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Analog Devices Inc. LTC7803EMSE#TRPBF
- Part No.:
- LTC7803EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7803EMSE#TRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:1,164
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Product details
Overview
LTC7803EMSE#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 - used in automotive power supplies requiring high efficiency and low noise.
For engineers reviewing the LTC7803EMSE#TRPBF datasheet, LTC7803EMSE#TRPBF pinout, LTC7803EMSE#TRPBF application, or LTC7803EMSE#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 reliability.
Technical Context
The LTC7803EMSE#TRPBF implements a constant-frequency peak current mode control architecture with phase-lockable oscillator (100kHz–3MHz), enabling precise timing synchronization and jitter-controlled switching. Its dual-mode gate drivers support 100% duty cycle operation via internal charge pump, and it features independent INTVCC/EXTVCC LDOs for flexible biasing.
It integrates spread spectrum dithering on the oscillator to reduce conducted/ radiated EMI peaks, while OPTI-LOOP compensation allows stable loop response across wide output capacitance and ESR ranges. Light-load behavior is configurable via MODE pin: Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-range industrial and automotive battery inputs including 12V, 24V, and 36V systems. |
| No-Load Quiescent Current | 12µA at 14VIN → 3.3VOUT - extends runtime in always-on battery-powered modules. |
| Switching Frequency | Programmable 100kHz–3MHz (via FREQ pin resistor) - enables compact magnetics and noise shaping for EMI compliance. |
| Feedback Reference Voltage | 0.792V to 0.808V (typ. 0.800V) - sets accurate output regulation with ±1% tolerance over temperature. |
| Current Sense Threshold | 45mV to 55mV (typ. 50mV) - supports low-loss RSENSE or DCR sensing with minimal power loss. |
| Shutdown Current | 1.2µA - ensures ultra-low leakage during system sleep or standby states. |
| Output Voltage Range | 0.8V to 40V - enables buck configurations from low-voltage logic rails to high-voltage auxiliary supplies. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), thermally enhanced with exposed GND pad (Pin 17) requiring PCB soldering for thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TRACK/SS (Pin 1) | Soft-start & tracking input | Internal 12.5µA pull-up charges external capacitor for linear VOUT ramp; enables supply tracking during startup. |
| SENSE+ / SENSE− (Pins 2, 3) | Differential current sense inputs | Measure voltage across RSENSE or inductor DCR to set peak current limit; SENSE− also sources sleep-mode current. |
| VFB (Pin 4) | Error amplifier feedback input | Compares output divider voltage to 0.8V reference; determines regulated output voltage accuracy and stability. |
| ITH (Pin 5) | Error amplifier output & compensation node | Controls current comparator threshold; connects to RC network for OPTI-LOOP compensation tuning. |
| RUN (Pin 6) | Enable/shutdown control | 1.2V rising threshold enables operation; <0.7V forces shutdown (1.2µA IQ); supports UVLO implementation. |
| FREQ (Pin 7) | VCO frequency programming | GND = 375kHz, INTVCC = 2.25MHz; resistor-to-GND sets 100kHz–3MHz - enables EMI optimization and layout flexibility. |
| PLLIN/SPREAD (Pin 8) | Synchronization & spread spectrum select | External clock input for phase-locking; tied to INTVCC enables spread spectrum dithering to reduce EMI peaks. |
| MODE (Pin 9) | Light-load operation mode select | GND = Burst Mode (12µA IQ), INTVCC = forced CCM, resistor-to-INTVCC = pulse-skipping - balances efficiency vs. ripple. |
| INTVCC (Pin 10) | Internal 5.15V LDO output | Powers gate drivers and analog circuitry; requires ≥4.7µF ceramic decoupling to GND for stability. |
| EXTVCC (Pin 11) | External bias input for INTVCC LDO | Enables high-efficiency bypass of VIN LDO when >4.7V applied - reduces total input current in multi-rail systems. |
| VIN (Pin 12) | Main input supply | Bias source for internal VIN LDO; requires local ceramic bypass capacitor to GND for noise suppression. |
| BG (Pin 13) | Bottom N-MOSFET gate driver | Drives synchronous rectifier with rail-to-rail swing (GND to INTVCC); supports high-side/lower-side FET pairing. |
| BOOST (Pin 14) | Bootstrap supply for top gate driver | Connects to SW via capacitor; Schottky diode to INTVCC enables 100% duty cycle via internal charge pump. |
| TG (Pin 15) | Top N-MOSFET gate driver | Floating driver output (SW + INTVCC swing); drives high-side FET with fast rise/fall times (25ns/15ns). |
| SW (Pin 16) | Switch node connection | Connects to inductor and BOOST capacitor; high dv/dt node requiring careful PCB layout and grounding. |
| GND (Pin 17) | Power & signal ground | Exposed thermal pad - must be soldered to PCB plane for thermal management and low-noise small-signal referencing. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak EMI by >10dB across input/output lines - simplifies compliance with CISPR 25 Class 5 and FCC Part 15. |
| PassThru™ / 100% Duty Cycle | Enables dropout-free operation down to VOUT ≈ VIN using internal charge pump - critical for automotive cold-crank scenarios. |
| OPTI-LOOP Compensation | Allows single-pole compensation across 10µF–1000µF output capacitors and wide ESR range - eliminates trial-and-error tuning. |
| AEC-Q100 Qualified (Grade E) | Rated for –40°C to +125°C junction temperature - validated for under-hood automotive applications per stress test requirements. |
| Selectably Efficient Light-Load Modes | Burst Mode (12µA IQ), pulse-skipping, or forced CCM - preserves efficiency across 100µA–20A load range without sacrificing transient response. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
|
Use Scenario: Powering 3.3V/5V logic rails in head-unit SoC subsystems with 12V/24V battery input and strict CISPR 25 EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current conversion with spread spectrum and soft-start coordination. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep; spread spectrum meets Class 5 conducted emissions without added filtering. |
Use Scenario: Generating isolated 15V auxiliary supply for analog sensor front-ends in factory automation controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: High-input-voltage step-down controller driving discrete N-FETs with RSENSE current sensing and robust UVLO. Use Value: 40V max input withstands 24V bus transients; 100% duty cycle maintains output during brownouts; AEC-Q100 grade ensures long-term reliability. |
| Military Vehicle DC-DC Conversion | Telecom Base Station Bias Supply |
|
Use Scenario: Converting 28V aircraft bus to 5V/12V for mission-critical avionics processors requiring MIL-STD-461E RE102 compliance. IC Role / Device Role / Timing Role: EMI-optimized controller with PLLIN synchronization to system clock for deterministic noise placement. Use Value: Phase-lockable 3MHz operation enables harmonic alignment with system clocks; spread spectrum further suppresses narrowband peaks. |
Use Scenario: Providing 3.3V/20A core supply for FPGA-based baseband processing units in 4G/5G remote radio heads with 48V backplane input. IC Role / Device Role / Timing Role: High-efficiency, high-current synchronous controller supporting parallel FETs and external current monitoring. Use Value: 3MHz switching enables <1µH inductors; RSENSE/DCR flexibility supports precision current limiting for fault protection. |
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, fixed 600kHz/1.2MHz options only, no PLLIN sync. | Targeted at cost-sensitive industrial SMPS; lacks automotive qualification and EMI features. | Choose MP2918GQ-Z only if input ≤30V, EMI requirements are relaxed, and AEC-Q100 is not required. |
| ISL81601FRZ-T7A | Wider input (4.5V–60V), dual-phase capable, no integrated spread spectrum, higher IQ (25µA). | Designed for high-power server/telecom PSUs; lacks automotive qualification and soft-start tracking. | Choose ISL81601FRZ-T7A for >40V input or multiphase scaling; avoid where EMI or automotive qualification is mandatory. |
Compared with MP2918GQ-Z and ISL81601FRZ-T7A, the LTC7803EMSE#TRPBF uniquely combines AEC-Q100 qualification, spread spectrum, 100% duty cycle, and sub-15µA IQ - making it the only option meeting stringent automotive EMI and cold-crank requirements in a single MSOP package.
Availability
LTC7803EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, and military vehicle DC-DC conversion requiring stable component supply, long-lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LTC7803EMSE#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 LTC7803 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI, wide-input synchronous buck conversion in demanding automotive and industrial environments.
FAQ
What is the maximum input voltage rating for the LTC7803EMSE#TRPBF?
The LTC7803EMSE#TRPBF has an absolute maximum input supply voltage (VIN) rating of 40V. Its operational input range is specified from 4.5V to 40V, making it suitable for 12V, 24V, and 36V automotive and industrial bus systems. Exceeding 40V may cause permanent damage per Absolute Maximum Ratings.
Does the LTC7803EMSE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803EMSE#TRPBF supports true 100% duty cycle operation via its internal charge pump connected to the BOOST pin. When VIN approaches VOUT, the controller activates the charge pump to maintain gate drive for the top N-MOSFET, enabling dropout-free PassThru™ operation - critical for automotive cold-crank conditions.
How does spread spectrum operation reduce EMI in the LTC7803EMSE#TRPBF?
The LTC7803EMSE#TRPBF implements frequency dithering by modulating the oscillator center frequency up to ±10% around its nominal value when PLLIN/SPREAD is tied to INTVCC. This spreads energy across a wider bandwidth, reducing peak conducted and radiated emissions by >10dB - easing compliance with CISPR 25 and FCC standards without additional filtering.
What package type and thermal characteristics apply to the LTC7803EMSE#TRPBF?
The LTC7803EMSE#TRPBF uses a 16-lead plastic MSOP package with exposed GND pad (Pin 17). Its thermal resistance is θJA = 40°C/W and θJC = 10°C/W. The exposed pad must be soldered to a PCB thermal plane to achieve rated performance and ensure reliable operation at full load within –40°C to +125°C junction temperature range.
Can the LTC7803EMSE#TRPBF be synchronized to an external clock, and what pins are involved?
Yes, the LTC7803EMSE#TRPBF supports external synchronization via the PLLIN/SPREAD pin (Pin 8). Applying a clean external clock signal (0.1MHz–3MHz) to this pin locks the rising edge of the TG signal to the external clock's rising edge. The FREQ pin remains functional for fine-tuning within the locked range.
LTC7803EMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7803EMSE#TRPBF FAQ
1.How can I place an order for LTC7803EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803EMSE#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 LTC7803EMSE#TRPBF reliable?
The price and inventory of LTC7803EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803EMSE#TRPBF?
LTC7803EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803EMSE#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 LTC7803EMSE#TRPBF?
For technical support, including LTC7803EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7803EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803EMSE#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 LTC7803EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803EMSE#TRPBF?
All LTC7803EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803EMSE#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 LTC7803EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7803EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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