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Analog Devices Inc. LTC7803EMSE#PBF
- Part No.:
- LTC7803EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7803EMSE#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:376
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Product details
Overview
LTC7803EMSE#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 achieves 12µA no-load quiescent current - enabling long runtime in battery-powered automotive and industrial systems.
For engineers reviewing the LTC7803EMSE#PBF datasheet, LTC7803EMSE#PBF pinout, LTC7803EMSE#PBF application, or LTC7803EMSE#PBF equivalent, key selection considerations include spread spectrum EMI reduction, OPTI-LOOP compensation for wide output capacitance tolerance, and selectable light-load modes (Burst, pulse-skipping, or forced continuous) across its 100kHz–3MHz programmable frequency range.
Technical Context
The LTC7803EMSE#PBF implements a constant-frequency peak current mode architecture with phase-lockable switching up to 3MHz. Its dual-mode gate drivers support 100% duty cycle operation via internal charge pump, enabling dropout-free regulation even when VIN approaches VOUT.
It integrates an RSENSE/DCR-selectable current sensing interface, a 0.792V–0.808V precision feedback reference (±1% over temperature), and independent INTVCC/EXTVCC LDOs - allowing efficient biasing from either VIN or an external 4.7V–30V supply to reduce system power loss.
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 battery life in always-on telematics and sensor nodes. |
| Switching Frequency Range | 100kHz to 3MHz (programmable via resistor or PLL-sync) - enables compact magnetics and noise-sensitive RF co-location. |
| Feedback Reference Voltage | 0.792V to 0.808V (±1%) - ensures tight output regulation across –40°C to 125°C junction temperature. |
| Current Sense Threshold | 45mV to 55mV max - supports low-loss, high-accuracy RSENSE or DCR sensing with minimal PCB footprint. |
| Spread Spectrum Enable | ±20% frequency dithering - reduces peak conducted/radiated EMI by >10dB, easing CISPR 25 Class 5 compliance. |
| Shutdown Current | 1.2µA - meets ultra-low-power system wake-up and safety shutdown requirements. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), thermally enhanced with exposed GND pad (Pin 17). Pin count and layout match industry-standard MSOP footprint for drop-in compatibility with existing layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TRACK/SS (Pin 1) | Soft-start & tracking control | Internal 12.5µA pull-up charges external capacitor for linear VOUT ramp; enables voltage tracking of auxiliary rails during startup. |
| SENSE+ / SENSE– (Pins 2, 3) | Differential current sense inputs | Supports RSENSE or DCR sensing; SENSE– ≥3.2V supplies sleep-mode current to reduce VIN-referred IQ. |
| VFB (Pin 4) | Error amplifier feedback input | Regulates output to 0.8V reference; connects to resistor divider from VOUT - sets precise output voltage with ±1% accuracy. |
| ITH (Pin 5) | Error amplifier output & compensation node | Controls peak inductor current; external RC network here sets loop bandwidth and transient response per OPTI-LOOP. |
| RUN (Pin 6) | Enable/shutdown control | 1.2V threshold enables operation; <0.7V forces full shutdown (1.2µA IQ); supports UVLO implementation with external divider. |
| FREQ (Pin 7) | VCO frequency programming | GND = 375kHz, INTVCC = 2.25MHz; resistor-to-GND sets 100kHz–3MHz - enables EMI optimization and thermal management. |
| PLLIN/SPREAD (Pin 8) | Sync input / spread spectrum select | External clock sync (0.1–3MHz) or INTVCC = spread spectrum dithering; eliminates beat frequencies in multi-rail systems. |
| MODE (Pin 9) | Light-load operation mode select | GND = Burst Mode (lowest IQ), floating = Burst (internal 100k pull-down), INTVCC = forced continuous, 100k-to-INTVCC = pulse-skipping. |
| INTVCC (Pin 10) | Internal 5.15V LDO output | Powers gate drivers and analog circuitry; requires ≥4.7µF ceramic decoupling - critical for stable high-frequency switching. |
| EXTVCC (Pin 11) | External bias input for INTVCC LDO | Enables bypass of VIN-based LDO when ≥4.7V applied - improves efficiency in systems with clean intermediate rail. |
| VIN (Pin 12) | Main input supply | Bias source for internal circuits when EXTVCC unused; requires local ceramic bypass to GND for noise immunity. |
| BG (Pin 13) | Bottom N-MOSFET gate driver | Drives synchronous rectifier with 1.5Ω pull-down / 3Ω pull-up - minimizes conduction loss and reverse recovery stress. |
| BOOST (Pin 14) | Bootstrap supply for top driver | Connects to SW via capacitor and Schottky diode; internal charge pump sustains 100% duty cycle during dropout. |
| TG (Pin 15) | Top N-MOSFET gate driver | Floating driver with INTVCC swing superimposed on SW node - enables high-side N-FET use without external bootstrap complexity. |
| SW (Pin 16) | Switch node connection | Direct connection to inductor and BOOST capacitor; high dv/dt node requiring tight layout and ground plane isolation. |
| GND (Pin 17) | Power and signal ground | Exposed thermal pad must be soldered to PCB ground plane - provides θJA = 40°C/W and reliable 125°C operation. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Capability | Internal charge pump sustains TG drive during VIN ≈ VOUT dropout - eliminates need for external LDO or buck-boost stage in wide-input applications. |
| Spread Spectrum Modulation | ±20% frequency dithering reduces peak EMI amplitude without altering average switching frequency - simplifies EMI filter design and certification. |
| OPTI-LOOP Compensation | Single-pole compensation via ITH pin accommodates wide range of output capacitor ESR and capacitance values - eliminates iterative loop tuning across designs. |
| Selectably Optimized Light-Load Efficiency | Three distinct modes (Burst, pulse-skipping, forced continuous) allow trade-off between IQ, output ripple, and transient response - matched to specific system sleep/wake profiles. |
| AEC-Q100 Qualified (Grade E) | Rated for –40°C to +125°C junction temperature with production-tested reliability - qualified for under-hood automotive power modules and ADAS ECUs. |
| Low-IQ INTVCC/EXTVCC Dual-LDO Architecture | Allows system-level power architecture flexibility: derive INTVCC from VIN (low-noise) or EXTVCC (high-efficiency), reducing total system quiescent loss. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module Regulator |
|---|---|
|
Use Scenario: Powering 3.3V/20A SoC and memory subsystems in head-unit systems with 9V–16V battery input and strict CISPR 25 EMI limits. IC Role / Device Role / Timing Role: Primary synchronous step-down controller managing high-current DC/DC conversion with spread spectrum and 100% duty cycle for cold-crank resilience. Use Value: 12µA no-load IQ extends standby time; ±20% spread spectrum meets Class 5 radiated emissions without added filtering cost. |
Use Scenario: Generating isolated 5V/12V rails for digital I/O and analog sensor interfaces in DIN-rail mounted controllers operating from 24VDC industrial bus. IC Role / Device Role / Timing Role: High-voltage input controller supporting 40V transients and delivering stable output despite wide load variation and ambient temperature swings. Use Value: 4.5V–40V input range handles brownouts and surges; AEC-Q100 qualification ensures reliability in harsh factory environments. |
| Military Vehicle DC-DC Conversion | Telecom Remote Radio Unit (RRU) Bias |
|
Use Scenario: Converting 28V aircraft bus to 12V/15A for avionics displays and comms modules requiring MIL-STD-461E conducted EMI compliance. IC Role / Device Role / Timing Role: EMI-optimized controller with programmable 100kHz–3MHz frequency and phase-lock capability for synchronized multi-rail noise cancellation. Use Value: PLLIN synchronization enables coordinated switching across multiple converters - suppressing beat frequencies and harmonic stacking. |
Use Scenario: Providing 5V/10A bias to GaN PA stages in outdoor 5G RRUs powered from -48V telecom rectifiers with high ambient temperatures. IC Role / Device Role / Timing Role: High-efficiency, high-temperature controller using EXTVCC to bypass VIN LDO and reduce thermal load on main supply path. Use Value: EXTVCC operation lowers total power dissipation; 125°C rated junction temperature supports uncooled outdoor enclosure deployment. |
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 (Monolithic Power) | Integrated 60V/5A power stage; fixed 500kHz frequency; no spread spectrum or PLL sync. | Lower BOM count for ≤5A designs; lacks EMI flexibility and wide-frequency tuning needed for high-density telecom systems. | Choose MP2918GQ-Z only for space-constrained, medium-current applications where integrated FETs simplify layout and EMI is managed externally. |
| LM5145QPWPRQ1 (TI) | 45V max input; 1.5MHz max frequency; no spread spectrum; supports DCR sensing only. | Qualified for automotive but lacks AEC-Q100 Grade E extended temp; lower max frequency limits magnetics size reduction. | Choose LM5145QPWPRQ1 if system requires TI's WEBENCH support and 45V input suffices - but verify EMI margin without spread spectrum. |
Compared with MP2918GQ-Z and LM5145QPWPRQ1, the LTC7803EMSE#PBF uniquely combines 40V input, 3MHz programmability, ±20% spread spectrum, and 100% duty cycle - making it optimal for high-reliability, EMI-sensitive, wide-input applications where discrete FET control and thermal headroom are critical.
Availability
LTC7803EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, military vehicle electronics, and telecom RRU power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC7803EMSE#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 power management ICs, serving industrial, automotive, communications, and defense markets with precision, reliability, and innovation.
The LTC7803 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-voltage, low-quiescent-current DC/DC conversion in demanding automotive and industrial environments.
FAQ
What is the maximum input voltage rating for the LTC7803EMSE#PBF?
The LTC7803EMSE#PBF has an absolute maximum input voltage rating of 40V on the VIN pin. Its operational input range is specified from 4.5V to 40V, making it suitable for 24V and 36V industrial and automotive systems including cold-crank and load-dump conditions. Exceeding 40V may cause permanent damage.
Does the LTC7803EMSE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803EMSE#PBF supports true 100% duty cycle operation via an internal charge pump that sustains gate drive to the top N-MOSFET even when VIN drops near VOUT. This eliminates dropout and avoids the need for external LDOs or secondary regulators in wide-input applications such as automotive battery systems.
How does spread spectrum operation reduce EMI in the LTC7803EMSE#PBF?
The LTC7803EMSE#PBF implements spread spectrum by dithering its switching frequency ±20% around the programmed center frequency when PLLIN/SPREAD is tied to INTVCC. This spreads energy across a wider bandwidth, reducing peak conducted and radiated emissions by >10dB - directly easing compliance with CISPR 25 and FCC Part 15 standards.
What are the three light-load operating modes of the LTC7803EMSE#PBF, and how are they selected?
The LTC7803EMSE#PBF offers Burst Mode (lowest IQ), pulse-skipping, and forced continuous conduction modes. Selection is made via the MODE pin: GND or floating = Burst Mode; INTVCC through 100kΩ = pulse-skipping; direct INTVCC = forced continuous. Each mode optimizes efficiency, ripple, or transient response for specific system sleep/wake behavior.
Is the LTC7803EMSE#PBF qualified for automotive applications, and what grade does it meet?
Yes, the LTC7803EMSE#PBF is AEC-Q100 qualified for automotive applications. It is rated for a junction temperature range of –40°C to +125°C (Grade E), with production-tested reliability and failure mechanisms analysis per AEC-Q100 Rev H. It is suitable for under-hood and cabin ECUs including infotainment, ADAS, and body control modules.
LTC7803EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC7803EMSE#PBF FAQ
1.How can I place an order for LTC7803EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803EMSE#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 LTC7803EMSE#PBF reliable?
The price and inventory of LTC7803EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7803EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803EMSE#PBF?
LTC7803EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803EMSE#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 LTC7803EMSE#PBF?
For technical support, including LTC7803EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803EMSE#PBF requirements.
6.How does Aetrix verify that LTC7803EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7803EMSE#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 LTC7803EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7803EMSE#PBF?
All LTC7803EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803EMSE#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 LTC7803EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7803EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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