF pinout, LTC7803JMSE#TRPBF application, or LTC7803JMSE#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 150°C junction temperature rating, MSOP-16 package with exposed pad, and support for RSENSE/DCR current sensing in high-reliability 12V–36V automotive and industrial power conversion designs.
Technical Context
The LTC7803JMSE#TRPBF implements a constant-frequency peak current mode control architecture with programmable switching frequency (100kHz–3MHz) and phase-lockable capability via PLLIN/SPREAD. Its OPTI-LOOP compensation enables stable loop response across wide output capacitance and ESR ranges.
It integrates dual gate drivers (TG/BG) with 1.5Ω pull-down and 3Ω pull-up on-resistance, supports PassThru™ 100% duty cycle operation during dropout, and features independent INTVCC/EXTVCC LDOs enabling efficient biasing from either VIN or an external 4.7–30V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range automotive battery inputs including cold-crank and load-dump conditions. |
| No-Load Quiescent Current | 12µA at 14VIN/3.3VOUT - extends runtime in always-on vehicle modules like telematics and ADAS sensors. |
| Switching Frequency | Programmable 100kHz–3MHz or phase-locked - enables compact magnetics and noise shaping for EMI compliance. |
| Output Voltage Range | 0.8V to 40V - configurable for diverse rail requirements including 3.3V, 5V, 12V, and high-side 24V/36V systems. |
| Current Sensing | RSENSE or DCR - flexible integration with discrete shunts or inductor DCR for cost-optimized or lossless sensing. |
| Junction Temperature | –40°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive environments. |
| Package | 16-pin MSOP with exposed thermal pad - provides 10°C/W θJC for reliable thermal management in space-constrained layouts. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE), 3mm × 4.9mm, exposed pad (Pin 17 = GND). Requires soldering of exposed pad to PCB for thermal performance (θJA = 40°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 / 3 | TRACK/SS | Soft-start ramp generator and external voltage tracking input - internal 12.5µA pull-up enables linear VOUT ramp via external capacitor; supports supply sequencing. |
| 2 / 4 | SENSE+ | Positive input to differential current comparator - used with SENSE– to set peak current limit based on ITH voltage and sense resistor or DCR. |
| 3 / 5 | SENSE– | Negative input to differential current comparator - supplies sleep-mode quiescent current when ≥3.2V, reducing input-referred IQ in light-load operation. |
| 4 / 6 | VFB | Error amplifier feedback node - regulates output to 0.792–0.808V reference; connects to resistor divider for precise VOUT setting. |
| 5 / 7 | ITH | Error amplifier output and compensation point - controls current limit threshold; external RC network sets loop stability. |
| 6 / 8 | RUN | Enable/shutdown control - <1.15V disables regulation; <0.7V shuts down IC, reducing IQ to 1.2µA. |
| 7 / 9 | FREQ | VCO frequency programming - grounded = 375kHz, tied to INTVCC = 2.25MHz, resistor-to-GND enables 100kHz–3MHz tuning. |
| 8 / 10 | PLLIN/SPREAD | External sync input or spread spectrum enable - external clock locks TG edge; tied to INTVCC enables dithering for EMI reduction. |
| 9 / 11 | MODE | Light-load operation mode select - GND = Burst Mode, INTVCC = forced continuous, 100kΩ-to-INTVCC = pulse-skipping. |
| 10 / 12 | INTVCC | 5.15V internal LDO output - powers gate drivers and control logic; requires ≥4.7µF ceramic decoupling to GND. |
| 11 / 13 | EXTVCC | External bias input for INTVCC LDO - bypasses VIN LDO when >4.7V, improving system efficiency in multi-rail designs. |
| 12 / 14 | VIN | Main input supply - powers internal circuitry when EXTVCC is inactive; requires local ceramic bypass capacitor. |
| 13 / 15 | BG | Bottom N-MOSFET gate driver - swings from GND to INTVCC; drives synchronous rectifier with 1.5Ω pull-down resistance. |
| 14 / 16 | BOOST | Bootstrap supply for top gate driver - connected via capacitor to SW and Schottky diode to INTVCC for floating high-side drive. |
| 15 / 1 | TG | Top N-MOSFET gate driver - floating output with INTVCC swing superimposed on SW node; supports 100% duty cycle via internal charge pump. |
| 16 / 2 | SW | Switch node connection - ties to inductor and BOOST capacitor; critical for layout to minimize EMI and switching losses. |
| 17 | GND | Power and signal ground - exposed pad must be soldered to PCB thermal plane; serves as return for CIN, COUT, and small-signal references. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak conducted/radiated EMI by dithering switching frequency ±10% around fOSC, easing CISPR 25 Class 5 compliance without added filtering. |
| OPTI-LOOP Compensation | Enables single-pole compensation over wide output capacitor ESR range (0.5mΩ–100mΩ), eliminating need for complex Type II/III networks. |
| PassThru™ 100% Duty Cycle | Maintains regulation during input dropout (e.g., 6VIN → 3.3VOUT) using internal charge pump, avoiding unregulated pass-through failure modes. |
| AEC-Q100 Qualified | Qualified to Grade 1 (–40°C to +150°C) with full reliability testing - meets automotive functional safety requirements for power management in ADAS and infotainment. |
| Selectably Efficient Light-Load Modes | Burst Mode (14µA IQ), pulse-skipping, or forced continuous - allows trade-off between light-load efficiency, output ripple, and EMI profile per system requirement. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V-to-12V/5V Conversion |
|---|---|
Use Scenario: Powering head unit SoCs, display controllers, and audio amplifiers from 12V/24V vehicle battery with strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous step-down controller managing high-current 5V/3.3V rails with spread spectrum and soft-start sequencing. Use Value: 12µA quiescent current prevents battery drain during ignition-off; AEC-Q100 qualification ensures reliability in under-dash thermal environments. |
Use Scenario: Converting 24V factory bus to isolated 12V/5V rails for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-efficiency buck controller supporting wide input transients (up to 40V) and operating continuously at 60°C ambient. Use Value: 150°C junction rating and MSOP thermal pad enable operation without heatsink; RSENSE/DCR flexibility reduces BOM cost vs. integrated solutions. |
| Avionics DC-DC Converter | Telecom Base Station Bias Supply |
Use Scenario: Generating regulated 3.3V/5V from 28V aircraft bus for flight control computers and navigation sensors. IC Role / Device Role / Timing Role: Radiation-tolerant (by design), high-reliability controller with 100% duty cycle for brownout resilience. Use Value: Low shutdown IQ (1.2µA) preserves backup battery life; phase-lockable frequency enables synchronization with master clock to avoid beat frequencies. |
Use Scenario: Providing clean, low-noise 3.3V bias for RF front-end ICs and FPGAs in 48V-powered telecom equipment. IC Role / Device Role / Timing Role: EMI-optimized controller with spread spectrum and programmable frequency to meet FCC Part 15B radiated emissions limits. Use Value: 3MHz max switching enables ultra-small inductors (<1µH); 0.8V feedback reference improves accuracy across temperature vs. typical 1.25V references. |
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 |
|---|---|---|---|
| MP2918GQ-Z | Lower max input (30V), no spread spectrum, 25µA IQ, QFN-20 package | Targeted at cost-sensitive industrial SMPS; lacks AEC-Q100 and automotive thermal rating | Choose MP2918GQ-Z only if input ≤30V, EMI requirements are relaxed, and 150°C operation is unnecessary. |
| LM5145QPWPRQ1 | 45V max input, 15µA IQ, no spread spectrum, 16-pin HTSSOP, no PLL sync | Automotive-qualified but limited to 125°C junction; lacks frequency dithering for stringent EMI environments | Choose LM5145QPWPRQ1 where higher input voltage margin is needed but spread spectrum is not required for EMI certification. |
Compared with MP2918GQ-Z and LM5145QPWPRQ1, the LTC7803JMSE#TRPBF uniquely combines AEC-Q100 Grade 1 qualification, 150°C operation, spread spectrum, and phase-lockable frequency - making it the only option for high-reliability automotive and avionics applications demanding both thermal robustness and EMI compliance.
Availability
LTC7803JMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V power systems, avionics DC-DC converters, and telecom base station bias supplies requiring stable component supply and long-term production continuity.
Supply support for LTC7803JMSE#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 precision instrumentation, communications, and automotive markets since 1965.
The LTC7803JMSE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI, wide-input synchronous buck conversion in automotive, industrial, and aerospace applications.
FAQ
What is the maximum junction temperature rating for the LTC7803JMSE#TRPBF?
The LTC7803JMSE#TRPBF is rated for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified to Grade 1. This specification is confirmed in the Order Information table and Absolute Maximum Ratings section of the official datasheet Rev. B, making it suitable for under-hood automotive use cases where ambient temperatures exceed 105°C.
Does the LTC7803JMSE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803JMSE#TRPBF supports true 100% duty cycle operation via its PassThru™ feature. When input voltage approaches output voltage, an internal charge pump sustains BOOST voltage to keep the top MOSFET fully enhanced - verified in the Functional Diagram and Applications Information sections. This avoids unregulated dropout common in non-charge-pump controllers.
How does spread spectrum operation reduce EMI in the LTC7803JMSE#TRPBF?
The LTC7803JMSE#TRPBF 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 bandwidth instead of concentrating it at harmonics - directly stated in the FEATURES and Spread Spectrum Oscillator sections of the datasheet, enabling easier CISPR 25 compliance.
Can the LTC7803JMSE#TRPBF be synchronized to an external clock, and what pins are involved?
Yes, the LTC7803JMSE#TRPBF supports external synchronization via the PLLIN/SPREAD pin. When an external clock is applied, the internal PLL forces the rising edge of the TG signal to align with the clock's rising edge. The FREQ pin remains active for frequency programming, and MODE determines light-load behavior during sync - all confirmed in the PIN FUNCTIONS and ELECTRICAL CHARACTERISTICS tables.
What is the purpose of the SENSE– pin in the LTC7803JMSE#TRPBF, beyond current sensing?
In addition to its role as the negative input to the current comparator, the SENSE– pin supplies sleep-mode quiescent current when its voltage reaches ≥3.2V - reducing input-referred IQ by the ratio (VOUT/VIN) × efficiency. This is explicitly documented in the Electrical Characteristics table (ISENSE– row) and OPERATION section, enabling ultra-low-power operation in battery-backed systems.
LTC7803JMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC7803JMSE#TRPBF FAQ
1.How can I place an order for LTC7803JMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803JMSE#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 LTC7803JMSE#TRPBF reliable?
The price and inventory of LTC7803JMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803JMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803JMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803JMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803JMSE#TRPBF?
LTC7803JMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803JMSE#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 LTC7803JMSE#TRPBF?
For technical support, including LTC7803JMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803JMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7803JMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803JMSE#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 LTC7803JMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803JMSE#TRPBF?
All LTC7803JMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803JMSE#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 LTC7803JMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7803JMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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